Mohamed K. E. Youssef

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BACKGROUND The microbiological condition of beef produced at North American plants has been improved as a result of the use of effective carcass-decontaminating treatments. The effect of these treatments on the storage life of beef has not been established. In this study, beef primal cuts in vacuum packs stored at -1.5 or 2 °C for up to 160 days were(More)
The aim of the study was to determine the effects of meat pH on the abilities of 11 psychrotolerant Clostridium spp. to grow on, and to possibly cause blown pack spoilage of vacuum packaged beef. Beef steaks of pH 5.4-5.6, 5.7-5.9 or ≥6.0, i.e. of normal, intermediate or high pH were prepared and vacuum packaged. Groups of 3 steaks of the same pH range were(More)
The objective of this study was to determine the immediate source of Escherichia coli on beef trimmings produced at a large packing plant by analyzing the E. coli on trimmings at various locations of a combo bin filled on the same day and of bins filled on different days. Ten 2,000-lb (907-kg) combo bins (B1 through B10) of trimmings were obtained from a(More)
Beef steaks (2 cm thick) were each inoculated at three sites in the central plane with Escherichia coli O157:H7 at 5.9 ± 0.3 log CFU per site. Temperatures at steak centers were monitored during cooking on a hot plate or the grill of a gas barbeque. Steaks were cooked in groups of five using the same procedures and cooking each steak to the same(More)
The aim of this study was to determine the course of effects on the microflora on beef carcasses of a commercial dry chilling process in which carcasses were dry chilled for 3 days. Groups of 25 carcasses selected at random were sampled when the chilling process commenced and after the carcasses were chilled for 1, 2, 4, 6, 8, 24, and 67 h for determination(More)
The present study aimed to investigate the effect of two levels of carob powder 10 and 20 % on lipid profile. Forty male Sprague–Dawley rats were divided into two groups. The first group was fed on a basal diet and acts as a control group. The second group was fed on a hyperlipidemic diet (a basal diet plus 10 % animal fat and 1 % cholesterol). After 6(More)
The Carob is the fru it of an evergreen (Ceratonia Siliqua L.) cult ivated in the Mediterranean area. The pulp represents 90% of the fruit. It has a high content of sugars and tannins and low contents of protein and fat. Carob powder or syrup is used as an ingredient in cakes and cookies and chocolate substitute. Carob powder contained high levels of(More)
The possible origin of Escherichia coli found on cuts and trimmings in the breaking facility of a beef packing plant was examined using multiple-locus variable-number tandem repeat analysis. Coliforms and E. coli were enumerated in samples obtained from 160 carcasses that would enter the breaking facility when work commenced and after each of the three(More)
The comparative effect of raw red chili and red chili treated by gamma irradiation or microwave pasteurization with or without 5-fluorouracil on experimentally induced colon cancer in rats was investigated. Dimethylhydrazine was used to induce colon cancer which is histologically similar to and comparable with human neoplasm. Histopathological examination(More)