Heterocysts are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica. They fix nitrogen from dinitrogen (N2) in the air using the enzyme nitrogenase, in order to provide the cells in the filament with nitrogen for biosynth...
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http://en.wikipedia.org/wiki/Heterocyst
• (n.) A cell larger than the others, and of different appearance, occurring in certain algae related to nostoc.
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http://thinkexist.com/dictionary/meaning/heterocyst/
(from the article `blue-green algae`) ...the gaseous nitrogen of the air into compounds that can be used by living cells. Particularly efficient nitrogen fixers are found among the ...
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http://www.britannica.com/eb/a-z/h/44
<biology> Specialised cell type found at regular intervals along the filaments of certain Cyanobacteria, site of nitrogen fixation. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
Specialised cell in filamentous cyanobacteria frequently associated with nitrogen fixation.
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Specialized cell type found at regular intervals along the filaments of certain Cyanobacteria; site of nitrogen fixation.
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http://www.encyclo.co.uk/visitor-contributions.php
Het'er·o·cyst noun [
Hetero- +
cyst .]
(Botany) A cell larger than the others, and of different appearance, occurring in certain algæ related to nostoc.
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http://www.encyclo.co.uk/webster/H/39
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