concentration gradient


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Related to concentration gradient: active transport, Facilitated diffusion

den·si·ty gra·di·ent

a solution in which the concentration (density) of a solute increases in a continuous fashion from top to bottom, or end to end, of a container (for example, the centrifuge tube in density-gradient centrifugation).

concentration gradient

a difference in the concentration of a substance on two sides of a permeable barrier.

concentration gradient

The difference in the amounts of a substance on either side of a membrane or in two areas of a biological system. Substances diffuse down a concentration gradient, from the area of higher concentration to lower concentration.
See also: gradient

concentration gradient

a system that is set up where the concentration of any SUBSTRATE (usually in the form of ions or molecules) is different with respect to the concentration elsewhere in the system. For example, ionic concentration across cell membranes, solutes in sap.
References in periodicals archive ?
a] and thus with the definition of concentration gradient driven mass flow yet with a different diffusion coefficient [D.
Additionally, oxygen in the dissolved state establishes concentration gradients between plasma and erythrocytes, and between plasma and the interstitium.
The rate of pressure buildup in the osmometers over the 10-hour period is directly related to solute concentration differences across the membranes; the larger the solute concentration gradient, the more rapidly the pressure increases inside the osmometer.
Age, height, diet, motility, concentration gradients, site of puncture, diurnal variations, and even season at time of birth have been suggested to affect measured concentrations (58, 59).
With increasing copper concentration in the solder, the rate of dissolution decreases because of the concentration gradient reduction.
By simple microbiological experiments according to ASTM D 5590 performed on multilayered paint film species and with different biocide concentration gradients over the cross section, it can be demonstrated that:
The S-parameter exhibited a three-layer depth profile, indicative of a low-defect "skin" layer in the polymer matrix and a concentration gradient in the inorganic solids embedded in the matrix.
The model considers transport of ion due to concentration gradient, electric potential and applied pressure and describes fluid flow and potential distribution inside the capillary.
dc/dx = concentration gradient of the gas (or the change in gas concentration over change in depth)
Weiss and his colleagues placed the signal-generating cells in the middle of a lab dish where they produced a concentration gradient that diminished toward the dish edges.
Gas diffusion rate is proportional to the concentration gradient according to Fick's 1st Law (Eqn 1) (Glinski and Stepniewski 1985; Ghildyal and Tripathi 1987).
Congenital iodide transport deficit (ITD) is an infrequent autosomic recessive condition characterized by inability of the thyroid gland to maintain a concentration gradient of iodide between the plasma and the thyroid follicular cell, resulting in hypothyroidism, diffuse or nodular goiter, and little or no uptake of radioiodine.

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