facilitated transport

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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.
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References in periodicals archive ?
Many thanks to Erik Andresen, Nina Dahl and colleagues at the Norwegian Institute for Air Research (NILU) for the preparation and analysis of passive diffusion gas samplers.
Reliability of nitrogen dioxide passive diffusion tubes for ambient measurement: in situ properties of the triethanolamine absorbent, Journal of Environmental Monitoring 2: 307-312.
In view of the observed pH--solubility profile, for a 50% v/v propylene glycol:water vehicle, a pH between 4 and 5 was suggested by the authors to provide the most favourable environment for passive diffusion since the concentration of unionised methotrexate would be optimal.
Passive diffusion of SA through cellulose acetate membrane was compared with iontophoretic diffusion by various current profiles.
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.
We may only speculate that oral thyroxine is administered as sodium salt that is less lipophilic than the native hormone, which enters target cells both through passive diffusion and in a carrier-mediated, inhibitable way.

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