The structural properties of 4-substituted phenols capable of proton-coupled electron transfer (PCET) to superoxide (O2 ) were investigated on the basis of electrochemical and electron spin resonance (ESR) spectral measurements and supported by density functional theory calculations. Although the proton and electron donating abilities of phenols are considered to be important factors in PCET re...

(31 %), m-nitrophenol (9%), p-nitrophenol (9%), m-aminophenol (4%), o-aminophenol (3 %), 4nitrocatechol (0.7 %), aniline (033%) and o-nitrophenol (0.1%). Two new metabolites, nitroquinol (0.1%) and p-nitrophenylmercapturic acid (0.3%), were found in the urine. 4. The denitration products, phenol, catechol, L-phenylmercapturic acid, and trans-tran8-muconic acid, did not occur in the urine. 5. Ni...

Dioxygen activation implemented by nonhaem Fe(II) enzymes containing the 2-His-1-carboxylate facial triad has been extensively studied in recent years. Extradiol dioxygenase is the archetypal member of this superfamily and catalyzes the oxygenolytic ring opening of catechol analogues. Here, the crystallization and preliminary X-ray analysis of 2-aminophenol 1,6-dioxygenase, an enzyme representi...

The high yielding transformations of 3,4,4,5-tetrachloro-4H-1,2,6-thiadiazine into 3,5-dichloro-4H-1,2,6-thiadiazin-4-one (up to 85%) and 2-(3,5-dichloro-4H-1,2,6-thiadiazin-4-ylidene)malononitrile (up to 83%) have been investigated and compared to the analogous transformations of the closely-related 4,5-dichloro-1,2,3-dithiazolium chloride (Appel's salt) into 4-chloro-5H-1,2,3-dithiazol-5-one ...

A novel electrochemical sensor was constructed by employing zirconium based metal organic framework (NH 2 -UiO-66) and walnut derived carbon (WC) as modified materials for the highly sensitive selective determination of paracetamol (Para) para-aminophenol (PAP). Characterization results texture properties NH -UiO-66/WC nanocomposite revealed that dispersive MOF particles were filled in large po...

Pseudomonas putida HS12, which is able to grow on nitrobenzene, was found to carry two plasmids, pNB1 and pNB2. The activity assay experiments of wild-type HS12(pNB1 and pNB2), a spontaneous mutant HS121(pNB2), and a cured derivative HS124(pNB1) demonstrated that the catabolic genes coding for the nitrobenzene-degrading enzymes, designated nbz, are located on two plasmids, pNB1 and pNB2. The ge...

A single crystal of organic nonlinear optical material 3-aminophenol perchlorate (3-AMP) was successfully grown by the slow evaporation solution method. Single-crystal X-ray diffractrometer was utilized to measure unit cell parameters and to confirm lattice parameter. 3-aminophenol perchlorate belongs to monoclinic space group P21. The optical transparency window in the UV–vis-NIR region is fou...

1. A stable, more highly purified, preparation of UDP-glucuronyltransferase was obtained than previously reported. 2. Enzyme activity towards o-aminophenyl and p-nitrophenyl was increased 43- and 46-fold respectively. 3. The final preparation contains only three staining polypeptide bands visible after sodium dodecyl sulphate/polyacrylamide-gel electrophoresis. 4. The only known major accompany...

The capillary electromigration method is an important analytical technique known for its simplicity, sensitivity, and selectivity. We have investigated electrophoretically mediated microanalysis (EMMA) in plug-plug and continuous formats for the determination of phenolic compounds. The azocoupling reactions of phenol, 3-aminophenol, and resorcinol with 4nitrophenyldiazonium fluoroborate were ca...

Two-dimensional x-ray correlation spectra (2DXCS) obtained by varying two delay periods in a time-resolved coherent all-x-ray four-wave-mixing measurement are simulated for the N 1s and O 1s transitions of aminophenol. The necessary valence and core-excited states are calculated using singly and doubly substituted Kohn-Sham determinants within the equivalent-core approximation. Sum-over-states ...