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Explain the Physical Methods to Control Microorganisms?
The physical methods to control microorganisms involve heat, filtration or radiations. Figure illustrates these methods. Temperature influences microorganisms by altering their enzyme systems. Low temperature, you may recall studying in the theory Course, inactivates the enzymes while high temperature destroys them. Heat is commonly employed for controlling microorganisms. Both moist heat and dry heat can be used for this purpose. Moist heat results in coagulation of proteins and degrades nucleic acid and may even disrupt cell membrane.
Moist heat has more penetrability than dry heat and kills the cells more rapidly that too at a lower temperature. Microbes exhibit difference in their resistance to moist heat. Generally, bacterial spores require temperature above 100°C for destruction. Moist heat can either sterilize or disinfect the object depending upon the temperature employed. Moist heat can be used either
(1) at temperature <100° C (pasteurization-used to remove pathogens),
(2) as free flowing steam at 100° C (by boiling or tyndallisation) or
(3) by saturated steam under pressure (autoclaving).
Systems of Human Body Many organs work in a coordinated'manner to form a system. For example in our-body the nose, the trachea and the lungs form the respiratory system. Table
Q. Generally which phase of the cell cycle has longer duration? The mitotic phase has quite a shorter length and the interphase comprises approximately 4/5 of the cell cycle.
differnce between protonephridia and metanephridia
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Define reagents required and methodology for Benedict Test? Reagents Required - Sugar solutions of glucose, fructose, galactose, maltose, lactiose, sucrose and starch.
MORPHOLOGICAL AND ANATOMICAL EVIDENCES - (i ) HOMOLOGOUS ORGANS - The organs apparently similar or dissimilar in structure and function, but of similar embryonic origi
What''s the classification of simple protein?
In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony" are inherited at independent loci and are recessive to their dominant wild-typ
Bacterial food poisoning Food poisoning is an acute gastro-enteritis or intestinal disorder resulting from the ingestion of foods contaminated with either living microorganism
What is Imbibition The ability of colloids to pick up water and swell when they come in contact with water is called imbibition. Imbibition is usually accompanied by the evo
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