الفهرس 
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Abstract
coastal regions of North Delta, Egypt.
2-Screening of marine actinomycetes for antimicrobial activities
During primary and secondary screening, thirteen isolates showed antimicrobial activities against some bacteria. Seven isolates exhibited the largest spectrum of inhibitions.
3-Characterization and identification of the most potential isolates
4- Factors affecting the antimicrobial activity of the most active three Streptomyces isolates.
5-Extraction, purification and characterization of the bioactive metabolites of Streptomyces viridiviolaceus EGRB6 by using column chromatography and TLC. Identification of antimicrobial compound was done by using (GC/MS) that detected forty three compounds. Twenty five out of these forty three compounds were previously detected as bioactive materials according to the literature.