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 ?
This means that strontium, like calcium, is at least partially absorbed by active transport.
The new company was named Active Transport and was 60% minority owned.
The junction between the capillary cells in the central nervous system are tightly sealed and active water soluble molecules can cross these capillary walls only through a selective, active transport system.
Many drug delivery specialists have developed novel technology platforms to improve the passive or active transport of therapeutics across the blood-brain barrier through the encapsulation of drugs within liposomes (ArmaGen Technologies, Corden Pharma Switzerland), bolaamphiphilic vesicles (Lauren Sciences), and nanoparticles (to-BBB Technologies).
2 metres average width ) with additional active transport improvements.
The people who receive the bicycles will have to complete training courses on how to ride and how to maintain their bicycles and by encouraging active transport to stay healthy, Birmingham City Council will help to reduce the long-term NHS costs in Birmingham that inactivity causes.
Market Sector Dynamics Traditional Patch Markets Emerging Markets Transdermal Patch Market Drivers Prescription Patch Design & Technology Passive Patch Architecture Passive Transdermal Patch Design Passive Patch Construction Active Transport Patch Technologies Iontophoresis Electroporation Microporation Mechanical Arrays Radio Frequency Thermal/Heat Ultrasound Prescription Patch Development Factors Key Transdermal Therapeutic Markets Transdermal Product Company Profiles
Factors commonly associated with "obesogenic society" include whether or not we have access to affordable, healthy food, access to and chance to engage in all forms of physical activity, including active transport schemes, safe cycle paths, affordable exercise classes or accessible green space; restricted availability of fast food, controlled food advertising and so on.
This enzyme is responsible for the active transport of sodium and potassium ions through the cellular membrane.
In particular we're asking parties to commit to: developing a national strategy to reduce Australia's demand for imported oil; mandating fuel consumption and emission standards to be compatible with the European Union and Japan; legislating to ensure all electric vehicles will be supplied by clean renewable energy; and drastically increasing investment in and service quality of our public and active transport systems.
Sunday June 6 - Change Your Walk Today's theme will be health and active transport.
These studies demonstrate that MT-3 interacts with proteins that are involved in cytoskeleton reorganization of the cell and thereby regulating the vectorial active transport and cell differentiation.