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active gradient

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См. также в других словарях:

  • active transport — n movement of a chemical substance by the expenditure of energy against a gradient in concentration or electrical potential across a plasma membrane * * * (in biochemistry) an energy dependent process in which certain substances (including ions,… …   Medical dictionary

  • Active contour — Active Contour, also called Snakes, is a framework for delineating an object outline from a possibly noisy 2D image.This framework attempts to minimize an energy associated to the current contour as a sum of an internal and external energy:*The… …   Wikipedia

  • Active transport — This article is about transport in cellular biology. For human transport systems, see active transportation. The action of the sodium potassium pump is an example of primary active transport. Active transport is the movement of a substance… …   Wikipedia

  • active transport — Often defined as transport up an electrochemical gradient. More precisely defined as unidirectional or vectorial transport produced within a membrane bound protein complex by coupling an energy yielding process to a tranport process. In primary… …   Dictionary of molecular biology

  • active transport — noun Date: 1963 the movement of a chemical substance by the expenditure of energy against a gradient in concentration or in electrical potential across a plasma membrane …   New Collegiate Dictionary

  • active transport — The transportation or movement of substances through differentially permeable cell membranes against a concentration or electrical gradient with the expenditure of energy …   Dictionary of invertebrate zoology

  • active transport — The transport of solute molecules across a membrane against an electrochemical gradient; it requires a carrier protein and the input of energy …   Dictionary of microbiology

  • active transport — (in biochemistry) an energy dependent process in which certain substances (including ions, some drugs, and amino acids) are able to cross cell membranes against a concentration gradient. The process is inhibited by substances that interfere with… …   The new mediacal dictionary

  • active transport — The movement of a molecule or groups of molecules across a cell membrane, which requires the expenditure of cellular energy, because the direction of movement is against the prevailing concentration gradient …   Glossary of Biotechnology

  • active transport — noun transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy • Topics: ↑drug • Hypernyms: ↑transport …   Useful english dictionary

  • Electrochemical gradient — An electrochemical gradient is a spatial variation of both electrical potential and chemical concentration across a membrane; that is, a combination of the membrane potential (delta psi) and the pH gradient (delta pH). Both components are often… …   Wikipedia

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