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Keyword: cyanobacteria

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  • Greening of the Earth Pushed Way Back in Time

    07/27/2013 8:38:30 PM PDT · by SunkenCiv · 12 replies
    Science Daily ^ | July 22, 2013 | University of Oregon
    Conventional scientific wisdom has it that plants and other creatures have only lived on land for about 500 million years, and that landscapes of the early Earth were as barren as Mars. A new study, led by geologist Gregory J. Retallack of the University of Oregon, now has presented evidence for life on land that is four times as old -- at 2.2 billion years ago and almost half way back to the inception of the planet. That evidence... involves fossils the size of match heads and connected into bunches by threads in the surface of an ancient soil from...
  • A New Form of Chlorophyll?

    08/30/2010 1:42:40 AM PDT · by neverdem · 6 replies
    Scientific American ^ | August 19, 2010 | Ferris Jabr
    Researchers discover evidence for a new type of chlorophyll in cyanobacteria that can absorb near-infrared lightResearchers may have found a new form of chlorophyll, the pigment that plants, algae and cyanobacteria use to obtain energy from light through photosynthesis. Preliminary findings published August 19 in Science suggest that the newly discovered molecule, dubbed chlorophyll f, has a distinct chemical composition when compared with the four known forms of chlorophyll and can absorb more near-infrared light than is typical for the photosynthetic pigments. Chlorophyll f, which was extracted from cultures of cyanobacteria and other oxygenic microorganisms, may allow certain photosynthetic life...
  • Finding Mars between the cracks

    03/18/2004 7:26:02 PM PST · by LibWhacker · 68+ views ^ | 3/19/04 | Jim Gilchrist
    JIM GILCHRIST Charles Cockell opens a growth chamber, tucked away within the Cambridge headquarters of the British Antarctic Survey, to expose rows of Petri dishes. He picks one of them up, its interior slicked with tell-tale green. "These are going into space," he says, matter-of-factly. In the corridor outside hangs a stuffed albatross, a trophy from some bygone Antarctic expedition, but the still-living life forms in the Petri dishes have been gleaned on much more recent trips, and not just to Antarctica. These are photosynthetic cyanobacteria - "extremophiles" as they’re known - some from the Antarctic, but others collected in...