[1] Measurements of the biogenic hydrocarbons isoprene and 2-methyl-3-buten-2-ol (MBO), their first-, second-, and third-generation photooxidation products methacrolein (MACR), methyl vinyl ketone (MVK), acetone, 2-hydroxy-2-methylpropanal (2-HMPR), glycolaldehyde, hydroxyacetone, methylglyoxal, and glyoxal, and carbon monoxide (CO), were obtained above a ponderosa pine plantation, near the Blo...

Photooxidation of supernatant glutamate aspartate transaminase, limited to the stage during which much of the enzyme activity and only histidine residues are destroyed, does not induce gross protein structural changes as judged by ultracentrifugation, optical rotatory dispersion in the ultraviolet region, and microcomplement fixation techniques. Photooxidized apoenzyme has been shown to bind at...

tion at pH 5.5 resulted in preferential destruction of IC photoreduction ability. 4. Addition of zinc ion preferentially inhibited the photooxidation of ascorbic acid. 5. Treatment of chloroplasts with digitonin resulted in a drastic loss of ability to catalyze the Hill reaction and IC photoreduction, yet yielded a preparation which was over 6 times as active in terms of ascorbic acid photooxid...

A simple method is described for high-resolution light and electron microscopic immunolocalization of proteins in cells and tissues by immunofluorescence and subsequent photooxidation of diaminobenzidine tetrahydrochloride into an insoluble osmiophilic polymer. By using eosin as the fluorescent marker, a substantial improvement in sensitivity is achieved in the photooxidation process over other...

This paper reports a study of photooxidation and photomodification processes of the CdTe/CdS quantum dots embedded in a polymer matrix under ambient condition. During the first few minutes of irradiation, the quasi-inverse increase in photoluminescence intensity has been observed indicating the passivation of the nanocrystal surface traps by water molecules. A prolonged irradiation of the polym...

Oil-derived products can be subjected to conditions that promote oxidation of their unsaturated components during storage and use. The materials arising during oxidation and subsequent degradation can seriously impair the quality and performance of such products [1, 2]. Thus, oxidative stability is an important issue to face before studying their catalytic reactivity. The fatty acid alkyl chain...

Gas-solid heterogeneous photooxidation of toluene over TiO2 catalyst was studied to investigate the factors controlling the catalytic activities. The toluene photooxidation behavior on TiO2 was strongly affected by the formation and oxidation behavior of intermediate compounds on TiO2, and their accumulation decreased the reaction rate for toluene photooxidation. The formation and oxidation beh...

Under field conditions atrazine inhibits C 0 2 fixation but the electron flow seems to be hindered partly only. The remaining capacity of the electron transport chain produces not used reducing electrons. The consequence should be a destructiv photooxidation. T his process however is sup­ pressed by photorespiration. When all possible substrats including stored carbohydrates are m etab­ olized ...