Publications

10945 to 10956 of 13980 results

1. An assessment of carbon oxidation processes in contrasting maritime Antarctic lakes

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2. Astrobiological instrumentation for Mars – the only way is down

   In this paper, in this edition of the Journal commemorating the life and work of David Wynn-Williams, we consider approaches to the astrobiological investigation of Mars. We provide a brief […]

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3. Why Raman spectroscopy on Mars? – a case of the right tool for the right job

   We provide a scientific rationale for the astrobiological investigation of Mars. We suggest that, given practical constraints, the most promising locations for the search for former life on Mars are […]

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4. The human exploration of the Martian poles Part 2 – support technologies

   In Part 1 of this paper, we presented a phased approach to the development of a Mars pole human-inhabited research station modelled on those in the terrestrial polar regions. To […]

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5. Fourier-transform Raman spectroscopic studies of chronological change in stromatolitic cores from Antarctic lake sediments

   The Fourier transform-Raman spectra of two lacustrine sediment cores from Antarctic sites are reported. The Lake Hoare specimens were predominantly calcium carbonate, quartz and β-carotene, with chlorophyll and calcium sulphate […]

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6. Non-destructive analysis of pigments and other organic compounds in lichens using Fourier-transform Raman spectroscopy: a study of Antarctic epilithic lichens

   Lichens in Antarctic habitats are subjected to environmental extremes, including UVB radiation, desiccation and low temperatures, as well as to rapid fluctuations in these. Lichens synthesise a variety of chemical […]

   Read more of: Non-destructive analysis of pigments and other organic compounds in lichens using Fourier-transform Raman spectroscopy: a study of Antarctic epilithic lichens

7. Laser wavelength selection for Raman spectroscopy of microbial pigments in situ in Antarctic desert ecosystem analogues of former habitats on Mars

   The vital ultraviolet- (UV-) protective and photosynthetic pigments of cyanobacteria and lichens (microbial symbioses) that dominate primary production in Antarctic desert ecosystems auto-fluoresce at short wavelengths. We therefore use a […]

   Read more of: Laser wavelength selection for Raman spectroscopy of microbial pigments in situ in Antarctic desert ecosystem analogues of former habitats on Mars

8. Molecular structural studies of lichen substances II: atranorin, gyrophoric acid, fumarprotocetraric acid, rhizocarpic acid, calycin, pulvinic dilactone and usnic acid

   The FT-Raman and infrared vibrational spectra of some important lichen compounds from two metabolic pathways are characterised. Key biomolecular marker bands have been suggested for the spectroscopic identification of atranorin, […]

   Read more of: Molecular structural studies of lichen substances II: atranorin, gyrophoric acid, fumarprotocetraric acid, rhizocarpic acid, calycin, pulvinic dilactone and usnic acid

9. Molecular spectroscopic studies of lichen substances 1: parietin and emodin

   The Raman and infrared spectra of the UV-radiation protectant parietin extracted from Xanthorialichen species are reported and vibrational assignments made of key features which are important for the characterisation of […]

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10. Raman spectroscopic detection of biomolecular markers from Antarctic materials: evaluation for putative Martian habitats

    The vital UV-protective and photosynthetic pigments of cyanobacteria and lichens (microbial symbioses) that dominate primary production in Antarctic desert ecosystems auto-fluoresce at short-wavelengths. A long wavelength (1064 nm) near infra-red […]

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11. Guest editorial to special issue dedicated to David D. Wynn-Williams

    Project Leader, Antarctic Astrobiology, British Antarctic Survey, Cambridge 1946–2002 David Donaldson Wynn-Williams, born 16th July, 1946, in West Kirby, Cheshire, UK and Founding Editor of the International Journal of Astrobiology, […]

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12. Chariocrinus – (Crinoidea: Articulata) from the Latady Formation, Behrendt and Hauberg Mountains, Ellsworth Land, Antarctica

    Specimens of a late Bajocian to early Callovian isocrinid assigned to Pentacrinites cf. P. californicus (Clark), and specimens collected by Hikuroa in 1999–2000, are described as a new species of […]

    Read more of: Chariocrinus – (Crinoidea: Articulata) from the Latady Formation, Behrendt and Hauberg Mountains, Ellsworth Land, Antarctica