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Alkenones are found in diverse prymnesiophytes including Emiliania huxleyi, which ranges throughout the world ocean. The number of double bonds in alkenones corresponds with growth temperature, and calibrations between sea surface temperature and alkenone unsaturation have been used to establish alkenone unsaturation as a temperature proxy in ancient sediments. Here we report virus infection causes...
Many species of cyanobacteria tolerate exposure to harmful levels of ultraviolet (UV) radiation by producing photoprotective pigments. Scytonemin, found in extracellular polysaccharide sheaths, is produced in abundance when terrestrial or benthic cyanobacteria are exposed to direct sunlight, such as in desert soil crusts and intertidal mats. It is exclusive to cyanobacteria and therefore can serve...
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