11053 to 11064 of 14084 results
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 […]
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 […]
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 […]
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, […]
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 […]
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 […]
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, […]
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 […]
The Antarctic Peninsula region represents our best natural laboratory to investigate how earth’s major climate systems interact and how such systems respond to rapid regional warming. The scale of environmental […]
A mesospheric front was observed with an allsky airglow imager on the night of 9–10 July 2007 at Ferraz Station (62 degrees S, 58 degrees W), located on King George […]
The distributions of many marine birds, particularly those that are highly pelagic, remain poorly known outside the breeding period. Here we use geolocator-immersion loggers to study trans-equatorial migration, activity patterns […]
The passage of a volcanic plume produced by the eruption of Eyjafjallajökull volcano in April 2010 was measured by the sunesky radiometers of the new European SkyRad (ESR) network. This […]