‘The antibiotics’ are secondary metabolites or biochemical secreted by microorganisms which, ‘ in low concentration, inhibit the growth or kill other microorganisms, i.e., the antibiotics are ‘antimicrobial agents of microbial origin’. Although some 6,000 antibiotics are known to exist, only about 100 are marketed. About 200 new antibiotics are discovered every year. Microorganisms belonging to […]