They did not undergo gastric operation or endoscopic treatment previously and were confirmed having disorder of epithelium structure or
heterocyst, including dysplasia and carcinoma in situ, by gastroscopy or postoperative histopathological examination.
To study the morphology of cyanobacteria, cell shape, width, color, motility and presence/absence of hormogonial cell, sheath and
heterocyst were recorded.
The result showed psammoma bodies and some
heterocyst. We considered it as micropapillary carcinomas.
Several studies depicted that B is involved in increasing the absorption of N through fixation in
heterocyst cells.
Although the ability of some cyanobacteria in fixing [N.sub.2], none Cyanophyta detected in this work presented
heterocyst cells.
Heterocystscylindric, intercalary, 5-7 [micro]m in diameter and 7-20 [micro]m long, akinetes elongate, cylindric, solitary formed near the middle of the trichome but not adjacent to the
heterocyst, 6-8 [micro]m in diameter and 20-60 [micro]m long (Fig.
Ohmori, "NrrA, a nitrogen-responsive response regulator facilitates
heterocyst development in the cyanobacterium Anabaena sp.
Cyanobacterial
heterocyst glycolipids in cultures and environmental samples: Diversity and biomarker potential.
Cyanobacteria are morphologically diverse and they consist of unicellular, colonial, pseudofilamentous, pseudoparenchymatous uniseriate, filamentous forms unbranched, undifferentiated, differentiated with specialized cells called
heterocyst and akinetes and heterotrichous branched forms [2].
Most of the cyanobionts appear to be heterocystous which is as close to a multicellular organisation as is possible in these bacteria in which hexose, produced by photosynthesis, moves from the vegetative cells to the
heterocyst (Meeks & Elhai, 2002).
In cultures of the two-membered assemblage, 10 to 50 epibiotic cells were attached to each
heterocyst (Fig.
However, the heterocystous cyanobacteria have an 11 kb insertion element present within the coding region of nifD, which is excised by site specific recombination during
heterocyst differentiation.