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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.
Define Sporangiophore - Types of Hyphae? Sporangiophore - Tufts of special, erect unbranched, hyphae growing in air arise from stolon just opposite to rhizoids. These are s
What is the phototropism? The Phototropism is the movement of plant structures in response to light. The Phototropism may be negative or positive. The Positive phototropism is
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Differences between Prokaryotes and Eukaryotes It is obvious that there are a number of differences between them. Prokaryotes, like bacterial cells are generally much smaller,
Define Technique of Paper chromatography? Paper chromatography is used as 1. Ascending, 2. Descending or 3. Horizontal technique (circular paper chromatography) It is De
Explain noncompetitive inhibitor A noncompetitive inhibitor can combine with either the free enzyme or the enzyme- substrate complex, interfering both. The most common ty
Draw a diagram of the longitudinal section of a mature anatropous ovule and label any ten parts in it.
Precautions for Morphological Characteristics of Yeast Cells? 1. Observe aseptic conditions. 2. Use only a small sample for staining. 3. No air bubbles should be in the s
Define Fats required for underweight - nutritional care? Fats: We know that fats are concentrated source of energy (lg = 9 Kcals). Fats are capable of increasing the energy val
State in brief about respiration When we breathe in the air, our chest expands and air is taken in the lungs and when we breathe out chest returns to its resting position. This
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