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  Antibiosis

Antibiosis:

The word ‘antibiosis’ usually refers to the whole or partial inhibition or death of one organism by the other via the production of some substance or environmental conditions as an outcome of metabolic pathways. In this, none of them derives any advantage. These substances and or circumstances are injurious (antagonistic) to other organism. The phenomenon of antibiosis is much general among microbial world. The production of chemicals which are antagonistic to microbes – the antibiotics is familiar.

Bacteria, actinomycetes and fungi generate a number of antimicrobial substances that are widespread in nature. Antagonistic substances are too reported in some algae, as for illustration in cultures of Chorella vulgaris, certain substance accumulates that inhibits the growth of the diatom, Nitxschia frustrulum. Pond ‘blooms’ of blue-green algae particularly Microcystis are recognized to generate toxins like hydroxylamine that causes death of fish and cattle.

The word antibiosis would also comprise such phenomena as hypersensitive reactions which include the interaction between microorganisms, specifically pathogenic ones, and injurious to one or both.

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