heterocyst

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heterocyst

(hĕt′ər-ə-sĭst′)
n.
A large, thick-walled, nitrogen-fixing cell that occurs at intervals along the filaments of certain cyanobacteria.

heterocyst

a specialized CELL responsible for NITROGEN FIXATION in certain CYANOBACTERIA.
References in periodicals archive ?
Ohmori, The pknH gene restrictively expressed in heterocysts is required for diazotrophic growth in the cyanobacterium Anabaena sp.
(b) Intraoperative frozen pathology of thyroid isthmus: red arrow for heterocyst; blue arrow for psammoma body; green arrow for papillary structure.
(MBFG VII) to filaments with heterocyst, Anabaena circinalis and Aphanizomenon flos-aquae (MBFG III), with subsequent prevalence of filamentous species without heterocyst, Planktothrix agardhii and Geitlerinema splendidum, when there is an increase in ammoniacal nitrogen concentrations.
It is represented by free floating trichomes with heterocysts intercalated and akinetes (Van Geel et al., 1994; Komarek & Komarkova-Legnerova, 2002).
Within an hour, these cells could be seen attached to heterocysts in the same manner as in the two-membered culture (Fig.
There is some debate whether the presence of heterocysts means
The presence of heterocysts indicate that five of the cyanobacterial species potentially fix [N.sub.2].
in this genus ability of gliding motility and lake of heterocysts and akinetes are not formed.
Furthermore, some species have developed the ability to fix nitrogen through specialized cells called heterocysts (Wehr and Sheath, 2003).
Approximately 10 Anabaena species were identified in the fresh material; however, establishing the dominant species when counting was difficult, as frequently only pieces of filaments without akinetes and heterocysts were found in the counting chamber.
Cyanobacterial heterocysts were estimated using an inverted microscope and Sedgwick-Rafter counting chamber.
Some cyanobacterial genera can fix nitrogen in specialized cells called heterocysts, which form a monophyletic lineage.