JBCS

Pt amount was diminished in 73% by using IrPtSn/C in the electrocatalyst. The current density from ethanol oxidation reaction was improved in about 282%. Mean products of ethanol oxidation was determined through FTIR-ATR experiments. Iridium led the ethanol oxidation reaction to acetaldehyde.

Boosting-PLS uses different training set to improve the PLS results.

Crude oil in subsurface petroleum reservoirs can undergo alteration processes, which results in aerobic and/or anaerobic degradation promoted by microorganisms with sequence removal of saturated hydrocarbons.

A comparative study between the amperometric and spectrophotometric methods for measuring the concentration of the iodide ion to be used as tracer in produced water from offshore oil reservoirs.

Catalytic oxidation of BTX (benzene, toluene and o-xylene) to CO₂ and H₂O promoted by catalysts SiO_2(1-x)Cu_x.

PCA based on full mass spectra was a useful tool for selecting important ions for the GC-MS/SIM quantification of fatty acids, while keeping the some qualitative information. PCA based on mass spectra in the SIM mode (m/z 74, 79, 81 and 87) was useful to determine unsaturations (0, 1, 2, 3 or > 4) and to reveal the presence of contaminants, artifacts and co-eluitions in chromatogram, without additional analysis.

A simple and fast method for determination of macro (Ca, Mg, P) and micro (Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Sr, Zn) elements in energy drinks using inductively plasma optical emission spectrometry was evaluated.

This work presents the synthesis and crystallographic analysis of two stereoisomeric 16,17-secoandrostane mesyloxy derivatives and the study of their antiproliferative activity, influence on cell cycle and induction of apoptosis of tumor cells.

The structure-activity relationship of non-azole antifungal molecules has been investigated by means of descriptor-based (r² = 0.92, q² = 0.90, 6 LVs and r²_pred = 0.86) and hologram-based (r² = 0.87, q² = 0.81, 6 LVs and r²_pred = 0.84) two-dimensional QSAR models. Both approaches underscore the negative contribution of resonance effects towards potency.

Two approaches based on partition equilibrium, stir bar sorptive extraction and microextraction by packed sorbent, were evaluated for the determination of selective serotonin reuptake inhibitor antidepressants by non-aqueous capillary electrophoresis with spectrophotometric detection.

It was shown that Sn (derived from tributyltin (TBT) exposure) is bioaccumulated by the blue crab in higher concentrations in the hepatopancreas. The results suggest that Sn is bioaccumulated as TBT.

Nano Fe₂O₃, clinoptilolite and H₃PW₁₂O₄₀ efficiently catalyze reaction of hydroxylamine hydrochloride, sodium acetate, acetoacetic ester or benzoyl acetic ester and appropriate aldehydes to afford corresponding 5(4H)-isoxazolone. The present protocols offer several advantages, such as short reaction times, reasonable yields and recycling catalysts with a very easy workup.

A new prenylated flavone (1) together with 24 known compounds were isolated from the roots of a hybrid between Artocarpus heterophyllus and Artocarpus integer.

Na_0.3V₂O₅ nanofibers/nanorings were prepared through a simple one step hydrothermal method without any surfactant at 200 ºC for 3-5 days. They exhibited an initial discharge capacity of 182 mAh g^-1 and a stabilized capacity of 179 mAh g^-1 even after 50 cycles. A possible mechanism of ring formation is discussed.

A rapid, sensitive and versatile method for the individual and simultaneous determination of the anticancer drugs emodin and irinotecan in biological fluids based on the square wave voltammetry using renewable pencil graphite electrodes was investigated.

The electroreduction of isoflurane in presence of tetraphenyl iron (III) porphyrin chloride (Fe(TPP)Cl) showed that the reduction of isoflurane was performed with overpotential of about 1150 mV lower than the observed potential for reduction of isoflurane in DMSO solution.

The antileishmanial activity of a series of enonic derivatives (chalcones) synthesized via Claisen-Schmidt condensation reactions assisted by ultrasonic radiation was characterized by analyzing their cytotoxicity against Leishmania (Viannia) panamensis promastigotes.

Green and automatic potentiometric determination of the acid number of vegetable oils and animal fats; this parameter is of fundamental importance for their specification.

Isolation of the new triterpene 3,16,21-trioxo-6β,12α-dihydroxy-1-en-friedelane (named maytensifolone), along with 3-oxofriedelane, 3,12-dioxofriedelane, 3β-hydroxyfriedelane, 3-oxo-29-hydroxyfriedelane, 3-oxo-12α-hydroxyfriedelane and 3-oxo-30-hydroxyfriedelane from the leaves of Maytenus distichophylla.

Langmuir adsorption isotherm model was evaluated to calculate the adsorption capacity of the Amberlite XAD-4 resin for Au(III) ions.