Results 301 to 310 of about 32,454 (332)
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Journal of Photochemistry and Photobiology B: Biology, 1988
The human eye is constantly exposed to sunlight and artificial lighting. Therefore the eye is exposed to UV-B (295-320 nm), UV-A (320-400 nm), and visible light (400-700 nm). Light is transmitted through the eye and then signals the brain directing both sight and circadian rhythm. Therefore light absorbed by the eye must be benign.
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The human eye is constantly exposed to sunlight and artificial lighting. Therefore the eye is exposed to UV-B (295-320 nm), UV-A (320-400 nm), and visible light (400-700 nm). Light is transmitted through the eye and then signals the brain directing both sight and circadian rhythm. Therefore light absorbed by the eye must be benign.
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Ophthalmology Clinics of North America, 2001
Although the occurrence of iatrogenic light-induced retinal toxicity is beyond doubt, several issues remain to be studied further. These include conflicting reports regarding the wavelength of light that is most hazardous; what mechanism contributes more significantly in the pathogenesis of light-induced retinal toxicity-photochemical or photothermal ...
L, Verma, P, Venkatesh, H K, Tewari
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Although the occurrence of iatrogenic light-induced retinal toxicity is beyond doubt, several issues remain to be studied further. These include conflicting reports regarding the wavelength of light that is most hazardous; what mechanism contributes more significantly in the pathogenesis of light-induced retinal toxicity-photochemical or photothermal ...
L, Verma, P, Venkatesh, H K, Tewari
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Phototoxicity and photoallergy
Seminars in Cutaneous Medicine and Surgery, 1999Photosensitivity may be phototoxic or photoallergic. Phototoxicity is much more common. There are 2 types of phototoxicity: photodynamic, which requires oxygen, and nonphotodynamic, which does not. Reactions induced by porphyrin molecules, coal tar derivatives, and many drugs are photodynamic.
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New England Journal of Medicine, 1985
Publisher Summary The effect of non-ionising radiation on a cell depends on the specific chemical composition within the cell, that is, on the presence of absorbing molecules or chromophores. This type of radiation must be absorbed to cause a change in the molecule as absorbed energy is required to promote a chemical change.
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Publisher Summary The effect of non-ionising radiation on a cell depends on the specific chemical composition within the cell, that is, on the presence of absorbing molecules or chromophores. This type of radiation must be absorbed to cause a change in the molecule as absorbed energy is required to promote a chemical change.
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Phototoxic Furanoquinolines of the Rutaceae
Planta Medica, 1981Dictamnine, isodictamnine, 7-demethylskimmianine, maculosidine and maculine were shown to be phototoxic to certain bacteria and yeasts in long wave UV light. Dose response curves with dictamnine and 8-methoxypsoralen in UV light were compared using E. COLI and SACCHAROMYCES CEREVISIAE.
E. A. Graham +3 more
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Ophthalmology, 1985
In conjunction with ultraviolet filtration and to further minimize the risk of phototoxic retinal damage during anterior segment surgery, the operation microscope has been modified to eliminate on demand all light entering the eye by eclipsing the pupil when the red reflex is not required. Retinal light exposure may be reduced as much as 75%.
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In conjunction with ultraviolet filtration and to further minimize the risk of phototoxic retinal damage during anterior segment surgery, the operation microscope has been modified to eliminate on demand all light entering the eye by eclipsing the pupil when the red reflex is not required. Retinal light exposure may be reduced as much as 75%.
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MECHANISMS OF CITRAL PHOTOTOXICITY
Photochemistry and Photobiology, 1992Abstract—Citral, a monoterpene aldehyde synthesized by several plant genera, has been reported to exhibit antimicrobial activity. For the first time, we report that citral exhibits UV‐A (315–400 nm) light enhanced oxygen‐dependent toxicity against a series of Escherichia coli strains differing in DNA repair and catalase proficiency. Those E.
Archana Asthana +3 more
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Shades of phototoxicity in fluorescent imaging agents (that are not supposed to be phototoxic)
Photochemistry and Photobiology, 2023AbstractThis article is a highlight of the paper by Huang et al. in this issue of Photochemistry and Photobiology. It describes shades of phototoxicity in fluorescent imaging agents that are not intended to be phototoxic. Phototoxicity was assessed using a modified neutral red uptake (NRU) in vitro assay with mean photo‐effects (MPE) for the ...
Serah Essang, Alexander Greer
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Phototoxicity of olaquindox in the rat
Research in Veterinary Science, 1990Because of its photoallergic properties quindoxin, a growth promoting feed additive used for example in cattle raising, has been taken off the market. Recently, it appeared that the quindoxin derived olaquindox (OLAQ), used for the same purpose, also produces these light-induced side effects.
M.H.J. Berkhuysen +3 more
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Ocular fluorescein phototoxicity
Applied Optics, 1987Fluorescein angiography is one of the most commonly used diagnostic techniques in modern ophthalmology. Prior to this study, recommendations on the phototoxicity of this technique were based on light levels alone (i.e., without fluorescein present). Using a rabbit model to demonstrate retinal damage, intravenous sodium fluorescein was found to reduce ...
Bernard F. Hochheimer +2 more
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