ion pump


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i·on pump

a membranal complex of proteins that is capable of transporting ions against a concentration gradient using the energy from ATP.

ion pump

a PROTEIN capable of pumping IONS actively across a MEMBRANE against a concentration gradient. See, for example, the SODIUM PUMP.

ion pump,

n a complex of proteins located in the cell membrane that is responsible for actively transporting ions across the membrane against a concentration gradient using energy rich ATP molecules. Functions in maintaining osmotic balance in cells and in the conduction of nerve impulses. See also ATP.

ion

an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost one or more electrons. Substances forming ions are electrolytes.

ion channel
see channel.
dipolar ion
zwitterion.
hydrogen ion
the positively charged hydrogen atom (H+), present to excess in acid solutions.
ion pair
the pair of ions created when an atom has had an electron removed by ionizing radiation.
ion pump
see calcium pump, sodium pump.
ion trapping
a strategy for treatment of poisonings based on the principle that cell membranes are less permeable to ionized compounds. With knowledge of the characteristics of the toxin, treatment can be given to alter the acid-base balance in favor of ionization.
References in periodicals archive ?
Air-stable" is the term used to describe an ion pump that can pump against an air leak without becoming unstable.
Ion pumps have difficulty maintaining operation above 250 [degrees] C because of magnetic field loss and the increased gas load as gases desorb from internal surfaces.
Most components of the analysis system, including the ion pump, were made from 316L vacuum fired stainless steel.
Gettering in its wider meaning was already a concept used in all capture pumps, including cryogenic and sputter ion pumps.
The Diode VacIon Plus pump from Varian Vacuum Products (800-882-7426) is said to have the highest pumping speed among all ion pumps for oxygen, carbon dioxide, carbon monoxide, and other getterable gases, and the highest pumping speed and capacity for hydrogen as well.
NEGs are being used increasingly in combination with ion pumps, especially in very large conductance-limited vacuum systems such as colliders and particle accelerators where both the ion pumps and the NEG pumps are usually built-in and provide a so-called distributed pumping action.
Two additional examples of applications in the field of high-energy physics utilizing NEG pumps as discrete pumping systems in combination with ion pumps are worthy of mention.
Capable of providing especially safe shielded high-voltage connections with models rated to 20 kV, SHV feedthroughs are proving their worth in mass spectrometers, ion pumps, ion sources, and sputtering systems.
The feedthrough is custom-designed to work with ion pumps and surface analysis equipment.
They are designed for applications that now are served by turbo, cryo, diffusion, and ion pumps.