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.