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One of man's oldest methods of preserving foods is drying or desiccation. The preservation of foods by drying is a direct result of removal of moisture. Microorganisms need water for growth. The exact amount of water needed for growth of microorganisms varies. This water requirement of microorganisms is best expressed in terms of available water or water activity aw, the vapour pressure of the solution (of solutes in water in most foods) divided by the vapour pressure of the solvent (usually water). Thus aw, for pure water would be 1.00. The water activity depends on the number of molecules and ions present in solution, rather than their size. Thus a compound like sodium chloride, which dissociates into two ions in solution, is more effective at reducing the water activity than a compound like sucrose on mole-to-mole basis.
What are examples of the ecological and economic importance of molluscs? Molluscs are significant players in several food chains in ecosystems. Many marine molluscs are part of
Q. What is Pulmonary Veins in Normal Pulmonary Vasculature? The right and left upper lobe or superior pulmonary veins descend lateral to the arteries, cross in front of the hil
Q. What is the second polar body? After termination of the second meiotic division of the oocyte II two cells are generated: the second polar body and the egg cell proper. The
Explain about the Health Economics and Economics of Malnutrition? In the earlier units on nutritional problems, we learnt that there are many causes of malnutrition, socioecono
NEO DARWINISM OR SYNTHETIC THEORY OF EVOLUTION - It is the synthesis of the ideas of Neo Darwinians as a new theory of evolution based upon recent findings of genetics and m
Brucellosis Brucellosis among cattle, buffaloes, sheep, goats, pigs produces heavy economic losses due to abortions in late pregnancy, infertility and reduction in productivit
What is the criterion used to classify hosts as intermediate hosts or as definitive hosts? The criterion used to classify hosts as intermediate hosts or as definitive hosts is
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EXCRETIO N IN ROUNDWORM - In ascaris 4 coelomoducts present, attached to each other by canaliculli in front of controling cell i.e. Rennete cell. Excretion materials are gi
Explain Nephrotic syndrome Nephrotic syndrome :- Kidney disease due to degeneration of renal tubule.
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