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Full-Text Articles in Life Sciences
Accordion Vs. Quantum Tectonics: Insights Into Continental Growth Processes From The Paleozoic Of Eastern Gondwanan, Jonathan C. Aitchison, Solomon Buckman
Accordion Vs. Quantum Tectonics: Insights Into Continental Growth Processes From The Paleozoic Of Eastern Gondwanan, Jonathan C. Aitchison, Solomon Buckman
Faculty of Science - Papers (Archive)
The Early Paleozoic Lachlan Fold Belt of eastern Australia is widely regarded as an ancient convergent plate margin beneath which paleo-Pacific (Panthalassic) oceanic lithosphere was continuously subducted. It is cited as the type example of a retreating accretionary orogeny. However, sandstone compositions, the sedimentological nature and timing of chert accumulation and overall stratigraphic architecture are not necessarily consistent with this model. We suggest an alternative explanation for growth of Gondwanan continental margin. Oceanic lithosphere outboard of the passive Gondwana continental margin was subducted beneath an extensive intra-oceanic island arc that now crops out as an allochthonous element (Macquarie arc) within …
Novel Technique Shows Different Hydrophobic Chemical Signatures Of Exotic And Indigenous Plant Soils With Similar Effects Of Extracts On Indigenous Species Seedling Growth, Emilie-Jane Ens, Kristine O. French, John B. Bremner, Jurgen Korth
Novel Technique Shows Different Hydrophobic Chemical Signatures Of Exotic And Indigenous Plant Soils With Similar Effects Of Extracts On Indigenous Species Seedling Growth, Emilie-Jane Ens, Kristine O. French, John B. Bremner, Jurgen Korth
Faculty of Science - Papers (Archive)
Changes to ecosystem abiotic parameters are regarded as possible mechanisms facilitating plant invasion and community composition shifts. This study compared the hydrophobic chemical signatures of soil from exotic bitou bush (Chrysanthemoides monilifera spp. rotundata) invaded, indigenous acacia (Acacia longifolia var. sophorae) dominated and bare sand (unvegetated) habitats using a novel, rapid, capturing technique which utilised AmberliteA (R) XAD4 resin filled bags that were placed in situ. The hydrophobic chemical signature of the bitou bush soil extract was significantly different to the acacia soil and bare sand extracts. High concentrations of 18 sesquiterpenes dominated the hydrophobic signature of the bitou bush …
The Hydraulic Geometry Of Narrow And Deep Channels; Evidence For Flow Optimisation And Controlled Peatland Growth, Rachel Nanson, Gerald C. Nanson, He Qing Huang
The Hydraulic Geometry Of Narrow And Deep Channels; Evidence For Flow Optimisation And Controlled Peatland Growth, Rachel Nanson, Gerald C. Nanson, He Qing Huang
Faculty of Science - Papers (Archive)
At-a-station and bankfull hydraulic geometry analyses of peatland channels at Barrington Tops, New South Wales, Australia, reveal adjustments in self-forming channels in the absence of sediment load. Using Rhodes ternary diagram, comparisons are made with hydraulic geometry data from self-forming channels carrying bedload in alluvial settings elsewhere. Despite constraints on channel depths caused at some locations by the restricted thickness of peat, most stations have cohesive, near-vertical, well-vegetated banks, and width/depth (w/d) ratios of similar to 2 that are optimal for sediment-free flow. Because banks are strong, resist erosion and can stand nearly vertical, and depth is sometimes constrained, adjustments …
In Situ Growth Of Sno2 On Graphene Nanosheets As Advanced Anode Materials For Rechargeable Lithium Batteries, Xiaowei Yang, Yu-Shi He, Xiao-Zhen Liao, Jun Chen, Gordon G. Wallace, Zi-Feng Ma
In Situ Growth Of Sno2 On Graphene Nanosheets As Advanced Anode Materials For Rechargeable Lithium Batteries, Xiaowei Yang, Yu-Shi He, Xiao-Zhen Liao, Jun Chen, Gordon G. Wallace, Zi-Feng Ma
Faculty of Science - Papers (Archive)
Graphene with a single layer of carbon atoms densely packed in a honeycomb crystal lattice is one of attractive materials for the intercalation of lithium ion, but it has low volumetric capacity owing to low tap density. We report a method for in situ growth of SnO2 on graphene nanosheets (SGN) as anode materials for rechargeable lithium batteries. The results indicated that the SnO2 nanoparticles with size in the range of 5-10 nm and a polycrystalline structure are homogeneously supported on graphene nanosheets. The charge and discharge capacities of SGN attained to 1559.7 and 779.7 mAh/g in the first cycle …
Eoarchaean Crustal Growth In West Greenland (Itsaq Gneiss Complex) And In Northeastern China (Anshan Area): Review And Synthesis, Allen P. Nutman, Vickie C. Bennett, Clark R L Friend, Frances Jenner, Yusheng Wan, Dunyi Liu
Eoarchaean Crustal Growth In West Greenland (Itsaq Gneiss Complex) And In Northeastern China (Anshan Area): Review And Synthesis, Allen P. Nutman, Vickie C. Bennett, Clark R L Friend, Frances Jenner, Yusheng Wan, Dunyi Liu
Faculty of Science - Papers (Archive)
Eoarchaean crust in West Greenland (the Itsaq Gneiss Complex, 3870-3600 Ma) is >80% by volume orthogneisses derived from plutonic tonalite-trondhjemite-granodiorite (TTG) suites,3850, c. 3810 and c. 3710 Mahave some compositional similarities to modern island arc basalts (IAB), suggesting their origin by hydrous fluxing of a suprasubduction-zone upper mantle wedge. Most of the Eoarchaean tonalites match in composition high-silica, low-magnesian adakites, whose petrogenesis is dominated by partial melting of garnetiferous mafic rocks at high pressure. However, associated with the tonalites are volumetrically minor more magnesian quartz diorites, whose genesis probably involved melting of depleted mantle to which some slab-derived component had …
U-Pb Zircon Geochronology And Nd Isotopic Signatures Of The Pre-Mesozoic Metamorphic Basement Of The Eastern Peruvian Andes: Growth And Provenance Of A Late Neoproterozoic To Carboniferous Accretionary Orogen On The Northwest Margin Of Gondwana, A Cardona, U G. Cordani, J Ruiz, V A. Valencia, R Armstrong, D Chew, A Nutman, A W. Sanchez
U-Pb Zircon Geochronology And Nd Isotopic Signatures Of The Pre-Mesozoic Metamorphic Basement Of The Eastern Peruvian Andes: Growth And Provenance Of A Late Neoproterozoic To Carboniferous Accretionary Orogen On The Northwest Margin Of Gondwana, A Cardona, U G. Cordani, J Ruiz, V A. Valencia, R Armstrong, D Chew, A Nutman, A W. Sanchez
Faculty of Science - Papers (Archive)
This study integrates U-Pb zircon geochronology (from LAM-ICP-MS, SHRIMP, and TIMS) with Nd isotopic data from orthogneisses and metasedimentary rocks of the pre-Mesozoic basement of the eastern Peruvian Andes to provide new information on the tectonic evolution and Neoproterozoic-Paleozoic paleogeography of this segment of the proto-Andean margin. A high-grade orthogneiss unit yields U-Pb zircon protolith crystallization ages of ~613 Ma. It was metamorphosed and intruded by an Early Ordovician granitoid. Subsequently, two different volcano-sedimentary sequences were laid down and metamorphosed, probably as a consequence of terrane accretion. The older sequence was deposited and metamorphosed between 450 and 420 Ma, and …
Demographic Feedback Between Clonal Growth And Fragmentation In An Invasive Seaweed, Jeffrey T. Wright, Andrew R. Davis
Demographic Feedback Between Clonal Growth And Fragmentation In An Invasive Seaweed, Jeffrey T. Wright, Andrew R. Davis
Faculty of Science - Papers (Archive)
Many abundant plants, invertebrates, and seaweed are clonal, and this allows the formation of high-density aggregations, foraging, and the placement of modules into new space, and rapid rates of expansion. For these species, population density and rates of expansion are functions of recruitment of asexual modules and post-recruitment vegetative growth and survivorship. In this study, we provide the first experimental test of the relative importance of these two processes in determining the abundance of a clonal seaweed using Caulerpa taxifolia, an invasive green alga that spreads rapidly and reaches very high abundance. We asked two main questions: What is …
Enhanced Tumor Growth In Uv-Irradiated Skin Is Associated With An Influx Of Inflammatory Cells Into The Epidermis, Ronald Sluyter, Gary M. Halliday
Enhanced Tumor Growth In Uv-Irradiated Skin Is Associated With An Influx Of Inflammatory Cells Into The Epidermis, Ronald Sluyter, Gary M. Halliday
Faculty of Science - Papers (Archive)
UV radiation causes a number of cellular changes within the skin which play a role in tumor outgrowth, including immunosuppression and production of growth-enhancing cytokines, Both of these enable tumors to grow but their relative importance in carcinogenesis is poorly defined. In this study, C3H/HeN mice were exposed to a single inflammatory dose of 410 mJ/cm(2) UVB radiation (plus 100 mJ/cm2 UVA radiation) followed by the inoculation of a regressor squamous cell carcinoma into or the painting of oxazolone onto the treated skin. Tumors transplanted 2 or 3 but not 4 days after irradiation had a significantly higher growth rate …