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Abbreviations: hc - heterocyst, ak - akinete, hm - hormogonium, nd - necridia Heterocysts or heterocytes are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria , such as Nostoc , Cylindrospermum , and Anabaena . [ 1 ]
Intercalary located akinete of Dolichospermum smithii Terminally located akinete of Gloeotrichia. An akinete is an enveloped, thick-walled, non-motile, dormant cell formed by filamentous, heterocyst-forming cyanobacteria under the order Nostocales and Stigonematales.
Cyanobacterial cell division and cell growth mutant phenotypes in Synechocystis, Synechococcus, and Anabaena.Stars indicate gene essentiality in the respective organism. While one gene can be essential in one cyanobacterial organism/morphotype, it does not necessarily mean it is essential in all other cyanobacteria.
Spherical colonies of radiating straight trichomes (filaments without sheaths). Each trichome has an akinete as the basal cell near the center of the colony. Akinetes if present are adjacent the heterocyst. The primary morphology is trichomous (filamentous without sheaths), the secondary is colonial. The mucilaginous sheath is top short at the ...
However, filamentous heterocyst ... and cell death has been suggested to play a key role in developmental processes, such as akinete and heterocyst ... Formation of ...
Heterocyst formation is inhibited in the presence of a fixed nitrogen source, such as ammonium or nitrate. [6] Therefore, maintenance is dependent on an enzyme called hetN. An alternate method involves the bacteria entering a symbiotic relationship with certain plants. In such relationships, the bacteria does not respond to the availability of ...
The process in which light changes the shape of molecules in the retina, thereby driving the cellular reactions and signals that cause vision in vertebrates, is studied in Anabaena. Anabaena sensory rhodopsin, a specific light-sensitive membrane protein, is central to this research.
The heterocyst is a terminal single cell within which nitrogen fixation occurs, while the rest of the trichome is made up of vegetative cells within which photosynthesis occurs. [2] Some Richelia are made up of many vegetative cells and a terminal heterocyst , while others only contain a terminal heterocyst . [ 3 ]