Results 251 to 260 of about 49,559 (307)
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Aqueous Photolysis of Niclosamide
Journal of Agricultural and Food Chemistry, 2004The photodegradation of [(14)C]niclosamide was studied in sterile, pH 5, 7, and 9 buffered aqueous solutions under artificial sunlight at 25.0 +/- 1.0 degrees C. Photolysis in pH 5 buffer is 4.3 times faster than in pH 9 buffer and 1.5 times faster than in pH 7 buffer. In the dark controls, niclosamide degraded only in the pH 5 buffer.
Phillip W, Graebing +3 more
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Rubber Chemistry and Technology, 1947
Abstract Rubber hydrocarbon irradiated in vacuo is decomposed by ultraviolet light of wave length less than 4000 A˚. The rubber very rapidly becomes insoluble, and liberates a gaseous mixture which consists mainly of hydrogen when the irradiation temperature is less than 150° C.
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Abstract Rubber hydrocarbon irradiated in vacuo is decomposed by ultraviolet light of wave length less than 4000 A˚. The rubber very rapidly becomes insoluble, and liberates a gaseous mixture which consists mainly of hydrogen when the irradiation temperature is less than 150° C.
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International Journal of Radiation Biology and Related Studies in Physics, Chemistry and Medicine, 1976
The photoionization of aromatic residues constitutes a major initial photochemical reaction in the flash photolysis of proteins at gamma greater than 250 nm. The ejected electrons have been observed as eaq- and the disulphide bridge electron adduct, and also must be trapped at unidentified sites.
L I, Grossweiner +2 more
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The photoionization of aromatic residues constitutes a major initial photochemical reaction in the flash photolysis of proteins at gamma greater than 250 nm. The ejected electrons have been observed as eaq- and the disulphide bridge electron adduct, and also must be trapped at unidentified sites.
L I, Grossweiner +2 more
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FLASH PHOTOLYSIS OF RIBONUCLEASE A
Photochemistry and Photobiology, 1973Abstract— Flash photolysis spectra show that ultraviolet irradiation of RNase (Λ > 250 nm) at pH 11.5 generates the hydrated electron and a long‐lived transient with absorption maxima at 390 nm and 410 nm, attributed to the phenoxyl type radical from tyrosyl residues.
W A, Volkert, L I, Grossweiner
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Journal of Organometallic Chemistry, 1978
Abstract The synthesis and photochemistry of 1-silyl- and 1-disilanyl-3-trimethylsilyl-3-phenylpropynes, and 1-silyl- and 1-disilanyl-1,3-bis(trimethylsilyl)-3-phenylpropadienes is described. The UV-irradiation of the 1-silyl- and 1-disilanyl-3-trimethylsilyl-3-phenylpropynes with a high-pressure mercury lamp resulted in formation of equilibrium ...
Mitsuo Ishikawa +3 more
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Abstract The synthesis and photochemistry of 1-silyl- and 1-disilanyl-3-trimethylsilyl-3-phenylpropynes, and 1-silyl- and 1-disilanyl-1,3-bis(trimethylsilyl)-3-phenylpropadienes is described. The UV-irradiation of the 1-silyl- and 1-disilanyl-3-trimethylsilyl-3-phenylpropynes with a high-pressure mercury lamp resulted in formation of equilibrium ...
Mitsuo Ishikawa +3 more
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PHOTOLYSIS OF POLYRIBOBROMOURIDYLIC ACID
Photochemistry and Photobiology, 1972Abstract—Photolysis of polyribobromouridylic acid with 313 nm light at neutral pH caused extensive debromination and a loss of A280(280–nm absorbance) without comparable increase in A260. At an exposure of 190μE/cm2, strand breakage occurred on the average of one break every 170 BrU residues. Little if any pyrimidine hydrate was produced.
M, Ehrlich, M, Riley
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TECHNIQUES OF FLASH PHOTOLYSIS*
Photochemistry and Photobiology, 1968Abstract— The design of a typical flash photolysis equipment is considered in detail and the factors limiting the time resolution and the sensitivity are analyzed. The characteristics of low pressure discharge lamps are compared with those of high pressure arcs, of exploding foils and of the electromagnetic ‘pinch’ discharge.
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Nature, 1965
IT is well known that ultra-violet irradiation of proteins can cause changes of physiological importance but, despite the increasing number of publications on aspects of this problem, little is known of the primary processes which must precede or accompany the destruction of the macromolecule.
R B, Johns, T, Jaskewycz
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IT is well known that ultra-violet irradiation of proteins can cause changes of physiological importance but, despite the increasing number of publications on aspects of this problem, little is known of the primary processes which must precede or accompany the destruction of the macromolecule.
R B, Johns, T, Jaskewycz
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THE AQUEOUS PHOTOLYSIS OF TRICLOPYR
Environmental Toxicology and Chemistry, 1993Abstract The aqueous photolysis of triclopyr was examined in both pH 7-buffered water and natural river water under artificial lights and midsummer sunlight (40°N latitude). The pseudo-first-order half-lives in pH 7-buffered water and natural river water averaged 0.5 and 1.3 d, respectively, at 25°C.
Kent B. Woodburn +3 more
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Hydrolysis and Photolysis of Hexachlorocyclopentadiene
Archives of Environmental Contamination and Toxicology, 1996The radioactivity on adding 14C-Hexachlorocyclopentadiene (Hex) to water (7 7gmg/L) decreased by 18% on Day 2 and by 31 to 55% by Day 42. On Day 42, the radioactivity remaining in water consisted of apolar (petroleum ether-extractable), polar (ethyl acetate-extractable), and hydrophilic hydrolysis products with Hex amounting to only 8% of the total ...
A. A. Podowski, M. A. Q. Khan
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