Azotobacter

Cyst representatives of the genus Azotobacter: visible central body with vacuoles and multi-layered shell.

Representatives of the genus Azotobacter cysts more resistant to adverse factors of the environment than the vegetative cells - for example, cysts twice more resistant to UV radiation than vegetative cells, are resistant to drying, gamma radiation, solar irradiation, Effects of ultrasound, but are not resistant to high temperatures.

The formation of cysts is induced by changing the concentration of nutrients in the nutrient medium and the addition of some organic substances (such as ethanol, n-butanol and ?-gidroksibutirata). Cysts rarely occur in liquid nutrient media. Intsistirovanie can be induced by chemical factors and is accompanied by metabolic changes, changes in the catabolism and breathing, changes in the biosynthesis of macromolecules. A value in the induction intsistirovaniya has aldegiddegidrogenaza, as well as the regulator reply AlgR.

Cyst azotobaktera - spherical body consisting of the so-called central body: the reduced copy of the vegetative cells with a large number of vacuoles, and the double hull, the inner part of which is called the intima and fibrous structure, and is called external ekzina and represented a level that reflects the structure with hexagonal crystal structure. Ekzina partially hydrolyzed trypsin and resistant to lysozyme, in contrast to the central body. The central body can be isolated for a viable state of some chelating agents. The main components of the external shell alkilrezortsinoly cysts are composed of long aliphatic chains and aromatic rings . Alkilrezortsinoly also occur in other bacteria, animals and plants.