phototropyn.

1892 Jrnl. Royal Microsc. Soc. 513 The phenomena of phototropy—i.e. positive or negative heliotropic movements.

1957 Jrnl. Ecol. 45 724 Phototropy was investigated by exposing the same series of species..to a unilateral supply of daylight for two months.

1971 U. K. LeGuin Vaster than Empires & more Slow in E. S. Rabkin Sci. Fiction: Hist. Anthol. (1983) 499 He could share lust with a white rat, pain with a squashed cockroach, and phototropy with a moth.

1900 Sci. Amer. 24 Feb. 123/2 To these phenomena the experimenter gives the name of phototropy.

1929 Science 30 Aug. (Sci. News Suppl.) p. xiv/2 A man's puzzlement over a fence post which he had painted black but which turned white every night was the starting point of a program of research which has culminated in the discovery of a number of chemicals having this remarkable chameleon-like property scientifically termed phototropy.

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.

1998 Copyright 1998 Chem. Business Newsbase (Nexis) 5 June The product, which is dischargeable, has high solubility and exceptionally high build-up on cotton and viscose. It is not subject to phototropy.