Article: Active Transport
Biology;      700+ words ......up their concentration gradient , using energy. Concentration Gradients The concentration...down their concentration gradient. A concentration...against their concentration gradients. Types of...large ion concentration differences...up their ...

Article: diffusion gradient
A Dictionary of Biology;      7 words ...diffusion gradient See concentration gradient .

Article: symporter
A Dictionary of Biology;      111 words ......x2019; uphill against its concentration gradient by the flow of the ions down their pre-existing concentration gradient. Hence, it is a form of...energy stored in the ionic concentration gradient, which is maintained by...

Article: cotransporter
A Dictionary of Biology;      66 words ......by movement of one of the substances (usually an ion) down its concentration gradient; this drives movement of the other substance against its concentration gradient. In antiporters the two substances move in opposite directions...

Article: uniporter
A Dictionary of Biology;      24 words ...uniporter A transport protein that moves molecules across a membrane in one direction only down their concentration gradient. Compare antiporter ; symporter .

Article: morphogen
A Dictionary of Earth Sciences;      24 words ...morphogen An environmental factor, such as a chemical substance, that establishes a concentration gradient affecting morphogenesis in organisms exposed to it.

Article: Humidity and pollution effects on Pb-free assemblies: a study of how metallization and operating voltage influence electrochemical migration.(Cover Story)
Circuits Assembly;  April 1, 2007 ;     700+ words ......observed independent of the concentration gradient at the cathode (Figure...small relative to the concentration gradient of the migrated ions, the ions diffuse along the concentration gradient. If the concentration...

Article: concentration gradient
A Dictionary of Biology;      66 words ...concentration gradient ( diffusion gradient ) The difference in concentration between a region of a solution or gas that has a high density of particles...

Article: antiporter
A Dictionary of Biology;      116 words ......ions (H + ) or sodium ions (Na + ), flow down their concentration gradient, and in so doing provide the energy for the transport...from the energy-consuming mechanisms that establish the concentration gradient of the driving ions. Compare symporter ; uniporter .

Article: contaminant transport
The Oxford Companion to the Earth;      700+ words ......energy in the direction of its concentration gradient. Diffusion continues until the concentration gradient is zero. In technical terms...unit time is equal to the concentration gradient d C /d L , where C (in kg...

Article: Transport
Animal Sciences;      700+ words ......occurs when the molecule has a concentration gradient, meaning that it exists in larger...an adjacent location. If a high concentration gradient is established, it means that the...the other side. The larger the concentration gradient, the stronger the driving force...

Article: Cell Membrane Transport
World of Microbiology and Immunology;      700+ words ......proportional to the concentration gradient for a given direction...rises. Driven by concentration gradients, diffusion in the...moving against a concentration gradient (i.e., from a region...being moved against a concentration gradient, cellular energy...membrane and ...

Article: gaseous exchange
A Dictionary of Biology;      60 words ......transfer of gases between an organism and the external environment in either direction. It occurs by diffusion across a concentration gradient and includes the exchange of oxygen and carbon dioxide in respiration and photosynthesis. Successful gaseous exchange...

Article: transcellular pathway
A Dictionary of Biology;      77 words ......facing the exterior) and the serosal surface (facing the interior) of the cells can act as ‘gatekeepers’, keeping out certain substances, while transporting others from one side to another, often against a concentration gradient.