phototropy
(fəʊˈtɒtrəpɪ)
[ad. G. phototropie (W. Marckwald 1899, in Zeitschr. f. physik. Chem. XXX. 140), f. Gr. ϕωτο- (see photo-) + -τροπία turning.]
= photochromism, phototropism 2.
| 1900 Sci. Amer. 24 Feb. 123/2 To these phenomena the experimenter gives the name of phototropy. 1929 [see phototropic a. 2]. 1949 Thorpe's Dict. Appl. Chem. (ed. 4) IX. 585/2 There is evidence..that phototropy is not a purely physical phenomenon. 1954 Jrnl. Amer. Chem. Soc. LXXVI. 3846/1 Observations on the phenomenon of phototropy in alkaline earth titanates. 1971 R. L. M. Allen Colour Chem. iii. 23 The stereoisomerism of azo dyes is of practical importance..in that it gives rise to the phenomenon of phototropy. |