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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.
Make a detailed study on Phylum Protozoa taking an example with clear labeled diagrams.
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Excretion in Non-Chordates Excretion as described under Introduction of this unit refers to removal of the waste products of metabolism - carbon dioxide (CO 2 ) and water rele
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Q. Predominant feature of steatorrhoea? A predominant feature is delayed and defective absorption of fat, which results in bulky stools containing large quantities of fat (know
What's the difference between theory and hypothesis and explain the importance for a hypothesis to be testable and falsifiable in order for the scientific method to be applied?
Vitamins necessity Vitamins are essential organic substances. They are micro nutrients and required in small quantities. They do not produce any energy by themselves.
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