11725 to 11736 of 14037 results
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RADAR: the Cassini Titan radar mapper
Read more of: RADAR: the Cassini Titan radar mapperThe Cassini RADAR instrument is a multimode 13.8 GHz multiple-beam sensor that can operate as a synthetic-aperture radar (SAR) imager, altimeter, scatterometer, and radiometer. The principal objective of the RADAR […]
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Tidal modulation of the gravity-wave momentum flux in the Antarctic mesosphere
Read more of: Tidal modulation of the gravity-wave momentum flux in the Antarctic mesosphereAirglow imager and dynasonde/IDI radar wind measurements at Halley Station, Antarctica (76degreesS, 27degreesW) have been used to estimate the diurnal variation of the vertical fluxes of horizontal momentum carried by […]
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Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere
Read more of: Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphereAirglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6degreesS, 26.6degreesW) have been used to estimate the seasonal variation of the vertical fluxes of horizontal […]
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Eight glacial cycles from an Antarctic ice core
Read more of: Eight glacial cycles from an Antarctic ice coreThe Antarctic Vostok ice core provided compelling evidence of the nature of climate, and of climate feedbacks, over the past 420,000 years. Marine records suggest that the amplitude of climate […]
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Latitudinal and seasonal variations of quasiperiodic and periodic VLF emissions in the outer magnetosphere
Read more of: Latitudinal and seasonal variations of quasiperiodic and periodic VLF emissions in the outer magnetosphereWe have analyzed ELF-VLF receiver and search coil magnetometer data from five Antarctic stations from 1998 and 1999 to study quasiperiodic emissions (QPs) and periodic emissions (PEs), which occur as […]
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The role of Raman spectroscopy as an astrobiological tool in the exploration of Mars
Read more of: The role of Raman spectroscopy as an astrobiological tool in the exploration of MarsWe describe how the exploration of the Martian environment would be considerably enhanced through the use of Raman spectroscopy. Furthermore, Raman spectroscopy is particularly suited for both mineralogical analysis of […]
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Biological modification of haematite in Antarctic cryptoendolithic communities
Read more of: Biological modification of haematite in Antarctic cryptoendolithic communitiesDetailed FT-Raman spectra of Antarctic cryptoendolithic colonies in Beacon sandstone have revealed some novel information about the biogeological modification process involving iron(III) mobilization by the organism. The previously unreported but […]
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Stratified response to environmental stress in a polar lichen characterized with FT-Raman microscopic analysis
Read more of: Stratified response to environmental stress in a polar lichen characterized with FT-Raman microscopic analysisThe role of Antarctic epilithic lichens in the primary colonization of rocks and in the formation of soils is receiving attention because of the production of the stress-protective biochemicals needed […]
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Raman spectroscopy of senescing snow algae: pigmentation changes in an Antarctic cold desert extremophile
Read more of: Raman spectroscopy of senescing snow algae: pigmentation changes in an Antarctic cold desert extremophileThe FT-Raman spectra are described of green and red snow algae, Chlamydomona, involved in the colonization of exposed surfaces of the McLeod Glacier, Jane Col, Signy Island, situated at the […]
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Protective pigmentation in UVB-screened Antarctic lichens studied by Fourier transform Raman spectroscopy: an extremophile bioresponse to radiation stress
Read more of: Protective pigmentation in UVB-screened Antarctic lichens studied by Fourier transform Raman spectroscopy: an extremophile bioresponse to radiation stressFT-Raman spectra were obtained for two Antarctic extremophiles, the epilithic lichens Xanthoria elegans and Caloplaca sublobulata from the maritime ecological long-term research site on Leonie Island. Twelve specimens from cloches […]