passive diffusion
The process in which molecules move from a region of higher concentration to one of lower concentration as a result of random thermal agitation.

Microbiology. . 2009.

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  • Passive transport — means moving biochemicals and other atomic or molecular substances across membranes. Unlike active transport, this process does not involve chemical energy, because, unlike in an active transport, the transport across membrane is always coupled… …   Wikipedia

  • Diffusion — Diffusion, auf der Wärmebewegung der Teilchen eines Gases oder eines gelösten Stoffes beruhender Konzentrationsausgleich, bei dem sich die Teilchen im gesamten zur Verfügung stehenden Raum ausbreiten. Verschiedene Stoffe mit unterschiedlichen… …   Deutsch wörterbuch der biologie

  • Diffusion (BWL) — In Disziplinen wie der Soziologie, Kommunikationswissenschaft oder der Betriebswirtschaft werden unter dem Begriff der Diffusionstheorie die theoretischen Konzepte der Diffusion und der Adoption zusammengefasst. Die Diffusionstheorie beschäftigt… …   Deutsch Wikipedia

  • passive transport — The movement of a substance, usually across a plasma membrane, by a mechanism that does not require metabolic energy. See active transport, transport protein, facilitated diffusion, ion channels …   Dictionary of molecular biology

  • diffusion — 1. The random movement of molecules or ions or small particles in solution or suspension under the influence of brownian (thermal) motion toward a uniform distribution throughout the available volume; the rate is relatively rapid among liquids an …   Medical dictionary

  • passive transport — noun transport of a substance across a cell membrane by diffusion; expenditure of energy is not required • Hypernyms: ↑transport …   Useful english dictionary

  • facilitated diffusion — (= passive transport) A process by which substances are conveyed across cell membranes faster than would be possible by diffusion alone. This is generally achieved by proteins that provide a hydrophilic environment for polar molecules throughout… …   Dictionary of molecular biology

  • Stofftransport: Aktive und passive Vorgänge —   Damit die Zellen des Körpers ihre Funktion wahrnehmen können, sind sie darauf angewiesen, dass ihnen Stoffe von außen (hauptsächlich Nährstoffe und Sauerstoff) zugeführt werden. Gleichzeitig müssen Abfallprodukte der Zellen (z. B. Kohlendioxid) …   Universal-Lexikon

  • Continuous passive motion — A continuous passive motion machine for knee joint recovery Continuous passive motion (CPM) devices are used during the first phase of rehabilitation following a soft tissue surgical procedure or trauma. The goals of phase 1 rehabilitation are… …   Wikipedia

  • Facilitated diffusion — (or facilitated transport) is a process of diffusion, a form of passive transport facilitated by transport proteins. The facilitated diffusion may occur either across biological membranes or through aqueous compartments of an organism. Polar… …   Wikipedia

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