pump (redirected from Proton pump)

pump (pump)

1. an apparatus for drawing or forcing liquids or gases.

2. to draw or force liquids or gases.

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breast pump  a manual or electric pump for abstracting breast milk.

calcium pump  the mechanism of active transport of calcium (Ca2+) across a membrane, as of the sarcoplasmic reticulum of muscle cells, against a concentration gradient; the mechanism is driven by enzymatic hydrolysis of ATP.

intra-aortic balloon pump  (IABP) a pump used in intra-aortic balloon counterpulsation.

proton pump  a system for transporting protons across cell membranes, often exchanging them for other positively charged ions.

sodium pump , sodium-potassium pump the mechanism of active transport, driven by hydrolysis of ATP, by which sodium (Na+) is extruded from a cell and potassium (K+) is brought in, so as to maintain gradients of these ions across the cell membrane.

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pump (pmp)

n.

1. A machine or device for raising, compressing, or transferring fluids.

2. A molecular mechanism for the active transport of ions or molecules across a cell membrane.

v.

1. To raise or cause to flow by means of a pump.

2. To transport ions or molecules against a concentration gradient by the expenditure of chemically stored energy.

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pump

1. an apparatus for drawing or forcing liquid or gas.

2. to draw or force liquids or gases.

3. a mechanism or structure that mediates active transport of ions or molecules across a biological membrane.

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blood pump

a machine used to propel blood through the tubing of extracorporeal circulation devices.

calcium pump

the mechanism of active transport of calcium (Ca²⁺) across a membrane, as of the sarcoplasmic reticulum of muscle cells, against a concentration gradient; the mechanism is driven by hydrolysis of ATP.

infusion pump

an electronic device used to control the administration of intravenous fluids in very small amounts and at a carefully regulated rate over long periods.

pump oxygenator

heart-lung machine. See extracorporeal circulatory support unit.

sodium pump, sodium-potassium pump

the mechanism of active transport driven by hydrolysis of ATP, by which sodium (Na+) is extruded from a cell and potassium (K+) is brought in, so as to maintain the low concentration of Na+ and the high concentration of K+ within the cell with respect to the surrounding medium. See also na+,k+-atpase.

stomach pump

an apparatus used to remove material from the stomach. It consists of a rubber stomach tube to which a bulb syringe is attached. The tube is inserted into the mouth or nose and passed down the esophagus into the stomach. Suction from the syringe brings the contents of the stomach up through the tube. For cattle and horses a reversible metal pump adapted from a yachting bilge pump is most suitable. In small animals, gravity is the usual method of moving fluid into and out of the stomach during lavage.