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.
Q. Explain Spoilage by fungi and bacteria? The dominant spoilage organisms in fruits are fungi, as their pH is low (normally 5),whereas the pH of vegetables is fiom 5.0 to 7
Indications for Coronary Artery Bypass Surgery : The modalities of treatment for coronary artery disease iuc: (1) medical, (2) angioplasty and stenting, and (3) coronary arte
Which of the following BEST characterizes gas exchange in animal versus plant metabolism: Animals take in O2 and release CO2. Plants take in and release both O2 and CO2. Both anima
biology ofr this
Define the Nutritional Assessment Tools? Malnutrition/protein energy malnutrition amongst elderly persons has been observed in various studies -be it hospitalized patients, nur
Define the term- Ultrafiltration Ultrafiltration occurs when the flow of a substance across a cell membrane is increased by a hydrostatic pressure. This process was initially b
which animal have most developed mandible
Which of the following does NOT contain a guanidinium group Select one: a. Urea b. arginine c. creatine d. guanidinium ion
Define Formula Concentration and Supplementation - Calorie Density? Formula Concentration can be done by decreasing the amount or water added in the mixing of the formula. Sta
a) What is 'vaso-constriction'? b) What are the effects of vaso-constriction in the skin? a) Vaso-constriction is the reduce in diameter of small arterioles an
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