Research Journal of Microbiology1816-4935xxxx-xxxxScience International10.3923/jm.2007.606.618Streptomyces endus N40]]>El-ShirbinyS.A. GhalyM.F. El-AyotyY.M. FleafilN.S. 8200728The antialgal activity of 107 Actinomycete isolates were isolated from different localities in El-Sharkia, El-Dakahliya and El-Meniya governorates. Egypt. Isolate No. 40 (isolated from Ekhtab. Aga, Dakahliya) was selected and identified as Streptomyces endus N40. The optimum culture conditions for the production of the antialgal metabolite were studied. It has been found that the optimum incubation temperature for the production of the antialgal metabolite from Streptomyces endus N40 was 28°C after incubation period (8 days) at pH 6.5. The most favorable carbon, nitrogen, phosphorus, microelement and vitamin sources were maltose (6 g L-1), asparagine (1.486 g L-1), K2HPO4 (I g L-1), FeSO4.7H2O (0.01 g L-1) and (inositol) (0.01 mg L-1), respectively. 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