الفهرس 
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Abstract
Thirty five Gram-positive and Gram-negative were collected from Botany department in faculty of Science and department of Microbiology in faculty of Medicine. The susceptibility of these isolates to five plant extracts (allchemilla, clove, origanum, cymbopogon, thyme and lupine) by using agar diffusion method was tested. All bacterial isolates were susceptibility to all concentrations of plants ethanol extract except lupine ethanol extract. Isolates gave different susceptibility to different solvent of plants. Also the susceptibility of isolates to water plants extract varied in inhibition zone diameter. The most sensitive isolates were reexamined to determine RF value of these bacteria with plants extracts. The most potent isolate was selected and identified using Bergey,s Manual of Determinative Bacteriology and Biolog Microlog 34.20 system as Staph.aureus, Salmonella typhi, Bacillus thuringiensis and Bacillus cereus. The minimum inhibitory concentration (MIC) of plant extract was from 10 to 30 according to plant extract against Staph.aureus, Salmonella typhi, Bacillus thuringiensis and Bacillus cereus using agar dilution method. The results also showed plant ethanol extracts (clove, allchemilla, origanum and thyme) decreased the amount of protein nitrogen compared with control these mean that, the plant ethanol extracts had antibacterial activity against bacterial isolates. Also different phytochemical chemicals components of plants, saponins, alkaloids, glycosides, tannins, flavonoids and phenols affected susceptibility of Staph.aureus, Salmonella typhi, Bacillus thuringiensis and Bacillus cereus.