active transport


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active transport

n.
The movement of a chemical substance through a gradient of concentration or electrical potential in the direction opposite to normal diffusion, requiring the expenditure of energy: active transport across a cell membrane.

active transport

n
(Biochemistry) biochem physiol a process by which molecules are enabled to pass 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 assisted by carrier proteins, commonly referred to as pumps

ac′tive trans′port


n.
the movement of ions or molecules across a cellular membrane from a lower to a higher concentration.
[1960–65]

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. The energy needed for active transport is supplied by ATP.

active transport

An energy-requiring process which carries substances across cell membrane against a concentration gradient.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.active transport - transport of a substance (as a protein or drug) across a cell membrane against the concentration gradientactive transport - transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
drug - a substance that is used as a medicine or narcotic
transport - an exchange of molecules (and their kinetic energy and momentum) across the boundary between adjacent layers of a fluid or across cell membranes
References in periodicals archive ?
High costs to build new roads seemed to put safe active transport out of reach.
4 trillion economy and prepare for post-oil era, with the combined value of 1,424 active transport projects in the region crossing $392.
According to a study released by Dubai-based BNC Network, the number of active transport projects in the UAE increased from 470 in November 2016 to 496 by the end of November 2017.
Moreton Bay Regional Council Mayor Allan Sutherland said the inclusion of signalised pedestrian crossings and dedicated cycle lanes would make it easier for local residents to use active transport to reach their destinations.
READ: Value of active transport projects in UAE exceeds $87bn in H1 2017
They added: "This is also meant as a wake-up call to organisations responsible for providing the safe passage of people choosing to use active transport, including Birmingham City Council and the recently-formed Transport for West Midlands.
Dubai: The total value of 481 active transport projects in the UAE exceeded Dh321.
Mode of transportation: all participants were asked how they usually carry their food, given a choice of: taking their car, public transportation (bus or metro), active transport (travel on foot or bicycle), or other.
Other HIAs that looked at mortality effects of increases in active transport found considerable reductions in premature deaths, with most benefits attributable to increases in PA (Rojas-Rueda et al.
In the development plan of public transport and active transport system it is necessary to pay attention to the following issues:
SNP councillors have blocked a cycle path project in spite of their party's active transport strategy.
However, active transport has recently begun to be explored and this work shows that active transport particles can be made smaller and faster," he added.