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Register a new userBacterial Distribution Analysis in the Atmospheric Air of the Primary and Secondary Schools
تحليل التوزيع البكتيري في الهواء المحيط بالمدارس الابتدائية و الثانوية
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تمت دراسة تحليل التوزيع البكتيري للهواء المحيط داخل الصفوف لست عشرة مدرسة ثانوية وأربع عشرة مدرسة ابتدائية في مدينة إب باليمن للفترة بين فبراير إلى مايو/ ٢٠٠٢ أشارت النتائج إلى أن معدل نسب البكتيريا النامية على وسط الدم المغذي الصلب قد شكلت أعلى التراكيز، و تبعته تلك التي نمت على الوسط المغذي الصلب، و أخيرًا تلك التي نمت على وسط الماكونكي الصلب. كان معدل أعداد البكتيريا النامية على وسط الدم الصلب في الفصول من دون تهوية، و ذات التهوية المتوسطة، و التهوية الجيدة ٢٤٦ ،٢٦٩ ،٤٩٢ وحدة مكونة للمستعمرة/ ٥٠ لترًا من الهواء. أظهرت المدارس الابتدائية تراكيز أعلى للبكتيريا مقارنة بالمدارس الثانوية. كانت أعداد البكتيريا داخل الفصل الدراسي أعلى مما هو عليه في باحة المدرسة. على الرغم من تقارب نسبة الطلاب إلى مساحة الفصل، لوحظ أن أعداد البكتيريا تناسبت عكسيًا مع حجم الفصل.
Bacterial distribution analysis of the atmospheric air of fourteen primary and sixteen secondary school classes at Ibb City in Yemen was performed during the period between February and May, ٢٠٠٢. The results indicated that bacteria grown on the blood agar formed the highest numbers, followed those grown on nutrient agar, and finally on MacConkey agar. The average number of blood agar grown bacteria in nonventilated, semi-ventilated, and well--ventilated school classes were ٤٩٢, ٢٦٩, and ٢٤٦ cfu/٥٠ liters of air sample respectively. Primary schools showed a higher values of bacterial counts, compared to the secondary schools. The concentration of the bacteria inside the school classes was higher than those of school square. Inside the classes, in spite of approximate values of student per unit area, i.e. ٠,٦٤m٢, the total number of bacteria per cubic meter was observed to be inversely proportional with the class volume.
References used
May, K.R. (١٩٦٧). Physical aspects of sampling airborne microbes. In: Gregory, P.H. & Monteith, J.L. (eds). Airborne microbes. ١٧ th Symposium of the Society for General Microbiology. Cambridge University Press, Cambridge
Greenwood, D. Slack, R., & Peutherer, J. (eds) (١٩٩٧). Medical Microbiology, ١٥th edn. Churchill Livingston, Edinburgh
Collee, J.G., Fraser, A.G. Marmion, B.P., & Simmons, A.S. (eds) (١٩٩٦). Practical Medical Microbiology, ١٤th edn. Churchill Livingston, Edinburgh.
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