| Marine oscillatoria (Trichodesmium): explanation for aerobic nitrogen fixation without heterocysts. | |
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MedLine Citation:
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PMID: 1257749 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nitrogen fixation in marine Oscillatoria appears to be associated with differentiated cells located in the center of the colony. These central cells exhibit reduced pigmentation relative to peripherally located cells and do not incorporate 14CO2 in photosynthesis. Central cells apparently do not produce O2 which would deactivate nitrogenase. When central cells are exposed to O2 via disruption of the colonies, N2 fixation (acetylene reduction) decreases sharply even though individual trichomes remain intact. Disruption of colonies in the absence of O2 does not cause reduced nitrogenase activity. In the sea, turbulence from wave action apparently separates trichomes allowing O2 to enter thus decreasing nitrogenase activity. These observations explain how Oscillatoria is able to fix N2 without heterocysts in an aerobic environment and why it blooms virtually always occur in calm seas. |
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Authors:
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E J Carpenter; C C Price |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 191 ISSN: 0036-8075 ISO Abbreviation: Science Publication Date: 1976 Mar |
Date Detail:
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Created Date: 1976-05-20 Completed Date: 1976-05-20 Revised Date: 2007-03-19 |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1278-80 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Algae
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cytology,
metabolism* Nitrogen Fixation* / drug effects Oxygen / pharmacology |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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