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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.
Describe Class Aves in details? Class Aves: The fossil record contains evidence that birds evolved from the reptiles. Birds share anatomical features with Protoavis and Archa
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Using high temperature carbonization, metallurgical coke (hard coke) can be prepared by two processes. 1. Beehive coke oven process. 2. Otto-hoffmann's by-product
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Explain Doxycycline Doxycycline, which frequently causes gastrointestinal disturbances and can cause photosensitivity and vaginitis, offers an inexpensive once-daily alternative
Explain the Process of Solubility test? This test is given by all monosaccharides and disaccharides. Polysaccharides are not soluble in cold water. Principle All monosa
What is eutrophication? Eutrophication is the process of excessive enhancing of nutrients, like phosphate and nitrate, in water because of direct deposit of non treated sewage.
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