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A going back and forth regularly; used in respect to certain transport processes across a biomembrane.
Any of the five—Columbia, Challenger, Discovery, Atlantis and Endeavour—reusable spacecraft that carried personnel and equipment into orbit, providing platform of the cutting-edge research critical in constructing the largest structure in space, the International Space Station. The first mission was launched in April 1981; the last space shuttle mission, STS-135, ended in July 2011.
To transport an object back and forth; in cell biology or biochemistry, to carry a molecule repeatedly across a cell membrane.
the transport of electrons or organic groups across biological membranes.
means of transfer of reducing equivalents as NADH and H+ from the cytosol to mitochondria. The two main systems are: α-glycerophosphate shuttle and malate-aspartate shuttle.