The glycine uptake of Scenedesmus obtusiusculus

Cseh, Edit and Szabó, Ernő (1965) The glycine uptake of Scenedesmus obtusiusculus. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 32. pp. 247-253. ISSN 0365-3005

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Abstract

The uptake of glycine-C¹⁴ by Scenedesmus obtusiusculus has been examined in relation to the period of absorption, the intensity of light and the changes in the glycine concentration of the nutrient solution. It could be concluded on the basis of the time curves made in the light and in darkness that in both cases there was an initial very rapid uptake period followed by a slower linear stage. The stimulatory effect of light began to operate right at the beginning of illumination and lasted until the end of the experiment. Even a minimum light was found to stimulate absorption. Further increase in the intensity of light had neither a stimulatory nor inhibitive influence on uptake. The extent of the stimulatory effect of light is dependent on the medium glycine concentration; there was a slight stimulation at 0.01 mM, but absorption was found to have been increased by more than 100% at 10.0 mM external concentration. Despite the wide concentration interval used during the experiment, pronounced saturation cannot be observed on the concentration curves.

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