JBCS

p-Methoxyphenyltellurium trichloride reacts with alkynes in a short reaction time under microwave irradiation in the absence of solvents.

This review presents the recent syntheses of epibatidine since 2002, summarized by the method used to obtain the azabicyclic core.

Topological methods and response functions were used to investigate in detail the electronic (charge) properties of 1,1-diamino-2,2-dinitroethylene (FOX-7) including acid-base properties and onset of fragmentation.

The earthworms act as microbioreactors leading to various several unit operations that conduce the stabilization of the recent organic matter, transforming it in a more refratory material.

Aldrin mass fraction was determined by mass balance, after determination of impurity mass fractions by gas chromatography with flame ionization detection, gas chromatography-mass spectrometry, gas chromatography with electron capture detector (organics), Karl Fischer coulometric titration (water content), and inductively coupled plasma mass spectrometry (inorganics). The results were validated through the participation of the National Institute of Metrology, Quality and Technology in the key-comparison CCQM-K55.b organized by Organic Analysis Working Group/International Bureau of Weights and Measures.

Homogeneous liquid-liquid microextraction via flotation assistance was investigated for the extraction of molybdenum from water samples. The developed method was sensitive, reproducible and linear over a wide range.

A methodology for the determination of nelfinavir and its impurities was proposed using micellar electrokinetic chromatography (MEKC)-UV. The electrolyte was optimized using mixed-level factorial design. The robustness (using Youden's test) showed that the buffer concentration had the greatest effect in the separation factor.

The activation energies (E_a) of the thermal degradation processes in C-rich and poor SiOC glasses, determinated by Ozawa method, allowed to identify two degradation steps for all samples with different complexities.

Effective Heck arylations of non-activated N-acyl-3-pyrrolines with arenediazonium salts were accomplished applying microwave irradiation.

In the present work, novel procedure for synthesis of pyrido[2,3-d][1,2,4]triazolo[4,3-a] pyrimidin-5-ones has been reported by using cellulose sulfuric acid as biopolymeric solid support acid catalyst.

Dye-contaminated effluent treated with carbon composite adsorbent. Left untreated effluent, right treated effluent.

Raw leachate is a complicated sample with high chemical oxygen demand (COD) and color. Hence, a cheap, effective, and easy electrochemical oxidation technique is used in this study to reduce the concentration of pollutants in terms of COD and color.

The ¹⁰B/¹¹B ratio in the enamel of the healthy teeth and carious teeth fluctuated over a broad range, ranged from 0.2007 to 0.2574. And it has significant variation with respect to age and gender.

A cloud-point extraction method using the surfactant (30)p-tert-octylphenol polyoxyethylene was proposed as the preceding step for the determination of polycyclic aromatic hydrocarbons by gas chromatography-mass spectrometry.

The macrocyclic ligand, 12-crown-4, was used as an ionophore for fabrication of a polyvinyl chloride based membrane sensor for aluminum(III) cation. It was successfully used for the determination of this metal cation in some rocks and aluminum-magnesium syrup.

Intercalated 4-aminobenzenethiol between gold and silver nanoparticles was prepared and its surface-enhanced Raman scattering (SERS) signal is dependent on sandwiched nanostructure.

Expansion, exfoliation and oxidation of graphite using a microwave-assisted acid method to prepare few layers graphene oxide (GO) and reduced graphene oxide (rGO) film with relatively high electrical conductivity.

A procedure was developed for the direct determination of Sb^III and total inorganic Sb in water samples by hydride generation atomic absorption spectrometry (HG AAS), without pre-reduction of Sb^V.

These polymers present germanium and sulfur in their structure. They are transparent in the visible range and show flexibility. Other characteristic is the glass transition temperature found in temperatures below 0 °C, which may suggest applications in low temperatures.

One step deposition of thin films containing silver nanoparticles on glass surfaces was made using charged silsesquioxane as nanoparticle stabilizer and as crosslinking agent. The system showed antimicrobial activity and it is promising as coating for glass used as food package and for hospital instruments that require sterilization.

The present study describes the synthesis of naphthoquinoidal derivatives, phenazines and aryl triazoles as well as the evaluation of these compounds against Mycobacterium tuberculosis. This report represents an important contribution to the discovery of new anti-tuberculosis derivatives.

This article is part of the Special Issue Rare and Neglected Diseases - Vol. 25, No. 10 (2014).

Theoretical study of the molecular fragment present in the experimental structure of the [5₁ knot×××(PF₆)₉]Cl system using ONIOM(M06/6-31G(2d,p):PM6) method.

A simple and very sensitive electrochemical sensor based on iridium oxide nanoparticles (IrOxNPs) has been developed by modification of glassy carbon electrode (GCE) and utilized to determine isoprenaline (IP). This sensor was used successfully for IP determination in human urine samples. The detection limit of the modified electrode toward IP was 90 nmol L^-1.

The diterpene ent-18,19-dihydroxytrachylobane was biotransformed by Rhizopus stolonifer, and yielded three new compounds: ent-11β,18,19-trihydroxytrachylobane, ent-16α,18,19-trihydroxykaur-11-ene and ent-18,19-dihydroxy-16α-methoxykaur-11-ene.

Chemical structures of the main borodiazaindacenes (BODIPYs) and the fluorescence turn-off observed under black light for the pyridyl-substituted BODIPY with growing concentration of Fe(III).