Nostoc


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Related to Nostoc: cyanobacteria, spirulina

Nostoc

 

a genus of blue-green algae of the class Hor-mogonaceae. There are approximately 50 species, living in almost all climatic zones, in fresh waters and on damp cliffs and soil. Colonies of the algae are gelatinous and spherical, with a diameter of up to 10 cm. They resemble tapes or filaments and are free-living or sedentary. The colonies consist of single rows of filaments buried in the slime. Each filament is composed of thick-walled cells called heterocysts. The algae reproduce by spores or vegetatively, with bits of the filaments breaking off. There are some nitrogen-fixing species. Some species of Nostoc are used as food in Asian countries.

References in periodicals archive ?
The floating algae comprised a combination of senescing Cladophora heavily covered with epiphytes containing cyanobacterial endosymbionts and Nostoc, also a cyanobacterium, which shows dramatic biomass expansion when nitrogen becomes limiting.
Phycoremediation of municipal Pune, India [30] wastewater using Oscillatoria and Nostoc commune obtained from Mula-Mutha river.
Phylogenetic and morphological evaluation of the genera Anabaena, Aphanizomenon, Trichormus and Nostoc (Nostocales, Cyanobacteria).
polymorpha forma asociaciones simbioticas con especies de cianobacterias siendo las especies de Nostoc las mas frecuentemente encontradas (Pierik, 1990; Schofield, 1996; Frahm, 2003; Mayz, 2004).
II and Nostoc sp) showed good growth up to 14 days of incubation in medium supplemented with commercial textile dyes (10 mg [L.sup.-1]).
It includes species from the genera Anabaena, Aphanizomenon, Chrococcus, Coelomorum, Coelosphaerium, Cylindrospermopsis, Cylindrospermum, Gomphosphaeria, Lyngbya, Merismopedia, Microcystis, Nostoc, Oscillatoria, Phormidium, Planktothrix, Pseudoanabaena, Rhaphidiopsis and Synecocystis.
Sporobolus vaginiflorus, and the [N.sub.2]-fixing cyanobacterium Nostoc commune had the highest frequency values in another site in Cedars of
The most widespread species was the colonial cyanobacterium, Nostoc commune.