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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.
Ammonification Many heterotrophic bacteria actinomycetes and fungi in soil and water metabolise the organic nitrogen and release it in an inorganic form as ammonia. This proce
Q. What do you know about Cardiothoracic ratio? The cardiothoracic ratio (CTR) shown in figure is the transverse cardiac diameter (the horizontal distance between the most righ
Determine the function of human body system Human body has different systems to perform different functions. A system consists of organs to perform a particular set of function
First Stage of Invagination The large endodermal cells that are remaining in the vegetal plate move laterally towards the centre of the plate and fill the gap in the vegetal
Define Methods for Estimation of Iron and Haemoglobin? In this section we shall study the procedure involved in estimation of iron in any sample first followed by a review on t
Phases of Respiration in Animals The procedures of respiration in these animals have the following phases. i) External respiration is usually described as breathing. It inv
Q. What do you mean by syphilis? The Syphilis, as well known as lues, is a disease caused by the bacteria Treponema pallidum. Before the invention of penicillin, syphilis was a
Cumulative Interceptive Supportive Therapy (ITI Consensus report) Systematic and continuous monitoring of the periimplant tissue conditions is recommended for the diagnosis of
Eucaryotic Cell Organelles A eucaryotic cell has excessive foldings of intrace!:u:;ir cembrane as compared to procaryotic cell. The eucaryotic cell has a number of'organelles s
Q. Finding the Problem by communication process? - Open up the patient with general talk. - Initiate topic easy to talk. - Ask simple questions easily understood. - As
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