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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 Chemically Defined or Synthetic Media - Culture Media? Synthetic media are those media where detailed composition of the medium is known in terms of the chemical nature
How can we control the disease Cholera Control: Individuals infected with cholera require oral rehydration therapy with NaCl plus sucrose, sodium bicarbonate and potassium ch
Carbohydrate - contains Carbon , Hydrogen , and Oxygen with a general formula of C x (H 2 O) y Simple sugars à monosaccharides Oligosaccharide à sugars containing
Explain about the Biofertilizers Biofertilizers, are the cultures of microorganisms used for inoculating seed or soil or both under ideal conditions to increase the availabilit
Q. What are the etiological agents of malaria? The etiological agents of malaria are protozoans of the genus Plasmodium. There are four different kinds of plasmodia that cause
Determine in brief about the Classic migraine This is probably the most interesting form, occurring in about 12% of migraine sufferers, because it begins with an aura, which us
Q. Standard invert sugar solution? Reagents Required 1) Standard invert sugar solution: Weigh accurately 0.985 g of sucrose and dissolve in 500 ml of water. Add 2 ml of
Why is it more probable that the photosynthetic prokaryotes appeared before the aerobic eukaryotes? It is more feasible that photosynthetic prokaryotes appeared before the aero
ASSISTING IN PROCEDURE OF BIOPSY Biopsies are removal of a small piece of tissue for examination under microscope. Such examinations are called hist to pathological examina
Trout beck zone - Lotic Ecosystem This is larger and more constant than the head stream. The greater volume of torrential water carves channels into exposed rock floor (bed ro
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