A novel fluorescent and colorimetric dual mode molecular probe based on fluorene derivatives, N-(9H-fluoren-2-yl)-5H-cyclopenta [2,1-b:3,4-b']dipyridin-5-imine (FCD), was synthesized and characterized by elemental analysis, FT-IR, 1HNMR, and 13CNMR techniques. The optical properties of the ...

An optical cascade sensor of iodide and fluoride ions based on simple tryptophan derivative containing urea functional group has been designed and synthesized via one-step reaction and characterized by different spectroscopic techniques. The tetrahydrofuran solution of the sensor becomes yellow ...

Following our recent study devoted to measurements of intensities of rovibrational lines in the ν6 band of methyl iodide (12CH3I) centered at 892.918 cm−1, room temperature infrared spectra of methyl iodide diluted in nitrogen at fourteen total pressures between 20 and 300 hPa have been recorde...

The structural, fluorescence properties and binding interaction of benzazaborole derivatives 1-hydroxy-2-(α-methyl) benzyl-1,2-benzo boron nitrogen heterocyclic-3-phosphate diethyl ester (PADE) and 1-hydroxy-2-(2-chloro) benzyl-1,2-benzo boron nitrogen heterocyclic-3-phosphate diethyl ester (PA...

In this work, we have successfully designed an “off-on” fluorescent sensor based on nitrogen-doped graphene quantum dots (N-GQDs) system to detect iodide ions in milk powder. The fluorescence intensity of N-GQDs was significantly quenched by Ag+ through forming N-GQDs/Ag+ complexes due to the ...

The redox reactions between pollutants and chemicals (e.g., pollutant, oxygen, and water) critically affect the fate and potential risk of pollutants, and their rates significantly depend on the environmental media. Although the kinetics and mechanism of various redox reactions in water have bee...

In this work, the authors have presented a study on the variation in optical parameters that occur on doping Poly-methyl-metha crylate (PMMA) thin films with Potassium chromate (K2CrO4) by different weight percentages (1%,2%, 5% and 10%). These pure PMMA and its composite films are of thickness ...

Chromate can be considered a potent environmental contaminant and consequently, an understanding of chromate availability and toxicity to soil biology is essential for effective ecological assessment of metal impact in soils. This study shows the response of two bacterial bioreporters, pCHRGFP1 ...

Layered zinc hydroxide nitrate (ZnHN) and Zn/Ni layered double hydroxide salts were synthesized and used to remove chromate ions from solutions at pH 8.0. The materials were characterized by many instrumental techniques before and after chromate ion removal. ZnHN decomposed after contact with th...

The redox reaction between 4-chlorophenol (4-CP) and chromate (Cr(VI)) (i.e., the simultaneous oxidation of 4-CP by Cr(VI) and reduction of Cr(VI) by 4-CP) in ice (i.e., at −20 °C) was compared with the corresponding reaction in water (i.e., at 25 °C). The redox conversion of 4-CP/Cr(VI), whic...

The basic mercury(I) chromate(VI), Hg6Cr2O9 (=2Hg2CrO4·Hg2O), has been obtained under hydrothermal conditions (200 °C, 5 days) in the form of orange needles as a by-product from reacting elemental mercury and K2Cr2O7. Hydrothermal treatment of microcrystalline Hg6Cr2O9 in demineralised water a...

The central protein of the sulfur-oxidizing enzyme system of Paracoccus pantotrophus, SoxYZ, formed complexes with subunits associated and covalently bound. In denaturing SDS–polyacrylamide gel electrophoresis (PAGE) SoxY migrated at 12 and SoxZ at 16 kDa. SDS–PAGE of homogeneous SoxYZ without...

Glutathione peroxidase (GPX), superoxide dismutase (SOD) and catalase (CAT) play crucial roles in the metabolism and homeostasis of reactive oxygen species (ROS) in living organisms. From examination of the steady state and pre-steady state kinetic behavior of natural GPX it was found that, in c...

The photographic process of ‘infectious development’ in which 1-acyl-2-arylhydrazines reduce Ag(I) has been studied using analogues. 1-Acyl-2-aryldiazenes, resulting from oxidation of 1-acyl-2-arylhydrazines, are hydrolysed to anions of aryldiazenes (ArN=NH), which undergo further oxidation wi...

A new series of phenanthridinone derivatives, and diketo acid analogs, as well as related phenanthrene and anthracene diketo acids have been synthesized and evaluated as HIV integrase (IN) inhibitors. Several new β-diketo acid analogs with the phenanthridinone scaffold replaced by phenanthrene,...

In this phase of structure–affinity relationship study of VL-0395, a new anthranilic acid based CCK1 selective antagonist, we propose a series of unnatural aminoacidic derivatives. The result of this work is the identification of a new CCK ligand, which possesses an affinity (IC50 = 35 nm) one ...

The reaction of benzoyl isothiocyanate with l-serine, l-proline, d-methionine and l-alanine gave 2-[(benzoylcarbamothioyl)amino]-3-hydroxypropanoic acid (I), 1-(benzoylcarbamothioyl)pyrrolidine-2-carboxylic acid (II), 2-[(benzoylcarbamothioyl)amino]-4-(methylsulfanyl)butanoic acid (III) and 2-[(...

The molecular structures of the title compounds were determined by X-ray crystallography, using direct methods, and refined to final conventional residual parameters of R = 0.042, 0.035, 0.060, 0.062, and 0.047, respectively. meso-d-glycero-l-altro-Heptitol crystallised usually as a monohydrate ...

l-Idaro-1,4-lactone was synthesized by two different, published methods: (1) epimerization of monopotassium d-glucarate by refluxing in aqueous barium hydroxide, and (2) oxidation of l-iditol by heating in dilute nitric acid. The lactone, formed by heat dehydration from aqueous solution at low p...

Butyrivibrio fibrisolvens strain X6C61 produces two extracellular polysaccharides (EPS-I and EPS- II) separable by anion-exchange chromatography. The neutral sugar constituents of EPS-I were identified by gas-liquid chromatography (GLC) as the alditol acetates of rhamnose, mannose, galactose, gl...