shuttle

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shut·tle

(shŭt'ĕl),
A going back and forth regularly; used in respect to certain transport processes across a biomembrane.

shuttle

Space medicine
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.

shuttle

(shŭt′l)
To transport an object back and forth; in cell biology or biochemistry, to carry a molecule repeatedly across a cell membrane.

shuttle

the transport of electrons or organic groups across biological membranes.

shuttle system
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.
References in classic literature ?
The king likewise heard the noise of the shuttle in the loom and the sweet melody of the beautiful woman's song, and then the pleasant voices of herself and the four maidens talking together, with peals of merry laughter intermixed.
Where had been formerly but the click of the shuttle was soon the roar of 'power,' handlooms were pushed into a corner as a room is cleared for a dance; every morning at half-past five the town was wakened with a yell, and from a chimney-stack that rose high into our caller air the conqueror waved for evermore his flag of smoke.
The poem swung in majestic rhythm to the cool tumult of interstellar conflict, to the onset of starry hosts, to the impact of cold suns and the flaming up of nebular in the darkened void; and through it all, unceasing and faint, like a silver shuttle, ran the frail, piping voice of man, a querulous chirp amid the screaming of planets and the crash of systems.
And through it all, a flying shuttle, weaving the golden dazzling thread of personality, moved the form of her little, indomitable mother, eight years old, and nine ere the great traverse was ended, a necromancer and a law-giver, willing her way, and the way and the willing always good and right.
Occasionally, there is a drowsy sound from some lone weaver's shuttle, or shoemaker's last, but it is stifled by the thick walls and heavy dungeon-door, and only serves to make the general stillness more profound.
The 20-passenger shuttles are air-conditioned, wheelchair accessible and have bike racks and storage space for backpacks and picnic baskets.
NASA has announced that its shuttles will not fly again until engineers have identified and solved the foam-shedding problem.
After half the cores have been injected on one cycle, the core half of the mold shuttles to the left or right so that the fresh preforms mate with the cooling cells.
Since the maiden flight of Space Shuttle Columbia in 1981, the SSMEs have powered the shuttles into orbit to perform a number of important scientific missions.
Three billion dollars have been allocated for another shuttle, even as new plans are dranw to hardly use shuttles at all.
While seven shuttles were originally contemplated, Atlantis was the last in the budget until the 1986 destruction of Challenger led to the creation of Endeavour from spare parts.