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Staphylococci exist in air, dust, sewage, water, milk and food or on food equipment, environmental surfaces, humans and animals. Humans and animals are the primary reservoirs. Staphylococci are present in the nasal passages and throats and on the hair and skin of 50 percent or more of healthy individuals. A wide range of foods maybe involved in Staphylococcal food poisoning including ham, turkey, chicken and chicken salad, baked products, especially filled pastries, table ready-meats (sausage etc.), precooked frozen foods and dairy products.
S. aureus cells are relatively more resistant than many gram negative food spoilage organisms. Human intoxication is caused by ingesting enterotoxins produced in food by strains of S. aureus, usually because the food has not been kept hot enough (60ºC, or above) or cold enough (7.2ºC, or below). In frozen foods they may survive even at -10ºC. In general, survival of S. aureus is best in foods that contain high concentration of sugars, eggs and buffering component such as phosphates and protein. Salt concentration less than 9.5%, temperature more than 20ºC and a pH in the range 6-8 are favourable for growth and enterotoxin formation.
Bomb calorimeter is used to determine the calorific value of solid and liquid fuels. Construction It consists of following parts 1. Stainless steel bomb:
What are the hormones produced by the testicles and the ovaries? The testicles make androgenic hormones, the major of them being testosterone. The ovaries make estrogen and pro
Results of Monohybrid Crosses Mendel got the following results from his monohybrid crosses :- 1. F 1 plants produced by a cross between two plants pure for the cont
CUTIN It is a lipid formed by polymerization and cross-esterification of hydroxy fatty acids. Cutin occurs inside outer epidermal walls of plant surfaces as bringing agent t
evolutionary effect of Oracle clinical applications in Pharmaceutical industries
Q. What are NADPH and NADP? NADP is the short form of the nicotinamide adenine dinucleotide phosphate cation, a hydrogen acceptor. NADPH is made when NADP binds to one hydrogen
Q. Describe Infection control sterilization protocol? Today is the age of modern technology coupled with medical challenges. Pervasive increase in serious transmissible disease
WHAT ARE THE BRANCHES AND CONCEPT OF APPLIED BIOLOGY
Define Reagents for Estimation of Calcium Using EDTA Titrimetric Method? 1. Buffer solution: Dissolve 16.9 g NH 4 CI in 143 ml NH 4 OH. To this add 50 ml of solution containing
Q. Which are the organs of the excretory system? The excretory system is formed of ureters (two), kidneys (two), bladder and urethra.
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