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EtiologyThe infectious agent of psittacosis - lymphogranuloma venerum trachoma group (PLVG) is an obligate intracellular parasite and is classified as separate genera with only 2 species, viz. Chlamydia trachomatis and Chlamydia psittacii. These organisms are the members of an exclusive order Chlamydiales under the family Chlamydiaceae. The organism resembles bacteria in the composition of the cell wall, as it possesses both RNA and DNA and also multiply by binary fission. However, unlike bacteria, this multiplication occurs only within the host cells. In this respect, like viruses the organism is intracellular and can only be propagated or multiply in living cells. The elementary bodies of chlamydia stain with basic dyes and are visible as small, round red coloured dots with the light microscope when stained by the methods of Machiavello or Gimenez or modified acid-fast techniques. Their colour is purple blue in Giemenez stained preparations and appear Gram negative in Gram’s stained preparations.
E c h o c a r d i og r ap h y : It is an exceptionally useful technique for diagnosing cardiovascular diseases, particularly in small an
Differentiate between spread plating and streaking?
Functions of Stomata The cuticle forms outermost surface of the leaf and offers resistance to the evaporation of water vapour and entry of carbon dioxide necessary for photosy
Define Factors Affecting Energy Expenditure and Requirement? As mentioned earlier, the energy needs vary widely among individuals in a group. Why? A number of factors cause the
Assume that the blood volume of a rabbit is 0.5 liters. If the effective dose of the anesthetic urethane is 10 µgrams/ml of blood, calculate the volume of a 25% urethane solution t
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Q. Are protozoans presenting pulsatile or contractile vacuoles easily found in fresh or in salt water? Fresh water is the less concentrated of solutes than sea water and it fre
Q. What is the role of the ozone layer for living beings? The Ozone, O3, is a gas of the atmosphere that filters ultraviolet radiation from the sun disallowing most of that rad
Q. What are zoonoses? What are few examples of zoonoses transmitted by birds? Zoonoses are human diseases transmitted by animals. Psittacosis, a bacterial disease, cryptococcos
EIA suffers from following limitations: (i) ELA should be undertaken at the policy and planning level rather than at the project level. (ii) Range of possible alternati
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