| photo cell | A light-detecting electronic device; the device that measures X-ray transmission through a patient for automatic termination of the exposure. (05 Mar 2000) |
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| photo- | Phot- Light. Origin: G. Phos (phot-) (05 Mar 2000) |
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| photo-electrotype | An electrotype plate formed in a mold made by photographing on prepared gelatine, etc. Source: Websters Dictionary (01 Mar 1998) |
| photo-engraving | The process of obtaining an etched or engraved plate from the photographic image, to be used in printing; also, a picture produced by such a process. Origin: Photo- + engraving. Source: Websters Dictionary (01 Mar 1998) |
| photo-epinasty | <botany> A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light. See: Photo-, and Epinastic. Source: Websters Dictionary (01 Mar 1998) |
| photo-patch test | A test of contact photosensitization: after application of a patch with the suspected sensitiser for 48 hours to two sites, if there is no reaction one area is exposed to a weak erythema dose of sunlight or ultraviolet light; if positive, a more severe reaction with vesiculation develops at the exposed patch area than the nonexposed skin patch site. (05 Mar 2000) |
| deoxyribodipyrimidine photo-lyase | <enzyme> An enzyme in yeast that is activated by light, whereupon it can reverse a previous photochemical reaction by cleaving the cyclobutane ring of the thymine dimer. It catalyses the reactivation by light of UV-irradiated DNA and cleaves two carbon-carbon bonds in pyrimidine dimers in DNA. Synonym: dipyrimidine photolyase, photoreactivating enzyme. Chemical name: Deoxyribocyclobutadipyrimidine pyrimidine-lyase Registry number: EC 4.1.99.3 (21 Jun 2000) |
| T-cell-rich, B-cell lymphoma | <tumour> A B-cell lymphoma in which more than 90% of the cells are of T-cell origin, masking the large cells that form the neoplastic B-cell component. See: adult T-cell lymphoma. (05 Mar 2000) |
| absorption cell | A small glass chamber with parallel sides, in which absorption spectra of solutions can be obtained. (05 Mar 2000) |
| acid cell | One of the cell's of the gastric glands; it lies upon the basement membrane, covered by the chief cell's, and secretes hydrochloric acid that reaches the lumen of the gland through fine intracellular and intercellular canals (canaliculi). Synonym: acid cell, oxyntic cell. (05 Mar 2000) |
| acidophil cell | A cell whose cytoplasm or its granules stain with acid dyes. (05 Mar 2000) |
| acinar cell | Any secreting cell lining an acinus, especially applied to the cell's of the pancreas that furnish pancreatic juice and enzymes to distinguish them from the cell's of ducts and the islets of Langerhans. Synonym: acinous cell. (05 Mar 2000) |
| acinar cell tumour | A solid and cystic tumour of the pancreas, occurring in young women; tumour cells contain zymogen granules. (05 Mar 2000) |
| acinic cell adenocarcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| acinic cell carcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| acinous cell | Any secreting cell lining an acinus, especially applied to the cell's of the pancreas that furnish pancreatic juice and enzymes to distinguish them from the cell's of ducts and the islets of Langerhans. Synonym: acinous cell. (05 Mar 2000) |