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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.
Which of the below terms is also called "cancer of the blood" - an uncontrolled, greatly accelerated production of white cells. Is it: a) Leukemia b) Polycythemia c) sick
What are the three main types of passive transport? The three main kinds of passive transport are a) simple diffusion, b) osmosis and c) Facilitated diffusion. C
Determine Guidelines for Planning Balanced Diets for Elderly? The key element in planning diets for the elderly should be nutrient-based dietary guidelines, in order to reduce
Biosphere Biosphere is that part of the earth where life can exist. It is a narfqy layer around the surface of the earth. If you visualise the earth to be the size of an apple
Interactions between minerals Copper deficiency has been identified as a serious problem for grazing ruminants. A deficiency may be due to low concentrations of Cu in forage a
Write short notes on Urine? The concentrated filtrate produced by the kidney is called urine, and is composed mainly of water, urea, toxins, and mineral salts. Urine from the c
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A virus capsid containing vimentin, your protein of interest, gets into the cell nucleus and is broken down with the DNA being released. It is unknown whether the capsids themselve
Explain the Radiographic Failure of Root Canal Treatment It is the persistence or development of pathosis radiographically. Specifically, this is a radiolucent lesion that has
a solution of 5mMol/L CaCl2 is separated from a solution of 1 micromole/L CaCl2 by a membrane that is selectively permeable to Ca+2 but is impermeable to Cl-1 what are the magnitu
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