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- W2433073477 abstract "Sugar-depleted excised maize (Zea mays L.) root tips were used to study the kinetics and the specificity of hexose uptake. It was found that difficulties induced by bulk diffusion and penetration barriers did not exist with root tips. Several lines of evidence indicate the existence of a complex set of uptake systems for hexoses showing an overall biphasic dependence on external sugar concentrations. The results suggest that the high and the low affinity components might be located on the same carrier. One uptake system was specific for fructose, but the high affinity component was repressed by high concentrations of external glucose. A second system was speciflic for glucose and its analogs (2-deoxy-D-glucose and 3-0-methyl-D-glucose), and a third one, more complex, had a high affinity for glucose and its analogs but could transport fructose when glucose was not present in the external solution. A simple method is proposed to determine the inhibitor constants in competition experiments. The seminal maize root tip has few carbohydrate reserves but is a strong sink for sugars. Therefore, its energy metabolism, either in normoxia through oxidative phosphorylation (18), or in anoxia through fermentation ( 19), is controlled by the level of sugar supply. The respiratory rate in sugar-depleted tips can be" @default.
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- W2433073477 date "1988-01-01" @default.
- W2433073477 modified "2023-09-27" @default.
- W2433073477 title "Characterization of the Hexose Transport System in" @default.
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