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.
Trypsin Trypsin is secreted in the inactive form trypsinor - which is converted into the active form trypsin by the enzyme enterokinase secrated by the duodenal mucosa.
In general compare and contrast the three functional classifications of joints according to movement. What are two characteristics that make synovial joints unique and different fr
Describe PS With Atrial Right To Left shunt in details? This group of patients has cyanosis due to light to left shunt at atrial level. The diminution in PA pressure and PBF ma
notochotr is absent in the group ...........
Explain the terminology Niche ? The term niche is used often in ecology, and its meaning has been defined and interpreted in various ways over the years. An organisms niche has
Define Feeding and Nutritional Management for Neuro trauma? The main objective of nutritional management is to counteract the hypermetabolism associated with inflammation. The
Give definitions of atomic number and atomic mass and how they relate to protons, neutrons, and electrons in neutral atoms?
1. By direct measurement of the activity of the thyroid gland in several patients who had received 131 I for diagnostic purposes, it was observed that the biological elimination h
Planning of Nursing Care Provide supportive and symptomatic treatment. Provide bed rest. Encourage diet restriction, Implementation of Nursing Care
Figure shows the flow of energy through the trees in a forest ecosystem.The numbers represent inputs and outputs of energy in kilojoules per m 2 per year. (a) (i) On Figure,
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