photopositiveadj.n.

1914 S. O. Mast in Biol. Zentralblatt 34 662 In place of positively or negatively phototropic, geotropic, etc., we might use photo-, geo-, negative or positive, etc.

1923 Jrnl. Exper. Zool. 28 194 The photopositive reactions of insects under normal conditions usually result in their escape from places of danger.

1964 Oceanogr. & Marine Biol. 2 482 The larvae may settle or may resume their pelagic existence, again becoming photopositive for a short time.

1997 G. S. Helfman et al. Diversity of Fishes ix. 129/1 Emergence occurs as these responses reverse to photopositive and geonegative, causing them to swim up and out of the gravel but still into the current.

1915 Physical Rev. 5 62 For certain regions of the spectrum these cells were photo-negative, while for longer wave-lengths they were photo-positive.

1932 A. L. Hughes & L. A. DuBridge Photoelectr. Phenomena viii. 328 The effect of light [on photoconducting substances] is usually to increase the conductivity (the photopositive effect..), but occasionally it is found that light apparently diminishes the conductivity (the photonegative effect).

1972 U.S. Patent 3,660,680 1/2 The photosensitive device also has a photopositive resistive element..to assume a high impedance condition whenever the radiant energy source emits no radiant energy.

1965 Science 7 May 767/1 A publication subsystem that converts retrieved citations, and descriptors characterizing these citations, into photopositive film.

1967 Proc. Royal Soc. B. 168 34 The next generation comes from the 20 photopositives from no. 16 and five geopositives transferred from no. 15.

1978 Soviet Jrnl. Optical Technol 45 66 Adequate or proportional transfers of the radiance or luminance intervals of a subject onto a photopositive are never actually achieved.

1983 Hybrid Circuits Spring 21 The requirements for the artwork and photopositive are examined, with recommended procedures for exposing and processing the mask.

1995 Trans. ASME Jrnl. Electronic Packaging 117 266 The 3D image is created by first making several..micrographs of the cross-section of the joint until the whole joint has been examined. The photopositives are then scanned with a black and white scanner.

1946 Nature 13 July 58/2 When behaving photopositively Hydra orientates itself klinokinetically.

1993 Ethol., Ecol. & Evol. 5 87 Tested with monochromatic lights, the laboratory-born individuals reacted in the main photopositively.