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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.
Q. Describe Ecological phytosociological? Field studies are desirable for an understanding of the relationship of any group of plants. If it is not possible to study the plants
What is the difference between an ecosystem and a biome?
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conclusion for epithelial tissue when finish experiment?
Model Analysis The study casts of the patient provide a wealth of information and insight into the treatment decisions and planning. For partially edentulous patients it is cri
Natural versus Artificial (Man-made) Environment The environments discussed so far are, natural environments. In several instances man has greatly altered the natural condition
How is the large size of some cephalopods related to the type of circulatory system they present? In cephalopods the circulatory system is closed and this gives more speed and
Q. Effect on Microbial Growth of pH? Every microorganism has a minimal, a maximal, and an optimal pH for growth. In general, bacteria grow in the pH range of 6.0-8.0, yeasts 4
Explain the factor Chromosomal Inheritance? A huge step forward in our understanding of heredity came in 1902, when a biologist named Walter S. Sutton proposed that Mendel's "f
Q. Is the neural impulse generated by the stimulus that triggers the arch reflex restricted within the neurons of this circuit? This is obvious since the person that received t
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