concentration gradient


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Related to concentration gradient: active transport, Facilitated diffusion

concentration gradient

[‚kän·sən′trā·shən ‚grād·ē·ənt]
(chemistry)
The graded difference in the concentration of a solute throughout the solvent phase.
References in periodicals archive ?
Dexamethasone concentration gradients along scala tympani after application to the round window membrane.
(ii) swelling phase (II), in which drug release rate decreases, due the decrease of the concentration gradients;
While both simulations and experiments in this configuration confirm the trend that (at equal average hydrogen content) a concentration gradient increases the DDT tendency, this must not be understood as a general conclusion.
We have subfractionated by linear concentration gradient of sucrose the S-nitrosylated membrane fractions of control, nitrite- and GSNO-treated hearts, showing a marked increase in S-nitrosylation after both nitrite and GSNO treatment in proteins migrating from 45 to 50kDa.
where D is the diffusion coefficient, [C.sub.0] is the tubulin concentration outside the tubulin gradient, and L is the length of the tubulin concentration gradient. The flux can also be calculated by dividing the amount of tubulin consumed in a fast growth period by the area of the microtubule assembly site and the duration of the fast growth period.
The ionic transport behaviors of hour-glass shaped alumina nanochannels under the pH or ionic concentration gradient conditions were investigated in an electrochemical cell.
The latter route leads to the underlying lamina propria, which consists of connective tissue, blood vessels, and lymph capillaries, and thus the substance enters the circulation (Figure The process in which the ions enter the cell is passive diffusion under concentration gradient and potential gradient.
The heat transfer caused by concentration gradient is called the diffusion thermo or Dufour effect.
The concentration gradient of salt developing around the growing crystallite can be seen as reverse osmotic pressure that hinders the growth rate of the crystallites.
Enterohepatic circulation of bile acids results in efficient reabsorption of bile acids, resulting in a concentration gradient between proximal small intestine and terminal ileum.
Sperm - in particular those of marine species - swim along convoluted paths in a chemical concentration gradient.
The theoretical background of the diffusion is based on an intuitive hypothesis: the driving energy that governs the mass transfer is related to the concentration gradient of molecules or atoms or ions in a diffusion medium, which can be simply the vacuum or a gas/liquid/solid phase.

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