| shuttle vector | <molecular biology> Cloning vector that replicate in cells of more than one organism, for example E. Coli and yeast. This combination allows DNA from yeast to be grown in E. Coli and tested directly for complementation in yeast. Shuttle vectors are constructed so that they have the origins of replication of the various hosts. (18 Nov 1997) |
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| malate-aspartate shuttle | A mechanism for the transfer of NADH reducing equivalents from the cytosol into the mitochondria using two isozymes of malate dehydrogenase and aspartate transaminase. (05 Mar 2000) |
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| glycerophosphate shuttle | A mechanism for the transfer of reducing equivalents from the cytosol into the mitochondria; NADH is used to synthesise glycerol 3-phosphate in the cytosol; this compound is then transported into the mitochondria where it is converted to dihydroxyacetone phosphate (DHAP) using FAD; DHAP then returns to the cytosol to complete the cycle; found in brain tissue, brown adipose tissue, and white muscle. (05 Mar 2000) |
| shuttle | 1. An instrument used in weaving for passing or shooting the thread of the woof from one side of the cloth to the other between the threads of the warp. "Like shuttles through the loom, so swiftly glide My feathered hours." (Sandys) 2. The sliding thread holder in a sewing machine, which carries the lower thread through a loop of the upper thread, to make a lock stitch. 3. A shutter, as for a channel for molten metal. Shuttle box, any one of numerous species of marine gastropods of the genus Volva, or Radius, having a smooth, spindle-shaped shell prolonged into a channel at each end. Origin: Also shittle, OE. Schitel, scytyl, schetyl; cf. OE. Schitel a bolt of a door, AS. Scyttes; all from AS. Sceotan to shoot; akin to Dan. Skyttel, skytte, shuttle, dial. Sw. Skyttel, skottel. See Shoot, and cf. Shittle, Skittles. Source: Websters Dictionary (01 Mar 1998) |
| shuttle flow | <cell biology> Bulk flow of the cytoplasm of cells. most conspicuous in large cells such as amoebae and the internodal cells of Chara where the rate of movement may be as high as 100 m/sec. See: cyclosis. (18 Nov 1997) |
| biological vector | A vector, such as the Anopheles mosquito for malarial agents or the tsetse fly for agents of African sleeping sickness, in which the agent multiplies prior to being transmitted to another host. (05 Mar 2000) |
| radius vector | 1. <mathematics> A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates. See Coordinate. 2. <astronomy> An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite. Source: Websters Dictionary (01 Mar 1998) |
| vector | 1. <mathematics> A term to describe something that has both direction and magnitude. 2. <molecular biology> Commonly term for a plasmid that can be used to transfer DNA sequences from one organism to another. Different vectors may have properties particularly appropriate to give protein expression in the recipient or for cloning or may have different selectable markers. Recombinant DNA systems especially suited for production of large quantities of specific proteins in bacterial, yeast, insect, or mammalian cell systems. See: transfection. (05 Mar 2000) |
| vector-borne | Denoting a disease or infection that is transmitted by an invertebrate vector. (05 Mar 2000) |
| vector loop | <physiology> An irregular, usually elliptical, curve representing the average direction and magnitude of the heart's action from moment to moment throughout the cardiac cycle. See: vector, vectorcardiogram. (06 Mar 2000) |
| mammalian expression vector | <molecular biology> A vector that will produce large amounts of eukaryotic protein taxonomy notwithstanding, and not necessarily a protein from a mammal. (20 Mar 1998) |
| manifest vector | Projection of a spatial cardiac vector on a single plane. (05 Mar 2000) |
| recombinant vector | A vector into which a foreign DNA has been inserted. Synonym: vector. (05 Mar 2000) |
| mean manifest vector | A single cardiac vector representing the average of all vector's present during a given time interval. Synonym: mean manifest vector. (05 Mar 2000) |
| mean vector | A single cardiac vector representing the average of all vector's present during a given time interval. Synonym: mean manifest vector. (05 Mar 2000) |
| viral vector | <molecular biology> Viral DNA that has been modified to serve as a vector for recombinant DNA. (11 Nov 1997) |