Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Explain Methods of Protein Estimation? Several methods for protein estimation are available. These methods are based on several analytical characteristics of the protein. Labor
Describe Fourth Heart Sound in details? S 4 is generated during the atrial-filling phase. It is a low frequency event. LVS, is best heard over apex. Mechanism of S 4 generat
What are likely to be (a) the coldest, (b) the warmest parts of the body? The extremities of the body (hands and fingers, feet and toes, ears and nose) are likely to be the col
Explain the term Kwashiorkor? The term Kwashiorkor means the 'disease the first child gets when the second baby is born', that is, 'the sickness of the deposed child'. Thus, th
What is Active Transport--Secretion This method is now a well accepted process of aqueous formation. The rate of aqueous humour formation depends on the rate of active solute
Sulphur Cycle - Nutrient Cycles The sulphur cycle is mostly sedimentary except for a short gaseous phase. The large reservoir of sulphur is in the soil and sediment where it i
Q. What are the two kind of fermentation? What are their complete chemical equations? The two major types of fermentation are alcoholic fermentation and lactic fermentation.
Q. What are the conditions favouring the outbreak of Staphylococcal food poisoning? • Botulism is caused by the bacteria Clostridium botulinum. • All low acid foods can s
Consider the following four statements (a - d) regarding kidney transplant and select the two correct ones out of these. 1. Even if a kidney transplant is proper the recipient m
why is virus an exception of cell theory
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd