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Microorganisms<br>All the existing microorganisms can be divided into two main groups-aerobic and anaerobic. Aerobic microorganisms must have atmospheric free oxygen for their life and growth. However one knows that free oxygen is not favourable for the development of anaerobic microorganisms.<br>They were divided into groups. Spherical bacteria have been called cocci. They are also divided into several different groups. Rod shaped (chopsticks) material are called baicili<br>When bacteria multiply they divide. The growing organisms increases in size up to a certain limit and in due time divides. The process of division depends on the conditions of the environment.<br>The smallest) virulent microorganisms may involve the human body. But in the local protection agencies of human organizations, they are destroying. In this case, there is no disease.<br>However the local protective agents of the human organism are not always able to destroy completely the invading microorganisms. It is known that in such a case, a local or general infection may be occur.<br>Most micro organic pollutants produce diseases when they enter the tissue and destroy it. If there is an example in microscope the alveoli of the lung of the man with lobar pneumatia a great number of pneumatocci, it can be revealed While the disease persists the lung may be considerably impaired because of the consolidations which may develop in it.<br>However, human organizations can fight against small organizations, including through their first protective barriers, i.e.skin and mucous memories.<br>The prominent Russian scientist I.I.Mechnikov had made many investigations before he was able to come to the conclusion that leuccytes could catch and destroy certain microbes. I.I.Mechnikov called them phagocytes or microbe cell destroyers.<br>
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