| photobacterium | A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that are common in the marine environment and on the surfaces and in the intestinal contents of marine animals. Some species are bioluminescent and are found as symbionts in specialised luminous organs of fish. (12 Dec 1998) |
|---|---|
| Photobacterium harveyi | lucibacterium harveyi |
| Photobacterium phosphoreum | A luminescent species found on dead fish and in sea water; it is the type species of the genus Photobacterium. (05 Mar 2000) |
| photobiology | The branch of biology which deals with the effect of light on living organisms. (12 Dec 1998) |
| photobiotic | <biology> Requiring light to live; incapable of living without light; as, photobiotic plant cells. Origin: Photo- + biotic. Source: Websters Dictionary (01 Mar 1998) |
| photobleach | To lose colour or make white by the action of light; e.g., the use of a laser to bleach a fluorescent dye covalently linked to a macromolecule. (05 Mar 2000) |
| photobleaching | <biochemistry> Light induced change in a chromophore, resulting in the loss of its absorption of light of a particular wavelength. A problem in fluorescence microscopy where prolonged illumination leads to progressive fading of the emitted light because less of the exciting wavelength is being absorbed. (18 Nov 1997) |
| photocatalyst | A substance that helps bring about a light-catalyzed reaction; e.g., chlorophyll. Origin: photo-+ G. Katalysis, dissolution (catalysis) (05 Mar 2000) |
| photoceptor | <cell biology> A specialised cell type in a multicellular organism that is sensitive to light. This definition excludes single celled organisms, but includes noneye receptors, such as snake infra red (heat) detectors or photosensitive pineal gland cells. See: retinal rods, retinal cones. (31 Dec 1997) |
| photochemical | <chemistry> Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina. Origin: Photo- + chemical. Source: Websters Dictionary (01 Mar 1998) |
| photochemistry | <chemistry> The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography. Origin: Photo- + chemistry. Source: Websters Dictionary (01 Mar 1998) |
| photochemotherapy | Therapy using oral or topical photosensitizing agents with subsequent exposure to light. (12 Dec 1998) |
| photochromatic | Of or pertaining to photochromy; produced by photochromy. Source: Websters Dictionary (01 Mar 1998) |
| photochromic | Of or pertaining to photochromy; produced by photochromy. Source: Websters Dictionary (01 Mar 1998) |
| photochromic lens | A light-sensitive spectacle lens that reduces light transmission in sunlight and increases transmission in reduced light. (05 Mar 2000) |