نتایج جستجو برای: benzoquinone bq
تعداد نتایج: 6906 فیلتر نتایج به سال:
The impregnation of size-controlled gold nanoparticles (AuNPs) on an anatase TiO2 structure ([email protected]2) was studied for the photoelectrochemical detection hydroquinone (HQ) under visible light illumination integrated into a flow injection analysis (FIA) setup. crystalline form preserved during synthesis and homogeneous distribution AuNPs over confirmed. Its photoelectrocatalytic activi...
The measurements of activity concentration of uranium, thorim and potassium were carried out in radiation shielding bricks, granites, soil, hematite, bricks, and sand by using a high resolution high purity Germanium (HPGe) gamma-ray spectrometer system. The activity concentrations of uranium, thorium and potassium contents are 80 ± 5 Bq/kg, 103±10 Bq/kg and 1014±15 Bq/kg, respectively in radiat...
The development of new anti-ureolytic compounds is great interest due to the newly discovered role urease inhibitors in crop protection. Purine degradation and generation ammonium by are required for full virulence biotrophic hemibiotrophic fungal plant pathogens. Accordingly, chemicals displaying inhibitor activity may be used as a novel class fungicides. Several belonging different chemical c...
The role of the quinone group in the antitumor activity of quinone alkylating agents, such as mitomycin C and 2,5-diaziridinyl-3,5-bis(carboethoxyamino)-1,4-benzoquinone, is still uncertain. The quinone group may contribute to antitumor activity by inducing DNA strand breaks through the formation of free radicals and/or by influencing the alkylating activity of the quinone alkylators. The cytot...
OBJECTIVES Although betel quid (BQ) is an established risk factor of head and neck cancer (HNC), insufficiencies exist in the literature regarding the dose-response, BQ types, HNC sites, and BQ cessation. The current study was conducted to fill these insufficiencies. MATERIALS AND METHODS A hospital-based case-control study was conducted to evaluate the association between BQ and HNC. In-pers...
The role of the quinone group in the antitumor activity of quinone alkylating agents, such as mitomycin C and 2,5-diaziridinyl-3,5bis(carboethoxyamino)-l,4-benzoquinone, is still uncertain. The quinone group may contribute to antitumor activity by inducing DNA strand breaks through the formation of free radicals and/or by influencing the alkylating activity of the quinone alkylators. The cytoto...
Selective oxidation is still a challenge for targeted conversion of biomass derived substance to high-value added products. Herein we report an efficient electrochemical strategy transform phenol into p-benzoquinone, by tandem oxidations CuSO4 and CoSO4 catalysts in electrolyte. Co3+ generated at the anode from Co2+ diffuses solution reacts with form hydroquinone, which subsequently oxidized Cu...
Solid tumors have been reported in the Zymbal gland, oral and nasal cavities, liver, and mammary gland of Sprague-Dawley rats following chronic, high-dose administration of benzene. The carcinogenic activity of benzene is thought to be caused by activation to toxic metabolites that can interact with DNA, forming covalent adducts. A nuclease P1-enhanced 32P-postlabeling assay, having a sensitivi...
The endothelin antagonist BQ-123, an anionic cyclopentapeptide, is taken up by rat hepatocytes through active transport systems. Here, we have examined the hepatocellular uptake mechanism for several BQ-123 derivatives with anionic charges using isolated rat hepatocytes. BQ-485, a linear peptide, BQ-518, a cyclic peptide, and compound A, a cyclic peptide with a cationic moiety, were taken up by...
Production of chlorinated quinoid metabolites was investigated in the livers of Sprague-Dawley rats and B6C3F1 mice following single oral administration of pentachlorophenol (PCP) (0-40 mg/kg body weight) and in male Fischer 344 rats, following chronic ingestion of PCP at 1,000 ppm in the diet for 6 months (equivalent to 60 mg PCP/kg body weight/day). Analyses of the rates of adduction in the l...
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