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A Reagentless Thermal Post-Synthetic Rearrangement Of An Allyloxy-Tagged Metal-Organic Framework, Andrew D. Burrows, Sally O. Hunter, Mary F. Mahon, Christopher Richardson Jan 2013

A Reagentless Thermal Post-Synthetic Rearrangement Of An Allyloxy-Tagged Metal-Organic Framework, Andrew D. Burrows, Sally O. Hunter, Mary F. Mahon, Christopher Richardson

Faculty of Science - Papers (Archive)

Direct heating of a metal-organic framework provides a simple, controllable way of effecting a covalent post-synthetic modification. Herein we report that an allyloxy-tagged zinc metal-organic framework undergoes a thermally-promoted aromatic Claisen rearrangement through which the framework connectivity and porosity are maintained.


Induced Pluripotent Stem Cells As Tools For Disease Modelling And Drug Discovery In Alzheimer's Disease, Lezanne Ooi, Kuldip Sidhu, Anne Poljak, Greg Sutherland, Michael D. O'Connor, Perminder Sachdev, Gerald Munch Jan 2013

Induced Pluripotent Stem Cells As Tools For Disease Modelling And Drug Discovery In Alzheimer's Disease, Lezanne Ooi, Kuldip Sidhu, Anne Poljak, Greg Sutherland, Michael D. O'Connor, Perminder Sachdev, Gerald Munch

Faculty of Science - Papers (Archive)

Alzheimer’s disease (AD) is a progressive neurodegenerative brain disorder that leads to a progressive decline in a person’s memory and ability to communicate and carry out daily activities. The brain pathology in AD is characterized by extensive neuronal loss, particularly of cholinergic neurons, intracellular neurofibrillary tangles composed of the tau protein (NFTs) and extracellular deposition of plaques composed of β-amyloid (Aβ), a cleavage product of the amyloid precursor protein (APP). These two insoluble protein aggregates are accompanied by a chronic inflammatory response and extensive oxidative damage. Whereas dys-regulation of APP expression or processing appears to be important for ...


Ten Trenches: A Scienceart Collaboration, Timothy J. Cohen, Martin Cohen, Stephanie Kermode, Michael G. Leggett Jan 2013

Ten Trenches: A Scienceart Collaboration, Timothy J. Cohen, Martin Cohen, Stephanie Kermode, Michael G. Leggett

Faculty of Science - Papers (Archive)

Collaborative and cross-disciplinary research by a group of artists and scientists in an Australian rural setting generates data and ideas that form the basis of a wider understanding of the ramifications of global warming and cooling within the local, regional and national community. The work is viewed as an initial educational platform that will allow the public to see and understand the complexities of climate-based research.


Bryophyte Species Composition Over Moisture Gradients In The Windmill Islands, East Antarctica: Development Of A Baseline For Monitoring Climate Change Impacts, J Wasley, S A. Robinson, J D. Turnbull, D H. King, W Wanek, M Popp Oct 2012

Bryophyte Species Composition Over Moisture Gradients In The Windmill Islands, East Antarctica: Development Of A Baseline For Monitoring Climate Change Impacts, J Wasley, S A. Robinson, J D. Turnbull, D H. King, W Wanek, M Popp

Faculty of Science - Papers (Archive)

Extreme environmental conditions prevail on the Antarctic continent and limit plant diversity to cryptogamic communities, dominated by bryophytes and lichens. Even small abiotic shifts, associated with climate change, are likely to have pronounced impacts on these communities that currently exist at their physiological limit of survival. Changes to moisture availability, due to precipitation shifts or alterations to permanent snow reserves, will most likely cause greatest impact. In order to establish a baseline for determining the effect of climate change on continental Antarctic terrestrial communities and to better understand bryophyte species distributions in relation to moisture in a floristically important Antarctic ...


The Isolation Of Bioactive Flavonoids From Jacaranda Obtusifolia H. B. K. Ssp. Rhombifolia (G. F. W. Meijer) Gentry, Sorachai Khamsan, Saisunee Liawruangrath, Aphiwat Teerawutkulrag, Stephen G. Pyne, Mary J. Garson, Boonsom Liawruangrath Jun 2012

The Isolation Of Bioactive Flavonoids From Jacaranda Obtusifolia H. B. K. Ssp. Rhombifolia (G. F. W. Meijer) Gentry, Sorachai Khamsan, Saisunee Liawruangrath, Aphiwat Teerawutkulrag, Stephen G. Pyne, Mary J. Garson, Boonsom Liawruangrath

Faculty of Science - Papers (Archive)

The paper describes the bioassay-guided isolation, structure elucidation and anticancer evaluation of five flavonoids (-)-liquiritigenin (1), (-)-neoliquiritin (2), isoliquiritigenin (3), isoliquiritin (4) and formononetin (5) from the twigs of Jacaranda obtusifolia H. B. K. ssp. rhombifolia (G. F. W. Meijer) Gentry. The structures were elucidated based on 1H, 13C NMR, comprehensive 2D NMR, MS analyses and comparison with previously reported spectral data. Compounds 1 and 3 were demonstrated to be inhibitory in vitro against NCI-H187 (small cell lung cancer) with IC50 values of 30.1 and 16.6 μg mL-1, respectively. The isolates were non-cytotoxic to Vero cells (African green ...


Translocation Of The Eastern Bristlebird 1: Radio-Tracking Of Post-Release Movements, David Bain, Kris French, Jack Baker, Jean Clarke May 2012

Translocation Of The Eastern Bristlebird 1: Radio-Tracking Of Post-Release Movements, David Bain, Kris French, Jack Baker, Jean Clarke

Faculty of Science - Papers (Archive)

Translocating birds to a new area of habitat to restore or supplement depleted populations may pose a significant threat to the translocated individuals. While for many species, translocated individuals appear to move larger distances than resident animals, species with poor dispersal capacity may be restricted in movements and translocation methods may need to accommodate differences in movements to ensure success. In this study, designed to provide insights to inform our broader programme of translocations in New South Wales, Australia, we investigated post-release movements in the endangered, semi-flightless Eastern Bristlebird (Dasyornis brachypterus). We predicted that movements would be minimal, with few ...


Manufacturing On The Move? Beyond The High Dollar In The Debate About Making Things In Australia - The Case Of The Australian Surfboard Industry - Ausccer Discussion Paper No. 2012/2, Andrew Warren, Chris Gibson May 2012

Manufacturing On The Move? Beyond The High Dollar In The Debate About Making Things In Australia - The Case Of The Australian Surfboard Industry - Ausccer Discussion Paper No. 2012/2, Andrew Warren, Chris Gibson

Faculty of Science - Papers (Archive)

In October 2011 surfboard manufacturer BASE abruptly closed its factory on the Gold Coast resulting in the direct loss of 50 jobs. A few days later, nearby D’Arcy Surfboards also announced it was shedding workers and downsizing from a state-of-the art purpose built factory into a backyard workshop. Each business exported surfboards internationally and employed some of Australia’s best known surfboard-makers. The troubles facing these workshops added to those brewing at the very same in Australia’s steel, aluminium, automotive and garment industries. With renewed public debate and media commentary on the future of manufacturing, we now face ...


Process-Evaluation Of Tropospheric Humidity Simulated By General Circulation Models Using Water Vapor Isotopologues: 1. Comparison Between Models And Observations, Camille Risi, David Noone, John Worden, Christian Frankenberg, Gabriele Stiller, Michael Kiefer, Bernd Funke, Kaley Walker, Peter Bernath, Matthias Schneider, Debra Wunch, Vanessa Sherlock, Nicholas M. Deutscher, David W. Griffith, Paul O. Wennberg, Kimberly Strong, Dan Smale, Emmanuel Mahieu, Sabine Barthlott, Frank Hase, Omar Garcia, Justus Notholt, Thorsten Warneke, Geoffrey Toon, David Sayres, Sandrine Bony, Jeonghoon Lee, Derek Brown, Ryu Uemura, Christophe Sturm Mar 2012

Process-Evaluation Of Tropospheric Humidity Simulated By General Circulation Models Using Water Vapor Isotopologues: 1. Comparison Between Models And Observations, Camille Risi, David Noone, John Worden, Christian Frankenberg, Gabriele Stiller, Michael Kiefer, Bernd Funke, Kaley Walker, Peter Bernath, Matthias Schneider, Debra Wunch, Vanessa Sherlock, Nicholas M. Deutscher, David W. Griffith, Paul O. Wennberg, Kimberly Strong, Dan Smale, Emmanuel Mahieu, Sabine Barthlott, Frank Hase, Omar Garcia, Justus Notholt, Thorsten Warneke, Geoffrey Toon, David Sayres, Sandrine Bony, Jeonghoon Lee, Derek Brown, Ryu Uemura, Christophe Sturm

Faculty of Science - Papers (Archive)

[1] The goal of this study is to determine how H2O and HDO measurements in water vapor can be used to detect and diagnose biases in the representation of processes controlling tropospheric humidity in atmospheric general circulation models (GCMs). We analyze a large number of isotopic data sets (four satellite, sixteen ground-based remote-sensing, five surface in situ and three aircraft data sets) that are sensitive to different altitudes throughout the free troposphere. Despite significant differences between data sets, we identify some observed HDO/H2O characteristics that are robust across data sets and that can be used to evaluate models. We ...


The Role Of Streptokinase As A Virulence Determinant Of Streptococcus Pyogenes - Potential For Therapeutic Targeting, Jason D. Mcarthur, Simon M. Cook, Carola Venturini, Mark J. Walker Mar 2012

The Role Of Streptokinase As A Virulence Determinant Of Streptococcus Pyogenes - Potential For Therapeutic Targeting, Jason D. Mcarthur, Simon M. Cook, Carola Venturini, Mark J. Walker

Faculty of Science - Papers (Archive)

Streptococcus pyogenes is a major human pathogen responsible for numerous diseases ranging from uncomplicated skin and throat infections to severe, life threatening invasive disease such as necrotising fasciitis and streptococcal toxic shock syndrome. These severe invasive infections progress rapidly and produce high rates of morbidity and mortality despite the implementation of aggressive treatment plans. The activation of plasminogen and the acquisition of plasmin activity at the bacterial cell surface is critical for the invasive pathogenesis of this organism. To facilitate this process, S. pyogenes secrete streptokinase, a potent plasminogen activating protein. Here, we describe the role of streptokinase in invasive ...


Seed Bank Persistence And Climate Change, Mark K. J Ooi Feb 2012

Seed Bank Persistence And Climate Change, Mark K. J Ooi

Faculty of Science - Papers (Archive)

"The strong mechanistic relationship between climatic factors and seed dormancy and germination suggests that forecast climatic changes will significantly affect seed bank persistence. This review focuses on the potential impact of changing temperature, rainfall and fire regimes on the longevity of long-term persistent seed-banks. Currently, there are few studies investigating the mechanistic responses of demographic processes, such as seed-bank dynamics, to forecast climate change. However, from the work that has been published, several key points have been highlighted. First, increased air temperatures will produce significantly higher soil temperatures in open and sparsely vegetated habitats. Some evidence shows that this could ...


Architecture And Conservation Of The Bacterial Dna Replication Machinery, An Underexploited Drug Target, Andrew Robinson, Rebecca J. Causer, Nicholas E. Dixon Jan 2012

Architecture And Conservation Of The Bacterial Dna Replication Machinery, An Underexploited Drug Target, Andrew Robinson, Rebecca J. Causer, Nicholas E. Dixon

Faculty of Science - Papers (Archive)

"New antibiotics with novel modes of action are required to combat the growing threat posed by multi-drug resistant bacteria. Over the last decade, genome sequencing and other high-throughput techniques have provided tremendous insight into the molecular processes underlying cellular functions in a wide range of bacterial species. We can now use these data to assess the degree of conservation of certain aspects of bacterial physiology, to help choose the best cellular targets for development of new broad-spectrum antibacterials. DNA replication is a conserved and essential process, and the large number of proteins that interact to replicate DNA in bacteria are ...


Seasonal Field Metabolic Rate And Water Influx Of Captive-Bred Reintroduced Yellow-Footed Rock-Wallabies (Petrogale Xanthopus Celeris), Steven J. Lapidge, Adam J. Munn Jan 2012

Seasonal Field Metabolic Rate And Water Influx Of Captive-Bred Reintroduced Yellow-Footed Rock-Wallabies (Petrogale Xanthopus Celeris), Steven J. Lapidge, Adam J. Munn

Faculty of Science - Papers (Archive)

Captive breeding and release is a tool used by conservation biologists to re-establish populations of endangered or locally extinct species. Reintroduced animals that have been bred in captivity must learn to meet the challenges posed by free living, and to adjust to local environmental conditions, food and water sources. How well reintroduced animals might meet these challenges is uncertain as few longitudinal studies have investigated the physiology of reintroduced animals or the implications of this for successful establishment of new populations. Here we have evaluated long-term, seasonal energy and water use by reintroduced yellow-footed rock-wallabies (Petrogale xanthopus celeris), an endangered ...


Comparison Of Chemical Constituents And Antibacterial Activities And Antioxidant Activities Of The Essential Oil From Leaves And Fruits Of Bridelia Retusa (L.) A. Juss, D Sanseera, W Niwatananun, Saisunee Liawruangrath, Apiwat Baramee, Banyong Khantawa, Stephen G. Pyne, Boonsom Liawruangrath Jan 2012

Comparison Of Chemical Constituents And Antibacterial Activities And Antioxidant Activities Of The Essential Oil From Leaves And Fruits Of Bridelia Retusa (L.) A. Juss, D Sanseera, W Niwatananun, Saisunee Liawruangrath, Apiwat Baramee, Banyong Khantawa, Stephen G. Pyne, Boonsom Liawruangrath

Faculty of Science - Papers (Archive)

The essential oils from the leaves and fruits of Bridelia retusa (L.) A.Juss. were isolated by hydrodistillation. The essential oils were obtained in 0.0013% yield as a pale yellow liquid and 0.0026% yield as a violet-light brown liquid for the leaf oil and fruit oil respectively. The composition of each essential oil was analysed by means of GC-(FID) and GC-MS. Eleven constituents accounting for 48.77% of total leaves oil were identified. The most abundant compound was phytol (33.4%), followed by phthalic acid (5.2%), 6, 13-dimethoxy-2, 3, 9, 10-tetramethylpentacene-1, 4, 8, 11-tetrone (3.4 ...


Comment On The Ionization Energy Of B2f4, Bun Chan, Adam J. Trevitt, Stephen J. Blanksby, Leo Radom Jan 2012

Comment On The Ionization Energy Of B2f4, Bun Chan, Adam J. Trevitt, Stephen J. Blanksby, Leo Radom

Faculty of Science - Papers (Archive)

The Gn test sets(1) of accurate (uncertainty ≤ 1 kcal mol–1 ≈ 4 kJ mol–1) experimental data are widely employed in the development and assessment of quantum chemistry procedures. However, while all the data in the Gn sets nominally carry a sub-kcal mol–1 uncertainty, several of the experimental values show uncharacteristically large discrepancies when compared with values determined by high-level theoretical calculations. One of these questionable values is the adiabatic ionization energy (IE) of B2F4, for which the theoretical values calculated, for example, with the high-level G2 (1133.9, kJ mol–1),(1b) G3 (1135.4 kJ mol ...


Preparation Of Ordered Tio2 Macroporous Membrane Using Pbma Colloid Crystal As Template, Hongzhong Zhang, Feng Dong, Shengnan Zhai, Xuejing Kang, Shaoming Fang Jan 2012

Preparation Of Ordered Tio2 Macroporous Membrane Using Pbma Colloid Crystal As Template, Hongzhong Zhang, Feng Dong, Shengnan Zhai, Xuejing Kang, Shaoming Fang

Faculty of Science - Papers (Archive)

Poly(butyl methacrylate) (PBMA) colloidal crystal templates were assembled orderly on the clean substrates of monocrystalline silicon by dip-drawing technique and titanium dioxide (TiO2) macroporous membranes were prepared by using sol-dipping template method to fill the interstices among the PBMA templates, followed by calcination to remove the templates at 550℃. Calcination of the PBMA templates was carried out according to the following procedure: the rate of rising temperature was 5℃/min from room temperature to 150℃, 2℃/min from 150℃ to 270℃, 1℃ /min from 270℃ to 430℃, 2℃/min from 430℃ to 550℃ and maintained it at 550℃ for ...


A Pluvial Episode Identified In Arid Australia During The Medieval Climatic Anomaly, T J. Cohen, G C. Nanson, J D. Jansen, L A. Gliganic, J.-H May, J R. Larsen, I D. Goodwin, S Browning, D M. Price Jan 2012

A Pluvial Episode Identified In Arid Australia During The Medieval Climatic Anomaly, T J. Cohen, G C. Nanson, J D. Jansen, L A. Gliganic, J.-H May, J R. Larsen, I D. Goodwin, S Browning, D M. Price

Faculty of Science - Papers (Archive)

Optically stimulated luminescence (OSL) ages from a relict shoreline on Lake Callabonna record a major pluvial episode in southern central Australia between 1050 ± 70 and 1100 ± 60 Common Era (CE), within the Medieval Climatic Anomaly (MCA). During this pluvial interval Lake Callabonna filled to 10–12 times the volume of the largest historical filling (1974) and reached maximum depths of 4–5 m, compared to the 0.5–1.0 m achieved today. Until now there has been no direct evidence for the MCA in the arid interior of Australia. A multi-proxy, analogue-based atmospheric circulation reconstruction indicates that the pluvial ...


The Synthesis, Structures And Reactions Of Zinc And Cobalt Metal-Organic Frameworks Incorporating An Alkyne-Based Dicarboxylate Linker, Andrew D. Burrows, L C. Fisher, David M. Hodgson, Mary F. Mahon, Naomi Cessford, Tina Duren, Christopher Richardson, S P. Rigby Jan 2012

The Synthesis, Structures And Reactions Of Zinc And Cobalt Metal-Organic Frameworks Incorporating An Alkyne-Based Dicarboxylate Linker, Andrew D. Burrows, L C. Fisher, David M. Hodgson, Mary F. Mahon, Naomi Cessford, Tina Duren, Christopher Richardson, S P. Rigby

Faculty of Science - Papers (Archive)

The reaction of zinc(II) nitrate and 4,4′-ethynylenedibenzoic acid (H2edb) in DMF at 80 °C gave the metal–organic framework material [Zn4O(edb)3(H2O)2]·6DMF 1 in which edb ligands connect Zn4O centres into a doubly-interpenetrated cubic network with a similar topology to observed with other linear dicarboxylates in the IRMOF series. Analysis of the nitrogen isotherm revealed the material to have a BET surface area of 1088 m2 g−1, which is approximately one-third of the value calculated from GCMC simulations, suggesting incomplete activation or pore ...


Synthesis, Properties And Water Permeability Of Swnt Buckypapers, L J. Sweetman, L Nghiem, I Chironi, G Triani, Marc In Het Panhuis, St F. Ralph Jan 2012

Synthesis, Properties And Water Permeability Of Swnt Buckypapers, L J. Sweetman, L Nghiem, I Chironi, G Triani, Marc In Het Panhuis, St F. Ralph

Faculty of Science - Papers (Archive)

The ability of macrocyclic ligands to facilitate formation of dispersions of single-walled carbon nanotubes (SWNTs) was investigated using a combination of absorption spectrophotometry and optical microscopy. Vacuum filtration of aqueous dispersions containing SWNTs and various macrocyclic ligands (derivatised porphyrin, phthalocyanine, cyclodextrin and calixarene) afforded self-supporting membranes known as buckypapers. Microanalytical data and energy dispersive X-ray spectra were obtained for these buckypapers and provided evidence for retention of the macrocyclic ligands within the structure of the membranes. The electrical conductivities of the membranes varied between 30 ± 20 and 220 ± 60 S cm−1, while contact angle analysis revealed they all possessed ...


Remote Sensing Of Co2 And Ch4 Using Solar Absorption Spectrometry With A Low Resolution Spectrometer, C Petri, T Warneke, N Jones, T Ridder, J Messerschmidt, T Weinzierl, M Geibel, J Notholt Jan 2012

Remote Sensing Of Co2 And Ch4 Using Solar Absorption Spectrometry With A Low Resolution Spectrometer, C Petri, T Warneke, N Jones, T Ridder, J Messerschmidt, T Weinzierl, M Geibel, J Notholt

Faculty of Science - Papers (Archive)

Throughout the last few years solar absorption Fourier Transform Spectrometry (FTS) has been further developed to measure the total columns of CO2 and CH4. The observations are performed at high spectral resolution, typically at 0.02 cm(-1). The precision currently achieved is generally better than 0.25%. However, these high resolution instruments are quite large and need a dedicated room or container for installation. We performed these observations using a smaller commercial interferometer at its maximum possible resolution of 0.11 cm(-1). The measurements have been performed at Bremen and have been compared to observations using our high ...


Observed And Simulated Time Evolution Of Hcl, Clono2, And Hf Total Column Abundances, R Kohlhepp, R Ruhnke, M P Chipperfield, M De Maziere, J Notholt, S Barthlott, R L. Batchelor, R D. Blatherwick, Th Blumenstock, M T. Coffey, P Demoulin, H Fast, W Feng, A Goldman, D W. T Griffith, K Hamann, J W. Hannigan, F Hase, N B. Jones, A Kagawa, I Kaiser, Y Kasai, O Kirner, W Kouker, R Lindenmaier, E Mahieu, R L. Mittermeier, B Monge-Sanz, I Morino, I Murata, H Nakajima, M Palm, Clare Paton-Walsh, U Raffalski, Th Reddmann, M Rettinger, C P. Rinsland, E Rozanov, M Schneider, C Senten, C Servais, B M. Sinnhuber, D Smale, K Strong, R Sussmann, J R. Taylor, G Vanhaelewyn, T Warneke, C Whaley, M Wiehle, S W. Wood Jan 2012

Observed And Simulated Time Evolution Of Hcl, Clono2, And Hf Total Column Abundances, R Kohlhepp, R Ruhnke, M P Chipperfield, M De Maziere, J Notholt, S Barthlott, R L. Batchelor, R D. Blatherwick, Th Blumenstock, M T. Coffey, P Demoulin, H Fast, W Feng, A Goldman, D W. T Griffith, K Hamann, J W. Hannigan, F Hase, N B. Jones, A Kagawa, I Kaiser, Y Kasai, O Kirner, W Kouker, R Lindenmaier, E Mahieu, R L. Mittermeier, B Monge-Sanz, I Morino, I Murata, H Nakajima, M Palm, Clare Paton-Walsh, U Raffalski, Th Reddmann, M Rettinger, C P. Rinsland, E Rozanov, M Schneider, C Senten, C Servais, B M. Sinnhuber, D Smale, K Strong, R Sussmann, J R. Taylor, G Vanhaelewyn, T Warneke, C Whaley, M Wiehle, S W. Wood

Faculty of Science - Papers (Archive)

Time series of total column abundances of hydrogen chloride (HCl), chlorine nitrate (ClONO2), and hydrogen fluoride (HF) were determined from ground-based Fourier transform infrared (FTIR) spectra recorded at 17 sites belonging to the Network for the Detection of Atmospheric Composition Change (NDACC) and located between 80.05° N and 77.82° S. By providing such a near-global overview on ground-based measurements of the two major stratospheric chlorine reservoir species, HCl and ClONO2, the present study is able to confirm the decrease of the atmospheric inorganic chlorine abundance during the last few years. This decrease is expected following the 1987 Montreal ...


Characterization Of Gellan Gum By Capillary Electrophoresis, Danielle L. Taylor, Cameron J. Ferris, Alison R. Maniego, Patrice Castignolles, Marc In Het Panhuis, Marianne Gaborieau Jan 2012

Characterization Of Gellan Gum By Capillary Electrophoresis, Danielle L. Taylor, Cameron J. Ferris, Alison R. Maniego, Patrice Castignolles, Marc In Het Panhuis, Marianne Gaborieau

Faculty of Science - Papers (Archive)

Gellan gums were characterised for the first time using free-solution capillary electrophoresis (CE) or CE under critical conditions (CE-CC). CE-CC is a fast method that separates the polysaccharide. Gellan gums are shown to be heterogeneous in terms of their electrophoretic mobility at 55°C revealing: oligomer peak(s), broad peaks of polymers with a random coil conformation with different degrees of acylation (composition), aggregates, and polymers with double-helix conformation. CE-CC is complementary with the rheological analysis also performed in this work. Sonication of gellan gums is shown to decrease the viscosity of gellan gum mainly by breaking up aggregates. The ...


Radiocarbon Bomb Spike Reveals Biological Effects Of Antarctic Climate Change, Laurence J Clarke, Sharon A. Robinson, Quan Hua, David J. Ayre, David Fink Jan 2012

Radiocarbon Bomb Spike Reveals Biological Effects Of Antarctic Climate Change, Laurence J Clarke, Sharon A. Robinson, Quan Hua, David J. Ayre, David Fink

Faculty of Science - Papers (Archive)

The Antarctic has experienced major changes in temperature, wind speed and stratospheric ozone levels during thelast 50 years. However, until recently continental Antarctica appeared to be little impacted by climate warming, thusbiological changes were predicted to be relatively slow. Detecting the biological effects of Antarctic climate changehas been hindered by the paucity of long-term data sets, particularly for organisms that have been exposed to thesechanges throughout their lives. We show that radiocarbon signals are preserved along shoots of the dominant Antarcticmoss flora and use these to determine accurate growth rates over a period of several decades, allowing us toexplore the ...


Land Management Practices Associated With House Loss In Wildfires, Philip Gibbons, Linda Van Bommel, A Malcolm Gill, Geoffrey J. Cary, Don A. Driscoll, Ross A. Bradstock, Emma Knight, Max A. Moritz, Scott L. Stephens, David B. Lindenmayer Jan 2012

Land Management Practices Associated With House Loss In Wildfires, Philip Gibbons, Linda Van Bommel, A Malcolm Gill, Geoffrey J. Cary, Don A. Driscoll, Ross A. Bradstock, Emma Knight, Max A. Moritz, Scott L. Stephens, David B. Lindenmayer

Faculty of Science - Papers (Archive)

Losses to life and property from unplanned fires (wildfires) are forecast to increase because of population growth in periurban areas and climate change. In response, there have been moves to increase fuel reduction—clearing, prescribed burning, biomass removal and grazing—to afford greater protection to peri-urban communities in fire-prone regions. But how effective are these measures? Severe wildfires in southern Australia in 2009 presented a rare opportunity to address this question empirically. We predicted that modifying several fuels could theoretically reduce house loss by 76%–97%, which would translate to considerably fewer wildfire-related deaths. However, maximum levels of fuel reduction ...


A Reply To The Comments By Thomsen Et Al. On "Luminescence Dating Of K-Feldspar From Sediments: A Protocol Without Anomalous Fading Correction", Bo Li, Shenghua Li Jan 2012

A Reply To The Comments By Thomsen Et Al. On "Luminescence Dating Of K-Feldspar From Sediments: A Protocol Without Anomalous Fading Correction", Bo Li, Shenghua Li

Faculty of Science - Papers (Archive)

We are pleased that Thomsen et al. (2012) has tested our newly proposed multi-elevated-temperature post-IR IRSL (MET-pIRIR) procedure (Li and Li, 2011) using their own samples, which provides an independent test on the validity of this procedure. In their study, Thomsen et al. (2012) found that the METpIRIR procedure gave consistent results with the two-step post-IR IRSL (TS-pIRIR) procedure originally proposed by [Thomsen et al., 2008] and [Buylaert et al., 2009] and Thiel et al. (2010), indicating the validity of both methods for their samples investigated. Based on this observation, they argued that the MET-pIRIR procedure has no advantage over ...


Long-Range Correlations In Fourier Transform Infrared, Satellite, And Modeled Co In The Southern Hemisphere, Olaf Morgenstern, Guang Zeng, Stephen W. Wood, John Robinson, Dan Smale, Clare Paton-Walsh, Nicholas B. Jones, David W. T Griffith Jan 2012

Long-Range Correlations In Fourier Transform Infrared, Satellite, And Modeled Co In The Southern Hemisphere, Olaf Morgenstern, Guang Zeng, Stephen W. Wood, John Robinson, Dan Smale, Clare Paton-Walsh, Nicholas B. Jones, David W. T Griffith

Faculty of Science - Papers (Archive)

We use Fourier transfonn infrared ground-based measurements and satellite and model data to assess long-range correlations in tropospheric carbon monoxide. We fmd that CO columns measured in New Zealand correlate well with those measured in Antarctica, if a transport-related lag is taken into account. The model suggests that this long-range correlation is part of a mode of anomalous CO comprising almost the whole southern extratropics, which is linked to biomass burning in the southern continents. No such mode is modeled for the Northern Hemisphere. The area of long-range correlations maximizes for the southern subtropical Pacific, which is identified as an ...


Self-Assembled Gels From Biological And Synthetic Polyelectrolytes, Paul Calvert, Skander Limem, Don Mccallum, Gordon G. Wallace, Marc In Het Panhuis Jan 2012

Self-Assembled Gels From Biological And Synthetic Polyelectrolytes, Paul Calvert, Skander Limem, Don Mccallum, Gordon G. Wallace, Marc In Het Panhuis

Faculty of Science - Papers (Archive)

Inkjet printing of alternate layers of anionic and cationic polyelectrolytes allows organized gels to form with structures similar to those made by layer--by-layer dipping methods but very much faster. Structures of gels formed using slow and fast inkjet printing systems are compared using elemental analysis, swelling and diffusion kinetics as characterization methods. After printing and washing, most sodium or chloride counter-ions are last from the gel, leave only the polymer complex. The swelling properties of the printed and washed gel depend on the deposition rate and on the ratio of the two polymers as originally printed. The synthetic polyelectrolytes reported ...


Driving, Cities And Changing Climates, Gordon R. Waitt, Theresa Harada Jan 2012

Driving, Cities And Changing Climates, Gordon R. Waitt, Theresa Harada

Faculty of Science - Papers (Archive)

The relevance of cars in relation to changing climates seems indisputable: scientific evidence points out the significant contribution of cars globally in causing greenhouse gas emissions. Despite higher levels of general public understanding and concern about climate change, this has not generally resulted in decreased car use. This paper outlines how a spatial perspective drawing on a cultural economy approach may provide insights into the paradox of the environmental ‘value action gap’ by focusing on suburban belongings, passions and anticipations derived from driving. Drawing on insights from Burraneer Bay, an affluent Sydney suburb, the paper illustrates how habituated and embodied ...


Coral Reefs And Reef Islands Of The Amirantes Archipelago, Western Indian Ocean, Sarah Hamylton, Tom Spencer, Annelise B. Hagan Jan 2012

Coral Reefs And Reef Islands Of The Amirantes Archipelago, Western Indian Ocean, Sarah Hamylton, Tom Spencer, Annelise B. Hagan

Faculty of Science - Papers (Archive)

No abstract provided.


Inorganic Arsenic And Iron(Ii) Distributions In Sediment Porewaters Investigated By A Combined Dgt - Colourimetric Det Technique, William Bennett, Peter R. Teasdale, David T. Welsh, Jarad Panther, Ryan R. Stewart, Helen L. Price, Dianne F. Jolley Jan 2012

Inorganic Arsenic And Iron(Ii) Distributions In Sediment Porewaters Investigated By A Combined Dgt - Colourimetric Det Technique, William Bennett, Peter R. Teasdale, David T. Welsh, Jarad Panther, Ryan R. Stewart, Helen L. Price, Dianne F. Jolley

Faculty of Science - Papers (Archive)

No abstract provided.


Electrical And Mechanical Characteristics Of Buckypapers And Evaporative Cast Films Prepared Using Single And Multi-Walled Carbon Nanotubes And The Biopolymer Carrageenan, Ali Aldalbahi, Marc In Het Panhuis Jan 2012

Electrical And Mechanical Characteristics Of Buckypapers And Evaporative Cast Films Prepared Using Single And Multi-Walled Carbon Nanotubes And The Biopolymer Carrageenan, Ali Aldalbahi, Marc In Het Panhuis

Faculty of Science - Papers (Archive)

The electrical and mechanical characteristics of composite materials prepared using evaporative casting and vacuum filtration of carbon nanotubes (CNTs) dispersed in the biopolymer s-carrageenan (IC) are reported. It is demonstrated that the contact angle of water with films is proportional to the CNT mass and volume fraction, which is used to compare the properties of buckypapers with those of evaporative cast films. Multi-walled carbon nanotube films were found to exhibit higher conductivity values compared to those observed for single-walled carbon nanotubes composites at comparable contact angle values up to true nanotube volume fraction of 0.12. Buckypapers prepared by varying ...