Active transport
the movement of ions or molecules across a cellular membrane from a lower to a higher concentration, requiring the consumption of energy.
historical examples
each inactive tape transport requires two amperes and the one active transport requires 10 amperes.
preliminary specifications: programmed data processor model three (pdp-3) digital equipment corporation
noun
(biochem, physiol) a process by which molecules are enabled to p-ss across a membrane from a region in which they are in a low concentration to one of high concentration; this requires the expenditure of energy in metabolism and is -ssisted by carrier proteins, commonly referred to as pumps
active transport n.
the p-ssage of ions or molecules across a cell membrane against an electrochemical or concentration gradient, or against the normal direction of diffusion.
active transport
the movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration. active transport requires the -ssistance of a type of protein called a carrier protein, using energy supplied by atp.
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engaged in ; characterized by energetic work, partic-p-tion, etc.; busy: an active life. being in a state of existence, progress, or motion: active hostilities. involving physical effort and : active sports. having the power of quick motion; nimble: active as a gazelle. characterized by , motion, volume, use, partic-p-tion, etc.: an active market in wheat; […]
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engaged in ; characterized by energetic work, partic-p-tion, etc.; busy: an active life. being in a state of existence, progress, or motion: active hostilities. involving physical effort and : active sports. having the power of quick motion; nimble: active as a gazelle. characterized by , motion, volume, use, partic-p-tion, etc.: an active market in wheat; […]
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engaged in ; characterized by energetic work, partic-p-tion, etc.; busy: an active life. being in a state of existence, progress, or motion: active hostilities. involving physical effort and : active sports. having the power of quick motion; nimble: active as a gazelle. characterized by , motion, volume, use, partic-p-tion, etc.: an active market in wheat; […]