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Articles 1 - 30 of 122
Full-Text Articles in Physical Sciences and Mathematics
Automatic Reaction To A Chemical Event Detected By A Low-Cost Wireless Chemical Sensing Network, Stephen Beirne, King Tong Lau, Brian Corcoran, Dermot Diamond
Automatic Reaction To A Chemical Event Detected By A Low-Cost Wireless Chemical Sensing Network, Stephen Beirne, King Tong Lau, Brian Corcoran, Dermot Diamond
Faculty of Science - Papers (Archive)
A test-scale wireless chemical sensor network (WCSN) has been deployed within a controlled Environmental Chamber (EC). The combined signals from the WCSN were used to initiate a controllable response to the detected chemical event. When a particular sensor response pattern was obtained, a purging cycle was initiated. Sensor data were continuously checked against user-defined action limits, to determine if a chemical event had occurred. An acidic contaminant was used to demonstrate the response of the sensor network. Once the acid plume was simultaneously detected by a number of wireless chemical sensor nodes, an automatic response action, which was the purging …
Dynamics Of Apomyoglobin In The Α-To-Β Transition And Of Partially Unfolded Aggregated Protein, E. Fabiani, A. M. Stadler, D. Madern, M. M. Koza, M. Tehei, M. Hirai, G. Zaccai
Dynamics Of Apomyoglobin In The Α-To-Β Transition And Of Partially Unfolded Aggregated Protein, E. Fabiani, A. M. Stadler, D. Madern, M. M. Koza, M. Tehei, M. Hirai, G. Zaccai
Faculty of Science - Papers (Archive)
Changes of molecular dynamics in the α-to-β transition associated with amyloid fibril formation were explored on apo-myoglobin (ApoMb) as a model system. Circular dichroism, neutron and X-ray scattering experiments were performed as a function of temperature on the protein, at different solvent conditions. A significant change in molecular dynamics was observed at the α-to-β transition at about 55 ˚C, indicating a more resilient high temperature β structure phase. A similar effect at approximately the same temperature was observed in holo-myoglobin, associated with partial unfolding and protein aggregation. A study in a wide temperature range between 20 K and 360 K …
M Protein Mediated Plasminogen Binding Is Essential For The Virulence Of An Invasive Streptococcus Pyogenes Isolate, Martina L. Sanderson-Smith, K. Dinkla, J. N. Cole, Amanda J. Cork, P. G. Maamary, Jason D. Mcarthur, G. S. Chhatwal, Mark J. Walker
M Protein Mediated Plasminogen Binding Is Essential For The Virulence Of An Invasive Streptococcus Pyogenes Isolate, Martina L. Sanderson-Smith, K. Dinkla, J. N. Cole, Amanda J. Cork, P. G. Maamary, Jason D. Mcarthur, G. S. Chhatwal, Mark J. Walker
Faculty of Science - Papers (Archive)
The human protease plasmin plays a crucial role in the capacity of the group A streptococcus (Streptococus pyogenes; GAS) to initiate invasive disease. The GAS strain NS88.2 was isolated from a case of bacteremia from the Northern Territory of Australia, a region with high rates of GAS invasive disease. Mutagenesis of the NS88.2 plasminogen binding M protein Prp was undertaken to examine the contribution of plasminogen binding and cell surface plasmin acquisition to virulence. The isogenic mutant NS88.2prp was engineered whereby four amino acid residues critical for plasminogen binding were converted to alanine codons in the GAS genome sequence. The …
Small Heat Shock Protein Activity Is Regulated By Variable Oligomeric Substructure, J. L. Benesch, M. Ayoub, C. V. Robinson, J. A. Aquilina
Small Heat Shock Protein Activity Is Regulated By Variable Oligomeric Substructure, J. L. Benesch, M. Ayoub, C. V. Robinson, J. A. Aquilina
Faculty of Science - Papers (Archive)
The alpha-crystallins are members of the small heat shock protein (sHSP) family of molecular chaperones which have evolved to minimize intracellular protein aggregation, however they are also implicated in a number of protein deposition diseases. In this study we have employed novel mass spectrometry techniques to investigate the changes in quaternary structure associated with this switch from chaperone to adjuvant of aggregation. We have replicated the oligomeric rearrangements observed for in vivo disease-related modifications, without altering the protein sequence, by refolding the alpha-crystallins in vitro. This refolding results in a loss of dimeric substructure concomitant with an augmentation of substrate …
Cell Wall-Bound Ultraviolet-Screening Compounds Explain The High Ultraviolet Tolerance Of The Antarctic Moss, Ceratodon Purpureus, L. J. Clarke, Sharon A. Robinson
Cell Wall-Bound Ultraviolet-Screening Compounds Explain The High Ultraviolet Tolerance Of The Antarctic Moss, Ceratodon Purpureus, L. J. Clarke, Sharon A. Robinson
Faculty of Science - Papers (Archive)
Studies of ultraviolet (UV) light-induced DNA damage in three Antarctic moss species have shown Ceratodon purpureus to be the most UV tolerant, despite containing lower concentrations of methanol-soluble UV-screening compounds than the co-occurring Bryum pseudotriquetrum. In this study, alkali extraction of cell wall-bound phenolics, combined with methanol extraction of soluble phenolics, was used to determine whether cell wall-bound UV screens explain the greater UV tolerance of C. purpureus. The combined pool of UV screens was similar in B. pseudotriquetrum and C. purpureus, but whilst B. pseudotriquetrum had almost equal concentrations of MeOH-soluble and alkali-extractable cell wall-bound UV-screening compounds, in C. …
Mid-Holocene Enso: Issues In Quantitative Model-Proxy Data Comparisons, J Brown, A W. Tudhope, M Collins, H V. Mcgregor
Mid-Holocene Enso: Issues In Quantitative Model-Proxy Data Comparisons, J Brown, A W. Tudhope, M Collins, H V. Mcgregor
Faculty of Science - Papers (Archive)
Evaluation of climate model simulations using observed data contributes to the assessment of confidence in model predictions of future climate change. The mid-Holocene represents an opportunity to evaluate model simulations of El Niño–Southern Oscillation (ENSO) in comparison with coral proxy evidence of reduced ENSO amplitude. Quantitative comparisons between coral records and model output have been limited by (1) the use of different measures of ENSO amplitude, (2) possible sampling of natural variability in short records, and (3) uncertainty about the stationarity of the relationship between central Pacific sea surface temperature (SST) variability and ENSO signals at the coral site. We …
Allelic Variants Of Streptokinase From Streptococcus Pyogenes Display Functional Differences In Plasminogen Activation., Jason D. Mcarthur, F. C. Mckay, V. Ramachandran, P. Shyam, Amanda J. Cork, Martina L. Sanderson-Smith, J. N. Cole, U. Ringdahl, U. Sjobring, M. Ranson, Mark J. Walker
Allelic Variants Of Streptokinase From Streptococcus Pyogenes Display Functional Differences In Plasminogen Activation., Jason D. Mcarthur, F. C. Mckay, V. Ramachandran, P. Shyam, Amanda J. Cork, Martina L. Sanderson-Smith, J. N. Cole, U. Ringdahl, U. Sjobring, M. Ranson, Mark J. Walker
Faculty of Science - Papers (Archive)
A common mammalian defence mechanism employed to prevent systemic dissemination of invasive bacteria involves occlusion of local microvasculature and encapsulation of bacteria within fibrin networks. Acquisition of plasmin activity at the bacterial cell surface circumvents this defence mechanism allowing invasive disease initiation. To facilitate this process, S. pyogenes secrete streptokinase, a plasminogen activating protein. Streptokinase polymorphism exhibited by S. pyogenes isolates is well characterised. However, the functional differences displayed by these variants and the biological significance of this variation has not been elucidated. Phylogenetic analysis of ska sequences from 28 S. pyogenes isolates revealed two main sequence clusters (clusters 1 …
Down To Atomic-Scale Intracellular Water Dynamics, M. Jasnin, M. Moulin, M. Haertlein, G. Zaccai, M. Tehei
Down To Atomic-Scale Intracellular Water Dynamics, M. Jasnin, M. Moulin, M. Haertlein, G. Zaccai, M. Tehei
Faculty of Science - Papers (Archive)
Water constitutes the intracellular matrix in which biological molecules interact. Understanding its dynamic state is a main scientific challenge, which continues to provoke controversy after more than 50 years of study. We measured water dynamics in vivo in the cytoplasm of Escherichia coli by using neutron scattering and isotope labelling. Experimental timescales covered motions from pure water to interfacial water, on an atomic length scale. In contrast to the widespread opinion that water is ‘tamed’ by macromolecular confinement, the measurements established that water diffusion within the bacteria is similar to that of pure water at physiological temperature.
In Vivo Measurement Of Internal And Global Macromolecular Motions In E. Coli, M. Jasnin, M. Moulin, M. Haertlein, G. Zaccai, M. Tehei
In Vivo Measurement Of Internal And Global Macromolecular Motions In E. Coli, M. Jasnin, M. Moulin, M. Haertlein, G. Zaccai, M. Tehei
Faculty of Science - Papers (Archive)
We present direct quasielastic neutron scattering measurements, in vivo, of macromolecular dynamics in E. coli. The experiments were performed on a wide range of time-scales, to cover the large panel of internal and self-diffusion motions. Three major internal processes were extracted at physiological temperature: a fast picosecond (ps) process that corresponded to restricted jump diffusion motions, and two slower processes that resulted from reorientational motions occurring in about 40 ps and 90 ps, respectively. The analysis of the fast process revealed that the cellular environment leads to an appreciable increase in internal molecular flexibility and diffusive motion rates compared to …
Opacity Factor Activity And Epithelial Cell Binding By The Serum Opacity Factor Protein Of Streptococcus Pyogenes Are Functionally Discrete, C. M. Gillen, H. S. Courtney, K. Schulze, M. Rohde, Mark R. Wilson, A. M. Timmer, C. A. Guzman, V. Nizet, G. S. Chhatwal, Mark J. Walker
Opacity Factor Activity And Epithelial Cell Binding By The Serum Opacity Factor Protein Of Streptococcus Pyogenes Are Functionally Discrete, C. M. Gillen, H. S. Courtney, K. Schulze, M. Rohde, Mark R. Wilson, A. M. Timmer, C. A. Guzman, V. Nizet, G. S. Chhatwal, Mark J. Walker
Faculty of Science - Papers (Archive)
Serum opacity factor (SOF) is a unique multifunctional virulence determinant expressed at the surface of Streptococcus pyogenes and has been shown to elicit protective immunity against GAS infection in a murine challenge model. SOF consists of two distinct domains with different binding capacities: an N-terminal domain that binds apolipoprotein AI and a C-terminal repeat domain that binds fibronectin and fibrinogen. The capacity of SOF to opacify serum by disrupting the structure of high density lipoproteins may preclude its use as a vaccine antigen in humans. This study generated mutant forms of recombinant SOF with reduced (100-fold) or abrogated opacity factor …
Somatic Mutation And The Antarctic Ozone Hole, L. J. Clarke, Sharon A. Robinson, D. J. Ayre
Somatic Mutation And The Antarctic Ozone Hole, L. J. Clarke, Sharon A. Robinson, D. J. Ayre
Faculty of Science - Papers (Archive)
1 Previous studies of Antarctic clonal moss populations using RAPD markers have reported extraordinarily high levels of genetic variation. This has been claimed to reflect somatic mutation, possibly resulting from elevated UV-B radiation. 2 Our study used microsatellite markers to compare the genetic variation present within continental Antarctic, sub-Antarctic and temperate populations of the moss Ceratodon purpureus. 3 In contrast to the RAPD studies, microsatellite data revealed that C. purpureus populations from continental Antarctica display less intra-population genetic diversity than populations from a range of temperate and sub-Antarctic sites. 4 Analysis of Molecular Variation (AMOVA) revealed that populations within the …
Solvent Isotope Effect On Macromolecular Dynamics In E. Coli, M. Jasnin, M. Tehei, M. Moulin, M. Haertlein, G. Zaccai
Solvent Isotope Effect On Macromolecular Dynamics In E. Coli, M. Jasnin, M. Tehei, M. Moulin, M. Haertlein, G. Zaccai
Faculty of Science - Papers (Archive)
Elastic incoherent neutron scattering was used to explore solvent isotope effects on average macromolecular dynamics in vivo. Measurements were performed on living E. coli bacteria containing H2O and D2O, respectively, close to physiological conditions of temperature. Global macromolecular flexibility, expressed as mean square fluctuation (MSF) values, and structural resilience in a free energy potential, expressed as a mean effective force constant, hk0i, were extracted in the two solvent conditions. They referred to the average contribution of all macromolecules inside the cell, mostly dominated by the internal motions of the protein fraction. Flexibility and resilience were both found to be smaller …
Synchronicity Of Thermogenic Activity, Alternative Pathway Respiratory Flux, Aox Protein Content, And Carbohydrates In Receptacle Tissues Of Sacred Lotus During Floral Development, Nicole M. Grant, Rebecca E. Miller, Jennifer R. Watling, Sharon A. Robinson
Synchronicity Of Thermogenic Activity, Alternative Pathway Respiratory Flux, Aox Protein Content, And Carbohydrates In Receptacle Tissues Of Sacred Lotus During Floral Development, Nicole M. Grant, Rebecca E. Miller, Jennifer R. Watling, Sharon A. Robinson
Faculty of Science - Papers (Archive)
The relationships between heat production, alternative oxidase (AOX) pathway flux, AOX protein, and carbohydrates during floral development in Nelumbo nucifera (Gaertn.) were investigated. Three distinct physiological phases were identified: pre-thermogenic, thermogenic, and post-thermogenic. The shift to thermogenic activity was associated with a rapid, 10-fold increase in AOX protein. Similarly, a rapid decrease in AOX protein occurred post-thermogenesis. This synchronicity between AOX protein and thermogenic activity contrasts with other thermogenic plants where AOX protein increases some days prior to heating. AOX protein in thermogenic receptacles was significantly higher than in post-thermogenic and leaf tissues. Stable oxygen isotope measurements confirmed that the …
Uptake And Internalisation Of Copper By Three Marine Microalgae: Comparison Of Copper-Sensitive And Copper-Tolerant Species, Jacqueline L. Levy, Brad M. Angel, Jennifer L. Stauber, Wing L. Poon, Stuart L. Simpson, Shuk Han Cheng, Dianne F. Jolley
Uptake And Internalisation Of Copper By Three Marine Microalgae: Comparison Of Copper-Sensitive And Copper-Tolerant Species, Jacqueline L. Levy, Brad M. Angel, Jennifer L. Stauber, Wing L. Poon, Stuart L. Simpson, Shuk Han Cheng, Dianne F. Jolley
Faculty of Science - Papers (Archive)
Although it has been well established that different species of marine algae have different sensitivities to metals, our understanding of the physiological and biochemical basis for these differences is limited. This study investigated copper adsorption and internalisation in three algal species with differing sensitivities to copper. The diatom Phaeodactylum tricornutum was particularly sensitive to copper, with a 72-h IC50 (concentration of copper to inhibit growth rate by 50%) of 8.0 μg Cu L-1, compared to the green algae Tetraselmis sp. (72-h IC50 47 μg Cu L-1) and Dunaliella tertiolecta (72-h IC50 530 μg Cu L-1 …
Direct Ascorbic Acid Detection With Ferritin Immobilized On Single-Walled Carbon Nanotubes, Chonlada Dechakiatkrai, Jun Chen, Carol M. Lynam, Kwang Min Shin, Seon Jeong Kim, Sukon Phanichphant, Gordon G. Wallace
Direct Ascorbic Acid Detection With Ferritin Immobilized On Single-Walled Carbon Nanotubes, Chonlada Dechakiatkrai, Jun Chen, Carol M. Lynam, Kwang Min Shin, Seon Jeong Kim, Sukon Phanichphant, Gordon G. Wallace
Faculty of Science - Papers (Archive)
Ferritin protein was noncovalently immobilized onto single-walled carbon nanotubes (SWNTs). This SWNT/ferritin composite was characterized using cyclic voltammetry, UV-visible spectroscopy, Raman spectroscopy, and high-resolution transmission electron microscopy. The use of the SWNT/ferritin film as an amperometric biosensor was demonstrated by sensing ascorbic acid in phosphate-buffered saline solution with a sensitivity of 767 uAmg. It demonstrated that ferritin protein bound to SWNTs enhances the oxidation reaction of ascorbic acid over 11-fold.
Validation Of Hno3, C1ono2, And N2o5 From The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (Ace-Fts), M A. Wolff, T Kerzenmacher, K Strong, K A. Walker, M Toohey, E Dupuy, P F. Bernath, C Boone, S Brohede, V Catoire, T Von Clarmann, M Coffey, W Daffer, M De Maziere, P Duchatelet, N Glatthor, David W. Griffith, J Hannigan, F Hase, M Hopfner, N Huret, Nicholas B. Jones, K W. Jucks, A. Kagawa, Y Kasai, I Kramer, H Kullmann, J Kuttippurath, E Mahieu, G L. Manney, Christopher Mcelroy, C Mclinden, Y Mebarki, S Mikuteit, D Murtagh, C Piccolo, P Raspollini, M Ridolfi, R Ruhnke, M Santee, C Senten, D Smale, C Tetard, J Urban, S Wood
Validation Of Hno3, C1ono2, And N2o5 From The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (Ace-Fts), M A. Wolff, T Kerzenmacher, K Strong, K A. Walker, M Toohey, E Dupuy, P F. Bernath, C Boone, S Brohede, V Catoire, T Von Clarmann, M Coffey, W Daffer, M De Maziere, P Duchatelet, N Glatthor, David W. Griffith, J Hannigan, F Hase, M Hopfner, N Huret, Nicholas B. Jones, K W. Jucks, A. Kagawa, Y Kasai, I Kramer, H Kullmann, J Kuttippurath, E Mahieu, G L. Manney, Christopher Mcelroy, C Mclinden, Y Mebarki, S Mikuteit, D Murtagh, C Piccolo, P Raspollini, M Ridolfi, R Ruhnke, M Santee, C Senten, D Smale, C Tetard, J Urban, S Wood
Faculty of Science - Papers (Archive)
The Atmospheric Chemistry Experiment (ACE) satellite was launched on 12 August 2003. Its two instruments measure vertical profiles of over 30 atmospheric trace gases by analyzing solar occultation spectra in the ultraviolet/visible and infrared wavelength regions. The reservoir gases HNO3, ClONO2, and N2O5 are three of the key species provided by the primary instrument, the ACE Fourier Transform Spectrometer (ACE-FTS). This paper describes the ACE-FTS version 2.2 data products, including the N2O5 update, for the three species and presents validation comparisons with available observations. We have compared volume mixing ratio …
Emsian (Early Devonian) Tetracorals (Cnidaria) From Grattai Creek, New South Wales, Anthony J. Wright
Emsian (Early Devonian) Tetracorals (Cnidaria) From Grattai Creek, New South Wales, Anthony J. Wright
Faculty of Science - Papers (Archive)
The tetracoral species Phillipsastrea scotti sp. nov. and Trapezophyllum grattaiensis sp. nov. are described from strata assigned to the middle Emsian (nothoperbonus to inversus conodont zones: Early Devonian) part of the Cunningham Formation at Grattai Creek, west of Mudgee, N.S.W. For comparison with the former, Phillipsastrea oculoides, from the Early Devonian (late Pragian or early Emsian) Garra Formation in the Wellington area of N.S.W., is revised on the basis of the type material; new longitudinal thin sections show indisputable horseshoe dissepiments and trabecular fans in this species.
Do Green And Golden Bell Frogs Litoria Aurea Occupy Habitats With Fungicidal Properties?, C G. Threlfall, Dianne F. Jolley, N Evershed, R L. Goldingay, W A. Buttemer
Do Green And Golden Bell Frogs Litoria Aurea Occupy Habitats With Fungicidal Properties?, C G. Threlfall, Dianne F. Jolley, N Evershed, R L. Goldingay, W A. Buttemer
Faculty of Science - Papers (Archive)
The Green and Golden Bell frog Utoria aurea is in major decline in Australia, where its distribution is now confined mainly to the east coast of New South Wales (NSW). Infection by the newly emerged amphibian fungal pathogen Batrachochytrium dendrobatidis has been identified as one of the main threats affecting L aureo. Surprisingly, some of the sites in NSW sustaining the largest populations of this species are industrial and urban habitats that are often disturbed and polluted, which could protect L aurea from chytrid infection if pollution had fungicidal capacity The aim of this study was to characterise the trace …
Deep-Sea Natural Products, Danielle Skropeta
Deep-Sea Natural Products, Danielle Skropeta
Faculty of Science - Papers (Archive)
This review covers the 390 novel marine natural products described to date from deep-water (>50 m)marine fauna, with details on the source organism, its depth and country of origin, along with anyreported biological activity of the metabolites. Relevant synthetic studies on the deep-sea naturalproducts have also been included.
A Re-Examination Of A Human Femur Found At The Blind River Site, East London, South Africa: Its Age, Morphology, And Breakage Pattern, Zenobia Jacobs, Qian Wang, David L. Roberts, P V. Tobias
A Re-Examination Of A Human Femur Found At The Blind River Site, East London, South Africa: Its Age, Morphology, And Breakage Pattern, Zenobia Jacobs, Qian Wang, David L. Roberts, P V. Tobias
Faculty of Science - Papers (Archive)
ABSTRACT Modern human femoral features might have appeared in the early Middle Stone Age (156 ka to 20 ka) in South Africa, as demonstrated by the recent re-examination of a human femur fossil found at the Blind River Site, East London in the 1930s, if new dating results hold. Two optically stimulated luminescence dates from the relocated original Blind River shallow marine/estuarine deposits that contained the femur gave almost identical ages of ~120 ka, corresponding to the early part of the Last Interglacial (Oxygen Isotope Stage 5). Overall, the slender headless femur is of modern human form. The distal epiphysis …
Exploiting The Borono-Mannich Reaction In Bioactive Alkaloid Synthesis, Stephen G. Pyne, Christopher Au, Andrew S. Davis, Ian R. Morgan, Thunwadee Ritthiwigrom, Arife Yazici
Exploiting The Borono-Mannich Reaction In Bioactive Alkaloid Synthesis, Stephen G. Pyne, Christopher Au, Andrew S. Davis, Ian R. Morgan, Thunwadee Ritthiwigrom, Arife Yazici
Faculty of Science - Papers (Archive)
We have demonstrated that the borono-Mannich reaction is a versatile and efficient reaction for the diastereoselective preparation of chiral 1,2-amino alcohols. These Mannich products are valuable starting materials as shown in this report by the synthesis of bioactive polyhydroxylated pyrrolizidine and indolizidine alkaloids. Initial studies, directed at the more complex Stemona alkaloids, using the borono-Mannich reaction on cyclic N-acyliminium ions are encouraging as demonstrated by the synthesis of the pyrido[1,2-a]azepine core structure of stemocurtisinol.
Enhanced Performance Of Dye Sensitized Solar Cells Utilizing Platinum Electrodeposit Counter Electrodes, Attila J. Mozer, George Tsekouras, Gordon G. Wallace
Enhanced Performance Of Dye Sensitized Solar Cells Utilizing Platinum Electrodeposit Counter Electrodes, Attila J. Mozer, George Tsekouras, Gordon G. Wallace
Faculty of Science - Papers (Archive)
Enhanced performance was observed for dye-sensitized solar cells (DSSCs) utilizing counter electrodes based on Pt electrodeposits compared to counter electrodes based on sputtered Pt. Scanning electron microscopy of Pt electrodeposits revealed that the use of an initial cathodic overpotential pulse followed by steady electrodeposition at a mild cathodic potential yielded ∼40nm particles, compared to ∼600nm particles when no such pulse was used. Cyclic voltammetry and electrochemical impedance spectroscopy (EIS) of electrode materials suggested that Pt electrodeposits would give enhanced performance as DSSC counter electrodes compared to sputtered Pt, and this was confirmed by device testing. EIS characterization of DSSCs under …
Assessing Soil Remobilisation In Catchments Using A 137 Cs-Sediment Hillslope Model, Ava D. Simms, Colin D. Woodroffe, Brian G. Jones, Henk Heijnis, Jennifer Harrison, Rob Mann
Assessing Soil Remobilisation In Catchments Using A 137 Cs-Sediment Hillslope Model, Ava D. Simms, Colin D. Woodroffe, Brian G. Jones, Henk Heijnis, Jennifer Harrison, Rob Mann
Faculty of Science - Papers (Archive)
Soil redistribution studies are important, especially in water supply catchments, because the rate at which denudation is occurring has implications for offsite water quality. However, the extent to which soil is redistributed within the landscape can be difficult to determine. This challenge can be overcome using fallout caesium-137 (137Cs). This paper describes the rates of soil loss and remobilisation in two sub-catchments within the Sydney Basin region, namely Kembla and Kentish Creeks, which drain to the Cordeaux reservoir. The total inventories of 137Cs in catchment soils were determined, a 137Cs-regression equation and a theoretical diffusion and migration …
Synthesis Of Castanospermine, Theeraphan Machan, Andrew S. Davis, Boonsom Liawruangrath, Stephen G. Pyne
Synthesis Of Castanospermine, Theeraphan Machan, Andrew S. Davis, Boonsom Liawruangrath, Stephen G. Pyne
Faculty of Science - Papers (Archive)
The diastereoselective synthesis of castanospermine is described in 11 synthetic steps from L-xylose. The borono-Mannich reaction between L-xylose, allylamine and (E)-styrene boronic acid gives a tetrahydroxy amine with the desired configurations for C-6, C-7, C-8 and C-8a in the target molecule. A novel pyrrolo[1,2-c]oxazol-3-one precursor was employed to allow for the control of pi-facial diastereoselectivity in an osmium(VIII)-catalysed syn-dihydroxylation (DH) reaction. A regioselective ring-opening of the cyclic sulfate derivative of the resulting diol then secured the C-1 hydroxyl group of castanospermine with the correct configuration. A Mitsunobu cyclization then provided di-O-benzyl castanospermine and …
Attachment Of Molecular Hydrogen To An Isolated Boron Cation: An Infrared And Ab Initio Study, Viktoras Dryza, Berwyck L. J Poad, Evan J. Bieske
Attachment Of Molecular Hydrogen To An Isolated Boron Cation: An Infrared And Ab Initio Study, Viktoras Dryza, Berwyck L. J Poad, Evan J. Bieske
Faculty of Science - Papers (Archive)
Structural properties of the B+−H2 electrostatic complex are investigated through its rotationally resolved infrared spectrum in the H−H stretch region (3905−3975 cm−1). The spectrum, which was obtained by monitoring B+ photofragments while the IR wavelength was scanned, is consistent with the complex having a T-shaped structure and a vibrationally averaged intermolecular separation of 2.26 Å, which decreases by 0.04 Å when the H2 subunit is vibrationally excited. The H−H stretch transition of B+−H2 is red-shifted by 220.6 ± 1.5 cm−1 from that of the free H2 molecule, much …
Removal Of Structurally Different Dyes In Submerged Membrane Fungi Reactor—Biosorption/Pac-Adsorption, Membrane Retention And Biodegradation, Faisal I. Hai, Kazuo Yamamoto, Fumiyuki Nakajima, Kensuke Fukushi
Removal Of Structurally Different Dyes In Submerged Membrane Fungi Reactor—Biosorption/Pac-Adsorption, Membrane Retention And Biodegradation, Faisal I. Hai, Kazuo Yamamoto, Fumiyuki Nakajima, Kensuke Fukushi
Faculty of Science - Papers (Archive)
The long-term performance of a submerged membrane fungi reactor was observed while a synthetic textile wastewater containing either or both of the two structurally different azo dyes was continuously fed. Compared to the Acid Orange II dye (simpler structure), higher biosorption but slower biodegradation of the polymeric dye (Poly S119) was observed in sterile batch tests. In the membrane bioreactor (MBR), although a relative abundance of fungi (66%) without any specific control of bacterial contamination could be maintained, unlike in pure fungus culture, enzymatic activity was below detection limit. Nevertheless, >99% removal of Poly S119 was consistently achieved under a …
Social Justice In The Forest: Aboriginal Engagement With Australia's Forest Industries, Sue Feary
Social Justice In The Forest: Aboriginal Engagement With Australia's Forest Industries, Sue Feary
Faculty of Science - Papers (Archive)
What remains of Australia’s native forests are important to Aboriginal people for environmental, cultural and economic reasons. Managers of forests in protected areas at State and Commonwealth levels have policies for involving Aboriginal people in forest management and for protecting the intangible and tangible values that Aboriginal people place on forests, but there are limited opportunities for significant economic returns to Aboriginal communities. Outside of conservation reserves, there are native timber production forests on crown land, plantations on private and public land and, forests on Aboriginal land, that offer a range of opportunities for Aboriginal people to engage with forest …
Complete Mitochondrial Genome Of The Frillneck Lizard (Chlamydosaurus Kingii, Reptilia; Agamidae), Another Squamate With Two Control Regions, Beata Ujvari, Thomas R. Madsen
Complete Mitochondrial Genome Of The Frillneck Lizard (Chlamydosaurus Kingii, Reptilia; Agamidae), Another Squamate With Two Control Regions, Beata Ujvari, Thomas R. Madsen
Faculty of Science - Papers (Archive)
AbstractUsing PCR, the complete mitochondrial genome was sequenced in three frillneck lizards (Chlamydosaurus kingii).The mitochondria spanned over 16,761 bp. As in other vertebrates, two rRNA genes, 22 tRNA genes and 13 protein codinggenes were identified. However, similar to some other squamate reptiles, two control regions (CRI and CRII) were identified,spanning 801 and 812 bp, respectively. Our results were compared with another Australian member of the family Agamidae,the bearded dragon (Pogana vitticeps). The overall base composition of the light-strand sequence largely mirrored thatobserved in P. vitticeps. Furthermore, similar to P. vitticeps, we observed an insertion 801 bp long between the ND5 …
From Shell To Cell: Neutron Scattering Studies Of Biological Water Dynamics And Coupling To Activity, A. Frölich, F. Gabel, M. Jasnin, U. Lehnert, D. Oesterhelt, A. Stadler, M. Tehei, M. Weik, K. Wood, G. Zaccai
From Shell To Cell: Neutron Scattering Studies Of Biological Water Dynamics And Coupling To Activity, A. Frölich, F. Gabel, M. Jasnin, U. Lehnert, D. Oesterhelt, A. Stadler, M. Tehei, M. Weik, K. Wood, G. Zaccai
Faculty of Science - Papers (Archive)
An integrated picture of hydration shell dynamics and of its coupling to functional macromolecular motions is proposed from studies on a soluble protein, on a membrane protein in its natural lipid environment, and on the intracellular environment in bacteria and red blood cells. Water dynamics in multimolar salt solutions was also examined, in the context of the very slow water component previously discovered in the cytoplasm of extreme halophilic archaea. The data were obtained from neutron scattering by using deuterium labelling to focus on the dynamics of different parts of the complex systems examined.
Antimalarial Activity Of 2,4-Diaminopyrimidines, J. Morgan, R. Haritakul, Paul A. Keller
Antimalarial Activity Of 2,4-Diaminopyrimidines, J. Morgan, R. Haritakul, Paul A. Keller
Faculty of Science - Papers (Archive)
A series of 2,4- and 4,6-diaminopyrimidines were prepared and evaluated for their in vitro antimalarial activity. Of the 12 compounds tested 7 showed reasonable activity with 1 having a sub-micromolar IC50.