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Define Ion exchange chromatography?
In this method a reversible exchange of ions is effected. Usually resins and ionic solutes are the two components involved in ion-exchange. Ion exchange resins are of two types cation and anion exchange resins. The acidic or cation exchange resins contain sulfonic acid groups (SO3H), carboxylic groups (COOH) or phenol groups (OH).
Basic or anion exchange resins contain weakly basic amine groups (NH2) or strongly basic quarternary ammonium groups (NH4)+ OH-. The surfaces of acid resins bind cations such as H, Na+, Ca2+, NH4+. The basic or anion exchange resins carry positive charges on the surface and thus adsorb negative ions.
Which of the following statements about how B and T cells recognize antigen are true? a. B cells only recognize antigen presented by class I or class II MHC molecules. b. Both cell
Q. What is the nitrogen cycle? The nitrogen cycle represents the recycling and circulation of the chemical element nitrogen in nature. The nitrogen cycle fundamentally depends
BRONCHOSCOPY: Bronchoscopy is the passage of lighted bronchoscope into the bronchial tree. Bronchoscopy may be performed with rigid steel of flexible fiberoptic instruments.
a report on similarities and diffrences between protozoans and mesazoans
Nucleotides Compounds consisting of a nitrogenous base, a pentose sugar and a phosphate group.
Define Placental secretion of oestrogens During pregnancy? Placental secretion of oestrogens increase with progression of pregnancy. Oestrogens perform many functions. They sti
Define Food availability and Food Access? Food availability: This refers to availability of necessary types of food in sufficient quantity, to the individual. The sources may b
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
In the process of tissue culture in plants, what is required to induce the formation of a complete plant, in addition to a growth medium with nutrients? The appropriate p
Avian tuberculosis The infection in poultry usually occurs from ingestion of contaminated food and water. The lesions develop in spleen, liver and intestines; less frequently
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