Abstract
The rapid uptake of sucrose-C14from the surrounding medium by resting cells of Agrobacterium tumefaciens is strongly inhibited in a competitive manner by D-glucose, D-galactose, D-xylose, D-fucose, and L-arabinose while their enantiomorphs do not inhibit. It has been possible to formulate specific structural requirements for the monosaccharides which are necessary to produce such powerful inhibitory effects of sucrose uptake.Strong inhibition has also been obtained with 3-ketoglucose, 3-ketosucrose, 3-ketomaltose, 3-ketolactose, and 3-ketotrehalose, as well as with the disaccharides maltose and cellobiose. In these cases, however, specific structural requirements for inhibition have not been determined as yet.

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