الفهرس 
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Abstract
Total viable bacteria and total coliform bacteria were isolated from different sources of food (carbohydrates, vegetables and proteins) in Mansoura city. Bacteriological analysis and proteolytic activity were performed for all isolates. Most potent proteolytic species were identified by Bergy and microlog biolog system 34.20, and we had Bacillus cereus, Escherichia coli, Salmonella indica and Staphylococcus aureus. Sensitivity test for this species to 12 antibiotics (Ampicillin, Aztreonam, Cefadroxil, Ceftazidime, Chloramphenicol, Ciprofloxacin, Erythromycin, Imipenem, Neomycin, Norfloxacin, Streptomycin and Vancomycin) was performed. The antibacterial effect of 9 chemical food additives (ascorbic acid, nisine, phloxine B, riboflavin, sodium benzoate, sodium monoglutamate, sodium nitrite, sorbic acid and tartrazine) was studied on species and time kill curves for most potent food additives were detected.We studied the antibacterial effect of six solvents for 15 medicinal plants (Ambrosia maritime, Artemisia cina, Cassia senna, Coffea arabica, Curcuma longa, Cympobogon proximus, Cyperus rotundus, Juniperus oxydrus, Lavandula officinalis, Lepidium sativum, Myristica fragrans, Origanum marjorana, Peganum harmala, Salvia officinalis, and Trachyspermum copticum) and then we studied mixtures and commercial oils of most potent plants (Origanum marjorana, Peganum harmala and Salvia officinalis) against studied bacterial species. The commercial oil of these plants was subjected to (GC-MS). Acute toxicity test of these oils was studied on hamsters as example of mammals.