The Board of Directors of the Sociedade Brasileira de Química-SBQ (publisher of the Química Nova-QN) decided that from March 2016 the JBCS will adopt the full open access format in which authors are required to cover part of the publication costs for their articles. See more...
Mauricio M. Victor; Gálber S. B. da Silva
This article describes the selected total syntheses of complex organic compounds, performed in Brazil, which have employed a palladium catalyzed cross-coupling reaction as key step.
Francisco C. F. de França; Ethanielda de L. Coelho; Antônia F. J. Uchôa; Francisco H. A. Rodrigues; Maria E. N. P. Ribeiro; Sandra de A. Soares; Nágila M. P. S. Ricardo
Synthesis of new alkyl phenyl polyglycosides from cardol and the anacardic acid through a green synthetic route.
Amanda L. S. Silva; Elane C. L. dos Santos; Ítalo A. P. dos Santos; Ana M. Q. López
PHA-producing bacteria isolated from the environment was better characterized when submitted to a polyphasic screening, in addition to their biochemical profile in miniaturized galleries such as API 20E® and amplification of genes.
Douglas L. Bernardo; Karina A. Barros; Renato C. Silva; Antonio C. Pavão
Guanine to carcinogen electron transfer mechanism: according to the unsynchronized resonating valence bond theory of L. Pauling, an electron transfer leads to formation of a covalent bond between DNA (guanine) and the carcinogen (PAH).
Cleyson de S. Galúcio; Cibelem I. Benites; Rodney A. F. Rodrigues; Maria Regina Wolf Maciel
Molecular distillation is a clean technology that separates compounds in fractions of seconds. This process allowed for recovery of sesquiterpenes from copaiba oil-resin with 98% purity.
Fernanda C. Bottega; Marcelo R. L. Oliveira; Vanessa Pio Sérvulo; Leila L. Y. Visconte; José D. Ardisson; Mayura M. M. Rubinger
Specimens of nitrile rubber vulcanized with novel tin (IV) accelerators [R = C6H5; ClC6H4; BrC6H4 and IC6H4] for tensile strength and tear resistance analyses.
Marconi B. S. Costa; Ana E. de A. Machado
Second Harmonic Generation (SHG) at the 1653 nm of the P3m1 phase for the BC5 cluster.
Said F. Figueredo; Manuel S. Páez; Jong-Won Song
New global and local reactivity descriptors have been developed in basis to canonical and grand canonical ensembles of conceptual DFT. All of reactivity indices showed a good description of both local and global reactivity trends on the selected molecules.
Nicolas Gouault; Alexandre Cariou; Jean-François Cupif; Patrícia de Aguiar Amaral; Michèle David
Ten substituted pyrazolone derivatives were easily synthesized from perfluorinated allylic alcohols, via a straightforward two steps reaction involving a Heckcoupling/isomerization reaction and subsequent condensation of hydrazines.
F−-sensing properties of a calixpyrrole boradiazaindacene dye were evaluated with respect to the effects of the presence of different tetraalkylammonium cations in CH3CN. The dye exhibited F−-binding affinity in the order KTMA+ > KTEA+ > KTBA+ as a consequence of cation size effects and ion-pairing effects.
Shalimar S. Borges; Leandro P. S. Xavier; Adilson C. da Silva; Sérgio F. de Aquino
Tests were carried out to select the best solid support (granular activated carbon - GAC, crushed ceramic material - CCM, and zeolite - ZEO) and procedure (dip and coat, sol-gel) for TiO2 immobilization for their use in the photocatalysis of sulfamethoxazole (SMX) in aqueous solutions.
Leidy Hoyos Giraldo; Alejandro Ramirez Velez; Monica Mesa Cadavid
Polyaniline-silica composites were synthesized using different mesoporous silica hosts. The synthesis pathway allowed a faster polymerization, high polymerization efficiency and higher molecular weights than for other polyaniline derivatives synthesized without the use of hosts. The high surface area of the silica favored the adsorption of aniline and the presence of aluminium on them accelerated the polymerization process. Therefore, the hosts had dual properties as nucleation centers and catalysts in this process. The composites were electrical conductive materials.
Walter J. Cuadro; Adolfo E. Ensuncho; Juana R. Robles
Prediction of photoelectric conversion efficiency of derivatives D-NPR-A and D-NTP-A.
Gerson F. Silva Neto; Alexandre Fonseca; Jez W. B. Braga
Water classification based on digital images. Waters are combined with colorimetric reagents, the RGB parameters are acquired with a smartphone and discrimination is performed using raw data.
Éderson D'M. Costa; Luciano Cordeiro; Nelson H. T. Lemes; João P. Braga
Transmission and reflection coefficients calculated by the variable amplitude method.
João P. Braga; Nelson H. T. Lemes; Emílio Borges; Rita C. O. Sebastião
What is an inverse problem and how to extract the maximum information from experimental data, such as the potential energy function from second virial coefficient, is the main objective of the present paper.
On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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