ORCID Profile
0000-0001-7684-446X
Current Organisation
Monash University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Phycology | Ecology | Plant Biology | Chemical Spectroscopy | Biological And Medical Chemistry | Marine and Estuarine Ecology (incl. Marine Ichthyology) | Freshwater Ecology | Marine And Estuarine Ecology (Incl. Marine Ichthyology) | Physical Chemistry (Incl. Structural) | Analytical Chemistry | Environmental Science and Management | Plant Physiology | Ecosystem Function | Plant Physiology | Geochemistry | Analytical Spectrometry | Nanochemistry and Supramolecular Chemistry | Environmental Management And Rehabilitation | Instruments And Techniques | Other Chemical Sciences | Genomics | Analytical Biochemistry | Nanotechnology | Environmental Chemistry (incl. Atmospheric Chemistry) | Environmental Management | Conservation and Biodiversity | Microbial Ecology | Microbial Systematics, Taxonomy And Phylogeny | Fermentation, Biotechnology And Industrial Microbiology | Geochemistry not elsewhere classified | Freshwater Ecology | Analytical Spectrometry | Bioinorganic Chemistry | Ecological Applications | Global Change Biology | Biotechnology Not Elsewhere Classified | Biological Oceanography | Nanoscale Characterisation | Aquaculture | Organic Geochemistry | Isotope Geochemistry | Global Change Biology | Phycology (incl. Marine Grasses) | Other Physical Sciences | Ecological Impacts of Climate Change | Nanobiotechnology |
ANZSRC Socio-Economic Objective (SEO)
Climate change | Biological sciences | Chemical sciences | Treatments (e.g. chemicals, antibiotics) | Land and water management | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Coastal and Estuarine Land Management | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Diagnostic methods | Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity | Coastal and Estuarine Flora, Fauna and Biodiversity | Land and water management | Human Diagnostics | Integrated (ecosystem) assessment and management | Estuarine and lagoon areas | Earth sciences | Environmental and resource evaluation not elsewhere classified | Living resources (incl. impacts of fishing on non-target species) | Ceramics, glass and industrial mineral products not elsewhere classified | Physical and Chemical Conditions of Water in Marine Environments | Integrated (ecosystem) assessment and management | Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use) | Other | Renewable energy not elsewhere classified (e.g. geothermal) | Aquaculture | Diagnostics | Other | Integrated (ecosystem) assessment and management | Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments | Industrial instrumentation | Scientific instrumentation | Living resources (flora and fauna) | Land and water management | Expanding Knowledge in the Earth Sciences | Water services and utilities | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Biological Sciences | Food safety | Coastal and Estuarine Water Management
Related Links
Publications
The potential effects of global climate change on microalgal photosynthesis, growth and ecology
Publisher: Informa UK Limited
Date: 2004
AFestschriftin honour of Professor John A. Raven
Publisher: Informa UK Limited
Date: 15-12-2009
Exposure times in rapid light curves affect photosynthetic parameters in algae
Publisher: Elsevier BV
Date: 10-2010
Blooms of cyanobacteria in a temperate Australian lagoon system post and prior to European settlement
Publisher: Copernicus GmbH
Date: 25-11-2015
DOI: 10.5194/BGD-12-18829-2015
Abstract: Abstract. Blooms of noxious N2 fixing cyanobacteria such as Nodularia spumigena are a recurring problem in some estuaries. Here we report the results of a palaeoecological study on a temperate Australian lagoon system (The Gippsland Lakes) where we used stable isotopes and pigment biomarkers in dated cores as proxies for eutrophication and blooms of cyanobacteria. Pigment proxies show a clear signal, with an increase in cyanobacterial pigments (echinenone, canthaxanthin and zeaxanthin) in the period coinciding with recent blooms. Another excursion in these proxies was observed prior to the opening of an artificial entrance to the lakes in 1889, which markedly increased the salinity of the Gippsland Lakes. A coincident increase in the sediment organic carbon content in the period prior to the opening of the artificial entrance suggests the bottom waters of the lakes were increasingly stratified and hypoxic, which would have led to an increase in the recycling of phosphorus. After the opening of the artificial entrance there was a ~ 60 year period with low values for the cyanobacterial proxies as well as a low sediment organic carbon content suggesting a period of low bloom activity associated with the increased salinity of the lakes. During the 1940s, the current period of re-eutrophication commenced as indicated by a steadily increasing sediment organic carbon content and cyanobacterial pigments. We suggest increasing nitrogen inputs from the catchment led to the return of hypoxia and increased phosphorus release from the sediment, which drove the re-emergence of cyanobacterial blooms.
Fatty acids of six Codium species from southeast Australia
Publisher: Elsevier BV
Date: 08-1998
Assessment of the nutrient status of phytoplankton: A comparison between conventional bioassays and nutrient-induced fluorescence transients (NIFTs)
Publisher: Elsevier BV
Date: 09-2004
Impacts of phosphorus availability on lipid production by Chlamydomonas reinhardtii
Publisher: Elsevier BV
Date: 11-2015
FTIR combined with chemometric tools — a potential approach for early screening of grazers in microalgal cultures
Publisher: Springer Science and Business Media LLC
Date: 30-06-2021
Photosynthesis in a marine diatom
Publisher: Springer Science and Business Media LLC
Date: 07-2001
DOI: 10.1038/35083694
Borohydride‐Scaffolded Li/Na/Mg Fast Ionic Conductors for Promising Solid‐State Electrolytes
Publisher: Wiley
Date: 10-10-2018
Abstract: Borohydride solid-state electrolytes with room-temperature ionic conductivity up to ≈70 mS cm
Photosynthetic response and DNA mutation of tropical, temperate and polar Chlorella under short-term UVR stress
Publisher: Elsevier BV
Date: 06-2019
Study on the dehydrogenation kinetics and thermodynamics of Ca(BH4)2
Publisher: Elsevier BV
Date: 06-2010
Blooms of cyanobacteria in a temperate Australian lagoon system post and prior to European settlement
Publisher: Copernicus GmbH
Date: 22-06-2016
Abstract: Abstract. Blooms of noxious N2 fixing cyanobacteria such as Nodularia spumigena are a recurring problem in some estuaries however, the historic occurrence of such blooms in unclear in many cases. Here we report the results of a palaeoecological study on a temperate Australian lagoon system (the Gippsland Lakes) where we used stable isotopes and pigment biomarkers in dated cores as proxies for eutrophication and blooms of cyanobacteria. Pigment proxies show a clear signal, with an increase in cyanobacterial pigments (echinenone, canthaxanthin and zeaxanthin) in the period coinciding with recent blooms. Another excursion in these proxies was observed prior to the opening of an artificial entrance to the lakes in 1889, which markedly increased the salinity of the Gippsland Lakes. A coincident increase in the sediment organic-carbon content in the period prior to the opening of the artificial entrance suggests that the bottom waters of the lakes were more stratified and hypoxic, which would have led to an increase in the recycling of phosphorus. After the opening of the artificial entrance, there was a ∼ 60-year period with low values for the cyanobacterial proxies as well as a low sediment organic-carbon content suggesting a period of low bloom activity associated with the increased salinity of the lakes. During the 1940s, the current period of re-eutrophication commenced, as indicated by a steadily increasing sediment organic-carbon content and cyanobacterial pigments. We suggest that increasing nitrogen inputs from the catchment led to the return of hypoxia and increased phosphorus release from the sediment, which drove the re-emergence of cyanobacterial blooms.
A Wide Temperature 10 V Solid-state Electrolyte with a Critical Current Density of over 20 mA cm-2
Publisher: Research Square Platform LLC
Date: 09-06-2023
DOI: 10.21203/RS.3.RS-2970110/V1
Abstract: The use of solid-state electrolytes in all-solid-state batteries is a prospective technology for increasing energy densities. However, poor oxidative stability and issues with the dendrite significantly h er their applicability. LiBH 4 is considered as one of the most promising candidates due to its irreplaceable thermodynamic stability to Li. Herein, an in situ melting reaction is proposed to generate the covalently bonded coordination on the particle surfaces of electrolytes to resolve those issues. This coordination thermodynamically shuts down the electronic exchanges during the anionic oxidation decomposition by covalently bonding the local high-concentration electrons on the anions, and it kinetically blocks electronic percolation on the particle surfaces of electrolytes this phenomenon leads to an unprecedented voltage window (0 ~ 10 V) with a peak oxidation current that is 370 times lower and an electronic conductivity that is 3 orders of magnitude lower than the counterpart at 25 ℃. The coordination can act as a binder to bond electrolyte particles, achieving a remarkable Young’s modulus of 208.45 GPa this modulus is twice as high as the counterpart to adapt the sustained stress-strain release in Li plating and stripping. With these merits, the electrolyte displays a record-breaking critical current density of 21.65 mA cm − 2 at 25 ℃ (twice the best-reported data in Li-ion solid-state electrolytes), cycling stabilities under 10.83 mA cm − 2 for 6000 h and 10 V for 1000 h, and an operational temperature window of -30 to 150 ℃. Their Li-LiCoO 2 cells exhibit superior reversibility under high voltage. Our findings illuminate a clear direction for oxidative stability and dendrite suppression in solid-state electrolytes, making tremendous progress in high-voltage lithium batteries.
Effect of different additives on the hydrogen storage properties of the MgH2-LiAlH4 destabilized system
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1RA00209K
Dispersion of SnO2 nanocrystals on TiO2(B) nanowires as anode material for lithium ion battery applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1RA00500F
Differential photosynthetic response of marine planktonic and benthic diatoms to ultraviolet radiation under various temperature regimes
Publisher: Copernicus GmbH
Date: 14-03-2017
DOI: 10.5194/BG-2017-76
Abstract: Abstract. We studied the photophysiological response to ultraviolet radiation (UVR) of two diatoms, isolated from different environmental niches. Both species showed the highest sensitivity to UV radiation under relatively low temperature, while they were less inhibited under moderately increased temperature. Under the highest temperature applied in this study, the benthic diatom Nitzschia sp. showed minimal sensitivity to UV radiation, while inhibition of the planktonic species, Skeletonema sp., increased further compared with that at the growth temperature. These photochemical responses were linked to values for the repair and damage processes within the cell higher damage rates and lower repair rates were observed for Skeletonema sp. under suboptimal temperature, while for Nitzschia sp., repair rates increased and damage rates were stable within the applied temperature range. Our results suggested that the response of phytoplankton to UV radiation correlated with their niche environments, the periodic exposure to extreme temperature promote the resistance of benthic species to the combination of high temperature and UV radiation. Furthermore, the temperature-mediated UV sensitivities might also have implications for phytoplankton in the future warming oceans.
The future of seaweed aquaculture in a rapidly changing world
Publisher: Informa UK Limited
Date: 02-10-2017
A GBH/LiBH4 coordination system with favorable dehydrogenation
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM04485G
Graphene-wrapped reversible reaction for advanced hydrogen storage
Publisher: Elsevier BV
Date: 08-2016
Profiling of grazed cultures of the chlorophyte alga Dunaliella tertiolecta using an untargeted LC–MS approach
Publisher: Wiley
Date: 06-06-2022
DOI: 10.1111/JPY.13254
Abstract: Extracellular signals are reported to mediate chemical cross‐talk among pelagic microbes, including microalgal prey and predators. Water‐soluble mediator compounds play a crucial role in extracellular communication which is vital for prey recognition, attraction, capture, and predator deterrence. A range of exo‐metabolites including oxylipins and vitamins are released by prey in response to grazing stress. The temporal dynamics of such exo‐metabolites largely remains unknown, especially in large‐scale cultivation of microalgae such as closed or open ponds. In open ponds, infestation of predators is almost inevitable but highly undesirable due to the imminent threat of culture collapse. The early production of exo‐metabolites emitted by microalgal prey in response to predator attack could be leveraged as diagnostic markers of possible culture collapse. This study uses an untargeted approach for temporal profiling of Dunaliella tertiolecta ‐specific exo‐metabolites under grazing pressure from Oxyrrhis marina . We report 24 putatively identified metabolites, belonging to various classes such as short peptides, lipids, indole‐derivatives, and free amino acids, as potential markers of grazing‐mediated stress. In addition, this study outlines a clear methodology for screening of exo‐metabolites in marine algal s les, the analysis of which is frequently hindered by high salt concentrations. In future, a chemistry‐based targeted detection of these metabolites could enable a quick and on‐site screening of predators in microalgal cultures.
Synthesis of uniform polycrystalline tin dioxide nanofibers and electrochemical application in lithium-ion batteries
Publisher: Elsevier BV
Date: 07-2010
Fourier Transform Infrared spectroscopy as a novel tool to investigate changes in intracellular macromolecular pools in the marine microalga Chaetoceros muellerii (Bacillariophyceae)
Publisher: Wiley
Date: 18-04-2001
Photosynthetic performance of outdoor Nannochloropsis mass cultures under a wide range of environmental conditions
Publisher: Inter-Research Science Center
Date: 03-09-2009
DOI: 10.3354/AME01309
Interactive effects of PAR and UV-B radiation on PSII electron transport in the marine alga Dunaliella tertiolecta (Chlorophyceae)
Publisher: Wiley
Date: 27-05-2003
Environmental flows stimulate estuarine plankton communities by altered salinity structure and enhanced nutrient recycling
Publisher: Elsevier BV
Date: 12-2022
Porous Ni nanofibers with enhanced catalytic effect on the hydrogen storage performance of MgH2
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA03721B
Abstract: Porous Ni nanofibers (NFs) were synthesized via a single-nozzle electrospinning technique with subsequent calcination and reduction.
Differential responses of growth and photosynthesis in the marine diatom Chaetoceros muelleri to CO 2 and light availability
Publisher: Informa UK Limited
Date: 03-2011
DOI: 10.2216/10-11.1
General Synthesis of Transition Metal Oxide Ultrafine Nanoparticles Embedded in Hierarchically Porous Carbon Nanofibers as Advanced Electrodes for Lithium Storage
Publisher: Wiley
Date: 29-06-2016
DNA methylation and gene transcription act cooperatively in driving the adaptation of a marine diatom to global change
Publisher: Oxford University Press (OUP)
Date: 26-04-2023
DOI: 10.1093/JXB/ERAD150
Abstract: Genetic changes together with epigenetic modifications such as DNA methylation have been demonstrated to regulate many biological processes and thereby govern the response of organisms to environmental changes. However, how DNA methylation might act cooperatively with gene transcription and thereby mediate the long-term adaptive responses of marine microalgae to global change is virtually unknown. Here we performed a transcriptomic analysis, and a whole-genome bisulfite sequencing, along with phenotypic analysis of a model marine diatom Phaeodactylum tricornutum adapted for 2 years to high CO2 and/or warming conditions. Our results show that the methylated islands (peaks of methylation) mCHH were positively correlated with expression of genes in the subregion of the gene body when the populations were grown under high CO2 or its combination with warming for ~2 years. We further identified the differentially expressed genes (DEGs), and hence the metabolic pathways in which they function, at the transcriptomics level in differentially methylated regions (DMRs). Although DEGs in DMRs contributed only 18–24% of the total DEGs, we found that those DEGs acted cooperatively with DNA methylation and then regulated key processes such as central carbon metabolism, amino acid metabolism, ribosome biogenesis, terpenoid backbone biosynthesis, and degradation of misfolded proteins. Taken together, by integrating transcriptomic, epigenetic, and phenotypic analysis, our study provides evidence for DNA methylation acting cooperatively with gene transcription to contribute to the adaptation of microalgae to global changes.
Carbon hollow nanobubbles on porous carbon nanofibers: An ideal host for high-performance sodium-sulfur batteries and hydrogen storage
Publisher: Elsevier BV
Date: 09-2018
Improved reversible dehydrogenation of 2LiBH4+MgH2 system by introducing Ni nanoparticles
Publisher: Springer Science and Business Media LLC
Date: 27-04-2011
DOI: 10.1557/JMR.2011.72
Photoacclimation involves modulation of the photosynthetic oxygen-evolving reactions in Dunaliella tertiolecta and Phaeodactylum tricornutum
Publisher: CSIRO Publishing
Date: 2003
DOI: 10.1071/FP02140
Abstract: Net energy accumulation by marine microalgae at very low photon fluxes involves modulation of several attributes related to both the growth and photosynthetic physiology of these organisms. Here we studied flash-induced oscillatory patterns in oxygen evolution by previously dark-adapted cells of the green alga Dunaliella tertiolecta (Butcher) and the diatom Phaeodactylum tricornutum (Bohlin). The activity of the oxygen-evolving complex was found to be species-specific and influenced by photoacclimation. Results from measurements of oxygen flash yield obtained for these organisms grown under light-saturating conditions are directly comparable to those previously reported in the literature for other microalgae and higher plants. However, similar measurements on cells grown in low-light and/or light-starved conditions indicate an increased level of backward transitions (double misses) leading to the formation of super-reduced states (i.e. S–1 and S–2). Thus, in this communication, we present the first evidence that super-reduced states can be generated in vivo and speculate, on how they may be physiologically important.
Three-Dimensional MOFs@MXene Aerogel Composite Derived MXene Threaded Hollow Carbon Confined CoS Nanoparticles toward Advanced Alkali-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 28-01-2021
Light‐Driven Reversible Hydrogen Storage in Light‐Weight Metal Hydrides Enabled by Photothermal Effect
Publisher: Wiley
Date: 07-08-2022
Abstract: Requiring high temperature for hydrogen storage is the main feature impeding practical application of light metal hydrides. Herein, to lift the restrictions associated with traditional electric heating, light is used as an alternative energy input, and a light‐mediated catalytic strategy coupling photothermal and catalytic effects is proposed. With NaAlH 4 as the initial target material, TiO 2 nanoparticles uniformly distribute on carbon nanosheets (TiO 2 @C), which couples the catalytic effect of TiO 2 and photothermal property of C, is constructed to drive reversible hydrogen storage in NaAlH 4 under light irradiation. Under the catalysis of TiO 2 @C, complete hydrogen release from NaAlH 4 is achieved within 7 min under a light intensity of 10 sun. Furthermore, owing to the stable catalytic and photothermal effect of TiO 2 @C, NaAlH 4 delivers a reversible capacity of 4 wt% after 10 cycles with a capacity retention of 85% under light irradiation only. The proposed strategy is also applicable to other light metal hydrides such as LiAlH 4 and MgH 2 , validating its universality. The concept of light‐driven hydrogen storage provides an alternative approach to electric heating, and the light‐mediated catalytic strategy proposed herein paves the way to the design of reversible high‐density hydrogen storage systems that do not rely on artificial energy.
TiO2(B)@carbon composite nanowires as anode for lithium ion batteries with enhanced reversible capacity and cyclic performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM03873C
Significantly improved dehydrogenation of LiAlH4 catalysed with TiO2 nanopowder
Publisher: Elsevier BV
Date: 07-2011
Stabilization of NaZn(BH4)3via nanoconfinement in SBA-15 towards enhanced hydrogen release
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2TA00195K
Hydrogen storage properties of MgH2–SiC composites
Publisher: Elsevier BV
Date: 03-2009
Combined effects of hydrogen back-pressure and NbF5 addition on the dehydrogenation and rehydrogenation kinetics of the LiBH4–MgH2 composite system
Publisher: Elsevier BV
Date: 03-2013
Easy preparation of SnO2@carbon composite nanofibers with improved lithium ion storage properties
Publisher: Springer Science and Business Media LLC
Date: 08-2010
Abstract: SnO 2 @carbon nanofibers were synthesized by a combination of electrospinning and subsequent thermal treatments in air and then in argon to demonstrate their potential use as an anode material in lithium ion battery applications. The as-prepared SnO 2 @carbon nanofibers consist of SnO 2 nanoparticles/nanocrystals encapsulated in a carbon matrix and contain many mesopores. Because of the charge pathways, both for the electrons and the lithium ions, and the buffering function provided by both the carbon encapsulating the SnO 2 nanoparticles and the mesopores, which tends to alleviate the volumetric effects during the charge/discharge cycles, the nanofibers display a greatly improved reversible capacity of 420 mAh/g after 100 cycles at a constant current of 100 mA/g, and a sharply enhanced reversible capacity at higher rates (0.5, 1, and 2 C) compared with pure SnO 2 nanofibers, which makes it a promising anode material for lithium ion batteries.
Modulation of photosynthesis and inorganic carbon acquisition in a marine microalga by nitrogen, iron, and light availability
Publisher: Canadian Science Publishing
Date: 07-2005
DOI: 10.1139/B05-081
Abstract: The marine microalga Dunaliella tertiolecta Butcher expresses a high affinity for dissolved inorganic carbon (DIC) through a carbon-concentrating mechanism (CCM), known to be influenced by CO 2 availability and instantaneous light supply. However, the regulation by light and nutrient supply during growth is less understood, although N and Fe limitation impose an energy limitation by compromising the photosynthetic apparatus. Dunaliella tertiolecta was grown under steady-state conditions of limited light, N, and Fe availability, and the affinity for DIC was measured under saturating light. High affinity DIC uptake capacity was maintained by D. tertiolecta under all growth-limiting conditions, but was modulated in response to the limiting resource. Affinity of photosynthesis for DIC(k 0.5 ) was significantly reduced in cells grown under low light, both in turbidostats and in batch culture (p ≤ 0.03), although cell-normalized P max was not significantly affected. In contrast, N and Fe limitation resulted in a significant reduction in cell chlorophyll, P max , and maximum photosystem II quantum yield (F v /F m ), but the affinity for DIC was enhanced with increasing N or Fe stress. While the affinity for DIC improved with increasing N stress (k 0.5 17.8 µM at µ = 0.27 d 1 versus k 0.5 26 µM at µ ≥ 0.77 d 1 ), light use efficiency (α) was impaired under N limitation, suggesting a trade-off between light harvesting capacity and active DIC uptake. Stable C isotope analysis of Fe-limited cells confirmed a lower fractionation by the most Fe-limited cells, consistent with the k 0.5 data and more active DIC acquisition (δ 13 C = 19.56 at µ = 0.27 d 1 cf. δ 13 C = 26.28 at µ = 0.77 d 1 ). Assessment of affinity for DIC using k 0.5 was supported by the close fit of P versus DIC curves to MichaelisMenten kinetics with the high DIC affinity of D. tertiolecta, there was poor resolution in the initial slope of the P versus DIC curve as a parameter of affinity for DIC. Enhanced DIC uptake efficiency under Fe and N limitation may relate to improved resource-use efficiency conferred by CCM activity.Key words: algae, carbon-concentrating mechanism, iron, light, nitrogen, nutrient limitation, photosynthesis.
Environmental influences on akinete germination and development in Nodularia spumigena (Cyanobacteriaceae), isolated from the Gippsland Lakes, Victoria, Australia
Publisher: Springer Science and Business Media LLC
Date: 12-04-2010
A Combined Hydrogen Storage System of Mg(BH4)2−LiNH2with Favorable Dehydrogenation
Publisher: American Chemical Society (ACS)
Date: 18-03-2010
DOI: 10.1021/JP910547S
High-Energy and Long-Cycling All-Solid-State Lithium-Ion Batteries with Li- and Mn-Rich Layered Oxide Cathodes and Sulfide Electrolytes
Publisher: American Chemical Society (ACS)
Date: 17-08-2022
Mixed-metal (Li, Al) amidoborane: synthesis and enhanced hydrogen storage properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2TA00697A
Ecological implications of microalgal and cyanobacterial CO2 concentrating mechanisms, and their regulation
Publisher: CSIRO Publishing
Date: 2002
DOI: 10.1071/PP01195
Abstract: The capacity of algae to express CO2 concentrating mechanisms (CCMs) is regulated by environmental factors. Some of these factors, especially photon flux, can influence the instantaneous activity of a CCM without necessarily affecting gene expression or the capacity of the cell to transport inorganic carbon. Other environmental parameters, especially those causing changes in the availability of CO2 dissolved in the surrounding medium, act at a transcriptional level. In this review, the complex interactions between environmental factors in controlling CCM activity will be discussed, as will the ecological consequences of CCMs as they relate to the growth and ecological performance of algal cells in nature. We also consider the consequences of global climate change for the performance of algae with and without CCMs.
The effect of various cations/anions for MgH2 hydrolysis reaction
Publisher: Elsevier BV
Date: 05-2021
Nanoconfinement significantly improves the thermodynamics and kinetics of co-infiltrated 2LiBH4–LiAlH4 composites: Stable reversibility of hydrogen absorption/resorption
Publisher: Elsevier BV
Date: 10-2013
Synthesis of uniform TiO2@carbon composite nanofibers as anode for lithium ion batteries with enhanced electrochemical performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM14852H
In vivo prediction of the nutrient status of individual microalgal cells using Raman microspectroscopy
Publisher: Oxford University Press (OUP)
Date: 10-2007
DOI: 10.1111/J.1574-6968.2007.00861.X
Abstract: An in vivo method for predicting the nutrient status of in idual algal cells using Raman microspectroscopy is described. Raman spectra of cells using 780 nm laser excitation show enhanced bands mainly attributable to chlorophyll a and beta-carotene. The relative intensities of chlorophyll a and beta-carotene bands changed under nitrogen limitation, with chlorophyll a bands becoming less intense and beta-carotene bands more prominent. Although spectra from N-replete and N-starved cell populations varied, each distribution was distinct enough such that multivariate classification methods, such as partial least squares discriminant analysis, could accurately predict the nutrient status of the cells from the Raman spectral data.
Allometry and stoichiometry of unicellular, colonial and multicellular phytoplankton
Publisher: Wiley
Date: 16-12-2008
DOI: 10.1111/J.1469-8137.2008.02660.X
Abstract: Contents Summary 295 I. Introduction 296 II. Unicellular, pseudocolonial, colonial and multicellular phytoplankton: definitions, taxonomy and morphology 296 III. Symbioses 298 IV. Physical constraints on size, morphology and motility 298 V. Elemental stoichiometry 302 VI. Allometry of specific growth rates and specific metabolic rates 302 VII. Trophic interactions 303 VIII. Global significance of large unicells, colonies and multicellular organisms 303 IX. Significance of colonies and multicellular organisms relative to large unicells in the phytoplankton 304 Acknowledgements 306 References 306
Gross and net primary production: Closing the gap between concepts and measurements
Publisher: Inter-Research Science Center
Date: 03-09-2009
DOI: 10.3354/AME01305
Diversity of carbon use strategies in a kelp forest community: Implications for a high CO 2 ocean
Publisher: Wiley
Date: 21-03-2011
In situ fabrication of three-dimensional nitrogen and boron co-doped porous carbon nanofibers for high performance lithium-ion batteries
Publisher: Elsevier BV
Date: 08-2016
Inorganic carbon acquisition by eight species of Caulerpa (Caulerpaceae, Chlorophyta)
Publisher: Informa UK Limited
Date: 05-07-2006
DOI: 10.2216/05-55.1.
Supplementary material to "Ocean acidification modulates expression of genes and physiological performance of a marine diatom"
Publisher: Copernicus GmbH
Date: 24-09-2015
Hyposalinity tolerance inthecoccolithophorid <i>Emiliania huxleyi</i> under the influence of ocean acidification involves enhanced photosynthetic performance
Publisher: Copernicus GmbH
Date: 15-02-2019
DOI: 10.5194/BG-2019-4
Abstract: Abstract. While seawater acidification induced by elevated CO2 is known to impact coccolithophores, the effects in combination with decreased salinity caused by sea ice melting and/or hydrological events have not been documented. Here we show the combined effects of seawater acidification and reduced salinity on growth, photosynthesis and calcification of Emiliania huxleyi grown at 2 CO2 concentrations (low CO2 LC: 400 μatm high CO2 HC: 1000 μatm) and 3 levels of salinity (25, 30 and 35 ‰). A decrease of salinity from 35 to 25‰ increased growth rate, cell size and effective photochemical efficiency under both LC or HC. Calcification rates were relatively insensitive to combined effects of salinity and OA treatment but were highest under 3 5‰ and HC conditions, with higher ratios of calcification to photosynthesis (C : P) in the cells grown under 35 ‰ compared with those grown at 25 ‰. In addition, elevated dissolved inorganic carbon (DIC) concentration at the salinity of 35 ‰ stimulated its calcification. In contrast, photosynthetic carbon fixation increased almost linearly with decreasing salinity, regardless of the pCO2 treatments. When subjected to short-term exposure to high light, the low-salinity-grown cells showed the highest photochemical effective quantum yield with the highest repair rate, though HC treatment enhanced PSII damage rate. Our results suggest Emiliania huxleyi can tolerate low salinity plus acidification conditions by up-regulating its photosynthetic performance together with a relatively insensitive calcification response, which may help it better adapt to future ocean global environmental changes, especially in the coastal areas of high latitudes.
The hydrogen storage properties and reaction mechanism of the MgH 2 –NaAlH 4 composite system
Publisher: Elsevier BV
Date: 07-2011
Ocean urea fertilization for carbon credits poses high ecological risks
Publisher: Elsevier BV
Date: 06-2008
CO2 concentrating mechanisms in algae: Mechanisms, environmental modulation, and evolution
Publisher: Annual Reviews
Date: 06-2005
DOI: 10.1146/ANNUREV.ARPLANT.56.032604.144052
Abstract: The evolution of organisms capable of oxygenic photosynthesis paralleled a long-term reduction in atmospheric CO 2 and the increase in O 2 . Consequently, the competition between O 2 and CO 2 for the active sites of RUBISCO ribulose bisphosphate carboxylase/oxygenase became more and more restrictive to the rate of photosynthesis. In coping with this situation, many algae and some higher plants acquired mechanisms that use energy to increase the CO 2 concentrations (CO 2 concentrating mechanisms, CCMs CO 2 concentrating mechanism ) in the proximity of RUBISCO. A number of CCM variants are now found among the different groups of algae. Modulating the CCMs may be crucial in the energetic and nutritional budgets of a cell, and a multitude of environmental factors can exert regulatory effects on the expression of the CCM components. We discuss the ersity of CCMs, their evolutionary origins, and the role of the environment in CCM modulation.
Potential triggers of akinete differentiation in Nodularia spumigena (Cyanobacteriaceae) isolated from Australia
Publisher: Springer Science and Business Media LLC
Date: 12-05-2011
Editorial
Publisher: Informa UK Limited
Date: 08-03-2020
Interactions between the impacts of ultraviolet radiation, elevated CO 2, and nutrient limitation on marine primary producers
Publisher: Springer Science and Business Media LLC
Date: 09-2009
DOI: 10.1039/B9PP00034H
Abstract: It is well known that UV radiation can cause deleterious effects to the physiological performance, growth and species assemblages of marine primary producers. In this review we describe the range of interactions observed between these impacts of ultraviolet radiation (UVR, 280-400 nm) with other environmental factors such as the availability of photosynthetically active radiation (PAR), nutrient status and levels of dissolved CO2, all of which can, in turn, be influenced by global climate change. Thus, increases in CO2 levels can affect the sensitivity of some species to UV-B radiation (UV-B), while others show no such impact on UV-B susceptibility. Both nitrogen- and phosphorus-limitation can have direct interactive effects on the susceptibility of algal cells and communities to UVR, though such effects are somewhat variable. Nutrient depletion can also potentially lead to a dominance of smaller celled species, which may be less able to screen out and are thus likely to be more susceptible to UVR-induced damage. The variability of responses to such interactions can lead to alterations in the species composition of algal assemblages.
Catchment urbanization increases benthic microalgal biomass in streams under controlled light conditions
Publisher: Springer Science and Business Media LLC
Date: 13-08-2007
Synergistic effect of lithiophilic Zn nanoparticles and N-doping for stable Li metal anodes
Publisher: Elsevier BV
Date: 02-2022
Building a House for Stabilizing Lithium‐Metal Anodes
Publisher: Wiley
Date: 04-03-2022
Abstract: Lithium (Li) metal is regarded as one of the most promising anode candidates for future high energy density lithium batteries. The practical application of Li‐metal anodes, however, is hindered by the uncontrollable growth of dendrites resulting from both huge volume change and unstable solid‐electrolyte interfaces upon cycling. Herein, we propose a novel “house strategy” that utilizes the 3D NiO nanosheets decorated nickel foam as the frame to confine Li metal and the inorganic [LiNBH] n chains with high Li ion conductivity as the artificial protective proof to establish a stable dendrite‐free Li metal anode. Benefiting from the synergistic effect of the 3D NiO/Ni foam in lowering the local current density and accommodating the huge volume change of Li metal and the [LiNBH] n protective layer in facilitating uniform Li + diffusion and regulating Li deposition beneath this layer, the LiNBH‐Li@Ni electrode presents an excellent long‐term cycling lifespan of over 800 h at both 1 and 3 mA cm −2 with a high areal capacity of 5 mAh cm −2 in symmetric cells. Upon coupling this anode with LiFePO 4 cathode, the thus‐assembled full cells deliver an ultrahigh reversible capacity of 127.4 mAh g −1 at 1 C after 200 cycles.
Reversible Hydrogen Storage in Destabilized LiAlH4−MgH2−LiBH4 Ternary-Hydride System Doped with TiF3
Publisher: American Chemical Society (ACS)
Date: 10-06-2010
DOI: 10.1021/JP1012208
Highly uniform TiO2/SnO2/carbon hybrid nanofibers with greatly enhanced lithium storage performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11751K
Short-term variations in photosynthetic parameters of Nannochloropsis cultures grown in two types of outdoor mass cultivation systems
Publisher: Inter-Research Science Center
Date: 03-09-2009
DOI: 10.3354/AME01318
Decreased motility of flagellated microalgae long-term acclimated to CO2-induced acidified waters
Publisher: Springer Science and Business Media LLC
Date: 06-2020
Dehydrogenation characteristics of Ti- and Ni/Ti-catalyzed Mg hydrides
Publisher: Elsevier BV
Date: 07-2009
Discrimination of cyanobacterial strains isolated from saline soils in Nakhon Ratchasima, Thailand using attenuated total reflectance FTIR spectroscopy
Publisher: Wiley
Date: 19-07-2010
Abstract: A method was developed whereby high quality FTIR spectra could be rapidly acquired from soil‐borne filamentous cyanobacteria using ATR FTIR spectroscopy. Spectra of all strains displayed bands typical of those previously reported for microalgae and water‐borne cyanobacteria, with each strain having a unique spectral profile. Most variation between strains occurred in the C–O stretching and the amide regions. Soft Independent Modelling by Class Analogy (SIMCA) was used to classify the strains with an accuracy of better than 93%, with best classification results using the spectral region from 1800–950 cm –1 . Despite this spectral region undergoing substantial changes, particularly in amide and C–O stretching bands, as cultures progressed through the early‐, mid‐ to late‐exponential growth phases, classification accuracy was still good (∼80%) with data from all growth phases combined. These results indicate that ATR/FTIR spectroscopy combined with chemometric classification methods constitute a rapid, reproducible, and potentially automated approach to classifying soil‐borne filamentous cyanobacteria. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Hydrangea-Shaped 3D Hierarchical Porous Magnesium Hydride–Carbon Framework with High Rate Performance for Lithium Storage
Publisher: American Chemical Society (ACS)
Date: 17-07-2019
Abstract: Magnesium hydride (MgH
Non-photochemical quenching, a non-invasive probe for monitoring microalgal grazing: an early indicator of predation by Oxyrrhis marina and Euplotes sp.
Publisher: Informa UK Limited
Date: 11-03-2020
TRANSPORT OF INORGANIC CARBON AND THE 'CO2CONCENTRATING MECHANISM' IN CHLORELLA EMERSONII (CHLOROPHYCEAE)
Publisher: Wiley
Date: 06-1981
Monodisperse Magnesium Hydride Nanoparticles Uniformly Self‐Assembled on Graphene
Publisher: Wiley
Date: 28-08-2015
Abstract: Monodisperse MgH2 nanoparticles with homogeneous distribution and a high loading percent are developed through hydrogenation-induced self-assembly under the structure-directing role of graphene. Graphene acts not only as a structural support, but also as a space barrier to prevent the growth of MgH2 nanoparticles and as a thermally conductive pathway, leading to outstanding performance.
Encapsulation of TiO2(B) nanowire cores into SnO2/carbon nanoparticle shells and their high performance in lithium storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10837A
Abstract: TiO(2)(B)@SnO(2)/carbon hybrid nanowires have been synthesized by two simple hydrothermal processes and subsequent heat treatment in argon. The composite has a unique architecture, as its morphology consists of particles having a TiO(2)(B) nanowire core and a porous SnO(2)/carbon nanoparticle shell layer. The unique core/shell structure and chemical composition will be useful for many potential applications, including the lithium ion battery. The electrochemical results on the composite are presented to demonstrate the superior cycling performance and rate capability of the TiO(2)(B)@SnO(2)/carbon nanowires. This composite exhibits a high reversible capacity of ∼669mAhg(-1), and excellent cycling stability, indicating that the composite is a promising anode material for Li-ion batteries.
Constitutive cylindrospermopsin pool size in Cylindrospermopsis raciborskii under different light and CO<inf>2</inf> partial pressure conditions
Publisher: American Society for Microbiology
Date: 05-2015
DOI: 10.1128/AEM.03556-14
Abstract: Cylindrospermopsin (CYN) and 7-deoxy-cylindrospermopsin (dCYN) are potent hepatotoxic alkaloids produced by numerous species of cyanobacteria, including the freshwater Cylindrospermopsis raciborskii . C. raciborskii is an invasive cyanobacterium, and the study of how environmental parameters drive CYN production has received significant interest from water managers and health authorities. Light and CO 2 affect cell growth and physiology in photoautotrophs, and these are potential regulators of cyanotoxin biosynthesis. In this study, we investigated how light and CO 2 affect CYN and dCYN pool size as well as the expression of the key genes, cyrA and cyrK , involved in CYN biosynthesis in a toxic C. raciborskii strain. For cells growing at different light intensities (10 and 100 μmol photons m −2 s −1 ), we observed that the rate of CYN pool size production (μ CYN ) was coupled to the cell ision rate (μ c ) during batch culture. This indicated that CYN pool size under our experimental conditions is constant and cell quotas of CYN (Q CYN ) and dCYN (Q dCYN ) are fixed. Moreover, a lack of correlation between expression of cyrA and total CYN cell quotas (Q CYNs ) suggests that the CYN biosynthesis is regulated posttranscriptionally. Under elevated CO 2 (1,300 ppm), we observed minor effects on Q CYN and no effects on expression of cyrA and cyrK . We conclude that the CYN pool size is constitutive and not affected by light and CO 2 conditions. Thus, C. raciborskii bloom toxicity is determined by the absolute abundance of C. raciborskii cells within the water column and the relative abundance of toxic and nontoxic strains.
Plum-branch-like carbon nanofibers decorated with SnO2 nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0NR00009D
Abstract: Novel plum-branch-like carbon nanofibers (CNFs) decorated with SnO2 nanocrystals have been synthesized by electrospinning and subsequent thermal treatment in an Ar/H2O atmosphere. The morphologies of the as-synthesized SnO2/CNF composites and the contents of carbon and SnO2 can be controlled by adjusting the heat treatment temperature. It is proposed that the growth of SnO2/CNF composites follows the outward diffusion of tin composites from the as-spun tin composite olyacrylonitrile (PAN) nanofibers, pyrolysis of PAN and oxidation of tin composites, and then formation of SnO2 nanocrystals around the CNFs. This novel 1D SnO2/CNF composite may have potential application in nanobatteries, nano fuel cells, and nanosensors. A preliminary result has revealed that the SnO2/CNF composite presents favourable electrochemical performance in lithium-ion batteries.
Changes in growth, chlorophyll fluorescence and fatty acid composition with culture age in batch cultures of Phaeodactylum tricornutum and Chaetoceros muelleri (Bacillariophyceae)
Publisher: Walter de Gruyter GmbH
Date: 2006
DOI: 10.1515/BOT.2006.021
Hydrazine bisborane as a promising material for chemical hydrogen storage
Publisher: Elsevier BV
Date: 10-2011
PHOTOSYNTHETIC CHARACTERIZATION OF DEVELOPING AND MATURE AKINETES OFAPHANIZOMENON OVALISPORUM(CYANOPROKARYOTA)1
Publisher: Wiley
Date: 30-07-2007
Protein turnover in relation to maintenance metabolism at low photon flux in two marine microalgae
Publisher: Wiley
Date: 05-2003
Differential photosynthetic responses of marine planktonic and benthic diatoms to ultraviolet radiation under various temperature regimes
Publisher: Copernicus GmbH
Date: 14-11-2017
Abstract: Abstract. We studied the photophysiological responses to ultraviolet radiation (UVR) of two diatoms, isolated from different environmental niches. Both species showed the highest sensitivity to UV radiation under relatively low temperature, while they were less inhibited under moderately increased temperature. Under the highest temperature applied in this study, the benthic diatom Nitzschia sp. showed minimal sensitivity to UV radiation, while inhibition of the planktonic species, Skeletonema sp., increased further compared with that at the growth temperature. These photochemical responses were linked to values for the repair and damage processes within the cell higher damage rates and lower repair rates were observed for Skeletonema sp. under suboptimal temperature, while for Nitzschia sp., repair rates increased and damage rates were stable within the applied temperature range. Our results suggested that the response of the microalgae to UV radiation correlated with their niche environments, the periodic exposure to extreme temperatures promoting the resistance of the benthic species to the combination of high temperature and UV radiation.
Reversible hydrogen storage in titanium-catalyzed LiAlH4–LiBH4 system
Publisher: Elsevier BV
Date: 11-0099
Chlorophyll fluorescence and ecophysiology: seeing red?
Publisher: Wiley
Date: 10-01-2006
IS THE GROWTH RATE HYPOTHESIS APPLICABLE TO MICROALGAE?1
Publisher: Wiley
Date: 20-01-2010
Changes in pH at the exterior surface of plankton with ocean acidification
Publisher: Springer Science and Business Media LLC
Date: 15-04-2012
DOI: 10.1038/NCLIMATE1489
Dehydrogenation Promotion of LiBH4·NH3 Through Heating in Ammonia or Mixing with Metal Hydrides
Publisher: American Chemical Society (ACS)
Date: 02-07-2010
DOI: 10.1021/JP1038255
Taxon-specific responses of Southern Ocean diatoms to Fe enrichment revealed by synchrotron radiation FTIR microspectroscopy
Publisher: Copernicus GmbH
Date: 20-10-2014
Abstract: Abstract. Photosynthesis by marine diatoms contributes substantially to global biogeochemical cycling and ecosystem productivity. It is widely accepted that diatoms are extremely sensitive to changes in Fe availability, with numerous in situ experiments demonstrating rapid growth and increased export of elements (e.g. C, Si and Fe) from surface waters as a result of Fe addition. Less is known about the effects of Fe enrichment on the phenotypes of diatoms, such as associated changes in nutritional value – furthermore, data on taxon-specific responses are almost non-existent. Enhanced supply of nutrient-rich waters along the coast of the subantarctic Kerguelen Island provide a valuable opportunity to examine the responses of phytoplankton to natural Fe enrichment. Here we demonstrate the use of synchrotron radiation Fourier Transform Infrared (SR-FTIR) microspectroscopy to analyse changes in the macromolecular composition of diatoms collected along the coast and plateau of Kerguelen Island, Southern Ocean. SR-FTIR microspectroscopy enabled the analysis of in idual diatom cells from mixed communities of field-collected s les, thereby providing insight into in situ taxon-specific responses in relation to changes in Fe availability. Phenotypic responses were taxon-specific in terms of intraspecific variability and changes in proteins, amino acids, phosphorylated molecules, silicate/silicic acid and carbohydrates. In contrast to some previous studies, silicate/silicic acid levels increased under Fe enrichment, in conjunction with increases in carbohydrate stores. The highly abundant taxon Fragilariopsis kerguelensis displayed a higher level of phenotypic plasticity than Pseudo-nitzschia spp., while analysis of the data pooled across all measured taxa showed different patterns in macromolecular composition compared to those for in idual taxon. This study demonstrates that taxon-specific responses to Fe enrichment may not always be accurately reflected by bulk community measurements, highlighting the need for further research into taxon-specific phenotypic responses of phytoplankton to environmental change.
Bacterial fermentation and respiration processes are uncoupled in anoxic permeable sediments
Publisher: Springer Science and Business Media LLC
Date: 11-03-2019
DOI: 10.1038/S41564-019-0391-Z
Abstract: Permeable (sandy) sediments cover half of the continental margin and are major regulators of oceanic carbon cycling. The microbial communities within these highly dynamic sediments frequently shift between oxic and anoxic states, and hence are less stratified than those in cohesive (muddy) sediments. A major question is, therefore, how these communities maintain metabolism during oxic-anoxic transitions. Here, we show that molecular hydrogen (H
Thermodynamically favored stable hydrogen storage reversibility of NaBH4 inside of bimetallic nanoporous carbon nanosheets
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA10361J
Abstract: Thermodynamically favored reversible hydrogen storage of NaBH 4 is developed via the reversible transformation between NiB/CoB and Ni 2 B/Co 2 B, leading to a significant decrease of Gibbs free energy change for the reversible hydrogen storage of NaBH 4 .
Oxidative and anti-oxidative responses to metal toxicity in an extremophilic alga (Cyanidium caldarium) and a neutrophilic alga (Chlamydomonas reinhardtii)
Publisher: Informa UK Limited
Date: 03-09-2021
Elevated co2 has Differential Effects on Five Species of Microalgae from a Subtropical Freshwater Lake: Possible Implications for Phytoplankton Species Composition
Publisher: Wiley
Date: 23-12-2021
DOI: 10.1111/JPY.13104
Nitrogen limitation in Dunaliella tertiolecta (Chlorophyceae) leads to increased susceptibility to damage by ultraviolet-B radiation but also increased repair capacity
Publisher: Wiley
Date: 08-2002
Improvement of the LiAlH4−NaBH4 System for Reversible Hydrogen Storage
Publisher: American Chemical Society (ACS)
Date: 21-05-2009
DOI: 10.1021/JP808269V
Erratum: Differential responses of growth and photosynthesis in the marine diatom Chaetoceros muelleri to CO2 and light availability (Phycologia (2011) 50:2 (182-193))
Publisher: Informa UK Limited
Date: 2013
Ammonia borane confined by nitrogen-containing carbon nanotubes: enhanced dehydrogenation properties originating from synergetic catalysis and nanoconfinement
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA05540G
Abstract: AB@PPy composites synthesized by a solution method show favorable dehydrogenation properties.
Altritol synthesis by Notheia anomala
Publisher: Elsevier BV
Date: 10-2001
DOI: 10.1016/S0031-9422(01)00286-2
Abstract: The linear hexitol altritol has only been identified in six genera, all of them in the order Fucales of the brown algae. Five of these genera are closely related according to molecular phylogenetic and other data, while the sixth (Notheia) is an obligate epiphyte on two other altritol-containing genera with which it is symphanic. The possibility that Notheia obtains altritol from the algae on which it is epiphytic rather than by synthesizing altritol independently was investigated by supplying 13C-inorganic carbon in the light followed by mass spectrometric and nuclear magnetic resonance analysis. Notheia separated from the phorophyte Hormosira during exposure to 13C showed 13C enrichment in both altritol and mannitol, while the Hormosira only showed significant labelling of mannitol. These data show that altritol can be synthesized by Notheia, with implications for the number of gains and losses of the capacity to synthesize altritol in the evolution of the Fucales.
Nano-confined multi-synthesis of a Li-Mg-N-H nanocomposite towards low-temperature hydrogen storage with stable reversibility
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA00259A
Abstract: De-/re-hydrogenation of Li 2 Mg(NH) 2 at a temperature as low as 105 °C and stable reversibility through up to 20 cycles are successfully achieved by the nanosize-induced effects by double-shelled hollow carbon spheres.
Evidence for a CO2concentrating mechanism in Botrydiopsis (Tribophyceae)
Publisher: Informa UK Limited
Date: 08-2008
Living in a high CO2 world: Impacts of global climate change on marine phytoplankton
Publisher: Informa UK Limited
Date: 15-12-2009
A red tide alga grown under ocean acidification up-regulates its tolerance to lower pH by increasing its photophysiological functions
Publisher: Copernicus GmbH
Date: 05-05-2014
Abstract: Abstract. Phaeocystis globosa, a red tide alga, often forms blooms in or adjacent to coastal waters and experiences changes of pH and seawater carbonate chemistry caused by either diel eriodic fluctuation in biological activity, human activity or, in the longer term, ocean acidification due to atmospheric CO2 rise. We examined the photosynthetic physiology of this species while growing it under different pH levels induced by CO2 enrichment and investigated its acclimation to carbonate chemistry changes under different light levels. Short-term exposure to reduced pHnbs (7.70) decreased the alga's photosynthesis and light use efficiency. However, acclimation to the reduced pH level for 1–19 generations led to recovered photosynthetic activity, being equivalent to that of cells grown under pH 8.07 (control), though such acclimation required a different time span (number of generations) under different light regimes. The low-pH grown cells increased their contents of chlorophyll and carotenoids with prolonged acclimation to the acidification, with increased photosynthetic quantum yield and decreased non-photochemical quenching. The specific growth rate of the low-pH grown cells also increased to emulate that grown under the ambient pH level. This study clearly shows that Phaeocystis globosa is able to acclimate to seawater acidification by increasing its energy capture and decreasing its non-photochemcial energy loss.
Relative effects of local and landscape factors on wetland algal biomass over a salinity gradient
Publisher: Springer Science and Business Media LLC
Date: 24-10-2010
Carbon isotope discrimination and the CO2 accumulating mechanism in Chlorella emersonii
Publisher: Oxford University Press (OUP)
Date: 08-1982
DOI: 10.1093/JXB/33.4.729
Interactions between UV-B exposure and phosphorus nutrition. II. Effects on rates of damage and repair
Publisher: Wiley
Date: 16-11-2005
Improved hydrogen desorption in lithium alanate by addition of SWCNT–metallic catalyst composite
Publisher: Elsevier BV
Date: 03-2011
Insights into the evolution of CCMs from comparisons with other resource acquisition and assimilation processes
Publisher: Wiley
Date: 03-01-2008
DOI: 10.1111/J.1399-3054.2007.01024.X
Abstract: Regarding inorganic carbon as 'just another' chemical resource used in the growth of aquatic photolithotrophs, we ask three questions and then attempt to answer them. (1) How common are catalysed chemical changes of the resource outside the cell, and accumulation of the resource inside the cell prior to assimilation, for the erse chemical resources used? (2) Do acquisition and assimilation meet evolutionary optimality criteria with respect to the use of other resources? (3) Are there clues to the evolutionary origin of inorganic carbon concentrating mechanism (CCMs) in the mechanisms of acquisition of other resources and vice versa? Evidence considered includes molecular genetic similarities between CCM components and components of other resource acquisition mechanisms, and palaeogeochemical evidence on the timing of restrictions on the availability of the resources such that extracellular transformation of materials, and their accumulation within cells prior to assimilation, are needed. Provisional answers to the questions are as follows: (1) Many common chemical resources other than inorganic carbon are subject to extracellular chemical conversion and/or accumulation prior to assimilation, e.g. ammonium, nitrate, urea, amino acids, organic and inorganic phosphate and iron (2) There is some evidence for optimality of CCMs and of less complex resource acquisition processes, exemplified by NH(4)(+) entry and assimilation, though many more data are needed and (3) There are molecular genetic similarities between CCM components and transporters for other solutes and components of respiratory NADH dehydrogenases that are consistent with their use in CCMs representing a derived evolutionary state. Palaeogeochemical evidence suggests that CCMs evolved later than did at least some of the extracellular chemical transformation and/or accumulation mechanisms for other resources.
BENTHIC MICROALGAL COLONIZATION IN STREAMS OF DIFFERING RIPARIAN COVER AND LIGHT AVAILABILITY
Publisher: Wiley
Date: 22-11-2004
SnSb alloy nanoparticles embedded in N-doped porous carbon nanofibers as a high-capacity anode material for lithium-ion batteries
Publisher: Elsevier BV
Date: 03-2019
Inorganic carbon acquisition by Dunaliella tertiolecta (chlorophyta) involves external carbonic anhydrase and direct HCO3 - utilization insensitive to the anion exchange inhibitor DIDS
Publisher: Informa UK Limited
Date: 02-2001
Supplementary material to "Hyposalinity tolerance inthecoccolithophorid <i>Emiliania huxleyi</i> under the influence of ocean acidification involves enhanced photo
Publisher: Copernicus GmbH
Date: 15-02-2019
The effects of copper and zinc on biomass and taxonomic composition of algal periphyton communities from the River Gharasou, Western Iran
Publisher: Uniwersytet Gdanski
Date: 09-2009
DOI: 10.2478/V10009-009-0027-3
Abstract: Indoor artificial streams were used to evaluate the short-term (24 day) influence of copper and zinc, in idually and in combination, on the biomass and taxonomic composition of algal periphyton communities. The effects of Cu (50 μg 1 -1 ) and Zn (1 mg 1 -1 ) were assessed using measurements of biomass, ash-free dry mass (AFDM), chlorophyll- a concentration, taxonomic composition and biovolume. In artificial streams with Cu, Zn and Cu+Zn, there were significant ( p 0.05) reductions of chlorophyll- a concentrations, dry mass and AFDM, and also changes in the species ersity and relative abundances of periphyton species. In artificial streams containing both Cu and Zn the taxonomic composition shifted from a Cyanophyceaen dominated community to one consisting mainly of Chlorophyceae, whilst the relative contribution of Bacillariophyceae was not significantly altered.
Physiological and biochemical responses of Thalassiosira punctigera to nitrate limitation
Publisher: Informa UK Limited
Date: 03-04-2018
Photoacclimation in Dunaliella tertiolecta reveals a unique NPQ pattern upon exposure to irradiance
Publisher: Springer Science and Business Media LLC
Date: 20-11-2011
Non-photochemical quenching, a non-invasive probe for monitoring microalgal grazing: influence of grazing-mediated total ammonia-nitrogen
Publisher: Informa UK Limited
Date: 14-03-2020
Seaweeds in cold seas: Evolution and carbon acquisition
Publisher: Oxford University Press (OUP)
Date: 04-09-2002
DOI: 10.1093/AOB/MCF171
Abstract: Much evidence suggests that life originated in hydrothermal habitats, and for much of the time since the origin of cyanobacteria (at least 2.5 Ga ago) and of eukaryotic algae (at least 2.1 Ga ago) the average sea surface and land surface temperatures were higher than they are today. However, there have been at least four significant glacial episodes prior to the Pleistocene glaciations. Two of these (approx. 2.1 and 0.7 Ga ago) may have involved a 'Snowball Earth' with a very great impact on the algae (sensu lato) of the time (cyanobacteria, Chlorophyta and Rhodophyta) and especially those that were adapted to warm habitats. By contrast, it is possible that heterokont, dinophyte and haptophyte phototrophs only evolved after the Carboniferous-Permian ice age (approx. 250 Ma ago) and so did not encounter low (</=5 degrees C) sea surface temperatures until the Antarctic cooled some 15 Ma ago. Despite this, many of the dominant macroalgae in cooler seas today are (heterokont) brown algae, and many laminarians cannot reproduce at temperatures above 18-25 degrees C. By contrast to plants in the aerial environment, photosynthetic structures in water are at essentially the same temperature as the fluid medium. The impact of low temperatures on photosynthesis by marine macrophytes is predicted to favour diffusive CO(2) entry rather than a CO(2)-concentrating mechanism. Some evidence favours this suggestion, but more data are needed.
Environmental controls on the nitrogen-fixing cyanobacterium Nodularia spumigena in a temperate lagoon system in SE Australia
Publisher: Inter-Research Science Center
Date: 28-09-2012
DOI: 10.3354/MEPS09843
Significantly improved dehydrogenation of LiBH4destabilized by TiF3
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B915779D
Fourier Transform Infrared microspectroscopy and chemometrics as a tool for the discrimination of cyanobacterial strains
Publisher: Elsevier BV
Date: 10-1999
Interactions among phosphate uptake, photosynthesis, and chlorophyll fluorescence in nutrient-limited cultures of the chlorophyte microalga Dunaliella tertiolecta
Publisher: Wiley
Date: 22-05-2008
DOI: 10.1111/J.1529-8817.2008.00515.X
Abstract: Phosphate-limited and phosphate-sufficient continuous cultures of the marine chlorophyte microalga Dunaliella tertiolecta Butcher were examined for their responses to the addition of phosphate. Phosphate-limited cultures showed a marked quenching of chl fluorescence following a pulse of phosphate. This response was absent from cells growing under phosphate-sufficient conditions. Both the extent of fluorescence quenching (where present) and the initial rate of change in quenching were dependent on the concentration of phosphate added to cell suspensions and on the degree of limitation (growth rate in continuous culture). The addition of phosphate also brought about a transient decrease in photosynthetic oxygen evolution and a stimulation in respiration, which were relaxed as the added phosphate was depleted from the external medium. The applicability of using nutrient-induced fluorescence transients as a tool to identify the nutrient status of phytoplankton populations is discussed.
Improved Hydrogen Storage of LiBH4 Catalyzed Magnesium
Publisher: American Chemical Society (ACS)
Date: 08-2007
DOI: 10.1021/JP072803F
Nitrogen-containing carbon nanostructures: A promising carrier for catalysis of ammonia borane dehydrogenation
Publisher: Elsevier BV
Date: 03-2014
Erratum: Changes in pH at the exterior surface of plankton with ocean acidification
Publisher: Springer Science and Business Media LLC
Date: 27-09-2012
DOI: 10.1038/NCLIMATE1696
Light-weight solid-state hydrogen storage materials characterized by neutron scattering
Publisher: Elsevier BV
Date: 04-2022
Multiple Anionic Transition-Metal Oxycarbide for Better Lithium Storage and Facilitated Multielectron Reactions
Publisher: American Chemical Society (ACS)
Date: 11-09-2019
Abstract: As an important class of multielectron reaction materials, the applications of transition-metal oxides (TMOs) are impeded by volume expansion and poor electrochemical activity. To address these intrinsic limitations, the renewal of TMOs inspires research on incorporating an advanced interface layer with multiple anionic characteristics, which may add functionality to support properties inaccessible to a single-anion TMO electrode. Herein, a transition-metal oxycarbide (TMOC, M = Mo) with more than one anionic species was prepared as an interface layer on a corresponding oxide. A multiple anionic TMOC possesses advantages of structural stability, abundant active sites, and elevated metal cation valence states. Such merits mitigate volume changes and enhance multielectron reactions significantly. The TMOC nanocomposite has a well-maintained capacity after 1000 cycles at 2 A·g
Mapping of nutrient-induced biochemical changes in living algal cells using synchrotron infrared microspectroscopy
Publisher: Oxford University Press (OUP)
Date: 08-2005
DOI: 10.1016/J.FEMSLE.2005.06.021
Abstract: High quality Fourier transform infrared (FTIR) spectra were acquired from living Micrasterias hardyi cells maintained in an IR transparent flow-through cell using a FTIR microscope coupled to a synchrotron light source. Spectral maps of living, nutrient-replete cells showed band intensities consistent with the known location of the nucleus and the chloroplasts. These were very similar to maps acquired from fixed, air-dried cells. Bands due to lipids were lowest in absorbance in the region of the nucleus and highest in the chloroplast region and this trend was reversed for the absorbance of bands attributed to protein. Spectra acquired in 10 microm steps across living phosphorus-starved (P-starved) cells, repeated approximately every 30 min, were consistent over time, and bands correlated well with the known position of the nucleus and the observed chloroplasts, corroborating the observations with replete cells. Experiments in which missing nutrients were re-supplied to starved cells showed that cells could be maintained in a functional state in the flow-through cell for up to one day. Nitrogen-starved cells re-supplied with N showed an increase in lipid in all positions measured across the cell over a 23 h period of re-supply, with the largest increases occurring in positions where the chloroplasts were observed. Re-supply of phosphorus to P-starved cells produced no changes in bands attributable to lipid or protein. Due to their thin cell body ( approximately 12 microm) and large diameter ( approximately 300 microm) Micrasterias sp. make an ideal spectroscopic model to study nutrient kinetics in algal cells.
Effects of SiC nanoparticles with and without Ni on the hydrogen storage properties of MgH2
Publisher: Elsevier BV
Date: 09-2009
Ocean acidification modulates expression of genes and physiological performance of a marine diatom
Publisher: Copernicus GmbH
Date: 24-09-2015
DOI: 10.5194/BGD-12-15809-2015
Abstract: Abstract. Ocean Acidification (OA) is known to affect various aspects of the physiological performance of diatoms, but there is little information on the underlining molecular mechanisms involved. Here, we show that in the model diatom Phaeodactylum tricornutum expression of the genes related to light harvesting, carbon acquisition and carboxylation, nitrite assimilation and ATP synthesis are modulated by OA. Growth and photosynthetic carbon fixation were enhanced by elevated CO2 (1000 μatm) under both constant indoor and fluctuating outdoor light regimes. The genetic expression of nitrite reductase (NiR) was up-regulated by OA regardless of light levels and/or regimes. The transcriptional expression of fucoxanthin chlorophyll a/c protein (lhcf type (FCP)) and mitochondrial ATP synthase (mtATP synthase) genes were also enhanced by OA, but only under high light intensity. OA treatment decreased the expression of β-carbonic anhydrase (β-CA) along with down-regulation of CO2 concentrating mechanisms (CCMs). Additionally, the genes for these proteins (NiR, FCP, mtATP synthase, β-CA) showed diel expressions either under constant indoor light or fluctuating sunlight. Thus, OA enhanced photosynthetic and growth rates by stimulating nitrogen assimilation and indirectly by down-regulating the energy-costly inorganic carbon acquisition process.
Intercolonial variability in macromolecular composition in P-starved and P-replete Scenedesmus populations revealed by infrared microspectroscopy
Publisher: Wiley
Date: 10-2008
DOI: 10.1111/J.1529-8817.2008.00564.X
Abstract: Macromolecular variability in microalgal populations subject to different nutrient environments was investigated, using the chlorophyte alga Scenedesmus quadricauda (Turpin) Bréb. as a model organism. The large size of the four-cell coenobia in the strain used in this study (∼35 μm diameter) conveniently allowed high quality spectra to be obtained from in idual coenobia using a laboratory-based Fourier transform infrared (FTIR) microscope with a conventional globar source of IR. By drawing sizable subpopulations of coenobia from two Scenedesmus cultures grown under either nutrient-replete or P-starved conditions, the population variability in macromolecular composition, and the effects of nutrient change upon this, could be estimated. On average, P-starved coenobia had higher carbohydrate and lower protein absorbance compared with P-replete coenobia. These parameters varied between coenobia with histograms of the ratio of absorbance of the largest protein and carbohydrate bands being Gaussian distributed. Distributions for the P-replete and P-starved subpopulations were nonoverlapping, with the difference in mean ratios for the two populations being statistically significant. Greater variance was observed in the P-starved subpopulation. In addition, multivariate models were developed using the spectral data, which could accurately predict the nutrient status of an independent in idual coenobium, based on its FTIR spectrum. Partial least squares discriminant analysis (PLS-DA) was a better prediction method compared with soft independent modeling by class analogy (SIMCA).
Graphene-tailored molecular bonds for advanced hydrogen and lithium storage performance
Publisher: Elsevier BV
Date: 02-2019
Effects of pre-processing of Raman spectra on in vivo classification of nutrient status of microalgal cells
Publisher: Wiley
Date: 05-2006
DOI: 10.1002/CEM.990
Interactions between UV-B exposure and phosphorus nutrition. I. Effects on growth, phosphate uptake, and chlorophyll fluorescence
Publisher: Wiley
Date: 16-11-2005
Enhanced hydrogen sorption properties of Ni and Co-catalyzed MgH2
Publisher: Elsevier BV
Date: 05-2010
Enhanced hydrogen storage performances of NaBH4–MgH2 system
Publisher: Elsevier BV
Date: 06-2009
Interactive Effects of Ocean Acidification and Nitrogen-Limitation on the Diatom Phaeodactylum tricornutum
Publisher: Public Library of Science (PLoS)
Date: 07-12-2012
Effects of CNTs on the hydrogen storage properties of MgH2 and MgH2-BCC composite
Publisher: Elsevier BV
Date: 08-2010
Influence of global environmental Change on plankton
Publisher: Oxford University Press (OUP)
Date: 30-10-2021
Abstract: Much has been published on the effects of ocean acidification on plankton since the original Royal Society 2005 report. In addition to direct effects on primary production, it is clear that ocean acidification also has profound consequences for biogeochemistry. Furthermore, although ocean acidification can have direct effects of on grazers such as copepods, acidification induces changes in nutritional value of phytoplankton which can be passed on up the food chain. There has also been recognition of the complexity of the interactions between elevated CO2 and other environmental factors and this has seen an upsurge in climate change research involving multifactorial experiments. In particular, the interaction of ocean acidification with global warming resulting from the increasing greenhouse effect has been investigated. There has also been research on acidification and warming effects in inland water plankton. These, combined with novel experimental techniques and long term studies of genetic adaptation, are providing better insights to plankton biology and communities in a future world.
Phytoplankton in a changing world: cell size and elemental stoichiometry
Publisher: Oxford University Press (OUP)
Date: 28-10-2009
Nanoconfinement of lithium borohydride in Cu-MOFs towards low temperature dehydrogenation
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0DT01727B
Abstract: Successful synthesis and investigation of a new material that uses copper-metal-organic frameworks (Cu-MOFs) as the template for loading LiBH(4) are reported. The nanoconfinement of LiBH(4) in the pores of Cu-MOFs results in an interaction between LiBH(4) and Cu(2+) ions, enabling the LiBH(4)@Cu-MOFs system to achieve a much lower dehydrogenation temperature than pristine LiBH(4).
Ocean acidification and nutrient limitation synergistically reduce growth and photosynthetic performances of a green tide alga <i>Ulva linza</i>
Publisher: Copernicus GmbH
Date: 13-02-2018
DOI: 10.5194/BG-2018-1
Abstract: Abstract. Large-scale green tides have been invading the coastal zones of the western Yellow Sea annually since 2008. Meanwhile, oceans are becoming more acid due to continuous absorption of anthropogenic carbon dioxide and intensive seaweed cultivation in Chinese coastal areas is leading to severe regional nutrient limitation. However, little is known the combined effects of global and local stressors on the eco-physiology of bloom-forming algae. We cultured Ulva linza under two levels of pCO2 (400 and 1000 μatm) and four treatments of nutrient (nutrient repletion, N limitation, P limitation, and N & P limitation) to investigate the physiological responses of this green tide alga to the combination of ocean acidification and nutrient limitation. For both sporelings and adult plants, elevated pCO2 did not affect the growth rate when cultured under nutrient replete conditions but reduced it under P limitation N or P limitation by themselves reduced growth rate. P limitation resulted in a larger inhibition in growth for sporelings compared to adult plants. Sporelings under P limitation did not reach the mature stage after 16 days of culture while those under P repletion became mature by day 11. Elevated pCO2 reduced net photosynthetic rate for all nutrient treatments but increased nitrate reductase activity and soluble protein content under P replete conditions. N or P limitation reduced nitrate reductase activity and soluble protein content. These findings indicate that ocean acidification and nutrient limitation would synergistically reduce the growth of Ulva species and may thus hinder the occurrence of green tides in a future ocean environment.
Synthesis of catalyzed magnesium hydride with low absorption/desorption temperature
Publisher: Elsevier BV
Date: 09-2009
Changes in chlorophyll fluorescence during exposure of Dunaliella tertiolecta to UV radiation indicate a dynamic interaction between damage and repair processes
Publisher: Springer Science and Business Media LLC
Date: 2000
Carbon dioxide as the exogenous inorganic carbon source forBatrachospermumandLemanea
Publisher: Informa UK Limited
Date: 06-1981
High-Performance Hydrogen Storage Nanoparticles Inside Hierarchical Porous Carbon Nanofibers with Stable Cycling
Publisher: American Chemical Society (ACS)
Date: 05-2017
Abstract: An effective route based on space-confined chemical reaction to synthesize uniform Li
Phagotrophy in the origins of photosynthesis in eukaryotes and as a complementary mode of nutrition in phototrophs: relation to Darwin's insectivorous plants
Publisher: Oxford University Press (OUP)
Date: 18-09-2009
DOI: 10.1093/JXB/ERP282
Abstract: Darwin performed innovative observational and experimental work on the apparently paradoxical occurrence of carnivory in photosynthetic flowering plants. The nutritional use of particulate organic material which also supplies other elements is now known to be widespread in free-living algae as well as in organisms with endosymbiotic algae and with kleptoplastids. In addition to this direct nutritional role, phagotrophy, in the broad sense of internalization of photosynthetic organisms by a eukaryote, is essential for the occurrence of present-day endosymbiotic algae and kleptoplastid-containing protists, and was essential for the origin of plastids themselves. The endosymbiotic phenomena involving photosynthetic organisms clearly played a major role in combining genomes providing different metabolic functions, but, in our opinion, this does not demand a re-appraisal of evolution by natural selection. That the balance of physiological optimization for competition for resources and minimization of losses (e.g. through predation) is a fine one, and thus subject to a complex selective process, is illustrated by the ersity of mixotrophic strategies in extant phytoplankton.
Ultraviolet radiation has no effect on respiratory oxygen consumption or enhanced post-illumination respiration in three species of microalgae
Publisher: Elsevier BV
Date: 11-2002
DOI: 10.1016/S1011-1344(02)00380-9
Abstract: A 30-min exposure to UV-B radiation (1.1 Wm(-2), unweighted) from a xenon arc l caused pronounced inhibition (33-78%) of net photosynthetic oxygen production in three species of microalgae, Phaeodactylum tricornutum Bohlin, Dunaliella tertiolecta Butcher and Wolozynskia sp., however, no statistical differences (t-test, alpha=0.05) in dark-respiration rates were found between the control group and the UV-treated group, for any of the species tested. These results indicate: (i) that the respiratory processes responsible for oxygen consumption do not sustain any appreciable impairment registered in the first half-hour after ultraviolet radiation (UVR) exposure and (ii) any change in respiration that may occur in response to increased repair demands is not detected in this period. Dark-respiration rates were observed to be significantly higher in all species tested (17-29% t-test, alpha=0.05) following illumination with photosynthetically active radiation, compared to dark-respiration before illumination. This increase, interpreted as enhanced post-illumination respiration (EPIR), was observed in all three species. The magnitude of this increase was not affected by prior exposure to UVR.
Inorganic carbon acquisition by two Antarctic macroalgae, Porphyra endiviifolium (Rhodophyta: Bangiales) and Palmaria decipiens (Rhodophyta: Palmariales)
Publisher: Springer Science and Business Media LLC
Date: 22-04-1999
Effects of NbF5 addition on the hydrogen storage properties of LiAlH4
Publisher: Elsevier BV
Date: 03-2010
Temporal transcriptome profiling of Microchloropsis gaditana CCMP526 under hyper-saline conditions
Publisher: Cold Spring Harbor Laboratory
Date: 09-06-2020
DOI: 10.1101/2020.06.07.139238
Abstract: Microalgae can tolerate a wide range of environmental conditions and have been exploited for their lipid and carbohydrate accumulating properties. The utility of this process could be further enhanced through understanding the critical gene regulatory networks that govern the acclimatization process. Advancements in systems biology and sequencing tools now enable us to obtain a genome-wide overview of gene expression under particular conditions of interest. Under salinity stress, Microchloropsis gaditana CCMP526, a commercially important alga has been previously reported to accumulate carbohydrate and lipid. To understand the mechanism of acclimatization, here we report a temporal transcriptomic analysis of M. gaditana under two different salinity levels (55 and 100 PSU). The short term (0, 1 and 6 h) and long term (24 and 72 h) responses of the salt-induced transcript pool were used to identify salinity-inducible genes using correspondence analysis. The transcript abundance of genes involved in triacylglycerol biosynthesis, membrane lipid modification, carbon assimilation and shunting, and osmolyte biosynthesis indicated that M. gaditana employs a two-stage acclimatization strategy during hypersaline conditions.
Effect of UV radiation on growth, chlorophyll fluorescence and fatty acid composition of Phaeodactylum tricornutum and Chaetoceros muelleri (Bacillariophyceae)
Publisher: Informa UK Limited
Date: 11-2006
DOI: 10.2216/04-61.1
A red tide alga grown under ocean acidification upregulates its tolerance to lower pH by increasing its photophysiological functions
Publisher: Copernicus GmbH
Date: 11-09-2014
Abstract: Abstract. Phaeocystis globosa, a red tide alga, often forms blooms in or adjacent to coastal waters and experiences changes in pH and seawater carbonate chemistry caused by either diel eriodic fluctuation in biological activity, human activity or, in the longer term, ocean acidification due to atmospheric CO2 rise. We examined the photosynthetic physiology of this species while growing it under different pH levels induced by CO2 enrichment and investigated its acclimation to carbonate chemistry changes under different light levels. Short-term exposure to reduced pHnbs (7.70) decreased the alga's photosynthesis and light use efficiency. However, acclimation to the reduced pH level for 1–19 generations led to recovered photosynthetic activity, being equivalent to that of cells grown under pH 8.07 (control), though such acclimation required a different time span (number of generations) under different light regimes. The low-pH-grown cells increased their contents of chlorophyll and carotenoids with prolonged acclimation to the acidification, with increased photosynthetic quantum yield and decreased non-photochemical quenching. The specific growth rate of the low-pH-grown cells also increased to emulate that grown under the ambient pH level. This study clearly shows that \\\\textit{Phaeocystis globosa} is able to acclimate to seawater acidification by increasing its energy capture and decreasing its non-photochemical energy loss.
Algal evolution in relation to atmospheric CO 2: Carboxylases, carbon-concentrating mechanisms and carbon oxidation cycles
Publisher: The Royal Society
Date: 19-02-2012
Abstract: Oxygenic photosynthesis evolved at least 2.4 Ga all oxygenic organisms use the ribulose bisphosphate carboxylase-oxygenase (Rubisco)–photosynthetic carbon reduction cycle (PCRC) rather than one of the five other known pathways of autotrophic CO 2 assimilation. The high CO 2 and (initially) O 2 -free conditions permitted the use of a Rubisco with a high maximum specific reaction rate. As CO 2 decreased and O 2 increased, Rubisco oxygenase activity increased and 2-phosphoglycolate was produced, with the evolution of pathways recycling this inhibitory product to sugar phosphates. Changed atmospheric composition also selected for Rubiscos with higher CO 2 affinity and CO 2 /O 2 selectivity correlated with decreased CO 2 -saturated catalytic capacity and/or for CO 2 -concentrating mechanisms (CCMs). These changes increase the energy, nitrogen, phosphorus, iron, zinc and manganese cost of producing and operating Rubisco–PCRC, while biosphere oxygenation decreased the availability of nitrogen, phosphorus and iron. The majority of algae today have CCMs the timing of their origins is unclear. If CCMs evolved in a low-CO 2 episode followed by one or more lengthy high-CO 2 episodes, CCM retention could involve a combination of environmental factors known to favour CCM retention in extant organisms that also occur in a warmer high-CO 2 ocean. More investigations, including studies of genetic adaptation, are needed.
Heterocarbides Reinforced Electrochemical Energy Storage
Publisher: Wiley
Date: 17-09-2019
Abstract: The feasibility of transition metal carbides (TMCs) as promising high-rate electrodes is still hindered by low specific capacity and sluggish charge transfer kinetics. Improving charge transport kinetics motivates research toward directions that would rely on heterostructures. In particular, heterocomposing with carbon-rich TMCs is highly promising for enhancing Li storage. However, due to limited synthesis methods to prepare carbon-rich TMCs, understanding the interfacial interaction effect on the high-rate performance of TMCs is often neglected. In this work, a novel strategy is proposed to construct a binary carbide heteroelectrode, i.e. incorporating the carbon-rich TMC (M=Mo) with its metal-rich TMC nanowires (nws) via an ingenious in situ disproportionation reaction. Results show that the as-prepared MoC-Mo
Enhancement of diatom growth and phytoplankton productivity with reduced O2 availability is moderated by rising CO2
Publisher: Springer Science and Business Media LLC
Date: 14-01-2022
DOI: 10.1038/S42003-022-03006-7
Abstract: Many marine organisms are exposed to decreasing O 2 levels due to warming-induced expansion of hypoxic zones and ocean deoxygenation (DeO 2 ). Nevertheless, effects of DeO 2 on phytoplankton have been neglected due to technical bottlenecks on examining O 2 effects on O 2 -producing organisms. Here we show that lowered O 2 levels increased primary productivity of a coastal phytoplankton assemblage, and enhanced photosynthesis and growth in the coastal diatom Thalassiosira weissflogii . Mechanistically, reduced O 2 suppressed mitochondrial respiration and photorespiration of T. weissflogii , but increased the efficiency of their CO 2 concentrating mechanisms (CCMs), effective quantum yield and improved light use efficiency, which was apparent under both ambient and elevated CO 2 concentrations leading to ocean acidification (OA). While the elevated CO 2 treatment partially counteracted the effect of low O 2 in terms of CCMs activity, reduced levels of O 2 still strongly enhanced phytoplankton primary productivity. This implies that decreased availability of O 2 with progressive DeO 2 could boost re-oxygenation by diatom-dominated phytoplankton communities, especially in hypoxic areas, with potentially profound consequences for marine ecosystem services in coastal and pelagic oceans.
Molecular-Scale Functionality on Graphene To Unlock the Energy Capabilities of Metal Hydrides for High-Capacity Lithium-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 31-07-2018
Abstract: Metal hydrides have attracted great intentions as anodes for lithium-ion batteries (LIBs) due to their extraordinary theoretical capacity. It is an unsolved challenge, however, to achieve high capacity with stable cyclability, owing to their insulating property and large volume expansion upon lithium storage. Here, we introduce self-initiated polymerization to realize molecular-scale functionality of metal hydrides with conductive polymer, that is, polythiophene (PTh), on graphene, leading to the formation of MgH
Ocean acidification and nutrient limitation synergistically reduce growth and photosynthetic performances of a green tide alga <i>Ulva linza</i>
Publisher: Copernicus GmbH
Date: 11-06-2018
Abstract: Abstract. Large-scale green tides have been invading the coastal zones of the western Yellow Sea annually since 2008. Meanwhile, oceans are becoming more acidic due to continuous absorption of anthropogenic carbon dioxide, and intensive seaweed cultivation in Chinese coastal areas is leading to severe regional nutrient limitation. However, little is known about the combined effects of global and local stressors on the eco-physiology of bloom-forming algae. We cultured Ulva linza for 9–16 days under two levels of pCO2 (400 and 1000 µatm) and four treatments of nutrients (nutrient repletion, N limitation, P limitation, and N–P limitation) to investigate the physiological responses of this green tide alga to the combination of ocean acidification and nutrient limitation. For both sporelings and adult plants, elevated pCO2 did not affect the growth rate when cultured under nutrient-replete conditions but reduced it under P limitation N or P limitations by themselves reduced growth rate. P limitation resulted in a larger inhibition in growth for sporelings compared to adult plants. Sporelings under P limitation did not reach the mature stage after 16 days of culture while those under P repletion became mature by day 11. Elevated pCO2 reduced net photosynthetic rate for all nutrient treatments but increased nitrate reductase activity and soluble protein content under P-replete conditions. N or P limitation reduced nitrate reductase activity and soluble protein content. These findings indicate that ocean acidification and nutrient limitation would synergistically reduce the growth of Ulva species and may thus hinder the occurrence of green tides in a future ocean environment.
Elevated CO2 causes changes in the photosynthetic apparatus of a toxic cyanobacterium, Cylindrospermopsis raciborskii
Publisher: Elsevier BV
Date: 07-2014
DOI: 10.1016/J.JPLPH.2014.04.003
Abstract: We studied the physiological acclimation of growth, photosynthesis and CO2-concentrating mechanism (CCM) in Cylindrospermopsis raciborskii exposed to low (present day L-CO2) and high (1300ppm H-CO2) pCO2. Results showed that under H-CO2 the cell specific ision rate (μc) was higher and the CO2- and light-saturated photosynthetic rates (Vmax and Pmax) doubled. The cells' photosynthetic affinity for CO2 (K0.5CO2) was halved compared to L-CO2 cultures. However, no significant differences were found in dark respiration rates (Rd), pigment composition and light harvesting efficiency (α). In H-CO2 cells, non-photochemical quenching (NPQ), associated with state transitions of the electron transport chain (ETC), was negligible. Simultaneously, a reorganisation of PSII features including antenna connectivity (JconPSIIα), heterogeneity (PSIIα/β) and effective absorption cross sectional area (σPSIIα/β) was observed. In relation to different activities of the CCM, our findings suggest that for cells grown under H-CO2: (1) there is down-regulation of CCM activity (2) the ability of cells to use the harvested light energy is altered (3) the occurrence of state transitions is likely to be associated with changes of electron flow (cyclic vs linear) through the ETC (4) changes in PSII characteristics are important in regulating state transitions.
Measurement of DIC acquisition and evidence for a CO2 concentrating mechanism in Gephyrocapsa oceanica (Isochrysidales, Coccolithophyceae)
Publisher: Informa UK Limited
Date: 05-12-2023
Modification of fatty acid composition in halophilic Antarctic microalgae
Publisher: Elsevier BV
Date: 11-1998
Synthesis and hydrogen release properties of alkyl-substituted amine-boranes
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01631A
Abstract: Three newly synthesized alkyl-substituted amine-boranes show a favorable dehydrogenation rate with pure hydrogen release.
Carbon‐Coated Li3N Nanofibers for Advanced Hydrogen Storage
Publisher: Wiley
Date: 21-08-2013
Abstract: 3D porous carbon-coated Li3 N nanofibers are successfully fabricated via the electrospinning technique. The as-prepared nanofibers exhibit a highly improved hydrogen-sorption performance in terms of both thermodynamics and kinetics. More interestingly, a stable regeneration can be achieved due to the unique structure of the nanofibers, over 10 cycles of H2 sorption at a temperature as low as 250 °C.
Regulation of inorganic carbon acquisition by phosphorus limitation in the green alga Chlorella emersonii
Publisher: Canadian Science Publishing
Date: 07-2005
DOI: 10.1139/B05-070
Abstract: Inorganic phosphate (P i ) plays a central role in cellular energy transduction. As a consequence, limitation of growth by phosphate availability can have an important impact on various aspects of metabolism. Since carbon acquisition via CO 2 -concentrating mechanisms (CCMs) in most microalgae is an active process, requiring ATP, it might be expected that phosphate limitation could have an indirect regulatory influence on CCM activity. We grew the green alga Chlorella emersonii Shihira et Krauss in semicontinuous or continuous cultures in nutrient-replete conditions or with orthophosphate as the limiting nutrient. CCM activity was down-regulated by P limitation. K 0.5 (dissolved inorganic carbon) values increased from approximately 4.5 µmol·L 1 in cells growing at close to maximal rates to µmol·L 1 in cells growing at 0.2 d 1 . Maximal rates of photosynthesis decreased by approximately half over the same range of growth rates. Direct measurements of CCM activity showed that internal CO 2 : external CO 2 ratio was markedly decreased under P limitation, and concurrent measurements of stable carbon isotope discrimination were consistent with decreased CCM activity in the P-limited cells.Key words: phosphate, CCM, CO 2 -concentrating mechanism, Chlorella, inorganic carbon acquisition.
Enhanced hydrogen storage performance of LiAlH4–MgH2–TiF3 composite
Publisher: Elsevier BV
Date: 05-2011
Algae lacking carbon-concentrating mechanisms
Publisher: Canadian Science Publishing
Date: 07-2005
DOI: 10.1139/B05-074
Abstract: Most of the algae and cyanobacteria that have been critically examined express a carbon-concentrating mechanism (CCM) when grown at, or below, the current atmospheric CO 2 concentration. This paper considers algae that appear to lack a CCM. Critical examination of the evidence on which the presence or absence of a CCM is decided shows that more information is frequently needed before the criteria can be fully applied. Ex les are the pathways of glycolate metabolism in nongreen algae, and the 13 C/ 12 C discrimination shown by form ID Rubisco in vitro. The available evidence suggests that the algae lacking CCMs are some terrestrial green microalgae, some florideophyte freshwater red macroalgae, and a number of florideophyte red macroalgae from the supralittoral, littoral, and sublittoral, and almost all of the freshwater chrysophytes and synurophytes examined. Certain environmental, biochemical, and biophysical factors may permit the occurrence of algae lacking CCMs. The absence of CCMs is presumably the plesiomorphic (i.e., ancestral) condition in cyanobacteria (and algae?).Key words: CO 2 diffusion, chrysophyte algae, ecology, evolution, green algae, photosynthesis, red algae.
Heterostructure Manipulation toward Ameliorating Electrodes for Better Lithium Storage Capability
Publisher: American Chemical Society (ACS)
Date: 16-10-2018
Amminelithium Amidoborane Li(NH3)NH2BH3: A New Coordination Compound with Favorable Dehydrogenation Characteristics
Publisher: Wiley
Date: 16-03-2010
Abstract: The monoammoniate of lithium amidoborane, Li(NH(3))NH(2)BH(3), was synthesized by treatment of LiNH(2)BH(3) with ammonia at room temperature. This compound exists in the amorphous state at room temperature, but at -20 degrees C crystallizes in the orthorhombic space group Pbca with lattice parameters of a = 9.711(4), b = 8.7027(5), c = 7.1999(1) A, and V = 608.51 A(3). The thermal decomposition behavior of this compound under argon and under ammonia was investigated. Through a series of experiments we have demonstrated that Li(NH(3))NH(2)BH(3) is able to absorb/desorb ammonia reversibly at room temperature. In the temperature range of 40-70 degrees C, this compound showed favorable dehydrogenation characteristics. Specifically, under ammonia this material was able to release 3.0 equiv hydrogen (11.18 wt %) rapidly at 60 degrees C, which represents a significant advantage over LiNH(2)BH(3). It has been found that the formation of the coordination bond between ammonia and Li(+) in LiNH(2)BH(3) plays a crucial role in promoting the combination of hydridic B-H bonds and protic N-H bonds, leading to dehydrogenation at low temperature.
Improved dehydrogenation properties of the combined Mg(BH4)2·6NH3–nNH3BH3 system
Publisher: Elsevier BV
Date: 12-2013
A review of existing and potential blue carbon contributions to climate change mitigation in the Anthropocene
Publisher: Wiley
Date: 27-04-2022
Abstract: The atmospheric concentration of CO 2 is steadily increasing and causing climate change. To achieve the Paris 1.5 or 2°C target, negative emission technologies must be deployed in addition to reducing carbon emissions. The ocean is a large carbon sink but the potential of marine primary producers to contribute to carbon neutrality remains unclear. Here we review the alterations to carbon capture and sequestration of marine primary producers (including traditional ‘blue carbon’ plants, microalgae and macroalgae) in the Anthropocene, and, for the first time, assess and compare the potential of various marine primary producers to carbon neutrality and climate change mitigation via biogeoengineering approaches. The contributions of marine primary producers to carbon sequestration have been decreasing in the Anthropocene due to the decrease in biomass driven by direct anthropogenic activities and climate change. The potential of blue carbon plants (mangroves, saltmarshes and seagrasses) is limited by the available areas for their revegetation. Microalgae appear to have a large potential due to their ubiquity but how to enhance their carbon sequestration efficiency is very complex and uncertain. On the other hand, macroalgae can play an essential role in mitigating climate change through extensive offshore cultivation due to higher carbon sequestration capacity and substantial available areas. This approach seems both technically and economically feasible due to the development of offshore aquaculture and a well‐established market for macroalgal products. Synthesis and applications . This paper provides new insights and suggests promising directions for utilizing marine primary producers to achieve the Paris temperature target. We propose that macroalgae cultivation can play an essential role in attaining carbon neutrality and climate change mitigation, although its ecological impacts need to be assessed further.
Spatio-temporal variability in the photosynthetic characteristics of Zostera tasmanica measured by PAM
Publisher: Elsevier BV
Date: 07-2006
Current understanding and challenges for aquatic primary producers in a world with rising micro- and nano-plastic levels
Publisher: Elsevier BV
Date: 03-2021
Inorganic C-sources for Lemanea, Cladophora and Ranunculus in a fast-flowing stream: Measurements of gas exchange and of carbon isotope ratio and their ecological implications
Publisher: Springer Science and Business Media LLC
Date: 04-1982
DOI: 10.1007/BF00377138
Highly reversible lithium storage in uniform Li4Ti5O12/carbon hybrid nanowebs as anode material for lithium-ion batteries
Publisher: Elsevier BV
Date: 06-2013
A portable Raman acoustic levitation spectroscopic system for the identification and environmental monitoring of algal cells
Publisher: American Chemical Society (ACS)
Date: 21-06-2005
DOI: 10.1021/AC050281Z
Abstract: We report the coupling of a portable Raman spectrometer to an acoustic levitation device to enable environmental monitoring and the potential taxonomic identification of microalgae. Spectra of living cells were recorded at 785 nm using a fiber-optic probe coupled to a portable Raman spectrometer. The spectra exhibit an excellent signal-to-noise ratio and clearly show bands from chlorophyll a and beta-carotene. Spectra of levitated photobleached microalgae clearly show a reduction in chlorophyll a concentration relative to beta-carotene after 10 min of exposure to a quartz halogen l . Spectra recorded from levitated nitrogen-limited cells also show a significant reduction in bands associated with chlorophyll a, as compared to nitrogen-replete cells. To investigate the diagnostic capability of the technique, four species of microalgae were analyzed. Good quality spectra of all four species were obtained showing varying ratios of beta-carotene to chlorophyll. The combination of an acoustic levitation device and a portable Raman spectrometer shows potential as a taxonomic and environmental monitoring tool with direct application to field studies in remote environments.
Distribution and spatial variation of benthic microalgal biomass in a temperate, shallow-water marine system
Publisher: Elsevier BV
Date: 05-1998
Publisher: Science Society of Thailand
Date: 2006
Put out the light, and then put out the light
Publisher: Cambridge University Press (CUP)
Date: 02-2000
DOI: 10.1017/S0025315499001526
Abstract: The lowest photon flux density of photosynthetically active radiation at which O 2 -evolving marine photolithotrophs appear to be able to grow is some 10 nmol photon m −2 s −1 , while marine non-O 2 -evolvers can grow at 4 nmol photon m −2 s −1 , in both cases with the photon flux density averaged over the 24 hour L:D cycle. Constraints on the ability to grow at very low fluxes of photosynthetically active radiation fall into three categories. Category one includes essential processes whose efficiency is independent of the rate of energy input, but whose catalysts show phylogenetic variation leading to different energy costs for a given process in different taxa, e.g. light-harvesting complexes, RUBISCO and probably in the sensitivity of PsII to photodamage. The second category comprises essential processes whose efficiency decreases with decreasing energy input rate as a result of back-reactions independent of the energy input rate, e.g. charge recombination following charge separation by PsII and short-circuit H + fluxes across the thylakoid membrane which decrease the fraction of pumped H + which can be used in adenosine diphosphate phosphorylation. Category two also includes that component of protein turnover which cannot be related to replacement of polypeptides which were incorrectly assembled following uncorrected errors of transcription or translation, or which were damaged by processes whose rate increases with increasing energy input rate such as photodamage to PsII. The third category includes only O 2 -dependent damage to the D1 protein of PsII whose rate increases with a decreasing incident flux of photosynthetically active radiation. Processes in categories two and three are most likely to impose the lower limit on the photon flux density which can support photolithotrophic growth. The available literature, mainly on organisms which are not adapted to growth at very low photon flux densities, suggests that three major limitations (charge recombination in PsII, H + leakage and slippage, and protein turnover) can in idually impose lower limits in excess of 20 nmol photon m −2 s −1 on photolithotrophic growth. Furthermore, these three limitations are interactive, so that considering all three processes acting in series leads to an even higher predicted lower photon flux density limit for photolithotrophic growth.
Using macroalgae to address UN Sustainable Development goals through CO2 remediation and improvement of the aquaculture environment
Publisher: Informa UK Limited
Date: 04-03-2022
Improved hydrogen storage performance of MgH2–NaAlH4 composite by addition of TiF3
Publisher: Elsevier BV
Date: 05-2012
Boron and nitrogen co-doped porous carbon nanotubes webs as a high-performance anode material for lithium ion batteries
Publisher: Elsevier BV
Date: 08-2016
Limitations on microalgal growth at very low photon fluence rates: The role of energy slippage
Publisher: Springer Science and Business Media LLC
Date: 12-05-2006
DOI: 10.1007/S11120-006-9052-1
Abstract: The lower limits of photosynthetically useable radiation at which growth and photosynthesis can occur establish the lower boundaries for the extent of photolithotrophy in the biosphere. Photolithotrophic growth denotes the capacity to grow with photons as the sole energy input. Slippage in terms of photosynthetic energy conversion implies a less than theoretical stoichiometry of energy-transduction process(es) such as the dissipation of intermediates of O(2) evolution and of ATP synthesis (H(+)/e(-) and H(+)/ATP ratios). Slippage is particularly important in limiting the growth of photolithotrophic organisms at very low photon fluence rates. We found that Dunaliella tertiolecta and Phaeodactylum tricornutum avoid such reductions in photon use efficiency by increasing the size and number of their photosynthetic units, respectively, and by altering Q(A) reduction kinetics on the reducing side of PS II. P. tricornutum is also less susceptible to slippage in terms of the breakdown of intermediates in its O(2) evolution pathway than D. tertiolecta. Minimizing H(+) leakage through the CF(0)-CF(1) ATP synthetase (and other H(+ )porters) is also discussed briefly. In combination, strategies employed by P. tricornutum effectively allow it to grow and photosynthesize at lower rates of energy input than D. tertiolecta, consistent with our observations. Differences in the responses of the photosynthetic apparatus of these two marine microalgae are mechanistic and probably representative of evolutionary ergences associated with strategies for dealing with environmental perturbations.
Novel three-dimensional tin/carbon hybrid core/shell architecture with large amount of solid cross-linked micro/nanochannels for lithium ion battery application
Publisher: Elsevier BV
Date: 03-2015
Improved Hydrogen Storage Properties of NaBH4 Destabilized by CaH2 and Ca(BH4)2
Publisher: American Chemical Society (ACS)
Date: 14-04-2011
DOI: 10.1021/JP2020319
The impacts of a high CO 2 environment on a bicarbonate user: The cyanobacterium Cylindrospermopsis raciborskii
Publisher: Elsevier BV
Date: 04-2012
DOI: 10.1016/J.WATRES.2011.11.015
Abstract: The potentially toxic cyanobacterium Cylindrospermopsis raciborskii (Wołoszyńska) Seenya et Subba Raju, originally described as a tropical-subtropical species, is increasingly found in temperate regions and its range is expanding. Climate change is hypothesised to be a factor in this expansion. We studied the effects of dissolved inorganic carbon (DIC) and pH on growth and photosynthesis of this species. We prepared six treatments in a continuous culture (turbidostat) grown at high light, two at low light, and eight in batch cultures grown under low light, by manipulating pH, HCO(3)(-) and CO(2) to assess the effect, if any, of these parameters on the growth rate, inorganic carbon acquisition and photosynthetic parameters of C. raciborskii. When the turbidostats were grown at 100 μmol photons (PAR) m(-2) s(-1), HCO(3)(-) concentration and pH had a positive effect on growth rate the specific growth rate in 6 mM HCO(3)(-), for ex le, was twice what it was in 0.6 mM HCO(3)(-) (0.84 ± 0.10 and 0.44 ± 0.04 d(-1) respectively). Growth was lower in turbidostats grown at 20 μmol photons (PAR) m(-2) s(-1). Isotope disequilibrium experiments showed that the contribution of HCO(3)(-) to DIC acquisition is proportionately greater at the higher light. The maximum relative electron transport rate (rETR(max)) was significantly higher at the higher light, while the slope of the linear portion of the rETR(max) versus irradiance curve (α) was unchanged. In low light batch cultures, increasing HCO(3)(-) concentration and pH had a negative effect on growth, while CO(2) concentration had a small, positive effect. This species of cyanobacterium has an efficient CCM and under ideal growing conditions gets most of its carbon from HCO(3)(-). It may, therefore, be at a competitive disadvantage in a high CO(2) world.
Comments on bg-2019-97 by Trimborn et al
Publisher: Copernicus GmbH
Date: 16-04-2019
Well-dispersed lithium amidoborane nanoparticles through nanoreactor engineering for improved hydrogen release
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR03257H
Abstract: Well-distributed lithium amidoborane (LiAB) nanoparticles were successfully fabricated via adopting carbon nanofibers (CNFs) with homogenous pores uniformly containing Li 3 N as the nanoreactor and reactant, for the subsequent interaction with AB.
Characterising nutrient-induced fluorescence transients (NIFTs) in nitrogen-stressed Chlorella emersonii (Chlorophyta)
Publisher: Informa UK Limited
Date: 04-09-2007
DOI: 10.2216/06-55.1
Hierarchical Porous Li2Mg(NH)2@C Nanowires with Long Cycle Life Towards Stable Hydrogen Storage
Publisher: Springer Science and Business Media LLC
Date: 13-10-2014
DOI: 10.1038/SREP06599
State transitions and nonphotochemical quenching during a nutrient-induced fluorescence transient in phosphorus-starved Dunaliella tertiolecta
Publisher: Wiley
Date: 10-2008
DOI: 10.1111/J.1529-8817.2008.00585.X
Abstract: Assessments of nutrient-limitation in microalgae using chl a fluorescence have revealed that nitrogen and phosphorus depletion can be detected as a change in chl a fluorescence signal when nutrient-starved algae are resupplied with the limiting nutrient. This photokinetic phenomenon is known as a nutrient-induced fluorescence transient, or NIFT. Cultures of the unicellular marine chlorophyte Dunaliella tertiolecta Butcher were grown under phosphate starvation to investigate the photophysiological mechanism behind the NIFT response. A combination of low temperature (77 K) fluorescence, photosynthetic inhibitors, and nonphotochemical quenching analyses were used to determine that the NIFT response is associated with changes in energy distribution between PSI and PSII and light-stress-induced nonphotochemical quenching (NPQ). Previous studies point to state transitions as the likely mechanism behind the NIFT response however, our results show that state transitions are not solely responsible for this phenomenon. This study shows that an interaction of at least two physiological processes is involved in the rapid quenching of chl a fluorescence observed in P-starved D. tertiolecta: (1) state transitions to provide the nutrient-deficient cell with metabolic energy for inorganic phosphate (Pi )-uptake and (2) energy-dependent quenching to allow the nutrient-stressed cell to avoid photodamage from excess light energy during nutrient uptake.
Oxygen‐free Layer‐by‐Layer Assembly of Lithiated Composites on Graphene for Advanced Hydrogen Storage
Publisher: Wiley
Date: 25-04-2017
Effect of salinity on fatty acid composition of a green microalga from an antarctic hypersaline lake
Publisher: Elsevier BV
Date: 06-1997
Photoinhibition of the Picophytoplankter Synechococcus Is Exacerbated by Ocean Acidification
Publisher: MDPI AG
Date: 21-03-2023
DOI: 10.3390/W15061228
Abstract: The marine picocyanobacterium Synechococcus accounts for a major fraction of the primary production across the global oceans. However, knowledge of the responses of Synechococcus to changing pCO2 and light levels has been scarcely documented. Hence, we grew Synechococcus sp. CB0101 at two CO2 concentrations (ambient CO2 AC:410 μatm high CO2 HC:1000 μatm) under various light levels between 25 and 800 μmol photons m−2 s−1 for 10–20 generations and found that the growth of Synechococcus strain CB0101 is strongly influenced by light intensity, peaking at 250 μmol m−2 s−1 and thereafter declined at higher light levels. Synechococcus cells showed a range of acclimation in their photophysiological characteristics, including changes in pigment content, optical absorption cross section, and light harvesting efficiency. Elevated pCO2 inhibited the growth of cells at light intensities close to or greater than saturation, with inhibition being greater under high light. Elevated pCO2 also reduced photosynthetic carbon fixation rates under high light but had smaller effects on the decrease in quantum yield and maximum relative electron transport rates observed under increasing light intensity. At the same time, the elevated pCO2 significantly decreased particulate organic carbon (POC) and particulate organic nitrogen (PON), particularly under low light. Ocean acidification, by increasing the inhibitory effects of high light, may affect the growth and competitiveness of Synechococcus in surface waters in the future scenario.
Effects of nitrogen source and UV radiation on the growth, chlorophyll fluorescence and fatty acid composition of Phaeodactylum tricornutum and Chaetoceros muelleri (Bacillariophyceae)
Publisher: Elsevier BV
Date: 03-2006
DOI: 10.1016/J.JPHOTOBIOL.2005.11.002
Abstract: Cultures of the marine diatoms Phaeodactylum tricornutum and Chaetoceros muelleri were grown in f/2 medium supplied with either nitrate (N-Nt), ammonium (N-Am) or urea (N-Ur) as the nitrogen (N) source at the same final N concentration (0.88 mM). Exponential growth phase cultures of the two diatoms were exposed to four different light regimes for 2 days: (UVAR) PAR (60 micromol quanta m-2 s-1) plus 8.22 W m-2 (unweighted) UVAR (high UVBR) PAR (60 micromol quanta m-2 s-1) plus 1.04 W m-2 (unweighted) UVBR plus 13.73 W m-2 (unweighted) UVAR (low UVBR) PAR (60 micromol quanta m-2 s-1) plus 0.19 W m-2 (unweighted) UVBR plus 2.76 W m-2 (unweighted) UVAR and (PAR) PAR (60 micromol quanta m-2 s-1) alone (control). No significant effects of N source on the growth rates of the two diatoms were detected. The maximum effective quantum yield of PSII, PhiPSIIe-max, and the initial slope of the light curve, alpha, of P. tricornutum and C. muelleri were all inhibited, whereas Ik was somewhat increased, as a consequence of 2 days of exposure to all the UVR treatments. Multiple factor ANOVA revealed that all the major fatty acids, both in P. tricornutum and C. muelleri, were influenced more strongly by N source than by UVR. The composition of saturated fatty acids (SFA), monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) in P. tricornutum and C. muelleri exhibited almost the same pattern of variation with N source and UVR. The maximum value of SFA was found in the N-Am treatment, that of MUFA in the N-Nt treatment and for PUFA in the N-Ur treatment irrespective of the UV radiation. On the other hand, the impact of UVR resulted in an increase of PUFA and a reduction of SFA both in P. tricornutum and C. muelleri under all N sources.
Fluorescence microscopy reveals variations in cellular composition during formation of akinetes in the cyanobacterium Aphanizomenon ovalisporum
Publisher: Informa UK Limited
Date: 08-2009
Effects of lead on growth, photosynthetic characteristics and production of reactive oxygen species of two freshwater green algae
Publisher: Elsevier BV
Date: 03-2016
DOI: 10.1016/J.CHEMOSPHERE.2015.12.117
Abstract: In the natural environment, heavy metal contamination can occur as long-term pollution of sites or as pulses of pollutants from wastewater disposal. In this study two freshwater green algae, Chlorella sp. FleB1 and Scenedesmus YaA6, were isolated from lead-polluted water s les and the effects of 24 h vs 4 and 8 d exposure of cultures to lead on growth, photosynthetic physiology and production of reactive oxygen species (ROS) of these algae were investigated. In Chlorella sp. FleB1, there was agreement between lead impacts on chlorophyll content, photosynthesis and growth in most case. However, in Scenedesmus acutus YaA6 growth was inhibited at lower lead concentrations (0.03-0.87 × 10(-9) M), under which ROS, measured by 2',7' dichlorodihydrofluorescein diacetate fluorescence, were 4.5 fold higher than in controls but photosynthesis was not affected, implying that ROS had played a role in the growth inhibition that did not involve direct effects on photosynthesis. Effects of short-term (5 h, 24 h) vs long-term (4 d and 8 d) exposure to lead were also compared between the two algae. The results contribute to our understanding of the mechanisms of lead toxicity to algae.
Taxon-specific responses of Southern Ocean diatoms to Fe enrichment revealed by synchrotron radiation FTIR microspectroscopy
Publisher: Copernicus GmbH
Date: 21-05-2014
Abstract: Abstract. Photosynthesis by marine diatoms contributes substantially to global biogeochemical cycling and ecosystem productivity. It is widely accepted that diatoms are extremely sensitive to changes in Fe availability, with numerous in situ experiments demonstrating rapid growth and increased export of elements (e.g. C, Si and Fe) from surface waters as a result of Fe addition. Less is known about the effects of Fe enrichment on the phenotypes of diatoms, such as associated changes in nutritional value, furthermore data on taxon-specific responses is almost non-existent. Enhanced supply of nutrient-rich waters along the coast of the subantarctic Kerguelen Island provide a valuable opportunity to examine the responses of phytoplankton to natural Fe enrichment. Here we demonstrate the use of synchrotron radiation Fourier Transform Infrared (SR-FTIR) microspectroscopy to analyse changes in the macromolecular composition of diatoms collected along the coast and plateau of Kerguelen Island, Southern Ocean. SR-FTIR microspectroscopy enabled the analysis of in idual diatom cells from mixed communities of field-collected s les, thereby providing insight into in situ taxon-specific responses in relation to changes in Fe availability. Phenotypic responses were taxon-specific in terms of intraspecific variability and changes in proteins, amino acids, phosphorylated molecules, silicate and carbohydrates. In contrast to some previous studies, silicate levels increased under Fe enrichment, in conjunction with increases in carbohydrate stores. The highly abundant taxon Fragilariopsis kerguelensis displayed a higher level of phenotypic plasticity than Pseudo-nitzschia spp., while analysis of the data pooled across all measured taxa showed different patterns in macromolecular composition compared to those for in idual taxon. This study demonstrates that taxon-specific responses to Fe enrichment may not always be accurately reflected by bulk community measurements, highlighting the need for further research into taxon-specific phenotypic responses of phytoplankton to environmental change.
Hollow-shell structured porous CoSe2 microspheres encapsulated by MXene nanosheets for advanced lithium storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9SE01271K
Abstract: Cobalt diselenide (CoSe 2 ), a representative transition-metal chalcogenide (TMC), is attracting intensive interest as an anode material for lithium ion batteries (LIBs), in view of its high specific capacity based on the conversion reaction mechanism.
TiO2(B)@anatase hybrid nanowires with highly reversible electrochemical performance
Publisher: Elsevier BV
Date: 2011
Hydrogen Storage Properties of Mg-BCC Composite
Publisher: Informa UK Limited
Date: 10-12-2009
The concept of light intensity adaptation in marine phytoplankton: Some experiments with Phaeodactylum tricornutum
Publisher: Springer Science and Business Media LLC
Date: 1976
DOI: 10.1007/BF00387494
High copper and UVR synergistically reduce the photochemical activity in the marine diatom Skeletonema costatum
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.JPHOTOBIOL.2019.01.016
Abstract: Many coastal waters are threatened by heavy metal pollution, of which copper (Cu) is one of the most common contaminants. Since surface waters in marine environments and ecosystems contaminated with heavy metals are concurrently exposed to solar ultraviolet radiation (UVR), marine phytoplankton may be stressed by the combination of heavy metals and UVR. In this study, three Cu concentrations (0, 0.5, and 2 μM) and two light conditions: PAR (photosynthetically active radiation, 400-700 nm) and PAB (PAR + UVR, 280-700 nm), were applied to investigate the combined effects on the photosynthetic performance of a marine diatom Skeletonema costatum. The effects on the photosynthetic performance were examined using effective photochemical yields, non-photochemical quenching, the relative UV inhibition on photosystem II (PSII), and the rates of damage and repair to PSII in response to the stressors. Results showed that UVR interacted with Cu more strongly than PAR, and synergistically decreased the photochemical performance of PSII. The contrasting responses to PAR and UVR were primarily ascribed to the repair processes of PSII. Under copper exposure, especially for s les also exposed to UVR, the repair rates were remarkably lower than those under the control (zero Cu addition). This study indicates that the human-induced pollution in coastal water, could have more severe impacts when combined with the stress induced by UVR.
Cell size influences inorganic carbon acquisition in artificially selected phytoplankton
Publisher: Wiley
Date: 19-12-2020
DOI: 10.1111/NPH.17068
Abstract: Cell size influences the rate at which phytoplankton assimilate dissolved inorganic carbon (DIC), but it is unclear whether volume‐specific carbon uptake should be greater in smaller or larger cells. On the one hand, Fick’s Law predicts smaller cells to have a superior diffusive CO 2 supply. On the other, larger cells may have greater scope to invest metabolic energy to upregulate active transport per unit area through CO 2 ‐concentrating mechanisms (CCMs). Previous studies have focused on among‐species comparisons, which complicates disentangling the role of cell size from other covarying traits. In this study, we investigated the DIC assimilation of the green alga Dunaliella tertiolecta after using artificial selection to evolve a 9.3‐fold difference in cell volume. We compared CO 2 affinity, external carbonic anhydrase (CA ext ), isotopic signatures (δ 13 C) and growth among size‐selected lineages. Evolving cells to larger sizes led to an upregulation of CCMs that improved the DIC uptake of this species, with higher CO 2 affinity, higher CA ext and higher δ 13 C. Larger cells also achieved faster growth and higher maximum biovolume densities. We showed that evolutionary shifts in cell size can alter the efficiency of DIC uptake systems to influence the fitness of a phytoplankton species.
Reversible Hydrogen Storage Performance of 2LiBH4-MgH2 Enabled by Dual Metal Borides
Publisher: American Chemical Society (ACS)
Date: 29-08-2022
Algal and aquatic plant carbon concentrating mechanisms in relation to environmental change
Publisher: Springer Science and Business Media LLC
Date: 16-02-2011
DOI: 10.1007/S11120-011-9632-6
Abstract: Carbon dioxide concentrating mechanisms (also known as inorganic carbon concentrating mechanisms both abbreviated as CCMs) presumably evolved under conditions of low CO(2) availability. However, the timing of their origin is unclear since there are no sound estimates from molecular clocks, and even if there were, there are no proxies for the functioning of CCMs. Accordingly, we cannot use previous episodes of high CO(2) (e.g. the Palaeocene-Eocene Thermal Maximum) to indicate how organisms with CCMs responded. Present and predicted environmental change in terms of increased CO(2) and temperature are leading to increased CO(2) and HCO(3)(-) and decreased CO(3)(2-) and pH in surface seawater, as well as decreasing the depth of the upper mixed layer and increasing the degree of isolation of this layer with respect to nutrient flux from deeper waters. The outcome of these forcing factors is to increase the availability of inorganic carbon, photosynthetic active radiation (PAR) and ultraviolet B radiation (UVB) to aquatic photolithotrophs and to decrease the supply of the nutrients (combined) nitrogen and phosphorus and of any non-aeolian iron. The influence of these variations on CCM expression has been examined to varying degrees as acclimation by extant organisms. Increased PAR increases CCM expression in terms of CO(2) affinity, whilst increased UVB has a range of effects in the organisms examined little relevant information is available on increased temperature. Decreased combined nitrogen supply generally increases CO(2) affinity, decreased iron availability increases CO(2) affinity, and decreased phosphorus supply has varying effects on the organisms examined. There are few data sets showing interactions amongst the observed changes, and even less information on genetic (adaptation) changes in response to the forcing factors. In freshwaters, changes in phytoplankton species composition may alter with environmental change with consequences for frequency of species with or without CCMs. The information available permits less predictive power as to the effect of the forcing factors on CCM expression than for their overall effects on growth. CCMs are currently not part of models as to how global environmental change has altered, and is likely to further alter, algal and aquatic plant primary productivity.
Using marine macroalgae for carbon sequestration: A critical appraisal
Publisher: Springer Science and Business Media LLC
Date: 19-10-2011
Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis
Publisher: Elsevier BV
Date: 09-2011
Increased genetic diversity loss and genetic differentiation in a model marine diatom adapted to ocean warming compared to high CO2
Publisher: Springer Science and Business Media LLC
Date: 10-08-2022
Graphene‐Tailored Thermodynamics and Kinetics to Fabricate Metal Borohydride Nanoparticles with High Purity and Enhanced Reversibility
Publisher: Wiley
Date: 15-01-2018
Evolution of Phytoplankton in Relation to Their Physiological Traits
Publisher: MDPI AG
Date: 31-01-2022
DOI: 10.3390/JMSE10020194
Abstract: Defining the physiological traits that characterise phytoplankton involves comparison with related organisms in benthic habitats. Comparison of survival time in darkness under natural conditions requires more information. Gas vesicles and flagella as mechanisms of upward movement relative to surrounding water, allowing periodic vertical migration, are not confined to plankton, although buoyancy changes related to compositional changes of a large central vacuole may be restricted to plankton. Benthic microalgae have the same range of photosynthetic pigments as do phytoplankton it is not clear if there are differences in the rate of regulation and acclimation of photosynthetic machinery to variations in irradiance for phytoplankton and for microphytobenthos. There are inadequate data to determine if responses to variations in frequency or magnitude of changes in the supply of inorganic carbon, nitrogen or phosphorus differ between phytoplankton and benthic microalgae. Phagophotomixotrophy and osmophotomixotrophy, occur in both phytoplankton and benthic microalgae. Further progress in identifying physiological traits specific to phytoplankton requires more experimentation on benthic microalgae that are closely related to planktonic microalgae, with attention to whether the benthic algae examined have, as far as can be determined, never been planktonic during their evolution or are derived from planktonic ancestors.
Environmental regulation of CO2-concentrating mechanisms in microalgae
Publisher: Canadian Science Publishing
Date: 06-1998
DOI: 10.1139/B98-079
Abstract: Most microalgae possess a mechanism for actively transporting inorganic carbon that concentrates CO 2 at the active site of the carbon fixing enzyme ribulose bisphosphate carboxylase-oxygenase (Rubisco). This review considers the effects of environmental factors on the capacity and activity of microalgal CO 2 -concentrating mechanisms. Limitation of energy supply by light availability decreases the rate of inorganic carbon transport and cells grown under light-limited conditions have a reduced capacity for CO 2 accumulation. Phosphorus limitation also reduces the capacity of algal cells to accumulate CO 2 , whereas both the rate of supply of nitrogen and the form in which it is made available interact in various complex ways with carbon utilization. The potential role of other nutrients in modulating inorganic carbon transport is also discussed. The capacity of algae for carbon accumulation is also affected by CO 2 supply, which, in turn, is a function of the interactions between ionic strength of the growth medium, pH, cell density in culture, aeration rate, and inorganic carbon concentration in the medium. The effects of these interacting parameters are discussed, together with an assessment of the possible roles and significance of CO 2 -concentrating mechanisms to microalgae in marine and freshwater ecosystems.Key words: carbon acquisition, microalgae, CO 2 -concentrating mechanism, light, nutrient limitation, CO 2 supply.
Regeneration of alkaline metal amidoboranes with high purity
Publisher: Elsevier BV
Date: 2016
Enhanced hydrogen sorption properties in the LiBH4–MgH2 system catalysed by Ru nanoparticles supported on multiwalled carbon nanotubes
Publisher: Elsevier BV
Date: 04-2011
Dehydrogenation/rehydrogenation mechanism in aluminum destabilized lithium borohydride
Publisher: Springer Science and Business Media LLC
Date: 08-2009
Abstract: LiBH 4 /Al mixtures with various mol ratios were prepared by ball milling. The hydrogen storage properties of the mixtures were evaluated by differential scanning calorimetry/thermogravimetry analyses coupled with mass spectrometry measurements. The phase compositions and chemical state of elements for the LiBH 4 /Al mixtures before and after hydrogen desorption and absorption reactions were assessed via powder x-ray diffraction, infrared spectroscopy, and x-ray photoelectron spectroscopy. Dehydrogenation results revealed that LiBH 4 could react with Al to form AlB 2 and AlLi compounds with a two-step decomposition, resulting in improved dehydrogenation. The rehydrogenation experiments were investigated at 600 °C with various H 2 pressure. It was found that intermediate hydride was formed firstly at a low H 2 pressure of 30 atm, while LiBH 4 could be reformed completely after increasing the pressure to 100 atm. Absorption/desorption cycle results showed that the dehydrogenation temperature increased and the hydrogen capacity degraded with the increase of cycle numbers.
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University College London
Location: United Kingdom of Great Britain and Northern Ireland
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