ORCID Profile
0000-0002-6355-7944
Current Organisation
ANSTO - Australian Synchrotron
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Publisher: International Union of Crystallography (IUCr)
Date: 26-06-2001
DOI: 10.1107/S2056989020008099
Abstract: Exceptionally large crystals of posnjakite, Cu 4 SO 4 (OH) 6 (H 2 O), formed during corrosion of a Swagelock(tm) Snubber copper gasket within the MX1 beamline at the ANSTO-Melbourne, Australian Synchrotron. The crystal structure was solved using synchrotron radiation to R 1 = 0.029 and revealed a structure based upon [Cu 4 (OH) 6 (H 2 O)O] sheets, which contain Jahn–Teller-distorted Cu octahedra. The sulfate tetrahedra are bonded to one side of the sheet via corner sharing and linked to successive sheets via extensive hydrogen bonds. The sulfate tetrahedra are split and rotated, which enables additional hydrogen bonds.
Publisher: American Chemical Society (ACS)
Date: 02-01-2015
DOI: 10.1021/CM503439R
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B303362G
Publisher: International Union of Crystallography (IUCr)
Date: 2015
DOI: 10.1107/S1600577514021717
Abstract: MX1 is a bending-magnet crystallography beamline at the 3 GeV Australian Synchrotron. The beamline delivers hard X-rays in the energy range from 8 to 18 keV to a focal spot at the s le position of 120 µm FWHM. The beamline endstation and ancillary equipment facilitate local and remote access for both chemical and biological macromolecular crystallography. Here, the design of the beamline and endstation are discussed. The beamline has enjoyed a full user program for the last seven years and scientific highlights from the user program are also presented.
Publisher: International Union of Crystallography (IUCr)
Date: 15-06-2023
DOI: 10.1107/S160057752300406X
Abstract: A new high-pressure single-crystal diffraction setup has been designed and implemented at the Australian Synchrotron for collecting molecular and protein crystal structures. The setup incorporates a modified micro-Merrill–Bassett cell and holder designed specifically to fit onto the horizontal air-bearing goniometer, allowing high-pressure diffraction measurements to be collected with little to no modification of the beamline setup compared with ambient data collections. Compression data for the amino acid, L-threonine, and the protein, hen egg-white lysozyme, were collected, showcasing the capabilities of the setup.
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B808374F
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TC31030B
Publisher: Springer Science and Business Media LLC
Date: 14-01-2015
DOI: 10.1038/NCOMMS7013
Abstract: Solution-processed organic photovoltaic cells (OPVs) hold great promise to enable roll-to-roll printing of environmentally friendly, mechanically flexible and cost-effective photovoltaic devices. Nevertheless, many high-performing systems show best power conversion efficiencies (PCEs) with a thin active layer (thickness is ~100 nm) that is difficult to translate to roll-to-roll processing with high reproducibility. Here we report a new molecular donor, benzodithiophene terthiophene rhodanine (BTR), which exhibits good processability, nematic liquid crystalline behaviour and excellent optoelectronic properties. A maximum PCE of 9.3% is achieved under AM 1.5G solar irradiation, with fill factor reaching 77%, rarely achieved in solution-processed OPVs. Particularly promising is the fact that BTR-based devices with active layer thicknesses up to 400 nm can still afford high fill factor of ~70% and high PCE of ~8%. Together, the results suggest, with better device architectures for longer device lifetime, BTR is an ideal candidate for mass production of OPVs.
Publisher: CSIRO Publishing
Date: 2007
DOI: 10.1071/CH07160
Publisher: American Chemical Society (ACS)
Date: 13-10-2006
DOI: 10.1021/JA064408T
Publisher: International Union of Crystallography (IUCr)
Date: 03-04-2018
DOI: 10.1107/S1600577518003120
Abstract: MX2 is an in-vacuum undulator-based crystallography beamline at the 3 GeV Australian Synchrotron. The beamline delivers hard X-rays in the energy range 4.8–21 keV to a focal spot of 22 × 12 µm FWHM (H × V). At 13 keV the flux at the s le is 3.4 × 10 12 photons s −1 . The beamline endstation allows robotic handling of cryogenic s les via an updated SSRL SAM robot. This beamline is ideal for weakly diffracting hard-to-crystallize proteins, virus particles, protein assemblies and nucleic acids as well as smaller molecules such as inorganic catalysts and organic drug molecules. The beamline is now mature and has enjoyed a full user program for the last nine years. This paper describes the beamline status, plans for its future and some recent scientific highlights.
Publisher: Cold Spring Harbor Laboratory
Date: 13-01-2022
DOI: 10.1101/2022.01.12.473243
Abstract: The mutated residues in the Omicron spike protein have led to its rapid classification as a new SARS-CoV-2 variant of concern. As a result, Omicron may escape from the immune system, decreasing the protection provided by COVID-19 vaccines. Preliminary data shows a weaker neutralizing antibody response to Omicron compared to the ancestral SARS-CoV-2 virus, which can be increased after a booster vaccine. Here, we report that CD8 + T cells can recognize Omicron variant epitopes presented by HLA-A*02:01 in both COVID-19 recovered and vaccinated in iduals, even 6 months after infection or vaccination. Additionally, the T cell response was stronger for Omicron variant epitopes after the vaccine booster. Altogether, T cells can recognize Omicron variants, especially in vaccinated in iduals after the vaccine booster. CD8 + T cells response against Omicron variant epitopes is stronger after the vaccine booster.
Publisher: Elsevier BV
Date: 05-2005
Publisher: Wiley
Date: 08-03-2010
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B501446H
Abstract: Reactions between conjugated dienols and maleic anhydride provide either cis-fused or trans-fused bicyclic products as major products, depending upon how the reaction is carried out. Simply mixing the two reactants together generally leads to cis-fused lactone acids in thermal reactions which proceed viaintermolecular Diels-Alder reaction followed by intramolecular esterification. Pre-forming the maleate half ester derivative followed by heating affords predominantly trans-fused lactone acids in good yields by way of an intramolecular Diels-Alder (IMDA) reaction. Sorbyl citraconate half esters undergo a rapid thermolytic fragmentation in refluxing toluene to form the dienol and citraconic anhydride. The resulting diene-dienophile pair undergo an intermolecular cycloaddition followed by a rapid intramolecular esterification to give cis-fused bicyclic lactone acids as major products. The IMDA reaction of citraconic half esters is sufficiently rapid in DMSO to dominate over fragmentation: the exo-cycloadduct is formed almost exclusively. Nine literature reports of endo-selective IMDA reactions of triene acids are erroneous the cycloadditions proceed in an intermolecular manner.
Publisher: Springer Science and Business Media LLC
Date: 03-08-2007
Publisher: American Chemical Society (ACS)
Date: 10-05-2001
DOI: 10.1021/JO015516V
Abstract: An investigation into the endo/exo selectivity and pi-diastereofacial selectivity of ester-tethered intramolecular Diels-Alder reactions is reported. High levels of exo selectivity are realized with terminally substituted dienophiles, and high lk pi-diastereofacial selectivities are induced by the presence of a bulky dioxolanyl substituent at the allylic position of the tether. Precursors 19S, 20S, and 21S, readily prepared from glucose, provide densely functionalized bicyclic lactones of predictable stereochemistry in high yields in enantiomerically pure form upon thermolysis at 110 degrees C. B3LYP/6-31G(d) theory provides good descriptions of transition structures for these reactions and allows an understanding of the formation of the major cycloadducts.
Publisher: American Chemical Society (ACS)
Date: 04-01-2012
DOI: 10.1021/CG201020W
No related grants have been discovered for Rachel Williamson.