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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 Procedure for the use of Light Microscope? Now carry out the exercise following the steps enumerated herewith. 1. Place the microscopic slide with any specimen on th
Tumor Suppressor Genes Tumor suppressor genes or anti-oncogenes generally inhibit cell division in cooperation with proto-oncogenes. The very existence of these genes prevent
what is biological sickness of soil and its management
Q. Why is the cerebellum more developed in mammals that fly or jump? The cerebellum is the main brain structure that coordinates the movement and the equilibrium of the body. F
Define effect of Minerals on athletes? Mineral supplementation, particularly iron in cases of iron deficient athletes is beneficial. Similarly, magnesium and chromium supplemen
Tissue Level - Level of body organization As you know a tissue is a group of cells similar in origin and structure that perform a specific function. The next level, is the tis
How does the plant cell wall react when it is placed under hypotonic medium? Ans) The plant cell wall (the covering of the cell outside to the cell membrane) is made of cellulos
Three charges are at the corners of an equilateral triangle, as shown in the figure below. Calculate the electric field at a point midway between the two charges on the x-axis. (Le
Issues Impacting Health and Development Poverty and malnutrition are the leading causes of high maternal and child mortality rates in developing countries. Together, they seri
A cyclic hemiacetal with a six-membered oxygen-containing ring is referred to as a(n): Select one: a. aldehyde. b. pyranose. c. ketopentose. d. furanose. e. sorbi
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