passive diffusion


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Related to passive diffusion: passive transport

fa·cil·i·tat·ed trans·port

the protein-mediated transport of a compound across a biomembrane that is not ion-driven; a saturable transport system.
Synonym(s): passive transport

pas·sive dif·fu·sion

(pas'iv di-fyū'zhŭn)
Passage of molecules across a semipermeable membrane without expenditure of energy.

pas·sive dif·fu·sion

(pas'iv di-fyū'zhŭn)
Passage of molecules across a semipermeable membrane without expenditure of energy.

passive

neither spontaneous on the part of the patient, nor active response by the patient, the stimulus having been applied externally.

passive cutaneous anaphylaxis (PCA) test
see passive cutaneous anaphylaxis.
passive diffusion
passage of electrolytes to all parts of a solution, including through a permeable membrane. Plays some part in intestinal absorption.
passive hemagglutination test
passive immunization
see passive immunization.
passive neonatal immunity
see passive immunity.
passive transfer
see passive diffusion (above).
passive venous congestion
noninflammatory distention of vessels with blood. Caused by simple accumulation resulting from obstruction or failure of the heart to eject the full volume of blood returned to it.
References in periodicals archive ?
Overall, N and/or P did not limit periphytic growth on the passive diffusion periphytometers, except at a few streams during select sampling periods (Table 6).
These data from the passive diffusion periphytometers can be alternatively viewed using the Lotic Ecosystem Trophic State Index (LETSI; Matlock et al.
Thus, nutrient limitation experiments using passive diffusion periphytometers need to carefully consider deployment location in streams so that light availability does not become a confounding factor across sites.
Specifically, the objectives were to evaluate periphytic nutrient limitation using passive diffusion periphytometers, the relation between land use and stream nutrient concentrations, sediment nutrient content in select streams, and sediment-aqueous phase equilibrium P concentrations (sediment EPC[.
Periphytic nutrient limitation assessed using passive diffusion periphytometers was seldom observed in streams draining the Eucha-Spavinaw Basin, except P limitation observed in Beaty Creek and Cherokee Creek in the summer.
The tight, or low, permeability of the epithelium in this species is reflected by the longer time required for salt depletion and the lack of evidence for a passive diffusion component in [Cl.
A major problem is that the drug is water soluble and is mostly in ionised form at physiological pH, so its capacity for passive diffusion is limited (1-2).
Molecules traverse membranes either by passive diffusion or active transport.
Pollution of water mainly occurs through (i) passive diffusion as a result of spreading products on crops, and (ii) active pollution caused by washing machinery and tractors - most of the time at the same location.

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