passive diffusion


Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia.
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
Farlex Partner Medical Dictionary © Farlex 2012

pas·sive dif·fu·sion

(pas'iv di-fyū'zhŭn)
Passage of molecules across a semipermeable membrane without expenditure of energy.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

pas·sive dif·fu·sion

(pas'iv di-fyū'zhŭn)
Passage of molecules across a semipermeable membrane without expenditure of energy.
Medical Dictionary for the Dental Professions © Farlex 2012
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.
vascular shunts and local perfusion:diffusion ratio inequalities) reduce the effectiveness of the placenta for passive diffusion. Consequently, this approach provides the maximal diffusive conductances achievable under optimal conditions.
Passive diffusion of SA through cellulose acetate membrane was compared with iontophoretic diffusion by various current profiles.
Chlorophyll-a content from passive diffusion periphytometer treatment arrays were compared using analysis of variance and means were separated using the least significant difference procedure with an [alpha] = 0.10 (this [alpha] was selected because of the inherent variability associated with periphytometers).
Molecules traverse the membranes either by passive diffusion or active transport.
For example, a passive diffusion periphytometer is used to assess algal nutrient limitation and assimilation capacity in streams; this technology may be used to develop nutrient management thresholds for streams based on comprehensive measures of nutrient assimilative capacity.
The idea of active transport is contrasted with passive diffusion. In this chapter, as well as the preceding chapter, a thermodynamic approach is used.
In this study, we applied [Cl.sup.-] concentrations up to 12 mM in an attempt to identify a passive diffusion component of [Cl.sup.-] uptake.
Local movement in herbivorous insects: applying a passive diffusion model to mark-recapture field experiments.
A pound of moth balls spread on a carton, allowed passive diffusion into the atmosphere.

Full browser ?