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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.
Fowl spirochaetosis The causal agent Borrelia anserina is a spiral-shaped organism about 8-30 um in length but commonly 14-15 um long and 0-3 um wide. The organisms are activel
Human Impact on Carbon Cycle Human activities have greatly influenced the carbon cycle. The discharge of CO 2 , into the atmosphere is steadily increasing owing to burning of
Q. What is population density? The Population density is the relation between the number of individuals of a population and the area or volume they occupy. For instance, in 200
WHAT IS A CELL
Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectively conductive to a newly discovered tetravalent anion n
Explain in detail about working of heart Heart has four chambers. Two upper chambers are called atria. Two muscular lower chambers are called ventricles. The right and left
Explain the effect of Non Nutritional Factors pregnancy? The incidence of LBW is lowest and mean birth weight is highest in the state of Kerala, which is attributed to better
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Occurrence Pantothenic acid Pantothenic acid is a ubiquitous active principle occurring in free as well as in the bound form. In the bound form, pantothenic acid is incorpor
Explain Energy requirement during tuberculosis Energy : The criteria to establish the energy intake is the body weight status coupled with the rise in body temperature. Con
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