ORCID Profile
0000-0002-3059-1572
Current Organisation
University of South Australia
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Publisher: Informa UK Limited
Date: 31-07-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B604856K
Abstract: The scattering spectra of single gold nanorods with aspect ratios between 2 and 4 have been examined by dark field microscopy. The results show that the longitudinal plasmon resonance (electron oscillation along the long axis of the rod) broadens as the width of the rods decreases from 14 to 8 nm. This is attributed to electron surface scattering. Analysis of the data using gamma = gamma(bulk) + Anu(F)/L(eff), where L(eff) is the effective path length of the electrons and nu(F) is the Fermi velocity, allows us to determine a value for the surface scattering parameter of A = 0.3. Larger rods with widths of 19 and 30 nm were also examined. These s les also show spectral broadening, which is attributed to radiation d ing. The relative strengths of the surface scattering and radiation d ing effects are in excellent agreement with recent work on spherical gold nanoparticles by Sönnichsen et al., Phys. Rev. Lett., 2002, 88, 077402 and by Berciaud et al., Nano Lett., 2005, 5, 515.
Publisher: Cambridge University Press (CUP)
Date: 02-12-2021
DOI: 10.1017/S0016756820001259
Abstract: Studies that reveal detailed information about trilobite growth, particularly early developmental stages, are crucial for improving our understanding of the phylogenetic relationships within this iconic group of fossil arthropods. Here we document an essentially complete ontogeny of the trilobite Redlichia cf. versabunda from the Cambrian Series 2 (late Stage 4) Ramsay Limestone of Yorke Peninsula in South Australia, including some of the best-preserved protaspides (the earliest biomineralized trilobite larval stage) known for any Cambrian trilobite. These protaspid stages exhibit similar morphological characteristics to many other taxa within the Suborder Redlichiina, especially to closely related species such as Metaredlichia cylindrica from the early Cambrian period of China. Morphological patterns observed across early developmental stages of different groups within the Order Redlichiida are discussed. Although redlichiine protaspides exhibit similar overall morphologies, certain ontogenetic characters within this suborder have potential phylogenetic signal, with different superfamilies characterized by unique trait combinations in these early growth stages.
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 06-2015
Publisher: Informa UK Limited
Date: 17-01-2018
Publisher: Elsevier BV
Date: 09-2005
Publisher: Informa UK Limited
Date: 02-01-2016
Publisher: Informa UK Limited
Date: 28-03-2021
Publisher: Elsevier BV
Date: 04-2017
Publisher: Informa UK Limited
Date: 03-07-2021
Publisher: Informa UK Limited
Date: 17-05-2017
Publisher: Informa UK Limited
Date: 23-04-2020
Publisher: Informa UK Limited
Date: 26-09-2014
Publisher: Informa UK Limited
Date: 09-02-2023
Publisher: Wiley
Date: 04-03-2013
DOI: 10.1111/PALA.12029
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 12-2011
Publisher: Informa UK Limited
Date: 04-2011
Publisher: Springer Science and Business Media LLC
Date: 21-10-2014
Publisher: Informa UK Limited
Date: 02-04-2023
Publisher: Springer Science and Business Media LLC
Date: 12-2011
DOI: 10.1038/NATURE10689
Abstract: Until recently, intricate details of the optical design of non-biomineralized arthropod eyes remained elusive in Cambrian Burgess-Shale-type deposits, despite exceptional preservation of soft-part anatomy in such Konservat-Lagerstätten. The structure and development of ommatidia in arthropod compound eyes support a single origin some time before the latest common ancestor of crown-group arthropods, but the appearance of compound eyes in the arthropod stem group has been poorly constrained in the absence of adequate fossils. Here we report 2-3-cm paired eyes from the early Cambrian (approximately 515 million years old) Emu Bay Shale of South Australia, assigned to the Cambrian apex predator Anomalocaris. Their preserved visual surfaces are composed of at least 16,000 hexagonally packed ommatidial lenses (in a single eye), rivalling the most acute compound eyes in modern arthropods. The specimens show two distinct taphonomic modes, preserved as iron oxide (after pyrite) and calcium phosphate, demonstrating that disparate styles of early diagenetic mineralization can replicate the same type of extracellular tissue (that is, cuticle) within a single Burgess-Shale-type deposit. These fossils also provide compelling evidence for the arthropod affinities of anomalocaridids, push the origin of compound eyes deeper down the arthropod stem lineage, and indicate that the compound eye evolved before such features as a hardened exoskeleton. The inferred acuity of the anomalocaridid eye is consistent with other evidence that these animals were highly mobile visual predators in the water column. The existence of large, macrophagous nektonic predators possessing sharp vision--such as Anomalocaris--within the early Cambrian ecosystem probably helped to accelerate the escalatory 'arms race' that began over half a billion years ago.
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B405157B
Publisher: Informa UK Limited
Date: 11-12-2018
Publisher: History of the Earth Sciences Society
Date: 2018
DOI: 10.17704/1944-6178-37.2.416
Abstract: Robert Bedford (1874–1951), based in the isolated community of Kyancutta in South Australia, was a unique contributor to world geology, specifically in the field of meteorites and fossil archaeocyatha. Born Robert Arthur Buddicom in Shropshire, UK, he was an Oxford graduate who worked as a scientist in Freiberg, Naples, Birmingham and Shrewsbury as well as with the Natural History Museum, Kensington and the Plymouth Museum in the United Kingdom. He was a Fellow of the Geological Society of London, 1899–1910. In 1915, Buddicom changed his surname to Bedford and relocated to South Australia. During the 1920s, Bedford expanded his geological interests with the establishment of a public museum in Kyancutta in 1929. This included material previously collected and stored in the United Kingdom before being sent to Australia. Bedford was very successful in collecting material from the distant Henbury meteorite craters in Australia's Northern Territory, during three separate trips in 1931–1933. He became an authority on meteorites with much Henbury material being sent to the British Museum in London. However, Bedford's work on, and collecting of, meteorites resulted in a serious rift with the South Australian scientific establishment. Bedford is best known amongst geologists for his five taxonomic papers on the superbly preserved lower Cambrian archaeocyath fossils from the Ajax Mine near Beltana in South Australia's Flinders Ranges with field work commencing in about 1932 and extending until World War II. This research, describing thirty new genera and ninety-nine new species, was published in the Memoirs of the Kyancutta Museum, a journal that Bedford personally established and financed in 1934. These papers are regularly referenced today in international research dealing with archaeocyaths.
Publisher: Informa UK Limited
Date: 04-2011
Publisher: Wiley
Date: 07-2012
Publisher: Elsevier BV
Date: 04-2020
Publisher: Wiley
Date: 16-09-2010
Publisher: Informa UK Limited
Date: 06-2013
Publisher: Elsevier BV
Date: 08-2016
Publisher: Informa UK Limited
Date: 12-08-2020
Publisher: Wiley
Date: 09-01-2006
Publisher: Informa UK Limited
Date: 10-02-2020
Publisher: Informa UK Limited
Date: 02-01-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B607661K
Publisher: Geological Society of London
Date: 2013
DOI: 10.1144/M38.19
Publisher: Informa UK Limited
Date: 04-2011
Publisher: Polska Akademia Nauk Instytut Paleobiologii (Institute of Paleobiology, Polish Academy of Sciences)
Date: 2019
Publisher: Wiley
Date: 13-05-2016
DOI: 10.1111/PALA.12243
Publisher: Informa UK Limited
Date: 03-2013
Publisher: Geological Society of London
Date: 10-11-2016
DOI: 10.1144/JGS2015-083
Publisher: Cambridge University Press (CUP)
Date: 21-10-2016
DOI: 10.1017/S0016756816000704
Abstract: Correlation of lower Cambrian strata is often confounded by provincialism of key fauna. The widespread occurrence of the micromollusc Watsonella crosbyi Grabau, 1900 is therefore an important biostratigraphic signpost with potential for international correlation of lower Cambrian successions. Previous correlations of W. crosbyi from Australia (Normanville Group) suggested an Atdabanian- to Botoman-equivalent age. However, in the upper part of the Mount Terrible Formation, stratigraphic ranges of W. crosbyi and Aldanella sp. cf. golubevi overlap prior to the incoming of vertically burrowed ‘piperock’, which is indicative of an age no earlier than Cambrian Stage 2. The stratigraphic range of W. crosbyi in the Normanville Group, South Australia correlates with the ranges of the taxon in China, France, Mongolia and Siberia (though not Newfoundland). The new Australian data add further support for considering the first occurrence of W. crosbyi a good potential candidate for defining the base of Cambrian Stage 2. The stratigraphic range of W. crosbyi through the lower Cambrian Normanville Group has been determined based on collections from measured sections. Although rare, W. crosbyi is part of an assemblage of micromolluscs including Bemella sp., Parailsanella sp. cf. murenica and a sinistral form of Aldanella ( A. sp. cf. A. golubevi ). Other fauna present include Australohalkieria sp., Eremactis mawsoni , chancelloriids and Cupitheca sp.
Publisher: AIP Publishing
Date: 10-04-2006
DOI: 10.1063/1.2193967
Abstract: We have explored the influence of different matrices on the emission line shape of in idual homogeneously coated CdSe∕CdS∕ZnS nanocrystals. The results obtained corroborate previous observations of a correlation between blinking events and spectral diffusion, but in addition we have found that the extent of spectral diffusion is almost independent of the dielectric environment of the nanocrystal (NC). Additionally, we report the observation of a correlation between the linewidth and emission energy which is not expected to occur in the spherical-symmetric NCs employed in this work. The implications of these results are discussed.
Publisher: Informa UK Limited
Date: 23-04-2020
Publisher: Informa UK Limited
Date: 05-08-2014
Publisher: Informa UK Limited
Date: 25-09-2020
Publisher: Springer Science and Business Media LLC
Date: 06-2011
DOI: 10.1038/NATURE10097
Abstract: Despite the status of the eye as an "organ of extreme perfection", theory suggests that complex eyes can evolve very rapidly. The fossil record has, until now, been inadequate in providing insight into the early evolution of eyes during the initial radiation of many animal groups known as the Cambrian explosion. This is surprising because Cambrian Burgess-Shale-type deposits are replete with exquisitely preserved animals, especially arthropods, that possess eyes. However, with the exception of biomineralized trilobite eyes, virtually nothing is known about the details of their optical design. Here we report exceptionally preserved fossil eyes from the Early Cambrian (∼ 515 million years ago) Emu Bay Shale of South Australia, revealing that some of the earliest arthropods possessed highly advanced compound eyes, each with over 3,000 large ommatidial lenses and a specialized 'bright zone'. These are the oldest non-biomineralized eyes known in such detail, with preservation quality exceeding that found in the Burgess Shale and Chengjiang deposits. Non-biomineralized eyes of similar complexity are otherwise unknown until about 85 million years later. The arrangement and size of the lenses indicate that these eyes belonged to an active predator that was capable of seeing in low light. The eyes are more complex than those known from contemporaneous trilobites and are as advanced as those of many living forms. They provide further evidence that the Cambrian explosion involved rapid innovation in fine-scale anatomy as well as gross morphology, and are consistent with the concept that the development of advanced vision helped to drive this great evolutionary event.
Publisher: Elsevier BV
Date: 09-2019
No related grants have been discovered for James Jago.