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!
Define about the Column chromatography?
In column chromatography, a tube is filled with the material constituting the stationary phase, plus a solvent (mobile phase). The general adsorbent (stationary phase) used are alumina, silica gel, activated carbon, calcium phosphate and hydroxyapatite. The substances to be separated are dissolved in the smallest possible volume of a suitable solvent and applied on the top of the stationary phase and allowed to enter the column. The chromatogram is then developed by flowing a solvent (the mobile phase) through the column. As different substances move through the column, they separate and appear in the effluent when particular volumes of liquid have passed through the column. The liquid leaving the column (the eluent) is usually collected as discrete fractions, using an automatic collector.
The separated components are then identified by testing aliquots of each fraction by one or a combination of the following methods viz. colorimetry, UV absorption, fluorimetry, scintillation counting, refractive index, spectral diode array system, electrochemical detection, radioimmunoassay and enzyme immunoassay. When automatic fraction collector is used the recorder automatically draws each peak and the area of each peak is proportional to the amount of sample component present in it. The simplest form of column chromatography is adsorption chromatography. Separation of components by this method depends upon differences both in their degree of adsorption by the adsorbent and solubility in the solvent used for separation. These physiochemical factors are governed by the molecular structure of the compound.
Competition - Processes in Succession The aggregation of individuals in an area leads to inter specific and intra specific competition. The competition is usually for
Select all that are true or correct regarding a buffer: alternately donating and accepting ions a set of chemicals that work together to resist pH change often a weak acid or base
difference between holophytic nutrition and holozoic nutrition.
Q. What are the endocrine functions of the placenta? The placenta has endocrine function since it secretes the hormones estrogen and progesterone that maintain the endometrium
The cost of replacing these indirect uses of biodiversity, even if it were technically possible, would be so high as to render it impossible to duplicate. We also do not know how
Basic Planes of Cleavage The basic planes along which the egg and its daughter blastomeres are divided during early cleavage are: A. Meridional Plane - the cleavag
Briefly explain how amniocentesis and chorionic villi sampling are used in genetic screening. A small sample is removed from the amniotic fluid surrounding the fetus or from t
Roller Pump: This is the type most commonly used in clinical perfusion. It has a circular metal housing inside which there is a rotating urn with two rollers fixed at 180 degrees
Q. Definition of Biological diversity? Biological diversity has no single standard definition. One definition holds that biological diversity is a measure of the relative diver
Cell membrane lining the inner surface of the cell wall The cell membrane lining the inner surface of the cell wall is made up of phospholipids (45%) and proteins (55%). Some
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