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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 is the law of limiting factors? How would the rate of photosynthesis be affected if the soil water becomes limiting? Describe.
What is the positive atom referred to in ionic bonds and write a monovalent and divalent example.
DRUG DEPENDENCE - Some drugs are prescribed by doctor for the prevention or treatment of a disease. Some drugs are used for long periods. A person becomes addict to these
Gifted Species - Biological Nitrogen-Fixation Biological nitrogen fixation remains mainly confined to a few distinct nutritional types of prokaryotes, some of which are free-l
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Q. Define Thrombospondin Polymorphisms Thrombospondin polymorphisms may present an initial insight into our understanding of the genetic contribution to coronary atherosclerosi
uses of conductometry in biological experiments
List the advantages of IOPA and OPG a) Advantages of IOPA are as follows It is a useful high yield modality for ruling out local bone or dental disease It is of value
Explain Chemical Structure of saponins? Let us briefly understand their chemical nature. Their structures are characterized by the presence of a steroid or triterpene group, i.
What is a pipette and how is it used? There are lots of types of pipettes (or pipette), but most are basically a fancier version of a medicine dropper or eye dropper. They are
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