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Register a new userDetection and antimicrobial susceptibility of E.coli O157: H7 in raw bovine milk, some of dairy products and water samples
تحديد الايشريشيا المعوية النزفية H7:O157 coli.E في عينات من الحليب البقري الخام و بعض المنتجات اللبنية و الماء و حساسيتها للمضادات الميكروبية
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جمعت 294 عينة من الحليب البقري الخام غير المبستر، و تشكيلة من المنتجات اللبنية (جبنة قاسية، و حلاوة بالجبن، و جبنة بالقشطة، و قشطة) بدءاً من الأسواق المحلية في مدينة اللاذقية، بالإضافة إلى 44 عينة من ماء التحضير (ماء نقي صالح للشرب جمع قبل أن يستخدم في تحضير الجبنة القاسية) و مـاء الحفظ (ماء عكر جمع من علب حفظ الجبنة القاسية)، حلِّلت العينات للتحري و الكشف عن وجـود coli.E O157:H7.
A total of 294 samples of raw-unpasteurized bovine milk and variety of dairy products (hard cheese, sweet cheese, cream cheese and cream), were collected from local markets in Lattakia city as well as 44 samples of used water (clear potable water collected before used in cheese preparing processes) and preserving water (turbid water collected from hard cheese preserving tanks). All samples were analyzed for E.coli O157: H7 detection.
References used
Arocha, M.M., McVey, M., Loder, S.D., Rupnow, J.H. and Bullerman, L.1992. Behaviour of hemorrhagic Escherichia coli O157:H7 during the manufacture of cottage cheese. Journal of Food Protection 55, 379-381
Borczyk, A. A., Karmali, M. A., Lior, H. and Duncan, L. M. C. 1987. Bovine reservoir for verotoxin-producing Escherichia coli O157:H7. Lancet i: 98
Chapman, P. A., Wright, D. J. and Higgins, R. 1993. Untreated milk as a source of verotoxiginic E.coli O157.Veterinary Record 133, 171-172
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Three hundreds and thirty samples of raw milk and some of the Syrian
dairy products collected during 2002-2003 from different areas of Syria, and
were used to detect the presecne of Listeria in these products.
Results indicated that mainly L. mono
cytogenes and to a lesser degree
L.innocua and L.ivanovii were found in these products. The perecentage of
violating of the Syrian standards was 4 % in raw milk, 0.0% in pasteurized
milk, 2% in white cheese, 0.5% in shinglish and 0.0% in ice cream. And it has
been deterhmined the identity of the isolated bacterial species of Listeria from
the above-mentioned products, where L. monocytogenes was dominant, and to a
lesser estent were L. innocua and L. ivanovii.
The study is based on the cost of milk and marketing margins in dairy
farms in Jordan and estimated cost function. This study is based on a cross
section data from 33 dairy farms. In the study it was determined that the cost of
raw milk production
in dairy farms is 0.43 JD/ Kg. and the most important cost
factors are feed cost, depreciation contributing 64%, 19%, respectively of total
production cost. It was found that marketing margins of milk were 77%,
econometric estimation of raw milk function using different forms showed that
the linear model is superior to the other forms. The elasticity of the estimated
cost function is found to be 0.20.
This research was conducted in the laboratories of Faculty of Agriculture –
Damascus University Department of Food Sciences. The aim of this research
was to study the inhibition effect of the growth and activity of Lactic acid
bacteria as starter
in yoghourt, on the growth of E. coli O157:H7 bacteria. A
pure strains of E. coli O157:H7 and Lactic acid bacteria was used for this study.
The effect of Lactic acid bacteria (Streptococcus thermophilus and
Lactobacillus bulgaricus ) in the number of E. coli O157:H7 was studied in 37 ◦C
and 4◦C. The Lactic acid bacteria was inoculeted in milk which was prepared to
manufacture the yoghurt. The number of E. coli O157:H7 was gradually
decreased with the time. The decline number of this bacteria was clear when S.
thermophilus and Lb. bulgaricus were used as a mixture starter , then when Lb.
bulgaricus was used as a single starter then S. thermophilus was used a single,
In the other hand, the inhibition effect was weaker at 37 C and stronger on 4 C.
In this study, the concentration of Pb and Cd was determined in some agricultural
products in order to compare this concentration and to know the capacity of these products
to accumulate these two elements. The samples were digested by nitric acid
and the
elements were determined by the atomic absorption spectroscopy. The results showed that
the concentration of lead and cadmium in protected products was less than the
concentration in unprotected products, and the concentration of lead was more than the
cadmium, these results can be explained by the extensive use of lead and the unprotected
agriculture products were exposed to the air pollution more than the protected products.
أجري هذا البحث في مخابر كلية الزراعة بجامعة الفرات قسم علوم الأغذية وفي مخابر هيئة الطاقة الذرية بدمشق وقد هدف إلى عزل وتعريف بعض سلالات بكتريا حمض اللبن من الحليب الخام للنوق والماعز الشامي بالإضافة إلى دراسة بعض الخصائص الكيميائية والتصنيعية للسلالات المعزولة وذلك في عامي ( 2010و 2011)
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