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Effect of Temperature
Certain plants such as the winter rye (Secale cereale) and the biennial strain of henbane (Hyoscyamus Niger) require exposure to low temperature conditions before they start flowering. A phenomenon known as 'vernalization' or 'Yaronization' was noted by the Russian Plant physiologist Gustav Gussner in 1915. Here also embryo or shoot apex seems to be the site of perception and the role of a hormone 'Vernalin" is suggested. Unfortunately like florigen, vernalin has been still elusive. Gibberellin treatment is known to substitute for cold treatment.
Minerals :- Sulfur Food Source Widely distributed Nutritional Functional role Essential nutrient: A constituent of the essential amino acids methionine and
Explain Complex or Undefined Media? Here, the exact composition of the medium is not known. It contains some complex components of plant and animal extracts whose exact chemica
cephalization
Hygroscopic Coeflicient To have a more complete picture of soil moisture relations, let us take a soil sample and oven dry it for 24 hours at 11 o C. Now if this soil is kept i
How can an organism that once underwent contact with an antigen be immunized against future infections by the same agent? This phenomenon is known as immune memory . When an a
How Campylobacteriosis is caused It is caused by Campylobacter jejuni, a Gram-negative rod. It is a microaerophillic organism, which means it has a requirement for reduced lev
Give the results of DistaE Dissection ? Results : For acute dissection of different parts of aorta, the mortality is reported as 9 to 33 per cent. In the International Regis
Question 1 What is standard operating procedure manual (SOP)? Do you think it is important to maintain SOPs in all the laboratories? List the advantages of maintaining SOPs in
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Cold Chain System Vaccines are sensitive to heat. On exposure to heat their potency is lost. Once a vaccine has lost its potency it cannot be regained, so it is important
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