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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.
Why is complementary base pairing important in DNA structure? Complementary base pairing is important because the hydrogen bonds between the bases hold the two strands of DNA
Formation of Notochord and Somites The formation of notochord and somites from the transplanted dorsal lip was supposed; these are normally derived from cells of the dorsal li
Circulatory Assist Devices : Intra aortic balloon pump (IAUP) was introduced by Kantrowitz (19hX). It is also known as Counter pulsation or Diastolic augmentation.
Q. What is myocardial infarction? The Myocardial infarction is the condition in which an area of this tissue or the entire heart muscle dies by hypoxia due to lack of blood irr
How can the binding of two amino acids for the peptide formation be described? A peptide is formed when a carbon from the carboxyl group of one amino acid is linked to the nitr
What is Risk scoring ? Risk scoring is an instrument to assess both the relative risk as well as the absolute risk of developing Cardio-vascular disease and mortality in an ind
How are gases exchanged in sponges? The gas exchange in sponges occurs by diffusion from the external to the cells that absorb molecular oxygen and release carbon dioxide.
R E TIN A - It is inverted. Innermost, sensitive layer. The part of ratina which is attached to choroid is pars optica. The part of retina attached to cilliary b
EVIDENCES OF EVOLUTION - The evidences of organic evolution derived from many lines of study indicate that present day forms have arisen by gradual changes from pre existing fo
Functions of Ovary The ovary of vertebrates performs the following functions: Production of eggs, Synthesis of hormones needed for the chemical coordination of repr
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