| 单词 |
photosensitization |
| 释义 |
ˌphotosensitiˈzation
[f. photo- 1 + sensitization.]
a. Chem. The initiation of a reaction by light acting on a suitable photosensitizer.
1924H. S. Taylor Treat. Physical Chem. II. xviii. 1241 Uranium salts are positive catalysts for the photoreaction, presumably by photo-sensitization. 1933Jrnl. Amer. Chem. Soc. LV. 587 A maximum of twenty per cent. photosensitization to visible light was found for the polymerization among seventy organic substances tried. 1974D. R. Arnold et al. Photochem. vi. 133 Photosensitization involves the absorption of radiation by a strongly absorbing substance, the photosensitizer and its collisional transfer to another substance which is non-absorbing at the same wavelength.
b. (The production of) a condition in which light of certain wavelengths is harmful to an individual, usu. owing to the presence in the body of a photodynamic substance.
1926E. Mayer Clin. Applic. Sunlight v. 86 (heading) Photosensitization. 1927K. M. L. Gamgee Artificial Light Treatm. Children xii. 108 Experimental photosensitization in animals and human beings is known to follow the administration of certain substances, such as eosin and haematoporphyrin, and death may result on exposure to light. 1941H. F. Blum Photodynamic Action xv. 159 Mathews..finds part of the symptoms which follow feeding on Agave lechuguilla, found in the arid regions of New Mexico, Mexico and Texas, to result from photosensitization. 1961Lancet 26 Aug. 450/2 In cases of porphyria with photosensitization, it is often uroporphyrin which is present in greatest excess, and the response to irradiation is by erythema and itching followed by slowly developing œdema. 1973Stout & Schultes in L. P. Miller Phytochem. III. xiv. 384 These last [sc. photodynamic toxins] may act either by sensitizing the animal directly..or by causing liver damage, which then leads to photosensitization as a secondary consequence. |
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