Microbial microdiversity
Article Abstract:
Prochlorococcus is a bacterial group which was discovered in the late 1980s and which could be the component of marine photoplankton that is most abundant. The group can grow well when subjected to a large variety of light conditions. Populations coexist which are genetically adapted to large differences in levels of light. Organisms cannot always be cultivated using classic methods for identification, but genes can be cloned, sequenced and then the organisms that the genes came from can be identified. This method has changed approaches to identifying microbes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Coral provides way to age deep water
Article Abstract:
It is possible to use measurements of the ages of solitary corals that lived in the deep sea to calculate the ratio of the isotopes carbon-14 to carbon-12 in deep water from the past. The thorium/uranium ratio in the coral gives its true age, while the carbon-14 signature indicates the age of the coral plus the age of the deep-water dissolved inorganic carbon, from which it is made. Thus, taking the thorium/uranium age from that of carbon-14 gives the age of the deep water at the time the coral was formed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Marine phosphorus is selectively remineralized
Article Abstract:
Phosphorus is an important nutrient in oceans and is found in surface waters where it is linked to dissolved organic matter (DOM). Organic phosphorus in DOM is significantly different in abundance and composition from phosphorus found in fresh organic matter. Dissolved organic phosphorus thus appears to be preferentially remineralized from DOM. Marine microorganisms' nutrient demands appear to lead to selective removal of phosphorus. Phosphorus levels impose constraints in some surface waters.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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