| photosculpture | A process in which, by means of a number of photographs simultaneously taken from different points of view on the same level, rough models of the figure or bust of a person or animal may be made with great expedition. Origin: Photo- + sculpture. Source: Websters Dictionary (01 Mar 1998) |
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| photosensitisation | <dermatology> The development of abnormally heightened reactivity of the skin to sunlight. (13 Oct 1997) |
| photosensitive | 1. An abnormally heightened reactivity of the skin to sunlight. 2. Responding to light, e.g.,,as by a photocell. Origin: photo + L. Sensus, a feeling, fr. Sentio, to feel (05 Mar 2000) |
| photosensitive rash | <dermatology> A rash that occurs from the use of a particular drug when exposed to sunlight. <pharmacology> Medications known to produce a photosensitive skin reaction include: captopril, chlordiazepoxide, furosemide, griseofulvin, oral contraceptives, phenothiazines, sulphonamides, tetracycline, demeclocycline and thiazide diuretics. (13 Oct 1997) |
| photosensitivity | <dermatology> An abnormal cutaneous response involving the interaction between photosensitising substances and sunlight or filtered or artificial light at wavelengths of 280-400 mm. There are two main types: photoallergy and photoxicity. (13 Oct 1997) |
| photosensitivity disorders | Abnormal responses to sunlight or artificial light due to extreme reactivity of light-absorbing molecules in tissues. It refers almost exclusively to skin photosensitivity, including sunburn, reactions due to repeated prolonged exposure in the absence of photosensitizing factors, and reactions requiring photosensitizing factors such as photosensitizing agents and certain diseases. With restricted reference to skin tissue, it does not include photosensitivity of the eye to light, as in photophobia or photosensitive epilepsy. (12 Dec 1998) |
| photosensitization | 1. Sensitization of the skin to light, usually due to the action of certain drugs, plants, or other substances; may occur shortly after administration of the drug (phototoxic sensitivity), or may occur only after a latent period of from days to months (photoallergic sensitivity, or photoallergy). Synonym: photodynamic sensitization. (05 Mar 2000) |
| photosensitizing agents | Drugs that are pharmacologically inactive but when exposed to ultraviolet radiation or sunlight are converted to their active metabolite to produce a beneficial reaction affecting the diseased tissue. These compounds can be administered topically or systemically and have been used therapeutically to treat psoriasis and various types of neoplasms. (12 Dec 1998) |
| photosensor | A device designed to respond to light and to transmit resulting impulses for interpretation, movement, or operating control. See: sensor. (05 Mar 2000) |
| photosensor oculography | Oculography in which photocells are directed to the surface of the eye to record rotations. (05 Mar 2000) |
| photostable | Not subject to change upon exposure to light. (05 Mar 2000) |
| photostethoscope | <instrument> Device that converts sound into flashes of light; used for continuous observation of the foetal heart. (05 Mar 2000) |
| photostimulable phosphor | The chemical coating the phosphor plate in a computed radiography system; the latent image is recovered by laser scanning. (05 Mar 2000) |
| photostress | Exposure to intense illumination. See: photostress test. (05 Mar 2000) |
| photostress test | Measurement of visual acuity before and after exposure of the eyes to intense light. (05 Mar 2000) |
| photolabile |
A chemical that is easily dissociated by the absorption of light, usually in the visible or ultraviolet region. An example of a photolabile species is nitrous acid, HONO, which has a very short lifetime in sunlight.
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| photolysis |
The process by which a chemical species undergoes a chemical change as the result of the absorption of a photon of light energy. See also photodecomposition, photochemical reaction, photooxidation.
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| photometer |
An instrument for measuring the luminance, luminous intensity, or illuminance of a light source. Analogous to radiometer, but with an output weighted by the wavelength response of the human eye (ie, scaled by luminous efficiency). It is common in historical literature to see this term used for any radiometer that responds primarily to wavelengths that are visible to the human eye, with or without scaling for luminous efficiency. ...
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| photometry |
The measurement of the visual aspect of radiant energy (light). As such, it is distinguished from radiometry in that photometry takes into account the varying sensitivity of the eye to different wavelengths of light.
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| photoperiod |
Day length or duration of daily exposure to light and dark periods, either natural or artificially manipulated.
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