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Full-Text Articles in Social and Behavioral Sciences

Two Cys Or Not Two Cys? That Is The Question; Alternative Oxidase In The Thermogenic Plant Sacred Lotus, Nicole M. Grant, Yoshihiko Onda, Yusuke Kakizaki, Kkikukatsu Ito, Jennifer R. Watling, Sharon A. Robinson Jun 2009

Two Cys Or Not Two Cys? That Is The Question; Alternative Oxidase In The Thermogenic Plant Sacred Lotus, Nicole M. Grant, Yoshihiko Onda, Yusuke Kakizaki, Kkikukatsu Ito, Jennifer R. Watling, Sharon A. Robinson

Faculty of Science - Papers (Archive)

Sacred lotus (Nelumbo nucifera) regulates temperature in its floral chamber to 32°C to 35°C across ambient temperatures of 8°C to 40°C with heating achieved through high alternative pathway fluxes. In most alternative oxidase (AOX) isoforms, two cysteine residues, Cys1 and Cys2, are highly conserved and play a role in posttranslational regulation of AOX. Further control occurs via interaction of reduced Cys1 with α-keto acids, such as pyruvate. Here, we report on the in vitro regulation of AOX isolated from thermogenic receptacle tissues of sacred lotus. AOX protein was mostly present in the reduced ...


Source Regions For Co2 At Cape Point Assessed By Modelling, 222rn And Meteorological Data, S. Whittlestone, E. Kowalczyk, E.-G Brunke, C. Labuschagne Jun 2009

Source Regions For Co2 At Cape Point Assessed By Modelling, 222rn And Meteorological Data, S. Whittlestone, E. Kowalczyk, E.-G Brunke, C. Labuschagne

Faculty of Science - Papers (Archive)

This study explores methods of characterising experimental and modelling data to see if trace gas measurements at the Cape Point GAW station could improve our understanding of sources from the continent. Selection criteria have been defined which make it possible to divide the samples into categories with predominant transport to Cape Point from one of four source regions: City (greater Cape Town); close rural (within about 150 km of Cape Point); distant rural (from 150 to about 500 km) and very distant rural covering the rest of southern Africa. For species with fairly uniform source such as radon or CO ...


Genetic Structure Of East Antarctic Populations Of The Moss Ceratodon Purpureus, L. J. Clarke, D. J. Ayre, Sharon A. Robinson Feb 2009

Genetic Structure Of East Antarctic Populations Of The Moss Ceratodon Purpureus, L. J. Clarke, D. J. Ayre, Sharon A. Robinson

Faculty of Science - Papers (Archive)

The capacity of the polar flora to adapt is of increasing concern given current and predicted environmental change in these regions. Previous genetic studies of Antarctic mosses have been of limited value due to a lack of variation in the markers or non-specificity of the methods used. We examined the power of five microsatellite loci developed for the cosmopolitan moss Ceratodon purpureus to detect genetically distinct clones and infer the distribution of clones within and among populations from the Windmill Islands, East Antarctica. Our microsatellite data suggest extraordinarily high levels of variation reported in RAPD studies were artificially elevated by ...


Accumulation Of Dna Damage In Antarctic Mosses: Correlations With Ultraviolet-B Radiation, Temperature And Turf Water Content Vary Amongst Species, J. D. Turnbull, Sharon A. Robinson Feb 2009

Accumulation Of Dna Damage In Antarctic Mosses: Correlations With Ultraviolet-B Radiation, Temperature And Turf Water Content Vary Amongst Species, J. D. Turnbull, Sharon A. Robinson

Faculty of Science - Papers (Archive)

The susceptibility of three East Antarctic moss species to UV-B radiation was examined by measuring accumulation of cyclobutane pyrimidine dimers under natural sunlight during the austral summer season of 2002/03. The 2002/03 season was characterised by unusually low springtime ozone depletion and as such our results likely underestimate the DNA damage possible in a more typical UV-B radiation season. Despite this all three species accumulated significant DNA photoproducts. We also found a positive association between photoproduct accumulation and incident UV-B radiation in the two cosmopolitan species, Bryum pseudotriquetrum and Ceratodon purpureus, with more DNA damage in samples collected ...


Invasion And Management Of A Woody Plant, Lantana Camara L., Alters Vegetation Diversity Within Wet Sclerophyll Forest In Southeastern Australia, Ben Gooden, Kris French, Peter J. Turner Jan 2009

Invasion And Management Of A Woody Plant, Lantana Camara L., Alters Vegetation Diversity Within Wet Sclerophyll Forest In Southeastern Australia, Ben Gooden, Kris French, Peter J. Turner

Faculty of Science - Papers (Archive)

Plant invasions of natural communities are commonly associated with reduced species diversity and altered ecosystem structure and function. This study investigated the effects of invasion and management of the woody shrub Lantana camara (lantana) in wet sclerophyll forest on the south-east coast of Australia. The effects of L. camara invasion and management on resident vegetation diversity and recruitment were determined as well as if invader management initiated community recovery. Vascular plant species richness, abundance and composition were surveyed and compared across L. camara invaded, non-invaded and managed sites following L. camara removal during a previous control event by land managers ...


Murray-Darling Basin Freshwater Shells: Riverine Reservoir Effect, Richard Gillespie, David Fink, Fiona Petchey, Geraldine Jacobsen Jan 2009

Murray-Darling Basin Freshwater Shells: Riverine Reservoir Effect, Richard Gillespie, David Fink, Fiona Petchey, Geraldine Jacobsen

Faculty of Science - Papers (Archive)

We report ciirbon isotope measurements on pre-bomb museum samples of freshwater mussel shells collected alive from riverine locations in New South Wales. Australia. The calculated reservoir ages, rimglng from -60 to +112 years, are much smaller than those for Australian marine shells and not considered significant for the radiocarbon dating of Late Pleistocene freshwater shells from the Murray-Darling Ba,sin.


Impact Threshold For An Alien Plant Invader, Lantana Camara L., On Native Plant Communities, Ben Gooden, Kris French, Peter J. Turner, Paul O. Downey Jan 2009

Impact Threshold For An Alien Plant Invader, Lantana Camara L., On Native Plant Communities, Ben Gooden, Kris French, Peter J. Turner, Paul O. Downey

Faculty of Science - Papers (Archive)

Alien plant invaders significantly threaten native community diversity, although it is poorly understood whether invasion initiates a linear or non-linear loss of resident species. Where low abundances of an invader have little impact on native species diversity, then a threshold level may exist, above which native communities rapidly decline. Our aim was to assess the broadscale effects of an alien thicket-forming shrub, lantana (Lantana camara L.), on wet sclerophyll forest in southeastern Australia. Vascular plant species richness, abundance and composition were measured and compared along a gradient of lantana invasion. There was a strong negative non-linear relationship between native species ...


The Major Toxin From The Australian Common Brown Snake Is A Hexamer With Unusual Gas-Phase Dissociation Properties, Andrew Aquilina Jan 2009

The Major Toxin From The Australian Common Brown Snake Is A Hexamer With Unusual Gas-Phase Dissociation Properties, Andrew Aquilina

Faculty of Science - Papers (Archive)

Asymmetric dissociation of multiply charged proteins assemblies has been frequently reported. This phenomenon, which relies on the dissociation of one or more highly charged monomers, has been shown to provide insights into the structure and organization of large monodisperse and polydisperse assemblies. Here, the process of asymmetric dissociation is investigated using the multi-subunit protein, textilotoxin, which has unusually high structural constraints on its monomers due to multiple disulfide linkages. Initially, it is shown that, contrary to previous reports, textilotoxin is made up of 6, rather than 5 subunits. Furthermore, the hexamer exists as two isoforms, one of which is substantially ...


A Bio-Inspired Molecular Water Oxidation Catalyst For Renewable Hydrogen Generation: An Examination Of Salt Effects, Robin Brimblecombe, Miriam Rotstein, Annette Koo, G Charles Dismukes, Gerhard F. Swiegers, Leone Spiccia Jan 2009

A Bio-Inspired Molecular Water Oxidation Catalyst For Renewable Hydrogen Generation: An Examination Of Salt Effects, Robin Brimblecombe, Miriam Rotstein, Annette Koo, G Charles Dismukes, Gerhard F. Swiegers, Leone Spiccia

Faculty of Science - Papers (Archive)

Most transport fuels are derived from fossil fuels, generate greenhouse gases, and consume significant amounts of water in the extraction, purification, and/or burning processes. The generation of hydrogen using solar energy to split water, ideally from abundant water sources such as sea water or other non-potable sources, could potentially provide an unlimited, clean fuel for the future. Solar, electrochemical water splitting typically combines a photoanode at which water oxidation occurs, with a cathode for proton reduction to hydrogen. In recent work, we have found that a bioinspired tetra-manganese cluster catalyzes water oxidation at relatively low overpotentials (0.38 V ...


Structural Revision Of Stemoburkilline From An E-Alkene To A Z-Alkene, Kwankamol Sastraruji, Stephen G. Pyne, Alison T. Ung, Pitchaya Mungkornawawakul, Wilford Lie, Araya Jatisatienr Jan 2009

Structural Revision Of Stemoburkilline From An E-Alkene To A Z-Alkene, Kwankamol Sastraruji, Stephen G. Pyne, Alison T. Ung, Pitchaya Mungkornawawakul, Wilford Lie, Araya Jatisatienr

Faculty of Science - Papers (Archive)

Semisynthesis studies starting from (11Z)-I',2'-didehydrostemofoline indicated that the known Stemona alkaloid stemoburkilline is the Z-isomer and not the E-isomer as initially reported. The semisynthesis involved conversion of (11Z)-1',2' -didehydrostemofoline to II(S), 12(S)-dihydrostemofoline followed by a stereoselective base-catalyzed ring-opening reaction to give (Z)-stemoburkilline. The same product was obtained using a similar synthetic protocol stariing from isostemofoline via a based-catalyzed ring-opening reaction of II (S), 12(R)-dihydrostemofoline. A re-examination of the crude root extracts of Stemona burkillii Prain and further NOE studies established stemoburkilline as the Z-isomer.


Alkaloids From The Roots Of Stemona Aphylla, Pitchaya Mungkornasawakul, Sukanda Chaiyong, Thanapat Sastraruji, Araya Jatisatienr, Chaiwat Jatisatienr, Stephen G. Pyne, Alison T. Ung, Jurgen Korth, Wilford Lie Jan 2009

Alkaloids From The Roots Of Stemona Aphylla, Pitchaya Mungkornasawakul, Sukanda Chaiyong, Thanapat Sastraruji, Araya Jatisatienr, Chaiwat Jatisatienr, Stephen G. Pyne, Alison T. Ung, Jurgen Korth, Wilford Lie

Faculty of Science - Papers (Archive)

Three known compounds, stemofoline, (2'S)-hydroxystemofoline, and (11Z)-1 ',2'-didehydrostemofoline, along with two new alkaloids, stemaphylline and stemaphylline-N-oxide, have been isolated from a root extract of Stemona aphylla. The structures of these alkaloids were determined on the basis of their spectroscopic data. The analysis of the crude dichloromethane extract by GC-MS in the ElMS mode showed the presence of alkaloids 1-4, the alkaloid 11, and stilbostemin R. The crude dichloromethane extract and 4 were tested for their comparative biological activities. The results of their acetylcholinesterase (AChE) inhibitory activities showed that the crude extract had higher activity than that ...


Stemofoline Ethyl Acetate Solvate, Pitchaya Mungkornasawakul, Stephen G. Pyne, Alison T. Ung, Araya Jatisatienr, Anthony C. Willis Jan 2009

Stemofoline Ethyl Acetate Solvate, Pitchaya Mungkornasawakul, Stephen G. Pyne, Alison T. Ung, Araya Jatisatienr, Anthony C. Willis

Faculty of Science - Papers (Archive)

Crystals of the title compound, C2zH29NOs,C4HsOz, ([ systematic name: (2R,3R,5R,5aS,6R,8aR,9S)-(5Z)-5-[3-butyltetrah ydro-6-me thyl- 2,5-me thano-4,3 ,8a -[1] propan yl[3]ylidenefuro[ 3,2-j] [1,4]oxazepin-7( 5H)-ylidene ]-4-methoxy-3- methylfuran-2(5H)-one ethyl acetate solvate) were isolated from the root extracts of Stemona aphylla (Stemonaceae). The structure closely resembles those of stemofoline derivatives which have previously been reported. Intermolecular contacts are observed between some C-bonded H atoms and nearby 0 atoms, perhaps indicating weak interactions which could influence the packing of species within the unit cell.


Absolute Calibration Of The Intramolecular Site Preference Of 15n Fractionation In Tropospheric N2o By Ft-Ir Spectroscopy, David W. T Griffith, Stephen D. Parkes, Vanessa Haverd, Clare Paton-Walsh, Stephen R. Wilson Jan 2009

Absolute Calibration Of The Intramolecular Site Preference Of 15n Fractionation In Tropospheric N2o By Ft-Ir Spectroscopy, David W. T Griffith, Stephen D. Parkes, Vanessa Haverd, Clare Paton-Walsh, Stephen R. Wilson

Faculty of Science - Papers (Archive)

Nitrous oxide (N2O) plays important roles in atmospheric chemistry both as a greenhouse gas and in stratospheric ozone depletion. Isotopic measurements of N2O have provided an invaluable insight into understanding its atmospheric sources and sinks. The preference for 15N fractionation between the central and terminal positions (the “site preference”) is particularly valuable because it depends principally on the processes involved in N2O production or consumption, rather than the 15N content of the substrate from which it is formed. Despite the value of measurements of the site preference, there is no internationally recognized standard reference material of accurately known and accepted ...


The Cd-Loop Of Pai-2 (Serpinb2) Is Redundant In The Targeting, Inhibition And Clearance Of Cell Surface Upa Activity, Blake J. Cochran, Lakshitha P. Gunawardhana, Kara L. Perrow, Jodi A. Lee, Sergei A. Lobov, Marie Ranson Jan 2009

The Cd-Loop Of Pai-2 (Serpinb2) Is Redundant In The Targeting, Inhibition And Clearance Of Cell Surface Upa Activity, Blake J. Cochran, Lakshitha P. Gunawardhana, Kara L. Perrow, Jodi A. Lee, Sergei A. Lobov, Marie Ranson

Faculty of Science - Papers (Archive)

Background: Plasminogen activator inhibitor type-2 (PAI-2, SERPINB2) is an irreversible, specific inhibitor of the urokinase plasminogen activator (uPA). Since overexpression of uPA at the surface of cancer cells is linked to malignancy, targeting of uPA by exogenous recombinant PAI-2 has been proposed as the basis of potential cancer therapies. To this end, reproducible yields of high purity protein that maintains this targeting ability is required. Herein we validate the use in vitro of recombinant 6 × His-tagged-PAI-2 lacking the intrahelical loop between C and D alpha-helices (PAI- 2 ΔCD-loop) for these purposes.

Results: We show that PAI-2 ΔCD-loop expressed and purified ...


Place And Music: Performing "The Region" On The New South Wales Far North Coast, Christopher R. Gibson Jan 2009

Place And Music: Performing "The Region" On The New South Wales Far North Coast, Christopher R. Gibson

Faculty of Science - Papers (Archive)

This paper draws on research conducted for over a decade on the musical cultures of the New South Wales Far North Coast, as a contribution to debates in geography and popular music studies on the links between music, place and articulations of cultural identities. Patterns of migration and economic restructuring over the last 20 years have transformed the Far North Coast region, with associated changes in the images conjured to describe the region – from those centred on dairying, fishing and sugar harvesting to those of a ‘lifestyle’ or ‘alternative’ region, with growth in employment in tourism, recreational services, ‘gourmet’ agricultural ...


Stable Isotope Metabolic Labeling With A Novel 15n-Enriched Bacteria Diet For Improved Proteomic Analyses Of Mouse Models For Psychopathologies, Yinglong Zhang, Elisabeth T. Frank, B. Hambsch, C. W. Turck, M. Bunck, R. Landgraf, M. S. Kessler, G. Maccarrone, M. Filiou, Hermann Heumann, Stefan Reckow Jan 2009

Stable Isotope Metabolic Labeling With A Novel 15n-Enriched Bacteria Diet For Improved Proteomic Analyses Of Mouse Models For Psychopathologies, Yinglong Zhang, Elisabeth T. Frank, B. Hambsch, C. W. Turck, M. Bunck, R. Landgraf, M. S. Kessler, G. Maccarrone, M. Filiou, Hermann Heumann, Stefan Reckow

Faculty of Science - Papers (Archive)

The identification of differentially regulated proteins in animal models of psychiatric diseases is essential for a comprehensive analysis of associated psychopathological processes. Mass spectrometry is the most relevant method for analyzing differences in protein expression of tissue and body fluid proteomes. However, standardization of sample handling and sample-to-sample variability are problematic. Stable isotope metabolic labeling of a proteome represents the gold standard for quantitative mass spectrometry analysis. The simultaneous processing of a mixture of labeled and unlabeled samples allows a sensitive and accurate comparative analysis between the respective proteomes. Here, we describe a cost-effective feeding protocol based on a newly ...


Darriwilian (Middle Ordovician) Conodonts From Thompson Creek, Nelson Province, New Zealand, Yong Yi Zhen, Ian G. Percival, Roger A. Cooper, John E. Simes, Anthony J. Wright Jan 2009

Darriwilian (Middle Ordovician) Conodonts From Thompson Creek, Nelson Province, New Zealand, Yong Yi Zhen, Ian G. Percival, Roger A. Cooper, John E. Simes, Anthony J. Wright

Faculty of Science - Papers (Archive)

A well preserved Middle Ordovician conodont fauna of 24 species has been recovered from seven samples of a small limestone lens exposed in Thompson Creek, northwest of Nelson, on the South Island of New Zealand. The presence of Histiodella holodentata, Baltoniodus? sp., Paroistodus originalis, P. horridus, Periodon macrodentatus, Protopanderodus sp. cf. P. varicostatus, Costiconus ethingtoni and Venoistodus balticus in the fauna indicates a Darriwilian (late Da2 to mid Da3) age. The occurrence of Ansella jemtlandica, Baltoniodus? sp., Periodon macrodentatus, Spinodus sp., Spinodus? sp. and Histiodella holodentata suggests a relatively deeper water (outer shelf to slope) setting, comparable with contemporaneous faunas ...


Aboriginal Settlement During The Lgm At Brockman, Pilbara Region, Western Australia, Michael Slack, Melanie Fillios, Richard L. Fullagar Jan 2009

Aboriginal Settlement During The Lgm At Brockman, Pilbara Region, Western Australia, Michael Slack, Melanie Fillios, Richard L. Fullagar

Faculty of Science - Papers (Archive)

This paper describes the results and implications of recent excavations on the Hamersley Iron Brockman 4 tenement, near Torn Price, Western Australia. Results concentrate on two rock shelters with Aboriginal occupation starting at least 32,000 years ago and extending throughout the Last Glacial period. Preliminary observations are proposed concerning the nature of Aboriginal foraging patterns as displayed in the flaked stone and faunal records for the Brockman region.


Desiccation Protects Antarctic Mosses From Ultraviolet-B Induced Dna Damage, Johanna Turnbull, Sharon A. Robinson, Simon J. Leslie Jan 2009

Desiccation Protects Antarctic Mosses From Ultraviolet-B Induced Dna Damage, Johanna Turnbull, Sharon A. Robinson, Simon J. Leslie

Faculty of Science - Papers (Archive)

Antarctic mosses live in a frozen desert, and are characterised by the ability to survive desiccation. They can tolerate multiple desiccation-rehydration events over the summer growing season. As a result of recent ozone depletion, such mosses may also be exposed to ultraviolet-B radiation while desiccated. The ultraviolet-B susceptibility of Antarctic moss species was examined in a laboratory experiment that tested whether desiccated or hydrated mosses accumulated more DNA damage under enhanced ultraviolet-B radiation. Accumulation of cyclobutane pyrimidine dimers and pyrimidine (64) pyrimidone dimers was measured in moss samples collected from the field and then exposed to ultraviolet-B radiation in either ...


Middle Ordovician (Darriwilian) Brachiopods And Trilobites From Thompson Creek, Northwest Nelson, New Zealand, Ian G. Percival, Anthony J. Wright, Roger A. Cooper, John E. Simes, Yong Yi Zhen Jan 2009

Middle Ordovician (Darriwilian) Brachiopods And Trilobites From Thompson Creek, Northwest Nelson, New Zealand, Ian G. Percival, Anthony J. Wright, Roger A. Cooper, John E. Simes, Yong Yi Zhen

Faculty of Science - Papers (Archive)

A well preserved Middle Ordovician shelly fauna, represented by twelve species of lingulate brachiopods and one trilobite genus, was recovered from an allochthonous limestone lens exposed in Thompson Creek, northwest of Nelson, on the South Island of New Zealand. The stratigraphic setting is unclear as the limestone is situated in the Takaka Terrane adjacent to the Anatoki Fault, separating this terrane from the Buller Terrane. The original depositional environment of the limestone is interpreted as relatively deep water (outer shelf to upper slope). Lingulate brachiopods described include the new species Hyperobolus? thompsonensis sp. nov., Cyrtonotreta robusta sp. nov., Scaphelasma paturauensis ...


Molecular And Morphological Description Of A Hepatozoon Species In Reptiles And Their Ticks In The Northern Territory, Australia, Inger-Marie E. Vilcins, Beata Ujvari, Julie M. Old, Elizabeth Deane Jan 2009

Molecular And Morphological Description Of A Hepatozoon Species In Reptiles And Their Ticks In The Northern Territory, Australia, Inger-Marie E. Vilcins, Beata Ujvari, Julie M. Old, Elizabeth Deane

Faculty of Science - Papers (Archive)

Ticks, representing 3 species of Amblyomma, were collected from the water python (Liasis fuscus) and 3 additional reptile species in the Northern Territory, Australia, and tested for the presence of Hepatozoon sp., the most common blood parasites of snakes. In addition, blood smears were collected from 5 reptiles, including the water python, and examined for the presence of the parasite. Hepatozoon sp. DNA was detected in all tick and reptile species, with 57.7% of tick samples (n = 187) and 35.6% of blood smears (n = 35) showing evidence of infection. Phylogenetic analysis of the 18S rRNA gene demonstrated that ...


Establishment And Persistence Of Species-Rich Patches In A Species-Poor Landscape: Role Of A Structure-Forming Subtidal Barnacle, A. R. Davis, David. W. Ward Jan 2009

Establishment And Persistence Of Species-Rich Patches In A Species-Poor Landscape: Role Of A Structure-Forming Subtidal Barnacle, A. R. Davis, David. W. Ward

Faculty of Science - Papers (Archive)

Some sessile invertebrates are capable of maintaining space in barren habitats produced by sea urchins, thereby creating species-rich patches in a species-poor landscape. We sought to determine the role of a large and common barnacle, Austrobalanus imperator, in the establishment and persistence of these species-rich patches. Barnacle density was modified in 2 experiments at sites in southeastern Australia. The first experiment concerned community establishment and involved the addition of barnacles in 4 densities (zero [control], low, medium and high) to plots on vertical rock surfaces. The addition of barnacles at ecologically realistic densities and spatial arrangements rapidly resulted in statistically ...


A Novel Zinc-Binding Fold In The Helicase Interaction Domain Of The Bacillus Subtilis Dnal Helicase Loader, Karin V. Loscha, Kristaps Jaudzems, Charikleia Ioannou, Xun-Cheng Su, Flynn R. Hill, Gottfried Otting, Nicholas E. Dixon, Edvards Liepinsh Jan 2009

A Novel Zinc-Binding Fold In The Helicase Interaction Domain Of The Bacillus Subtilis Dnal Helicase Loader, Karin V. Loscha, Kristaps Jaudzems, Charikleia Ioannou, Xun-Cheng Su, Flynn R. Hill, Gottfried Otting, Nicholas E. Dixon, Edvards Liepinsh

Faculty of Science - Papers (Archive)

The helicase loader protein DnaI (the Bacillus subtilis homologue of Escherichia coli DnaC) is required to load the hexameric helicase DnaC (the B. subtilis homologue of E. coli DnaB) onto DNA at the start of replication. While the C-terminal domain of DnaI belongs to the structurally well-characterized AAA+ family of ATPases, the structure of the N-terminal domain, DnaI-N, has no homology to a known structure. Three-dimensional structure determination by nuclear magnetic resonance (NMR) spectroscopy shows that DnaI presents a novel fold containing a structurally important zinc ion. Surface plasmon resonance experiments indicate that DnaI-N is largely responsible for binding of ...


Predicting Avian Distributions To Evaluate Spatiotemporal Overlap With Locust Control Operations In Eastern Australia, Judit K. Szabo, Pamela J. Davy, Michael Hooper, Lee Astheimer Jan 2009

Predicting Avian Distributions To Evaluate Spatiotemporal Overlap With Locust Control Operations In Eastern Australia, Judit K. Szabo, Pamela J. Davy, Michael Hooper, Lee Astheimer

Faculty of Science - Papers (Archive)

Locusts and grasshoppers cause considerable economic damage to agriculture worldwide. The Australian Plague Locust Commission uses multiple pesticides to control locusts in eastern Australia. Avian exposure to agricultural pesticides is of conservation concern, especially in the case of rare and threatened species. The aim of this study was to evaluate the probability of pesticide exposure of native avian species during operational locust control based on knowledge of species occurrence in areas and times of application. Using presence-absence data provided by the Birds Australia Atlas for 1998 to 2002, we developed a series of generalized linear models to predict avian occurrences ...


Real-Time Single-Molecule Observation Of Rolling-Circle Dna Replication, Nathan A. Tanner, Joseph J. Loparo, Samir M. Hamdan, Slobodan Jergic, Nicholas E. Dixon, Antoine M. Van Oijen Jan 2009

Real-Time Single-Molecule Observation Of Rolling-Circle Dna Replication, Nathan A. Tanner, Joseph J. Loparo, Samir M. Hamdan, Slobodan Jergic, Nicholas E. Dixon, Antoine M. Van Oijen

Faculty of Science - Papers (Archive)

We present a simple technique for visualizing replication of individual DNA molecules in real time. By attaching a rolling-circle substrate to a TIRF microscope-mounted flow chamber, we are able to monitor the progression of single-DNA synthesis events and accurately measure rates and processivities of single T7 and Escherichia coli replisomes as they replicate DNA. This method allows for rapid and precise characterization of the kinetics of DNA synthesis and the effects of replication inhibitors.


Consistent Paternity Skew Through Ontogeny In Peron's Tree Frog (Litoria Peronii), Craig D. Sherman, Erik Wapstra, Mats M. Olsson Jan 2009

Consistent Paternity Skew Through Ontogeny In Peron's Tree Frog (Litoria Peronii), Craig D. Sherman, Erik Wapstra, Mats M. Olsson

Faculty of Science - Papers (Archive)

Background: A large number of studies in postcopulatory sexual selection use paternity success as a proxy for fertilization success. However, selective mortality during embryonic development can lead to skews in paternity in situations of polyandry and sperm competition. Thus, when assessment of paternity fails to incorporate mortality skews during early ontogeny, this may interfere with correct interpretation of results and subsequent evolutionary inference. In a previous series of in vitro sperm competition experiments with amphibians (Litoria peronii), we showed skewed paternity patterns towards males more genetically similar to the female.

Methodology/Principal Findings: Here we use in vitro fertilizations and ...


The Tràng An Project: Late-To-Post Pleistocene Settlement Of The Lower Song Hong Valley, North Vietnam, Ryan Rabett, G Barker, C O. Hunt, C O. Hunt, P Piper, E Raddatz, T Reynolds, Nguyen Van Son, C Stimpson, Katherine A. Szabo, Nguyen Cao Tan, J Wilson Jan 2009

The Tràng An Project: Late-To-Post Pleistocene Settlement Of The Lower Song Hong Valley, North Vietnam, Ryan Rabett, G Barker, C O. Hunt, C O. Hunt, P Piper, E Raddatz, T Reynolds, Nguyen Van Son, C Stimpson, Katherine A. Szabo, Nguyen Cao Tan, J Wilson

Faculty of Science - Papers (Archive)

Tràng An is a Vietnamese government supported cultural and ecological park development covering 2,500 hectares that is centred on an isolated massif on the southern edge of the Song Hong delta in Ninh Bình Province, north Vietnam (Fig. 1). The archaeological investigation of Tràng An is being led jointly by the Xuan Truong Construction Corporation and the McDonald Institute for Archaeological Research, University of Cambridge, under the direction of the lead author. The Corporation is creating an ecologically sensitive development – the ‘Tràng An Tourism Resort’ – within this karstic landscape, which is also the subject of a planned application to ...


Differences In Soft-Sediment Macrobenthic Assemblages Invaded By Caulerpa Taxifolia Compared To Uninvaded Habitats, Justin G. Mckinnon, Paul E. Gribben, Andrew R. Davis, Dianne F. Jolley, Jeffrey T. Wright Jan 2009

Differences In Soft-Sediment Macrobenthic Assemblages Invaded By Caulerpa Taxifolia Compared To Uninvaded Habitats, Justin G. Mckinnon, Paul E. Gribben, Andrew R. Davis, Dianne F. Jolley, Jeffrey T. Wright

Faculty of Science - Papers (Archive)

Caulerpa taxifolia is a habitat-forming green alga that has invaded several temperate regions worldwide. Although C. taxifolia covers large areas of soft-sediment habitat, little is known about its effects on soft-sediment invertebrate assemblages. We compared soft-sediment macroinvertebrate assemblages in 2 estuaries in southeastern Australia invaded by C. taxifolia to examine 2 main predictions: (1) areas covered with C. taxifolia will have different assemblages compared to unvegetated sediment because infauna are inhibited but epifauna are facilitated, and (2) areas with C. taxifolia will have different assemblages compared to those with native seagrasses (Halophila ovalis and Zostera capricorni) because infauna are inhibited ...


Electrocatalytic Reduction Of Carbon Dioxide By Cobalt-Phthalocyanine-Incorporated Polypyrrole, Jun Chen, Gordon G. Wallace, Jiaxing Lu, Aijian Zhang, Weimin Zhang Jan 2009

Electrocatalytic Reduction Of Carbon Dioxide By Cobalt-Phthalocyanine-Incorporated Polypyrrole, Jun Chen, Gordon G. Wallace, Jiaxing Lu, Aijian Zhang, Weimin Zhang

Faculty of Science - Papers (Archive)

In the quest for catalysts for the electrocatalytic reduction of , a cobalt phthalocyanine/polypyrrole (CoPc/PPy) composite electrode has been developed. The electrode is prepared by drop casting CoPc onto the PPy film from the CoPc/tetrahydrofuran solution (1 mg/mL). The onset potential for reduction occurred at potentials 160 mV more positive than observed with a simple PPy electrode. Furthermore, in the potentiostatic electrolysis, the catalytic current for reduction at CoPc/PPy was very stable, with a higher current density and current efficiency when compared to the PPy electrode.


Late Llandovery (Early Silurian) Dendroid Graptolites From The Cotton Formation Near Forbes, New South Wales, R B. Rickards, Anthony J. Wright, G Thomas Jan 2009

Late Llandovery (Early Silurian) Dendroid Graptolites From The Cotton Formation Near Forbes, New South Wales, R B. Rickards, Anthony J. Wright, G Thomas

Faculty of Science - Papers (Archive)

A well-preserved dendroid graptolite fauna of Early Silurian (late Llandovery: probable turriculatus graptolite zone) age is described from the Cotton Formation near Forbes, New South Wales. A possible rhabdopleuran hemichordate is described from Australia for the fi rst time. The fauna consists of 13 taxa as follows: Dendrograptus sp. aff. D. avonleaensis, Dictyonema zalasiewiczi sp. nov., Dictyonema sp. aff. D. paululum australis, Dictyonema paululum australis, Dictyonema sp. aff. D. sp. cf. D. venustus of Bulman (?ssp. nov.), Dictyonema venustum, Dictyonema sp. cf. D. falciferum, Callograptus bridgecreekensis, Callograptus rigbyae, Callograptus sp. aff. C. ulahensis, Stelechocladia sp. cf. S. praeattenuata, Acanthograptus praedeckeri ...