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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.
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what is direct and indirect external respiration
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Define the Over nutrition obesity of Infant? An infant is never put on a reducing diet. The chances of obesity are least if an infant is exclusively breast-fed till 6 months. I
define alimentary canal
Individuals of the following genotype are crossed: aa BB Cc Dd (crossed with) Aa Bb Cc Dd A) How many different phenotypes are possible for the progeny? B) What are the chanc
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Dosage and administration Menactra is given as a single intramuscular injection. The need for and timing of booster doses is unknown. An unpublished study summarized in the p
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