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Facilitated diffusion in cell membrane, showing ion channels and carrier proteins. Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. [1]
Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes. [ 1 ] [ 2 ] Instead of using cellular energy , like active transport , [ 3 ] passive transport relies on the second law of thermodynamics to drive the movement of substances across cell membranes.
Fick's first law relates the diffusive flux to the gradient of the concentration. It postulates that the flux goes from regions of high concentration to regions of low concentration, with a magnitude that is proportional to the concentration gradient (spatial derivative), or in simplistic terms the concept that a solute will move from a region of high concentration to a region of low ...
I often used “passive resistance” and “satyagraha” as synonymous terms: but as the doctrine of satyagraha developed, the expression “passive resistance” ceases even to be synonymous, as passive resistance has admitted of violence as in the case of the suffragettes and has been universally acknowledged to be a weapon of the weak ...
A use of force continuum is a standard that provides law enforcement officers and civilians with guidelines as to how much force may be used against a resisting subject in a given situation. In some ways, it is similar to the U.S. military 's escalation of force (EOF). The purpose of these models is to clarify, both for law enforcement officers ...
Cathodic protection (CP; / kæˈθɒdɪk / ⓘ) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. [1] A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes instead ...
Nonviolent resistance, or nonviolent action, sometimes called civil resistance, is the practice of achieving goals such as social change through symbolic protests, civil disobedience, economic or political noncooperation, satyagraha, constructive program, or other methods, while refraining from violence and the threat of violence. [ 1 ]
An antiporter (also called exchanger or counter-transporter) is an integral membrane protein that uses secondary active transport to move two or more molecules in opposite directions across a phospholipid membrane. It is a type of cotransporter, which means that uses the energetically favorable movement of one molecule down its electrochemical ...