TERMIUM Plus®

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GRADIENT CONCENTRATION [3 records]

Record 1 2010-12-22

English

Subject field(s)
  • Biological Sciences
DEF

Solution in which the ratio of solvent to solute changes from one region to another in a defined manner. A continuous gradient is formed by mixing a concentrated solution with a less concentrated solution, or pure solvent, in a continuous manner. A stepwise gradient is produced by layering a series of gradually less concentrated solutions one above the other in a suitable container, often a centrifuge tube.

French

Domaine(s)
  • Sciences biologiques
CONT

La centrifugation à equilibre de densité [...] ressemble à la centrifugation de zone, [...] elle met également en jeu un liquide de support en gradient de concentration, mais ici on utilise un liquide de très forte densité : eau lourde, saccharose à très haute concentration. Les particules sont fractionnées, en fonction non de leur constante de sédimentation, mais de leur densité apparente. Il s'agit d'une centrifugation d'équilibre : la particule se déplace jusqu'à ce qu'elle se trouve dans un liquide de même densité qu'elle-même. Cette méthode permet de séparer mitochondries et lysosomes.

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
Save record 1

Record 2 2001-03-13

English

Subject field(s)
  • Textile Industries
  • Synthetic Fabrics
  • Textiles: Preparation and Processing
CONT

diffusion: A more or less gradual movement of molecules or ions through a solution or fiber as a result of the existence of a concentration gradient or repulsive or attractive forces.

French

Domaine(s)
  • Industries du textile
  • Textiles artificiels et synthétiques
  • Apprêt et traitements divers (Textiles)

Spanish

Save record 2

Record 3 2000-06-28

English

Subject field(s)
  • Semiconductors (Electronics)
DEF

A difference in carrier concentration (holes or free electrons) from point to point in a semiconductor.

French

Domaine(s)
  • Semi-conducteurs (Électronique)

Spanish

Save record 3

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