JOURNAL OF
CULTURE COLLECTIONS
Volume 5, 2006-2007, pp.
25-34
TAXONOMICAL
STUDIES ON CERTAIN STREPTOMYCETES
EXHIBITING ANTIMICROBIAL ACTIVITY ISOLATED
FROM
EGYPTIAN SOILS
Hala M.
Rifaat*, Nadia H. Abd El Naser, Samia M. Helmy and Amal M. Ali
Microbial
Chemistry Department, National Research Centre,
*Corresponding author, e-mail: halamohamed6@hotmail.com
Summary
The easy
access and appropriate use of antimicrobials led to selection and spread of
resistant microorganisms strains. It is imperative to search and screen for new
and more effective antimicrobials from microorganisms found in the environment.
The objective of this work is to isolate streptomycetes from soil of Kalubiya
Governorate in order to screen them for antimicrobial activity against
reference Gram-positive, Gram-negative bacteria as well as unicellular and
filamentous fungi. A total of 500 strains of streptomycetes were isolated.
Sixty strains (12 %) showed antimicrobial activity. The morphological,
cultural, physiological and biochemical characters were studied for
identification of the isolates at species level. The obtained results revealed
that the dominant group was Streptomyces
lydicus.
Key words:
agriculture soil, antimicrobial activity,