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Pollen Biology
Fluorescence microscopy coupled with biochemical analysis has helped resolve the differential activity of the enzyme, β-l, 3- glucanase that catalyses the dissolution of callose. The enzyme activity is relatively low during the first meiotic division but reaches its peak at the time of spore release. This sequence of events controlling the enzyme activity is important, as an early dissolution of callose may lead to sterility. Use of autoradiographic and fluorochromatic techniques demonstrated the reduced permeability of the callose wall and the resultant chemical isolation of microspores.
A combination of phase-contrast and fluorescence microscopy also revealed that the callose wall during exins formation serves as a mold or template. Factors that trigger the onset and regulation of meidsis in anther and ovule can be worked out by employing labeled reagents. Biochemical studies through isoenzyme markers have already demonstrated specific stages of meiotic process. There is an increase in the activity of acid phosphatase at zygotene, followed by subsequent decline. At pachytene, marked activation of endonucleases is recorded. Isoperoxidases serve as markers in normal pollen development in Mercurialis annua.
The entire mechanism of protein synthesis in eukaryotes is generally the same as in prokaryotes, with three phases explained as termination, elongation and initiation. Furthermore,
Organisational Behaviour of Health Care The insights provided by the theories of organisational behaviour emphasise the need for the establishment of institutional frameworks
Circulatory Assist Devices : Intra aortic balloon pump (IAUP) was introduced by Kantrowitz (19hX). It is also known as Counter pulsation or Diastolic augmentation.
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Write up your own Matlab program to do the job described by Show">http://www.avatar.se/molbioinfo2001/dynprog/adv_dynamic.html Show a few examples, your code does work. You wil
Define Types of Quantitative Analyses in Nutritional Biochemistry? Methods of quantitative analysis broadly there are two types of quantitative analyses: (a) Gravimetric,
K e to s i s It is also known as acetonemia in bovines or pregnancy toxaemia in sheep and is associated with ketonemia, ketonuria and low blood glucose. E t iol
What is a nutrient? A nutrient is it substance used in the metabolism and which is acquired from the diet. Such as, vitamins and necessary amino acids are nutrients.
NASA L CHAMBER - External nares are 2 in number, i.e., dirhynous. Situated at lower side of nose. Open into nasal chamber. Nasal chamber opens into pharynx by internal n
Q. What is the main molecule responsible for the absorption of photic energy for photosynthesis? And where is that molecule located in photosynthetic cells? The chlorophyll mol
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