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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 processes results in the most ATP production within a cell?
(a) What are the two main pollutants that contribute to acid rain? (b) Where do these pollutants come from? (c) What direct or indirect effect is 'acid rain
taxonomy of phylum echinodermata
State the concept of Finger Tapping The subject is asked to tap his or her extended index finger on a typewriter key attached to a mechanical counter. Several series of 10-seco
Mechanics of Locomotion Among annelids, polychaetes, hence more primitive than the other two groups, show a more complex mode of locomotion. Necessarily, the locomotion in po
A species has a diploid chromosome number of 56, WHY is it true that of the 28 chromosomes in an ovum, 14 are always paternal?
Sericulture : This is related to silk worms. Sericulture is also known as silk farming. Sericulture is rearing of silkworms for the production of raw silk. There are many types of
Benefits of Hand washing You wash hands as a routine in daily life before cooking and eating food, after using wash room/toilet, before touching and caring a new born baby, aft
Production of Industrial Compounds Cultured plant cells retain their metabolic potential and synthesise secondary products of commerce. Cell cultures can also be used as facto
What is the difference among essential and natural amino acids? Essential amino acids are those that the organism is not able to synthesize and that require to be ingested by t
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