Chemotactism
The chemotactism indicates the attraction or the repulsion of a unicellular organization. For example, the Bactérie S mobiles can react to stimuli, be attracted by nutritive substances like sugars, the amino-acids, oxygen, or be pushed back by harmful substances.
Proteinic receivers localized on the membrane or in the periplasmic space of the bacteria detect substances of the environment. The fixing of these substances on the receiver induce a change in the rotation of the bacterial Flagelle and involves a modification of the behavior of the bacterium.
In physiology, chemotactism is the capacity of a cell to be reacted to a gradient of a chemical substance.
Positive chemotactism
An organization is attracted towards a substrate. A bacterium is attracted towards nutritive substances.
Reaction of the organization to a Infection. Polynuclear and Macrophage S is attracted by chemical factors by going up the gradient of concentration. These factors are of serum tissue origin and bacterial
Negative chemotactism
The bacterium is pushed back and is maintained with the variation toxic substances.
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