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Define ascending type of paper chromatography?
The ascending type consists in dipping the lower end of the paper containing the sample spots into the solvent so that it is above the solvent depth and then allowing it to rise up the paper by capillary action. The mobile phase or solvent moves in the upward direction against the gravitational force. The rate of movement of solvent becomes slower with increasing height which provides enough time for partition equilibrium between the two phases to take place. However the disadvantage in this is that compounds with low Rf values may not separate well.
Which term is used to describe the process whereby a catheter is inserted into an individual's heart, a radio-opaque medium is injected & x-ray images are made. Procedure is use
general charactristics of phylum protozoa
Three ways in which food might become contaminated by harmful bacteria. Food may become contaminated:- (i) from the unwashed hands of a food-handler, (ii) by house- flies
Ecological taxonomy notes
Q. What is the function of mineral salts in the creation of electric tension (voltage) at the cellular level? The electric activity of the cell, for example, in neurons, depend
Define Function of the Iron Uptake by Cells? Iron has several vital functions in the body. It serves as a carrier of oxygen to the tissues from the lungs by red blood cell haem
Point out some Difference between Tumor And Cancer? Tumor is a swelling or growth because of an abnormal growth of tissue. Tumors can either be benign or malignant. The benign
Lateral Roots - Root Apex Lateral roots normally arise at a definite distance behind the tip from areas close to or opposite the points of xylem star. So, a triarch root can
Effect of Temperature Certain plants such as the winter rye (Secale cereale) and the biennial strain of henbane (Hyoscyamus Niger) require exposure to low temperature conditio
Q. High Para-sternal or Ductal View? This view is obtained by sliding transducer one or two spaces upward and medially from PLAX view. This view is specifically used to vi
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