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Nitrates and nitrites: These are added as preservatives to particularly meat products like ham, bacon and pickled meat. They are especially effective against bacteria like Clostridium botulinum and Staphylococcus aureus which have a long history of causing lethal food poisoning. Its preservative action is mainly due to the formation of nitric acid and other oxides of nitrogen and their action increases with decreasing pH value. Nitrates are more effective when they are used in combination with common salt. The presence of nitrites imparts the characteristic pink color to meat apart from protecting its flavor. It also delays the development of off-flavors during storage. Note, nitrates and nitrites are, -however, not permitted to be added to any infant food.
what is a vaso-constriction? what are the effects of vaso-constriction in the skin?
Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition? Epithelia are not vascularized (ca
Draw a section of the microscopic structure of human retina and label any six parts in it. a) Name the structure that determines the eye colour in humans. What is the normal f
Shape and size of protiens Fibrous proteins for example: keratin in hair, actin and myosin in muscles, and collagen. Globular proteins, for example enzymes and antibo
How would you prepare 90 ml of .01 M potassium dichromate dissolved in water? Molecular mass of potassium dichromate is 294 g/mol.
Aspect of Tolerance and Dependence: Drug-abusers are said to be psychologically dependent upon certain drugs. Drugs also induce clear physical dependence in the chronic users.
Transport system in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. It p
Q. Outbreak of Staphylococcal food poisoning? Conditions necessary for outbreak of Staphylococcal food poisoning: • Presence of viable staphylococcal bacteria in the food
Ringworms (cutaneous mycoses) Cutaneous mycoses – also called dermatomycoses, occur worldwide and represent the most common fungal diseases in humans. The dermatophytes are th
Do all genetic diseases result from alteration in the number of chromosomes of the cells? Besides aneuploidies there are other genetic diseases, other chromosomal abnormalities
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