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Definition of the noun active transport
What does active transport mean as a name of something?
- transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e. moving from an area of lower concentration to an area of higher concentration. Active transport is usually associated with accumulating high concentrations of molecules that the cell needs, such as ions, glucose and amino acids. If the process uses chemical energy, such as from adenosine triphosphate, it is termed primary active transport. Secondary active transport involves the use of an electrochemical gradient. Active transport uses cellular energy, unlike passive transport, which does not use cellular energy. Active transport is a good example of a process for which cells require energy. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.
- also known as 主動運輸
Printed dictionaries and other books with definitions for Active transport
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by Marion Eugene Ensminger, Audrey H. Ensminger
Active transport. Sometimes substances in the body must be moved from an area where the concentration is low to an area where it is high. Neither osmosis nor diffusion can accomplish this task since they follow a natural downhill tendency.
by Joseph Besharse, Reza Dana
Primary active transport A transport of molecules against a concentration gradient which directly uses energy from hydrolysis of adenosine triphosphate. Secondary active transport A transport of a molecule against a concentration gradient in ...
by Pei-Show Juo
Active Mediated-Transport An active transport that requires transport protein and energy. Active Methionine Referring to S-adenosyl methionine. Active Methyl Referring to either 5-methyltetrahydrofolic acid or S-adenosyl methionine.
by Lindsay Allen, Andrew Prentice
Active transport utilizes a ...
A Dictionary of Biology (2015)
by Elizabeth Martin, Robert Hine
active transport The movement of substances through membranes in living cells, often against a ...
by Percy Russell, Anita Williams
active transport 5 raised or reddened. Sometimes the central area is white and is called a “whitehead." The blackhead is a plugging of the opening of a hair follicle. This plug consists of a mixture of sebum, the normal oily secretion of the ...
by Sharon Cosloy, D. Mark L. Steinberg
active transport The transport, by cells or cellular compartments, of ions and ...
Encyclopedia of Biology (2009)
by Don Rittner, Timothy Lee McCabe
active transport The movement of a substance across a biological membrane, such as living cells, against a concentration ( diffusion) gradient with the help of metabolic energy, usually provided by ATP ( adenosine ...
by Himanshu Arora
Active transport Transport of molecules or ions across a membrane by carrier proteins in the membrane, requiring the expenditure of energy and capable of transport against a concentration in difference. One example found in all animal cells ...
The Pesticide Encyclopedia (2014)
by Kalyani Paranjape, Vasant Gowariker, V N Krishnamurthy, Sugha Gowariker
Active transport: The transport of substances, usually polar molecules or ions, across a membrane against a concentration gradient. Active transport is mediated by specific carrier proteins that selectively bind a substrate and transport it.
Encyclopedia of Astrobiology (2011)
by Muriel Gargaud
Active transport is related with the transport of molecules and ions across the ▷ cell membrane against a concentration gradient. It requires osmotic work. To perform osmotic work, free energy is required. When the concentration of a solute in ...
Encyclopedia of Soil Science (2007)
by Ward Chesworth
Active transport does not violate thermodynamic laws, and the overall process can always be reduced to a combination of ...
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