Science

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Now showing 1 - 10 of 19
  • (2000) Lee, Jung; Burton, Michael
    Journal Article

  • (2000) Storey, John; Ashley, Michael; Burton, Michael
    Journal Article
    In order to fully characterize the astronomical potential of remote sites on the antarctic plateau, we have developed a suite of instruments covering UV to sub-millimeter wavelengths. In addition, we have successfully demonstrated the use of an acoustic radar at the South Pole to measure the height of the turbulent atmospheric boundary layer. Each instrument is designed to operate independently and autonomously, producing reliable, fully calibrated data without human intervention. Although designed primarily for use in Antarctica, these instrument use novel technology that is applicable to other astronomical applications as well.

  • (2000) Burton, Michael; Ashley, Michael; Marks, Rodney; Schinckel, Antony; Storey, John; Fowler, Adam; Merrill, M; Sharp, Naomi; Gatley, I; Harper, D; Loewenstein, R; Mrozek, F; Jackson, John; Kraemer, K
    Journal Article

  • (2000) Cotera, Angela; Simpson, John; Erickson, E; Colgan, Sean; Burton, Michael; Allen, David
    Journal Article

  • (2000) Cavicchioli, Ricardo; Thomas, Torsten; Curmi, Paul
    Journal Article
    We live on a cold planet where more than 80% of the biosphere is permanently below 5°C, and yet comparatively little is known about the genetics and physiology of the microorganisms inhabiting these environments. Based on molecular probe and sequencing studies, it is clear that Archaea are numerically abundant in diverse low-temperature environments throughout the globe. In addition, non-low-temperature-adapted Archaea are commonly exposed to sudden decreases in temperature, as are other microorganisms, animals, and plants. Considering their ubiquity in nature, it is perhaps surprising to find that there is such a lack of knowledge regarding low-temperature adaptation mechanisms in Archaea, particularly in comparison to what is known about archaeal thermophiles and hyperthermophiles and responses to heat shock. This review covers what is presently known about adaptation to cold shock and growth at low temperature, with a particular focus on Antarctic Archaea. The review highlights the similarities and differences that exist between Archaea and Bacteria and eukaryotes, and addresses the potentially important role that protein synthesis plays in adaptation to the cold. By reviewing the present state of the field, a number of important areas for future research are identified.

  • (2000) Burton, Michael; Ramsay-Howat, S; Chrysostomou, A; Brand, P
    Journal Article

  • (2000) Wolfe, Joseph; Fearn, Robert
    Journal Article
    Pitch scaling was used to determine the dependence of perceived pitch on rate and place of stimulation in postlingually deafened adult subjects using cochlear implants. For stimulation rates below about 500 pulses per second (pps), perceived pitch is a strong function of both rate and place. In this range, perceived pitch increases logarithmically with stimulation rate, but decreases with distance from the round window. A 2-mm displacement into the cochlea has an effect similar to that of halving the stimulation rate. Place resolution in this context is comparable with the interelectrode spacing (0.75 mm). At rates approaching 1,000 pps, rate has little effect on perceived pitch. An average of bipolar quality judgments showed that periodic pulsatile stimulation is least pleasant when low frequencies are applied to the region closest to the window.


  • (2000) Dzuba, Vladimir; Flambaum, Victor; Ginges, Jacinda
    Journal Article
    Parity ~P! and time ~T! invariance violating effects in the Ra atom are strongly enhanced due to close states of opposite parity, the large nuclear charge Z and the collective nature of (P,T)-odd nuclear moments. We have performed calculations of the atom