ORCID Profile
0000-0002-3260-0831
Current Organisations
Helmholtz Institute Erlangen-Nürnberg
,
Rijksuniversiteit Groningen
,
Friedrich-Alexander-Universität Erlangen-Nürnberg
,
Universidad de La Sabana
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Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA07023J
Abstract: The high solubility of DPP-TT-T in 1,8-diiodooctane leads the microstructure formation towards thermodynamic equilibrium.
Publisher: Public Library of Science (PLoS)
Date: 03-05-2019
Publisher: AIP Publishing
Date: 15-10-2001
DOI: 10.1063/1.1404984
Abstract: Regioregular poly(3-(4′-(1″,4″,7″-trioxaoctyl)phenyl)thiophenes) (PEOPTs) exhibit interesting properties for the use in polymer electronics. Exposing thin films of the amorphous, disordered phase (orange phase) of the “as prepared” polymer to chloroform vapor or annealing them by heat treatment results in a redshift of the absorption maximum due to the formation of nanocrystals in an ordered phase (blue phase). As such, PEOPT thus is a very interesting conjugated polymeric material, which exhibits two different phases with well-defined order/disorder characters on one-and-the-same material. This property opens up the unique possibility to investigate the role of order/disorder on the photoexcited pattern without being obscured by the differences in chemical structure by using different materials with different crystallinity. The fact, that blue phase PEOPT exhibits absorption edges at relatively low energies around 1.8 eV, thereby demonstrating an enhanced spectral absorption range as compared to the orange phase, makes them attractive for use in photodiodes and solar cells as well. The photoinduced charge generation efficiency in both phases of PEOPT is significantly enhanced by the addition of a strong electron acceptor such as fullerene C60, as observed by quenching of the luminescence and by photoinduced absorption measurements in the infrared and uv–visible regime. The average number and the lifetime of photoinduced carriers in composites of PEOPT with a methanofullerene [6,6]-phenyl C61–butyric acid methyl ester (PCBM) are found to depend on the crystallinity of PEOPT in thin films, which gives rise to charged photoexcitations delocalized between polymer chains. Stronger bimolecular recombination in composites of the blue phase PEOPT with PCBM is observed as compared to the orange phase PEOPT/PCBM films. The origin of this enhanced recombination is found to be related to the hole mobility of the polymer.
Publisher: Wiley
Date: 09-12-2022
Abstract: Following the 2nd release of the “Emerging PV reports,” the best achievements in the performance of emerging photovoltaic devices in erse emerging photovoltaic research subjects are summarized, as reported in peer‐reviewed articles in academic journals since August 2021. Updated graphs, tables, and analyses are provided with several performance parameters, e.g., power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization efficiency, and stability test energy yield. These parameters are presented as a function of the photovoltaic bandgap energy and the average visible transmittance for each technology and application, and are put into perspective using, e.g., the detailed balance efficiency limit. The 3rd installment of the “Emerging PV reports” extends the scope toward triple junction solar cells.
Publisher: American Society for Microbiology
Date: 30-05-2019
DOI: 10.1128/MRA.00009-19
Abstract: Aeromonas hydrophila and Aeromonas dhakensis are ubiquitous in marine and aquatic environments. Both species, which cause significant skin and soft tissue infection, are often associated with water activities and floods.
Publisher: Wiley
Date: 03-2016
Publisher: Wiley
Date: 18-05-2012
Publisher: American Chemical Society (ACS)
Date: 11-12-2001
DOI: 10.1021/JP013077Y
Publisher: Public Library of Science (PLoS)
Date: 10-01-2022
DOI: 10.1371/JOURNAL.PPAT.1010166
Abstract: A hallmark of Listeria (L . ) monocytogenes pathogenesis is bacterial escape from maturing entry vacuoles, which is required for rapid bacterial replication in the host cell cytoplasm and cell-to-cell spread. The bacterial transcriptional activator PrfA controls expression of key virulence factors that enable exploitation of this intracellular niche. The transcriptional activity of PrfA within infected host cells is controlled by allosteric coactivation. Inhibitory occupation of the coactivator site has been shown to impair PrfA functions, but consequences of PrfA inhibition for L . monocytogenes infection and pathogenesis are unknown. Here we report the crystal structure of PrfA with a small molecule inhibitor occupying the coactivator site at 2.0 Å resolution. Using molecular imaging and infection studies in macrophages, we demonstrate that PrfA inhibition prevents the vacuolar escape of L . monocytogenes and enables extensive bacterial replication inside spacious vacuoles. In contrast to previously described spacious Listeria -containing vacuoles, which have been implicated in supporting chronic infection, PrfA inhibition facilitated progressive clearance of intracellular L . monocytogenes from spacious vacuoles through lysosomal degradation. Thus, inhibitory occupation of the PrfA coactivator site facilitates formation of a transient intravacuolar L . monocytogenes replication niche that licenses macrophages to effectively eliminate intracellular bacteria. Our findings encourage further exploration of PrfA as a potential target for antimicrobials and highlight that intra-vacuolar residence of L . monocytogenes in macrophages is not inevitably tied to bacterial persistence.
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/MA20026
Abstract: Probiotic products are viewed as an alternative to the use of antibiotics in freshwater fishes farming. Probiotic organisms include bacteria, yeast, and filamentous fungi offering different benefits to fish including growth promotion, inhibition of pathogen colonisation, and improvement of nutrient digestion, water quality, and stress tolerance, as well as enhancement of reproduction. For these reasons, this review aims to identify the main trends in probiotic amendment in freshwater fishes. Strategies to incorporate the probiotic strains in the fish feed or pellets to allow optimal viability of the strains as they reach the fish gastrointestinal tract (GIT) are crucial in probiotic research and commercial applications for freshwater fish.
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 22-02-2021
DOI: 10.1111/RAQ.12543
Abstract: This review aims to explore developments in the usage of multistrain probiotics in commercial freshwater‐cultured fish and to address factors that affect the efficacies of multistrain probiotics to enhance growth parameters, survival after bacterial infection and immune modulation in comparison to monostrain probiotics. From bibliographic searches in Scopus, Web of Science and PubMed, it was possible to select 81 articles that evaluated multistrain probiotics supplementation during in vivo trials in Nile tilapia ( Oreochromis niloticus ), rainbow trout ( Oncorhynchus mykiss ), common carp ( Cyprinus carpio ) and roho labeo ( Labeo rohita ). Most of the articles showed different benefits, including enhancement of fish growth performance, immune response and resistance against some pathogenic bacteria, such as Aeromonas hydrophila , Streptococcus agalactiae and Streptococcus iniae . However, only 13 journal articles included a monostrain probiotic as a control that would allow direct comparison with a probiotic bacterial mixture to determine if the mixture offered higher benefits in comparison to a monostrain probiotic and a control group without probiotic supplementation. Here we explain the main findings, including the best probiotic mixtures, and some perspectives on multistrain probiotics research and use on a commercial scale.
Publisher: Wiley
Date: 04-12-2020
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 03-2003
Publisher: Wiley
Date: 11-11-2021
Abstract: Following the 1st release of the “Emerging photovoltaic (PV) reports” , the best achievements in the performance of emerging photovoltaic devices in erse emerging photovoltaic research subjects are summarized, as reported in peer‐reviewed articles in academic journals since August 2020. Updated graphs, tables, and analyses are provided with several performance parameters, e.g., power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization efficiency, and stability test energy yield. These parameters are presented as a function of the photovoltaic bandgap energy and the average visible transmittance for each technology and application and are put into perspective using, e.g., the detailed balance efficiency limit. The 2nd instalment of the “Emerging PV reports” extends the scope toward tandem solar cells and presents the current state‐of‐the‐art in tandem solar cell performance for various material combinations.
Publisher: MDPI AG
Date: 08-07-2022
DOI: 10.3390/MICROORGANISMS10071376
Abstract: This study aims to mine a previously developed continuous-flow competitive exclusion culture (CFCEC) originating from the Tilapia gut microbiome as a rational and efficient autochthonous probiotic strain recovery source. Three isolated strains were tested on their adaptability to host gastrointestinal conditions, their antibacterial activities against aquaculture bacterial pathogens, and their antibiotic susceptibility patterns. Their genomes were fully sequenced, assembled, annotated, and relevant functions inferred, such as those related to pinpointed probiotic activities and phylogenomic comparative analyses to the closer reported strains/species relatives. The strains are possible candidates of novel genus/species taxa inside
Publisher: Elsevier BV
Date: 03-2022
DOI: 10.1016/J.JBIOSC.2021.11.004
Abstract: Tilapia is one of the most extensively farmed fish on a global scale. Lately, many studies have been carried out to select and produce probiotics for cultured fish. Bacteria from the genera Bacillus, Lactiplantibacillus (synonym: Lactobacillus), and Lactococcus are the most widely studied with respect to their probiotic potential. Among these microorganisms, Lactococcus lactis has outstanding prospects as a probiotic because it is generally recognized as safe (GRAS) and has previously been shown to exert its probiotic potential in aquaculture through different mechanisms, such as competitively excluding pathogenic bacteria, increasing food nutritional value, and enhancing the host immune response against pathogenic microorganisms. However, it is not sufficient to simply select a microorganism with significant probiotic potential for commercial probiotic development. There are additional challenges related to strategies involving the mass production of bacterial cultures, including the selection of production variables that positively influence microorganism metabolism. Over the last ten years, L. lactis production in batch and fed-batch processes has been studied to evaluate the effects of culture temperature and pH on bacterial growth. However, to gain a deeper understanding of the production processes, the effect of hydrodynamic stress on cells in bioreactor production and its influence on the probiotic potential post-manufacturing also need to be determined. This review explores the trends in tilapia culture, the probiotic mechanisms employed by L. lactis in aquaculture, and the essential parameters for the optimal scale-up of this probiotic.
No related grants have been discovered for Javier Fernando Melo Bolivar.