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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.
A study is made to verify the effects of pesticide exposure on pupal weight of butterflies. In a pilot study, 5 randomly selected larvae are raised on plants exposed to the pestici
Microtubule assembly: A) generally originates in the centrosome. B) occurs only during mitosis. C) occurs randomly throughout the cell. D) is regulated by myosin. E) is inhibited d
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Define the Essentiality of Carbon for the Growth of Microorganisms Carbon is needed for the skeleton of all organic molecules. Microorganisms acquire it either as inorganic car
The client was admitted to the hospital with hypertension (high blood pressure). The development of arteriosclerosis (plaque buildup in the arteries) has increased peripheral resis
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Define Water Distribution and Compartments of Body Water? Each one of us has a veritable 'sea within', held in place by multiple membranes and our protective envelope of skin.
Define the Concept of Health - Public Nutrition? The most widely accepted definition of health is the one given by WHO (1948) in the preamble to its constitution, Box 1 gives t
Q. What is Dietary fibre? Dietary fibre is defined as plant polysaccharide resistant to hydrolysis by the digestive enzymes in the human intestinal tract. It includes: • Str
Define about the Pancreatic Cancer? This is a condition often associated with abdominal pain, anorexia, nausea, and vomiting and weight loss. Ealing may aggravate pain. There m
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