الفهرس 
The bacterial content of benthic layersOnly 14 pages are availabe for public view
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Abstract
Lake Qdn is a unique inland Lake located in the lowest part of the depression of El-Fdyiim Governorate about 80 km SW of Cairo between longitude 30” 25’ and 30” 50’ E and latitude 29” 25’ and 29” 30’ .It extends for about 40 km from east to west, with a mean breadth of 5.7 km, its maximum depth is about 8.5 m with an average 4.2 m. The Lake receives drainage water from neibouring cultivated lands through a system of drains, mainly El-Batts and El-Wadi Drains, in addition to twelve small drains. This water is originally agricultural drainage water carryitlg other types of wastes and potentially hazardous compounds. The present work aims to study and follow-up the different types of bacteria that are indicative or are sensitive to the harmful effects of the hazards transported by this water in the context of various physicochemical parameters as summerised in the following: * The total bacterial numbers at both 22OC (for aerobic and facultative) and at 37OC * Faecal streptococci as indicator of faecal contamination. * Bacteria participating in nitrogen, carbon and sulphur geochemical cycles because of their importance in the food chain of the aquatic environment:. - Anaerobic non-symbio tic nitrogen-fixing clostridia, nitrrfylng bacteria and denitn&ing bacteria of the nitrogen cycle. - Anaerobic cellulose-decomposing bacteria of the C-cycle and - sulphate-reducing bacteria of sulphur cycle.