Bacteria - tiny microbes - are ubiquitous, and they live in the soil and in the water and in the air, in animals and humans.You can meet them both in hot springs and in the polar snows.
Currently, scientists described about 10 thousand species of bacteria, although it is assumed that they are in fact there is much more.The shape and characteristics of associations bacterial cells are divided into the following groups: spherical - cocci.Single individuals called their micrococci, if they are connected in pairs - diplococci.Cocchi, formed a chain, are called streptococci.When the division is done in two planes, resulting in formation tetrakokki which consist of 4 cells.Sartsiny appear when divided in three planes, and contain from 8 to 18 cocci.Sometimes fission occurs randomly, and cocci form cluste
rs that resemble bunches of grapes - staphylococci;rod-shaped bacteria often arranged singly.Their shape can be straight or slightly curved, sometimes spindle.Coli, which does not form spores, called - bacteria and spore - bacilli and clostridia;spirillum and vibrio - a form of convoluted forms of bacteria, having the form of a spiral.Cage vibrio slightly bent and resembles a comma at the end it is the flagellum.The most famous vibrio, perhaps, can be attributed cholera.Spirillae also have a spiral curl 2-3 and virtually harmless.
Pathogenic organisms that when ingested human or animal to cause a variety of infectious diseases, isolated in a special group.Due to the rapid growth and reproduction, they are extremely resistant to external factors and in some cases are even used as a biological weapon.Known for a number of diseases caused by bacteria: diphtheria, tuberculosis, plague, anthrax, tetanus, various skin, intestinal and genital infections.However, a person hardly would have been without microbes.In everyday life, including food popular curds, yogurts and kefir.And they can not be prepared without the participation of lactic acid bacteria, responsible for clotting milk.And the living lactic acid bacteria in the digestive tract, play the role of defenders of the body, protecting the intestine from invasion by pathogens and not allowing him to "upset."