facilitated transport

(redirected from passive diffusion)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial.
Related to passive diffusion: passive transport

facilitated transport

[fə′sil· ə‚tād·əd ′trans‚pȯrt]
(physiology)
The transport of certain materials across a cell membrane, down a concentration gradient, assisted by enzymelike carrier proteins embedded in the membrane and without the explicit provision of energy.
Mentioned in ?
References in periodicals archive ?
The filter of the organic acids passive diffusion sampler is impregnated in an alkali, which is dissolved in an aqueous solution after exposure and the extracted acetate and formate are determined by ion chromatography.
Evalution of method of preparation of passive diffusion tubes for measurement of ambient nitrogen dioxide, Journal of Environmental Monitoring 6: 12-17.
B12 is absorbed by the GI tract in two ways through active transport and passive diffusion.
vascular shunts and local perfusion:diffusion ratio inequalities) reduce the effectiveness of the placenta for passive diffusion.
Also the presence of the drug mostly in its dissociated form at physiological pH further limits its capacity for passive diffusion.
It is known that molality of creatinine in erythrocyte fluid is equal to molality in plasma (2) and that creatinine is transported by passive diffusion through the lipid bilayer of the erythrocyte membrane (3).
Magnesium is primarily absorbed in the proximal small bowel via passive diffusion and excess magnesium is efficiently eliminated in the urine.
Here the effect of passive diffusion was subtracted from the iontophoretic diffusion after calculating the passive diffusion separately under identical conditions.
Transdermal patches can have different designs but are meant to deliver drugs across the skin using passive diffusion," said Bozena B.
Opiates, PCP, amphetamines, and cocaine enter oral fluid through passive diffusion of the drug from the bloodstream into oral fluid.

Full browser ?