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At pH 9,5 the DNA absorption maximum at 190 nm was shifted to 212 nm. This absorption maximum showed a bathochrome effect in the presence of IAA, GA and KI. The amplitude of this maximum was reduced at the same time. By addition of urea (0.1 —2.0 moles/l) the bathochrome effect, induced by the growth substances, was completely reversed, whereas application of NaCl (0.1 — 2.0 moles/l) did not affect the bathochrome movement of this DNA maximum. At pH 6.0 in the presence of 0.9% NaCl this DNA maximum did not show any visible bathochrome movement in the presence of the growth substances investigated. The DNA maximum at 260 nm did not show any alteration in the presence of growth substances.

zeitschrift für naturforschung b

Untersuchungen über die Bindung pflanzlicher Wuchsstoffe an verschiedene Komponenten des Chromatins in vitro. I. Bindung an DNS / Investigations Upon the Binding of Plant Growth Substances to Several Components of the Chromatin in vitro. I. Binding to DNA