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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.
Explain Animal sources of Novel Sources of Natural Colourants The most common animal pigments of use as food colourants are those based on the haem structure. In nature, ha
What are the main events of the third mitotic period? The third mitotic period is anaphase. In anaphase the following events happen: duplication and breaking of centromeres wi
Explain the factors that led to the decline of Science in Europe during iron age
Mixed Tricuspid Stenosis and Regurgitation: Rheumatic involvement of the tricuspid valve is often seen in association with involvement of mitral and rarely aortic valve. Isolated
"Diversity is good" is one of the axioms of conservation biology. However in absentia of historical information, why is noting higher diversity in a system NOT the best way to eval
Explain Deteriorative changes in fats and oils The food products undergo changes in flavour due to the chemical changes occurring in fats and oils present in them. The causativ
newer trends of animal taxonomy
A calico female has a litter of kitten which includes several calico females a yellow male a couple of yellow females and two black males what is the likely color of the father and
The destruction of the ozone layer may be responsible for an increase in
Mesophytes These plants grow in moist habitats and well-aerated soils. They prefer soil and air of moderate humidity but fail to swive in areas with water-logged soils or oveta
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