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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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686Maggenti and Gardnerphotokinesis n. [Gr. phos, light; kinesis, movement] A kinesisin response to stimulation by visual cognizance.photophil n. [Gr. phos, light; philos, loving] Light-loving. seephengophil.photophobic, photophobe a. [Gr. phos, light; phobos, fear]Shunning or avoiding light. see lucifugous, lucipetal,phengophobe.photophobotaxis n. [Gr. phos, light; phobos, fear; taxis, arrangement]Movement involved in the avoidance <strong>of</strong> light;negative tropism.photophore n. [Gr. phos, light; pherein, to bear] A light producingorgan <strong>of</strong> certain marine Hydrozoa, Crustacea andCephalopoda.photopic see apposition eyephotoreactivation reaction Partial reversal <strong>of</strong> damage tobiological systems by ultraviolet light by longer wave lengthlight.photoreceptor n. [Gr. phos, light; L. receptor, receiver] Asense organ responsive to light.photosynthesis n. [Gr. phos, light; synthesis, place together]The formation <strong>of</strong> carbohydrates from carbon dioxide andwater by the absorption <strong>of</strong> light by chlorophyll.phototaxis n. [Gr. phos, light; taxis, arrangement] Themovement in response to the stimulus <strong>of</strong> light. see heliotaxis.phototelotaxis n. [Gr. phos, light; telos, end; taxis, arrangement]The direct movement <strong>of</strong> an animal toward shade.phototonus n. [Gr. phos, light; tonos, tension] 1. Sensitivenessto light. 2. Muscle tonus stimulated by light.phototropism n. [Gr. phos, light; tropos, turn] Movement determinedby the direction <strong>of</strong> incident light. photropic a.phragma n.; pl. -mata [Gr. phragmos, fence] 1. An inwardlyextending process. 2. (ARTHRO: Insecta) In winged forms,an internal plate or invagination <strong>of</strong> the dorsal wall for theattachment <strong>of</strong> muscles. phragmatal a. see prephragma,postphragma.

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