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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.
Wetlands and estuaries are transitional biomes. Land that remains flooded either part of the year or permanently with fresh or salt water is known as wetland. The internationally a
TRACHE A - It is a thin walled tube. Situated on ventral side. Commonly known as wind pipe. Supported by C-shaped cartilagenous rings. Incomplete dorsally due to oesopha
PLACENTA - A common tissue of foetus & mother (uterus) which is physical, physiological & endocrinal connection is known as placenta. FUNCTIO N - To provide nutrients
Q. Differentiate between adult and infant botulism? • Adult Botulism is prevalent amongst adults whereas Infant Botulism is prevalent in infants of less than one year of age.
M e thods of gene transfer The technology employed for introduction of transgenes into a livestock population may produce consequences specific to the method. Once introduced
main branches of biology
What capacity does the brain have to repair itself after injury or disease? It has long been accepted dogma that central nervous system doesn't regenerate itself after traumati
Digestive system of human
illustrate vernalisation?
If you inoculate an organism know to chemically reduce sulfur (as done by organisms capable of anaerobic respiration), where would you expect to see its growth in the test medium u
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