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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.
Long-term Follow-up Results : To evaluate the long-term results of surgery, one has to take into consideration the natural history, results of medical treatment and that of PTCA.
What are the sign of Horner's syndrome? 1. Miosis, 2. ptosis, 3. enophthalmos, 4. anhidrosis and 5. heterochrome iridis.
State the ways in which (a) all plant cells, (b) some plant cells vary from animal cells. (a) All plant cells have a cellulose cell wall. (b) Some plant c
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MOSAI C THOERY - It was given by W. Roux. He studied the development of frog's egg. He destroyed one cells by a hot needle out of 2-cells formed as a result of first cleava
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1- Describe the function of enzymes in catalyzing biological reactions ? 2-Descride enzymes ' role in reducign activation energy?
Q How are the concepts of the DNA, gene, and proteins characteristics of living beings related? Characteristics of organisms depend on chemical reactions that take place in the
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