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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.
Blastula is the ball of cells surrounding a fluid-filled cavity (known as blastocoel) which is produced by the cleavage of a zygote.
Myelinated fibre Axon is a relatively long process (also quite often referred to as nerve fibre) and can be considered as functionally specialised for conduction of excitation
right classification of protozoa up to class
Q. What is the difference between the exocrine gland and the endocrine gland? Endocrine gland is a gland whose secretions are called as hormones that are collected by the blood
Megaloblastic Anaemia Megaloblastic anaemia refers to the abnormal development of red cells i.e. megaloblasts in the bone marrow. Etiology It is due to lack of f
what is the excitation threshold of a neuron?how does this threshold relate to the all or nothing rule of neural transmission
Explain in brief about the ciliary muscle During accommodation the ciliary muscle contracts and in turn the size of the ciliary ring is reduced. This results in the suspensory
a) Why are grasshopper and Drosophila said to show male heterogamity? Describe. b) Define female heterogamity with the help of an example.
Equipment : To maintain effective circulation and carry out functions of the lungs during an open heart operation the equipment should have: 1) Blood Pump 2) Oxygenator 3
Dosage and administration Menactra is given as a single intramuscular injection. The need for and timing of booster doses is unknown. An unpublished study summarized in the p
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