density gradient
A column of liquid in which the density varies continually with position, usually as a consequence of variation of concentration of a solute. Such gradients may be established by progressive mixing of solutions of different density (as for example, sucrose gradients) or by centrifuge-induced redistribution of solute (as for caesium chloridegradients). Density gradients are widely used for centrifugal and gravity-induced separations of cells, organelles and macromolecules. The separations may exploit density differences between particles, or primarily differences in size, in which latter case the function of the gradient is chiefly to stabilize the liquid column against mixing.

Dictionary of molecular biology. 2004.

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  • Density gradient — is a spatial variation in density over an area. The term is used in the natural sciences to describe varying density of matter, but can apply to any quantity whose density can be measured. [1] [2] Contents 1 Aerodynamics 2 …   Wikipedia

  • density gradient — progressive variation in density over a distance; used particularly for that of a solute along the height or width of a confined solution; see also under centrifugation …   Medical dictionary

  • density gradient centrifugation — noun (biology) The separation of cells, cell components or complex molecules on the basis of their density differences by centrifuging them to their density equilibrium positions in gradients established in appropriate solutions • • • Main Entry …   Useful english dictionary

  • density gradient centrifugation — density gradient centrifugation. См. центрифугирование в градиенте плотности. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • density gradient centrifugation — High speed centrifugation in which molecules are separated on the basis of their different densities using a concentration gradient of caesium chloride or sucrose. The density gradient may either be formed before centrifugation by mixing two… …   Glossary of Biotechnology

  • density gradient centrifugation — ultracentrifugation in a liquid, such as cesium chloride solution, the density of which increases along the lines of centrifugal force, the substances under test or preparation seeking their level of density …   Medical dictionary

  • cesium chloride equilibrium density gradient centrifugation — cesium chloride equilibrium density gradient centrifugation. См. центрифугирование в градиенте плотности хлорида цезия. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995… …   Молекулярная биология и генетика. Толковый словарь.

  • sucrose equilibrium density gradient centrifugation — sucrose equilibrium density gradient centrifugation. См. центрифугирование в градиенте плотности сахарозы. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • velocity density gradient centrifugation — A procedure used to separate macromolecules based on their rate of movement through a density gradient …   Glossary of Biotechnology

  • equilibrium density gradient centrifugation — A procedure used to separate macromolecules based on their density (mass per unit volume) …   Glossary of Biotechnology

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