دراسة تأثير مستخلصات الاكتينومايسيتات المعزولة من التربة على نمو انواع معينة من البكتريا

Abstract

Thirty isolates of different types of Actinomycetes were isolated from three types of soils (cultural , sandy and salty soils) in Hilla city. These isolates were identified depending on morphological properties and biochemical testes into three types which were Saccharopolyspora erythara , Streptomyces griseus and Streptosporangium sp. The activity of crude extractions of these isolates was studied for inhibition of growth of three bacterial species which were Staphylococcus aureus, Escherichia coli and Bacillus subtilis at three concentrations 10, 50 and 100 g/ml. The most active isolate was Sac. Erythara according to the range of inhibition zone diameters.