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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.
Microevolution is: the change in allele frequency in a population. Cannot occur if genetic equilibrium is reached. Results in the formation of a new species. Is influenced by mutat
Forms of Soil Water Gravitational Water or Ground Water: After a heavy rain or irrigation, much of the water drains or sinks downwards. This is called gravitational water.
For many years, students who have occupied my Molecular Biology course have now applied for lab tech jobs exact after graduation. But I have NEVER had a student fail to obtain a jo
Periimplant Sulcus Fluid Analysis (PISF) This is not a parameter for clinical use but for experimental situations. However, it is important for us to know about it. Several bio
what year did virchow state where a cell exists there must have been a pre-existing cell
who discovered it? and what is it''s physiologic functions?
What is the critical photoperiod? How can the critical photoperiod relate to flowering be experimentally determined? The critical photoperiod is the limit of the photoperiod du
Q. What is Phenylketonuria? The essential amino acid phenylketonuria is utilized for tissue protein synthesis and hydroxylated to form tyrosine. The hydroxylation reaction requ
Osmotic Strength of the Fluids in Immediate Surrounding The availability of soluble mineral salts varies widely from habitat to habitat. In fact, a big chunk of land in our
Determine the categories of sleep disorders Sleep disorders are generally divided into two major groups: 1) Narcolepsy, which is characterised by excessive sleep or brief in
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