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Yogita Ingle 7 years ago
Chromatography: (Tswett 1906) is a general term which involves processes by which is a mixture of different substances can be:(a) separated, (b) purified and (c) identified. Originally this technique was employed to separate coloured components from their mixture in the form of distinct zones as rings called Chromatograms. Now it is used for the separation and purification of coloured as well as colourless substances.
Principle: The technique of chromatography is based on the fact that different constituents of a mixture are adsorbed to different extents by given adsorbent. The medium which carries the mixture of example solvent (such as ether, benzene, alcohol etc.) is called a moving phase and the medium in which various components are adsorbed (such as alumina, silica gel etc.) is called the stationary phase.
The important types of chromatography are:
(i) Column chromatography
(ii) TLC or thin layer chromatography
(iii) Gas chromatography
(iv) Paper chromatography.
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Yogita Ingle 7 years ago
Centrosome is also called as the 'cell centre'. Centrosome is a rod like organelle occurring near the nucleus. Centrosome is formed by 2 centrioles, each being formed by 9 triplet microtubules in 9+0 arrangement encloses structures called as centrioles. It helps the cell during cell division by the formation of spindle fibres. It is specifically present in animal cells only.
Centriole as an organelle is made to use in organizing the mitotic spindle and completing the cytokinesis. At one point in time, centrioles were believed to be necessary for the creation of mitotic spindle in the <a href="https://byjus.com/biology/animal-cell/">animal cell</a>. Although, many fresh experimentations established that the cell which does not have a centriole (surgically removed through laser) could function without them in the G1 level of interphase and then the centriole could be created in the future in a de novo manner.
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According to de Broglie electron is considered as wave and thus circular orbit where electron revolving should contain wavelength as a whole number.
So the circumference (C) of this circle in terms of radius can be written as,
C = 2πr
And whole number of wavelengths (nλ) should be equal to this circumference
Thus, 2πr = nλ
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Krishna Yadav 6 years, 11 months ago
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Sakshi Sharma ??️??️??️ 7 years ago
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