Dieter Haaß

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Of nine species of unicellular algae tested, Chlorella vulgaris showed the highest inducibility for an active hexose transport system. Whereas the rate of uptake in all other species was increased by induction less than 5-fold, it was increased more than 400-fold in one strain of C. vulgaris. With glucose as inducer, the minimum time necessary to synthesize(More)
1. Cells of Chlorella vulgaris induced for hexose transport contain a membrane-bound protein component that is missing in non-induced cells. This was shown by double labelling experiments with [14C]phenylalanine and [3H]phenylalanine applying the method of Kolber and Stein [Nature (Lond) 209 (1966) 691]. The specific protein is completely absent from(More)
Tissue cultures originating from different organs i.e. leaves, leaf-stalks, ovaries, anthers, and roots of SYMPHYTUM OFFICINALE were initiated under various growth conditions and subcultured several times to give the first callus generation. From all these calli, whole plants could be regenerated which again were used for the preparation of tissue cultures(More)
Callus derived from Symphytum officinale L. regenerants was cultured in the presence of various phytohormones. The growth rate of callus was stimulated by all phytohormones at various concentrations. With 1-naphthaleneacetic acid no organ differentiation could be observed. With indole-3-butyric acid at low concentrations only roots were formed, whereas(More)
The hemagglutinin (lectin) associated with the cell walls of hypocotyls from Vigna radiata was greatly purified. At every stage in the purification the hemagglutinating activity coincided exactly with α-galactosidase activity. This suggests that, similar to the seed lectin of the same plant, both activities might be present in the same molecule which has a(More)
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