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Articles 1 - 8 of 8

Full-Text Articles in Social and Behavioral Sciences

Seagrass Species - Are They Spectrally Distinct?, S. K. Fyfe, A. G. Dekker Jul 2001

Seagrass Species - Are They Spectrally Distinct?, S. K. Fyfe, A. G. Dekker

Faculty of Science - Papers (Archive)

The spectral reflectance of 3 species of seagrass was measured in different habitats at 3 estuaries in southeastern Australia during each of the 4 seasons of 2000. Seagrass species were spectrally distinct regardless of whether the leaves were fouled by epibionts even though spatial and temporal variability in reflectance was observed within each species. The visible wavelengths that penetrate water fortunately coincide with the regions of maximum absorption by plant photosynthetic and accessory pigments. Mapping of benthic plants to species level is possible using a hyperspectral sensor that has narrow bands centred on pigment-related spectral features in the visible, e ...


Phinocytic Loading Of Cytochrome C Into Intact Cells Specifically Induces Caspase-Dependent Permeabilization Of Mitochondria: Evidence For A Cytochrome C Feedback Loop, K. J. Gilmore, H. E. Quinn, M. R. Wilson Jan 2001

Phinocytic Loading Of Cytochrome C Into Intact Cells Specifically Induces Caspase-Dependent Permeabilization Of Mitochondria: Evidence For A Cytochrome C Feedback Loop, K. J. Gilmore, H. E. Quinn, M. R. Wilson

Faculty of Science - Papers (Archive)

Previous studies introduced cytochrome c into intact cells via the disruptive techniques of microinjection or electroporation to provide support for the hypothesis that, in whole cells, cytochrome c release from mitochondria triggers caspase activation and other degradative changes. However, the types of measurements that could be undertaken with these techniques was limited. We used the simple and relatively gentle technique of pinocytic loading to demonstrate that, in intact cells, cytosolic cytochrome c specifically induced activation of caspase-3- and -9-like enzymes, and a loss of mitochondrial polarization coincident with an increase in mitochondrial permeability. Our results support the prediction from in ...


Conducting Polymer-Carbon Nanotubes Composites, May Tahhan, N. Barisci, Gordon G. Wallace Jan 2001

Conducting Polymer-Carbon Nanotubes Composites, May Tahhan, N. Barisci, Gordon G. Wallace

Faculty of Science - Papers (Archive)

During the course of this work, three different approaches to the formation of conducting polymer/carbon nanotube (CP/CNT) composites were investigated. The first approach involved the preparation of CNT dispersions using Poly methoxy aniline-5-sulfonic acid (PMAS) as a stabilizer. The second approach investigated involved the use of CNT as the dopant in the electropolymerization of CPs. The third approach involved the electrochemical deposition of a thin polymer film onto the surface of CNT paper. These CNT/CP composites were characterized to determine capacitance, conductivity and mechanical strength.


Human-Induced Stresses On Mangrove Swamps Along The Kenyan Coast, P. A. O. Abuodha, J. G. Kairo Jan 2001

Human-Induced Stresses On Mangrove Swamps Along The Kenyan Coast, P. A. O. Abuodha, J. G. Kairo

Faculty of Science - Papers (Archive)

Mangroves form important ecosystems in Kenya's coastal areas. They produce goods and services that are of environmental, ecological and economic importance to human society. However, mangroves are under continuing pressure from anthropogenic disturbances. A particular concern has been the clearing of mangrove areas to reclaim land for other uses such as aquaculture, salt manufacture, agriculture and housing. About 10 000 ha of mangrove areas have been cleared for salt manufacture between Ngomeni and Karawa, while in Lamu, close to 100 ha of mangrove forest was killed by dredged-up sediment that was deposited during the construction of the Mokowe sea ...


Molecular Dynamics Simulation Of Biomolecular Systems, Wilfred Van Gunsteren, Dirk Bakowies, Roland Buergi, Indira Chandrasekhar, Markus Christen, Xavier Daura, Peter Gee, Alice Glaettli, Tomas Hansson, Chris Oostenbrink, Christine Peter, Jed Pitera, Lukas Schuler, Thereza Soares, Haibo Yu Jan 2001

Molecular Dynamics Simulation Of Biomolecular Systems, Wilfred Van Gunsteren, Dirk Bakowies, Roland Buergi, Indira Chandrasekhar, Markus Christen, Xavier Daura, Peter Gee, Alice Glaettli, Tomas Hansson, Chris Oostenbrink, Christine Peter, Jed Pitera, Lukas Schuler, Thereza Soares, Haibo Yu

Faculty of Science - Papers (Archive)

The group for computer-aided chemistry at the ETH Zurich focuses its research on the development of methodology to simulate the behavior of biomolecular systems and the use of simulation techniques to analyze and understand biomolecular processes at the atomic level. Here, the current research directions are briefly reviewed and illustrated with a few examples.


A Glu-496 To Ala Polymorphism Leads To Loss Of Function Of The Human P2x7 Receptor, Ben J. Gu, Weiyi Zhang, Rebecca A. Worthington, Ronald Sluyter, L Phuong Dao-Ung, Stephen Petrou, J A. Barden, James Wiley Jan 2001

A Glu-496 To Ala Polymorphism Leads To Loss Of Function Of The Human P2x7 Receptor, Ben J. Gu, Weiyi Zhang, Rebecca A. Worthington, Ronald Sluyter, L Phuong Dao-Ung, Stephen Petrou, J A. Barden, James Wiley

Faculty of Science - Papers (Archive)

P2X(7) receptor is a ligand-gated cation-selective channel that mediates ATP-induced apoptosis of cells of the immune system. We and others have shown that P2X(7) is nonfunctional both in lymphocytes and monocytes from some subjects. To study a possible genetic basis we sequenced DNA coding for the carboxyl-terminal tail of P2X(7). In 9 of 45 normal subjects a heterozygous nucleotide substitution (1513A-->C) was found, whereas 1 subject carried the homozygous substitution that codes for glutamic acid to alanine at amino acid position 496. Surface expression of P2X(7) on lymphocytes was not affected by this E496A polymorphism ...


Detection Of P2x Purinergic Receptors On Human B Lymphocytes, Ronald Sluyter, J A. Barden, James Wiley Jan 2001

Detection Of P2x Purinergic Receptors On Human B Lymphocytes, Ronald Sluyter, J A. Barden, James Wiley

Faculty of Science - Papers (Archive)

B lymphocytes are known to synthesise the P2X(7) subtype of the P2X purinergic receptor family; however, the identification of the other six P2X subtypes on these cells has been limited by the absence of specific antibodies. In this study, we used a panel of anti-P2X polyclonal antibodies and confocal microscopy to examine the presence of each P2X receptor on human B lymphocytes. We observed that P2X(1), P2X(2), P2X(4) and P2X(7) subtypes, but not P2X(3), P2X(5) and P2X(6) subtypes, are present on B lymphocytes.


Thermoregulation In Juvenile Red Kangaroos (Macropus Rufus) After Pouch Exit: Higher Metabolism And Evaporative Water Requirements, Adam J. Munn, Terence J. Dawson Jan 2001

Thermoregulation In Juvenile Red Kangaroos (Macropus Rufus) After Pouch Exit: Higher Metabolism And Evaporative Water Requirements, Adam J. Munn, Terence J. Dawson

Faculty of Science - Papers (Archive)

The population dynamics of red kangaroos (Macropus rufus) in the Australian arid zone is tightly linked with environmental factors, which partly operate via the survival of juvenile animals. A crucial stage is the young-at-foot (YAF) stage when kangaroos permanently exit the pouch. We have examined the thermal biology of YAF red kangaroos during ages from permanent pouch exit until weaning. Over a wide range of environmental temperatures (ambient temperature [T-a] -5 degrees to 45 degreesC), YAF red kangaroos had a mass-specific metabolism that was generally twice that of adults, considerably higher than would be expected for an adult marsupial of ...