Antibiotics-Apart from giving man several food products, certain microorganisms, especially moulds have given products which are life-saving. The antibiotics are the products of living organisms, which in small proportions could be acting as inhibitory agent for the growth of other microbes. The discovery of Penicillin produced by Penicillium notatum by Sir Alexander Fleming in 1929 has triggered off the
manufacturing of modem antibiotics. There are over 600 antibiotics derived from bacteria and over 150 from fungi. The genus Streptomyces has yielded a wide range of useful antibiotics such as streptomycin, aureomycin, chloromycetin and terramycin. From our discussion above, it is evident that there is a tremendous scope and potential for the use of microorganisms towards meeting the growing world demand for food, through an efficient utilization of available natural food and feed stocks and the transformation of waste materials.