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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.
Signal Transduction The body consists of a huge variety of cell types which must work together to sustain the life of an organism. They must respond to their environment and co
Illustrate the Applications of Gellan gum Gellan is a highly versatile food ingredient and has numerous applications in foods. The combination of gelatin with gellan, by compar
How are mutagenic agents related to cancer incidence in a population? Is cancer a disease transmitted to the individual offspring? The exposition of a population to mutagenic a
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please i want detailed explanation on the mechanism of enzyme catalysis
Q. What is the heterophagic intracellular digestion and How is this process accomplished? Heterophagic intracellular digestion is the breaking into smaller substances of extern
Which of the following serves as a controlled variable in a negative feedback system? A. Levels of hydrogen ions in the interstitial spaces of the brainstem. B. Blood plasma
Give an example of how a functional group can affect the elements of an organic compound. The hydroxyl group on alcohols is polar and this produces alcohols polar compounds.
Phylum Coelentrat a : (9,000 'species) The body is radial and made up of two cell layers. Gastro-Vascular cavity is saclike, tentacles and stinging cells are present. They may
What is the relationship among environmental resistance and the population growth according to the biotic potential curve and the real population growth curve? The difference
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