Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- CMMB (49)
- GeoQUEST (31)
- Australia (13)
- Carbon (10)
- Amyloid (7)
-
- Measurements (7)
- Australian (6)
- Detection (5)
- Effects (5)
- Formation (5)
- Late (5)
- Materials (5)
- Nanotube (5)
- Quaternary (5)
- Solar (5)
- Studies (5)
- Study (5)
- Total (5)
- 1 (4)
- Age (4)
- Associated (4)
- Cells (4)
- Change (4)
- Climate (4)
- Column (4)
- Conducting (4)
- Crystallin (4)
- Distribution (4)
- Evidence (4)
- Fibril (4)
Articles 181 - 191 of 191
Full-Text Articles in Physical Sciences and Mathematics
Activity And Dynamics Of An Enzyme, Pig Liver Esterase, In Near-Anhydrous Conditions, Murielle Lopez, Vandana Kurkal-Siebert, Rachel V. Dunn, Moeava Tehei, John L. Finney, Jeremy C. Smith, Roy M. Daniel
Activity And Dynamics Of An Enzyme, Pig Liver Esterase, In Near-Anhydrous Conditions, Murielle Lopez, Vandana Kurkal-Siebert, Rachel V. Dunn, Moeava Tehei, John L. Finney, Jeremy C. Smith, Roy M. Daniel
Faculty of Science - Papers (Archive)
Water is widely assumed to be essential for life, although the exact molecular basis of this requirement is unclear. Water facilitates protein motions, and although enzyme activity has been demonstrated at low hydrations in organic solvents, such nonaqueous solvents may allow the necessary motions for catalysis. To examine enzyme function in the absence of solvation and bypass diffusional constraints we have tested the ability of an enzyme, pig liver esterase, to catalyze alcoholysis as an anhydrous powder, in a reaction system of defined water content and where the substrates and products are gaseous. At hydrations of 3 (52) molecules of …
Trace Gas Emissions From Savanna Fires In Northern Australia, Clare Paton-Walsh, Nicholas M. Deutscher, David Griffith, B. W. Forgan, Stephen Wilson, Nicholas Jones, D. Edwards
Trace Gas Emissions From Savanna Fires In Northern Australia, Clare Paton-Walsh, Nicholas M. Deutscher, David Griffith, B. W. Forgan, Stephen Wilson, Nicholas Jones, D. Edwards
Faculty of Science - Papers (Archive)
We present analyses of near‐infrared ground‐based Fourier transform infrared solar absorption spectra recorded from a site in Darwin, Northern Territory, Australia (12.4°S, 130.9°E) from August 2005 to June 2008. Total column amounts of carbon monoxide derived from these spectra show a very clear annual cycle, with evidence of transported pollution from Indonesian fires in 2006. Aerosol optical depth measurements from the same site show a similar annual cycle but without exceptional values in 2006, suggesting significant loss of aerosol loading in the transported and aged smoke. In addition, we report the first ever measurements by remote sensing solar Fourier transform …
The Quaternary Organization And Dynamics Of The Molecular Chaperone Hsp26 Are Thermally Regulated, J. L. Benesch, Andrew Aquilina, Andrew Baldwin, Agata Rekas, Florian Stengel, Robyn Lindner, Eman Basha, G. Devlin, J. Horwitz, Elizabeth Vierling, John Carver, C. V. Robinson
The Quaternary Organization And Dynamics Of The Molecular Chaperone Hsp26 Are Thermally Regulated, J. L. Benesch, Andrew Aquilina, Andrew Baldwin, Agata Rekas, Florian Stengel, Robyn Lindner, Eman Basha, G. Devlin, J. Horwitz, Elizabeth Vierling, John Carver, C. V. Robinson
Faculty of Science - Papers (Archive)
The function of ScHSP26 is thermally controlled: the heat shock that causes the destabilization of target proteins leads to its activation as a molecular chaperone. We investigate the structural and dynamical properties of ScHSP26 oligomers through a combination of multiangle light scattering, fluorescence spectroscopy, NMR spectroscopy, and mass spectrometry. We show that ScHSP26 exists as a heterogeneous oligomeric ensemble at room temperature. At heat-shock temperatures, two shifts in equilibria are observed: toward dissociation and to larger oligomers. We examine the quaternary dynamics of these oligomers by investigating the rate of exchange of subunits between them and find that this not …
Measures Of Taxonomic Distinctness Do Not Reliably Assess Anthropogenic Impacts On Intertidal Mollusc Communities, Trudy Costa, Timothy O'Hara, Michael Keough
Measures Of Taxonomic Distinctness Do Not Reliably Assess Anthropogenic Impacts On Intertidal Mollusc Communities, Trudy Costa, Timothy O'Hara, Michael Keough
Faculty of Science - Papers (Archive)
Indices of taxonomic distinctness measure the taxonomic breadth of a community and may be more sensitive to human impacts than conventional diversity indices. They have the advantage of being, in theory, insensitive to sampling effort and can be calculated using presence/absence data. The average taxonomic distinctness index and variation in taxonomic distinctness index were used to assess the effects of putative human impacts on molluscan community composition at 63 rocky intertidal platforms on the coast of Victoria, Australia. The use of 2 sampling techniques, viz. timed searches and quadrats, was compared. Sites exposed to sewage discharge maintained high taxonomic distinctness, …
Side By Side Measurements Of Co2 By Ground-Based Fourier Transform Spectrometry (Fts), Janina Messerschmidt, Ronald Macatangay, Justus Notholt, Christof Petri, Thorsten Warneke, Christine Weinzierl
Side By Side Measurements Of Co2 By Ground-Based Fourier Transform Spectrometry (Fts), Janina Messerschmidt, Ronald Macatangay, Justus Notholt, Christof Petri, Thorsten Warneke, Christine Weinzierl
Faculty of Science - Papers (Archive)
High resolution solar absorption Fourier transform spectrometry (FTS) is the most precise ground-based remote sensing technique to measure the total column of atmospheric carbon dioxide. For carbon cycle studies as well as for the calibration and validation of spaceborne sensors the instrumental comparability of FTS systems is of critical importance. Retrievals from colocated measurements by two identically constructed FTS systems have been compared for the first time. Under clear sky conditions a precision for the retrieved xCO2 better than ∼0.1% is demonstrated and the instruments agree within ∼0.07%. An important factor in achieving such good comparability of the xCO2 is …
Distribution Of Thermogenic Activity In Floral Tissues Of Nelumbo Nucifera, Nicole M. Grant, Rebecca E. Miller, Jennifer Watling, Sharon A. Robinson
Distribution Of Thermogenic Activity In Floral Tissues Of Nelumbo Nucifera, Nicole M. Grant, Rebecca E. Miller, Jennifer Watling, Sharon A. Robinson
Faculty of Science - Papers (Archive)
Thermogenesis in Nelumbo nucifera (Gaertn.) has been known to scientists for many years; however, the extent of heating by different floral parts remains unclear. We present evidence that the receptacle, stamens and petals produce heat independently, and that the source of heating in these tissues is most likely the alternative oxidase (AOX). The temperatures of the receptacle, petals and stamens were significantly higher than non-thermogenic leaf tissue. After removal from the pedicel, the receptacle retained the most heat (8.1 ± 1.9°C above non-thermogenic tissue temperature) and the petals the least (2.8 ± 4.2°C), with the stamens intermediate. High AOX protein …
Suitability Of Membrane Bioreactor For Treatment Of Recalcitrant Textile Dye Wastewater Utilising White-Rot Fungi, Faisal I. Hai, Kazuo Yamamoto
Suitability Of Membrane Bioreactor For Treatment Of Recalcitrant Textile Dye Wastewater Utilising White-Rot Fungi, Faisal I. Hai, Kazuo Yamamoto
Faculty of Science - Papers (Archive)
The performance of a laboratory scale membrane bioreactor (MBR) — utilizing a mixed microbial community dominated by fungi— for treatment of textile dye wastewater was investigated. A synthetic wastewater containing dye, starch (main contributor to total organic carbon, TOC) and other nutrients was used. Preliminary batch tests confirmed the superior decoloration capacity of pure fungus culture (Coriolus versicolor, NBRC 9791) as compared to that of conventional activated sludge. Simultaneous biosorption and biodegradation was evident in case of the fungus, while mainly biosorption was responsible for decoloration by activated sludge. On the other hand, activated sludge demonstrated comparatively faster TOC removal. …
Naturalism, Nature And Questions Of Style In Jinsha River Rock Art, Northwest Yunnan, China, Paul S. C. Tacon, Li Gang, Yang Decong, Sally K. May, Liu Hong, Maxime Aubert, Ji Xueping, Darren Curnoe, Andy I. R. Herries
Naturalism, Nature And Questions Of Style In Jinsha River Rock Art, Northwest Yunnan, China, Paul S. C. Tacon, Li Gang, Yang Decong, Sally K. May, Liu Hong, Maxime Aubert, Ji Xueping, Darren Curnoe, Andy I. R. Herries
Faculty of Science - Papers (Archive)
The naturalistic rock art of Yunnan Province is poorly known outside of China despite two decades of investigation by local researchers. The authors report on the first major international study of this art, its place in antiquity and its resemblance to some of the rock art of Europe, southern Africa and elsewhere. While not arguing a direct connection between China, Europe and other widely separated places, this article suggests that rock-art studies about the nature of style, culture contact and the transmission of iconography across space and time need to take better account of the results of neuroscience research, similar …
Scale Dependence Of Lithological Control On Topography: Bedrock Channel Geometry And Catchment Morphometry In Western Scotland, John D. Jansen, Alexandru T. Codilean, Paul Bishop, Trevor B. Hoey
Scale Dependence Of Lithological Control On Topography: Bedrock Channel Geometry And Catchment Morphometry In Western Scotland, John D. Jansen, Alexandru T. Codilean, Paul Bishop, Trevor B. Hoey
Faculty of Science - Papers (Archive)
We propose that a scale-dependent topographic signature of erodibility arises due to fiuvial and glacial erosion acting on different parts of the landscape at different times. For 14 catchments in western Scotland, we define three levels of substrate erodibility in order of decreasing resistance: quartzite rocks, nonquartzite rocks, and zones of fault-related fracture. Then, using digital topographic and planimetric data coupled with field measurements, we identify regression-based scaling relationships between substrate erodibility and morphometric parameters at two spatial scales. Catchment-scale morphometry shows a weak to variable relationship with substrate metrics overall. Erodibility can be inferred from catchment steepness indices (i.e., …
Feeding Biology Of Two Functionally Different Foregut-Fermenting Mammals, The Marsupial Red Kangaroo And The Ruminant Sheep: How Physiological Ecology Can Inform Land Management, Adam Munn, T J. Dawson, S R. Mcleod
Feeding Biology Of Two Functionally Different Foregut-Fermenting Mammals, The Marsupial Red Kangaroo And The Ruminant Sheep: How Physiological Ecology Can Inform Land Management, Adam Munn, T J. Dawson, S R. Mcleod
Faculty of Science - Papers (Archive)
Fermentative digestion in an expanded foregut region has evolved independently among Australia's marsupial kangaroos as well as among placental ruminants. However, notable differences occur in the form and function of the kangaroo and ruminant forestomachs, the main site of fermentation; kangaroos possess a tubiform forestomach, reminiscent of the horse colon, whereas ruminants possess a large vat-like structure. How these differences in gut form might influence kangaroo and sheep ecologies is uncertain. We compared diet choice, apparent digestibility (dry matter), food intake and grazing behaviour of Australia's largest kangaroo, the red kangaroo Macropus rufus and the ruminant sheep Ovis aries. Digestive …
Charge Transport In Dye-Sensitized Solar Cells Based On Flame-Made Tio2 Nanoparticles, George Tsekouras, Masanori Miyashita, Yung Kent Kho, Wey Yang Teoh, Attila J. Mozer, Rose Amal, Shogo Mori, Gordon G. Wallace
Charge Transport In Dye-Sensitized Solar Cells Based On Flame-Made Tio2 Nanoparticles, George Tsekouras, Masanori Miyashita, Yung Kent Kho, Wey Yang Teoh, Attila J. Mozer, Rose Amal, Shogo Mori, Gordon G. Wallace
Faculty of Science - Papers (Archive)
The fundamental understanding on charge-transport properties of flame-synthesized TiO2 in dye-sensitized solar cells (DSSCs) is established in this work. By employing a one-step flame spray pyrolysis (FSP), predominantly anatase TiO2 nanoparticles with average nanoparticle sizes between 11 and 36 nm were achieved by varying the rate of combustion enthalpy (through varying liquid precursor feed flow rates) and using either an “openflame” or “enclosed-flame” configuration. Electron diffusion coefficient (D), electron lifetime (τ ), open circuit voltage (Voc ), and capacitance (C) measurements carried out on FSP TiO2 -based DSSCs demonstrated that interband charge trap density decreased with increase in particle size. …