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!
Fensom and Spanner Electroosmotic Flow Hypothesis
In electroosmosis the ions flow across a membrane in response to electrical gradient. Ions pull along water and other contents because of solvent drag. In this hypothesis it is visualised that sap flows in the lumen of sieve element and electroosmosis occurs across the sieve plate. The basic idea of this model is represented in Figure. The pores of sieve are negatively charged and many positive ions are associated with them. The companion cells of consecutive sieve elements are shown to be engaged in K+ uptake and release. This generates a (K+) gradient in the direction of phloem sap flux; the fluxes of other solutes are coupled to K+ flux and move along with the electroosmotic flow from one sieve tube to the next.
Figure: Active uptake of K+ by the companion cell from its associated sieve tube on the left and secretion of K+ into the sieve tube at the right side by its companion cell generate both e potential difference and a K+ concentration gradient. This causes a now of K+ ions and other solutes from right hand side to left.
Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the pro
H y po c a l c a e m i a It is also known as milk fever or parturient paresis. The disease occurs due to imbalance in input and output of calcium and is characterize
What are compound eyes? Arthropods have compound eyes made of many visual units called ommatidia. Every ommatidium transmits visual information by the optic nerve to the brain,
Locomotion in Annelida Before we discuss the details of locomotion in annelids, we have to recapitulate the major subdivisions of the phylum Annelida. Phylum Annelida contain
Q. How Drying used for sterilization? Moisture is essential for bacteria, drying therefore has a deleterious effect on most bacteria. Spontaneous drying can often kill bacteria
Signify the term - Proglottids? Serially repeating segment like structures found in tapeworms which contain reproductive organs. Immature proglottids are continually added at t
why obelia is considered to be of special interest in zoology as an animal showing an intermediate grade of organisation
Puerperal Psychosis: Child birth can precipitate schizophrenia, depression and mania. Management: it depends on the nature of the symptoms. Danger to self and othcrs (inc
Explain Glutathione peroxidase Glutathione peroxidase is a natural antioxidant present in many tissues. Together, with vitamin E it is part of the body's defense against lipi
Erythropoietin (EPO) A. acts by increasing the production of red blood cells by cells in the bone marrow. B. is secreted by peritubular interstitial cells of the kidney cort
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