| photoreactivating enzyme | deoxyribodipyrimidine photolyase |
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| photoreactivation | <molecular biology> The repair of DNA that has been damaged by ultraviolet radiation, by the DNA repair enzyme photolyase, which requires the presence of visible light. (31 Dec 1997) |
| photoreceptive | Functioning as a photoreceptor. (05 Mar 2000) |
| photoreceptor | <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) |
| photoreceptor cells | Rod and cone cell's of the retina. (05 Mar 2000) |
| photoreceptors | Cells specialised to detect and transduce light and darkness. Rods and cones are the photoreceptors in the vertebrate retina. (12 Dec 1998) |
| photoreceptors, invertebrate | Cells in invertebrates which are specialised to detect and transduce light and darkness and relay that information centrally in the nervous system. (12 Dec 1998) |
| photoreduction | <biochemistry, plant biology> The light-induced reduction of an electron acceptor during photosynthesis. (31 Dec 1997) |
| photorelief | A printing surface in relief, obtained by photographic means and subsequent manipulations. Source: Websters Dictionary (01 Mar 1998) |
| photorespiration | <plant biology> Increased respiration that occurs in photosynthetic cells in the light, due to the ability of RuDP carboxylase to react with oxygen as well as carbon dioxide. Reduces the photosynthetic efficiency of C3 plants. (31 Dec 1997) |
| photoretinitis | See: photoretinopathy. (05 Mar 2000) |
| photoretinopathy | A macular burn from excessive exposure to sunlight or other intense light (e.g., the flash of a short circuit); characterised subjectively by reduced visual acuity. See: solar maculopathy. Synonym: electric retinopathy, solar retinopathy. Origin: photo-+ retina, + G. Pathos, suffering (05 Mar 2000) |
| photoscan | The record obtained by scintigraphy. See: scan. Synonym: photoscan, scintigram. (05 Mar 2000) |
| photoscope | <instrument, physics> Anything employed for the observation of light or luminous effects. Origin: Photo- + -scope. Source: Websters Dictionary (01 Mar 1998) |
| photoscopic | Of or pertaining to the photoscope or its uses. Source: Websters Dictionary (01 Mar 1998) |
| Photofrin |
A drug used in photodynamic therapy that is absorbed by tumor cells. When absorbed by cancer cells and exposed to light, photofrin becomes active and kills the cancer cells.
출처: www.stjude.org/glossary
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| photosynthesis |
Process by which cells containing chlorophyll in green plants convert incident light to chemical energy and synthesize organic compounds from inorganic compounds, especially carbohydrates from carbon dioxide and water, accompanied by the simultaneous release of oxygen.
출처: amsglossary.allenpress.com/glossary/browse
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| photochemical |
Type of air pollution characterized by high levels of ozone and low visibility, typically found in cities located in a valley (eg, Los Angeles, Denver, Mexico City). Sunlight, oxides of nitrogen, and hydrocarbons (the latter two of which arise from automobile exhaust) are all required in order for smog formation to occur. The most severe episodes occur when a strong temperature inversion caps the location and traps the pollutants. ...
출처: amsglossary.allenpress.com/glossary/browse
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| photochemical smog |
Air contaminated with ozone, nitrogen oxides, and hydrocarbons, with or without natural fog being present. In the presence of sunlight, hydrocarbons and NO x are involved in a complex series of chemical reactions that eventually creates ozone and other oxidants as secondary pollutants. However, ozone is also destroyed by NO x . ...
출처: amsglossary.allenpress.com/glossary/browse
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| photochemistry |
The study of the chemical and physical changes occurring when a molecule or atom absorbs light. These can include photodecomposition, fluorescence, chemiluminescence, and quenching of the excited state. The atmosphere can be considered as a complex photochemical reactor, the chemistry of which is driven by the visible and ultraviolet radiation emanating from the sun.
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