The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration. Because active transport involves moving the molecule against the natural flow of the concentration gradient, the process requires energy.
The process of moving molecules across a membrane, generally from an area of lower concentration to an area of higher concentration which is unfavorable and thus requires energy input.
The transport of a substance across a biological membrane against a concentration gradient—that is, from a region of low concentration (of that substance) to a region of high concentration. Active transport requires the expenditure of energy and is a saturable process. (Contrast with facilitated diffusion, free diffusion; see primary active transport, secondary active transport.)
the movement of solutes against a gradient and requires the expenditure of energy (usually ATP).
the movement of molecules across a membrane from a region of low concentration to a region of high concentration that requires the expenditure of energy (ATP).
Movement of ions and other molecules against the prevailing concentration and electrical gradients. Usually involves carrier proteins and always expenditure of metabolic energy. Indirect movements can be associated. See secondary active transport.
transport across a cell membrane which requires energy generated by the hydrolysis of some energy carrier (usually ATP). The selective active transport of ions (usually sodium) out of the cell is often used as a secondary energy storage mechanism. See ion gradient system.
Movement of ions or molecules against an electrochemical gradient by ulilization of metabolic energy; Related Terms: Extinction
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
Movement of a molecule through a membrane against its concentration gradient, using a carrier protein and energy from ATP. 92
Energy-requiring movement of an ion or small molecule across a membrane against its concentration gradient or electrochemical gradient. Energy is provided by the coupled hydrolysis of ATP or the cotransport of another molecule down its electrochemical gradient.
Movement of a molecule across a membrane or other barrier driven by energy other than that stored in the concentration gradient or electrochemical gradient of the transported molecule.
Transport of molecules against a concentration gradient (from regions of low concentration to regions of high concentration) with the aid of proteins in the cell membrane and energy from ATP. PICTURE
Movement of a molecule across a membrane that requires a protein and cell energy from ATP.
transport of a substance across a membrane against an electrochemical gradient; requires the expenditure of metabolic energy.
The transport, requireing energy, of a molecule across a membrane against a concentration gradient.
An energy-expending mechanism by which a cell moves a chemical across the cell membrane from a point of lower concentration to a point of higher concentra- tion, against the diffusion gradient.
energy-requiring translocation of a substance across a membrane, usually against its concentration or electrochemical gradient
movement of particles across cell membranes requiring the expenditure of energy
The ATP-dependent absorption or excretion of solutes across a cell membrane.
This refers to the transportation of a substance through a membrane that does not occur of its own volition, but instead requires energy to make it happen.
the movement of solute particles from an area of lower concentration to an area of higher concentration with the use of a carrier molecule.
Energy-requiring system that uses transporters to move ions or molecules across a membrane against an electrochemical difference.
Active transport is the of biochemicals, and other atomic/molecular substances, across membranes. Unlike passive transport, this process requires the expenditure of chemical energy to move molecules "uphill" against a gradient. In this form of transport, molecules move against either an electrical or concentration gradient (collectively termed an electrochemical gradient).