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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.
Illustrate metabolic processes of vitamin B In the human and animal metabolism, they form a functional unit, since, as components of the various coenzymes, they are essential
How is it explained that a person with the spinal cord sectioned at the cervical level is still able to perform the patellar reflex? The arch reflex depends only on the integr
Explain the Composition of Blood Agar? Infusion from beef heart - 500 gm Tryptose - 10.0 gm Sodium Chloride - 5.0 gm Agar - 15 gm Distilled water - 1000 ml pH
Explain the differance between savanna and desert? Savanna : Savanna is characterized by relatively low rainfall and pronounced dry seasons. This type of climate produces a b
Explain Acidic Stains (anionic) - Types of Stains? These are sodium, potassium, calcium or ammonium salts of coloured acids, which on ionization give negatively charged chromog
Compare and contrast the effect of a deletion in the operator of the lactose operon with one in the operator of the histidine operon.
(a)State the law of independent assortment. (b )Using punnett square demonstrate the law of independent assortment in a dihybrid cross including two heterozygous parents.
Stratification - Aquatic ecosystems Aquatic ecosystems also exhibit marked stratification. In lake and ocean ecosystems light penetration, temperature and availability of oxyg
The DNA of a bacterial cell,such as Escherichia coli is a circular double-stranded molecule often referred to as the bacterial chromosome. The circular DNA is packaged into
Explain about the DNA viruses - Carcinogenic? The three DNA viruses found to cause human cancers are EBV, HBV and HPV. What are these? Let us find out. Epstein-Barr viru
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