الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 282 |  |  |
| | | from | 282 | | |
Abstract
The present thesis aimed at the isolation, characterization, and xonornic identification of Streptomycetes of some soils of Qalubia overnorate, and establishing a culture collection of these Streptomycetes.
Using starch nitrate agar and applying dilution technique 154 Streptornyces isolates were obtained from five soil samples covering the soil types of Qalubia governorate. All isolates proved to be Streptornycetes.
Using the color wheels of Treesner and Backus (1963), the obtained isolates were differentiated into 4 color sections:
1. Yellow section that contains 29 isolates.
2. Red section that contains 26 isolates.
3. Gray section that contains 93 isolates and which were further differentiated into two color subsections:
Subsection (A) of red gray Streptomycetes that contains 66 isolates.
Subsection (B) of light gray Streptomycetes that contains 27 isolates.
4. Blue section that contains 6 isolates.
The isolates were further differentiated into groups according to the color of aerial and substrate mycelium, pigrnentaion, morphology of spore chains, and ornamentation of spores. As a result of this study the experimented isolates were differentiated into 24 groups. Representative isolates were subjected to detailed taxonornic studies as recommended by the newest determinative manuals of Streptomycetes i.e. Bergey’s manual of systematic bacteriology (1989).