Living things produce anti-compound,which has the function of restraining,expelling and poisoning,and make chemical defense in the struggle of existence.

Under the selection pressure of food intake of animal and microorganism derives botanical counteractive matter from the secondary metabolic process.

Extraction of antimicrobial substances from fermentation of bacillus amyloliquefaciens Q-12 by ultra filtration;

The main factors affecting the extraction of the antimicrobial substance from Bacillus subtilis fmbR strain using Plackett-Burman Design;

Inducement and activity analysis of the antimicrobial substances extracted from Cyclopelta parva Distant;

we report a kind of new preliminary isolation way of bacterium producing antibiotic substance: cultur-ing bacterium by Ep tubes and isolation bacterium by paper disk test.

The antibiotic substance produced by Rhizopus chinesis 12 is special active against spore forming bacteria.

The antibiotic substance produced from Rhizopus chinesis 12 exist in fermentation solution.

Induction and characterization of antibacterial substances in the blowfly Lucilia sericata;

Studies on antibacterial substance from the haemolymph of Musca Domestica L induced by injection of Escherichia Coli;

Antibacterial activity of antibacterial substances induced in the housefly at different pH levels