The photochemistry of quinoline and isoquinoline N-oxides has been reexamined. 3, 1-Benzoxazepine, which had not been isolated as yet, was obtained from the former, while the formation of 1, 3-Benzoxazepine from the latter was demonstrated.

The determination of traces of fluoride by means of the molecular absorption of AlF volatilized in graphite cuvettes is described. An extraction method for separation and preconcentration of the fluoride has been developed, to avoid matrix effects. The fluoride is extracted with 10−3M triphenyla...

For the industry applications of zeolites, the pore sizes are limited between 8, 10 and 12-rings. Although there are many extra-large pore zeolites, the studies of their applications are very limited due to their low stabilities or limited catalytic sites. Here, we successfully synthesized the e...

An efficient and short synthetic procedures affording the biologically active natural products primin, miconidin, olivetol, grevillol, and cardol (adipostatin A) in high yields are reported. The two strategies involve Sonogashira and Suzuki cross-couplings as the crucial steps for the installati...

Betanin and isobetanin from purple pitaya fruits originating from Israel, commercial red beet samples from Germany and France, as well as from a commercial pigment extract, respectively, were isolated by column chromatography and semi-preparative HPLC. Their δ13CV-PDB and δ2HV-SMOW values were...

Betanin is a natural pigment with significant antioxidant and biological activities currently used as food colorant. The isolation of betanin is problematic due to its instability. In this work, we developed a fast and economic procedure based on molecularly imprinted solid-phase extraction (MIS...

Fungi are well known to strongly interact with metals, thereby influencing metal biogeochemistry in the terrestrial environment. To assess and quantify potential fungi-vanadium (V) interactions, Amanita muscaria, Armillaria cepistipes, Xerocomus badius and Bjerkandera adusta were cultured in med...

Phosphinic and phosphonic acids were treated with pentamethylantimony to replace one of its methyl groups (with formation of methane) to give the following new compounds: (CH3SbOP(O)(C6H5)2, (CH3)4SbOP(O)(OH)CH3, and (CH3)4SbOP(O)(OH)C6H5). The latter two compounds are associated, presumably thr...

ObjectiveArsenic is a well-known environmental contaminant, causing toxicity in different organs. The aim of this study was to investigate the possible neuroprotective effect of ellagic acid (EA) on arsenic-induced neurotoxicity in rats.

A series of the arsenate-substituted natroalunite solid solutions were synthesized by hydrothermal precipitation at 200 °C and pH of 4 and characterized to investigate the AsO4 substitution for SO4 in natroalunite as the base of a possible immobilization method for arsenic. The AsO4 substitutio...

Biologically toxic arsenate is physicochemically similar to biologically essential phosphate. Because arsenate and phosphate are indiscriminately incorporated by microbes, their ambient concentration ratios can be an important factor controlling microbial growth and metabolism. This study invest...

In most mammalian species, arsenic biotransformation occurs primarily by biomethylation and reduction reactions, with dimethylarsinic acid being the predominant metabolite excreted in the urine. Methylenetetrahydrofolate reductase (Mthfr) plays a key role in folate metabolism by channeling one-c...

In toxicokinetics studies, interactions between chemicals in mixtures has been largely neglected. This study examines a mixture of perchlorate and arsenate because (1) they have the potential to co-occur in contaminated aquatic habitats, and (2) a previous study by the authors found possible tox...

Arsenic is a neurotoxic substance that makes the brain susceptible to free radicals. Thymoquinone (TQ) is a potent antioxidant extracted from Nigella sativa seeds. It scavenges free radicals and prevents the cell damage resulted from oxidative substances. In this study, the ameliorative effect o...

The treatment of microglial BV-2 cells with sodium arsenate (As(V): 0.1–400 μmol/L — 48 hr) induces a dose-dependent response. The neurotoxic effects of high concentrations of As(V) (100, 200 and 400 μmol/L) are characterized by increased levels of mitochondrial complexes I, II, and IV follo...

Prenatal exposure to arsenic, a naturally occurring toxic element, causes neural tube defects (NTDs) and, in animal models, orofacial anomalies. Since aberrant development or migration of cranial neural crest cells (CNCCs) can also cause similar anomalies within developing embryos, we examined t...

Arsenic residue is of great concern due to its environmental hazard. In this study, we first propose to use cullet as the host to immobilize sodium arsenate. All samples have successfully formed glasses in 1200 °C detected by X-ray diffraction spectra (XRD). High arsenic immobilization ratio ha...

In this work, we reported on the synthesis and characterization of (Z)-4-oxo-4-ureido-but-2-enoic acid and p-toluenesulfonic acid 3-nitrophenyl ester and their detailed crystal structure information were studied. The crystallization of (Z)-4-oxo-4-ureido-but-2-enoic acid results in reduced π-co...

Yttrium 3-(4-nitrophenyl)-2-propenoate has been studied as an effective corrosion inhibitor for copper alloy in 0.1 M chloride solution. The results show that the surface of copper alloy coupons exposed to solutions containing 0.45 mM yttrium 3-(4-nitrophenyl)-2-propenoate had no signs of corros...

New coumarin fused oxazoles were investigated as photosensitive units for carboxylic acid groups using butyric acid as a model compound. 6-Oxo-6H-benzopyrano[6,7-d]oxazol-8-yl)methyl derivatives possessing various (hetero)aromatic substituents at position 2 of the heterocyclic system were used i...