Concentration gradient

concentration gradient
A regular increase of decrease in the intensity or density of a chemical substance. Cells often maintain concentration gradients of H+ ions across their membranes.
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concentration gradient The difference in concentration in two parts of a system.
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a concentration gradient (20/0.1 = 200) and a
electrostatic gradient (moving a negative charge against a voltage of − 70 mV).
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If and when the concentration gradient have been eliminated, no net exchange of material occurs. Although material may move forth from one area to the other, it will be balanced by movement of the same amount of material to the opposite direction.
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This article is about the physical mechanism of diffusion. For alternative meanings, see diffusion (disambiguation).
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Responses to the Concentration Gradient
Coordinate genes such as bicoid lay down the grand plan, so to speak, upon which the genes downstream will act. The pattern of the developing embryo arises as these downstream genes are activated or repressed.
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Movement against a concentration gradient requires energy. The energy is supplied by ATP which is released by breaking a phosphate bond to produce ADP:
ATP ADP + Pi + energy ...
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passive transport Transport of a molecule across a membrane down a concentration gradient which does not require the input of energy. -pathy disease of, suffering pathogenic Disease-causing.
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Some of these proteins can move materials across the membrane only when assisted by the concentration gradient, a type of carrier-assisted transport known as facilitated diffusion.
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Movement of a molecule through a membrane against its concentration gradient, using a carrier protein and energy from ATP
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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energy-expanding process in which cells transport materials across the cell membrane against a concentration gradient.
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passive transport (facilitated diffusion) - movement of a molecule across a membrane down its concentration gradient
peripheral membrane proteins-proteins that can be released from the membrane ...
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