JBCS



5:49, dom jul 22








Autores: A partir do fascículo 39/9 a revista Química Nova adotou a licença CC-BY. Mais informações a respeito dessa licença podem ser obtidas aqui.

Artigos no Prelo


Artigos

ANALYSIS OF THE PERFORMANCE OF A PACKED BED REACTOR TO PRODUCTION ETHYL ESTERS FROM CRUDE VEGETABLE OIL USING LIPASE IMMOBILIZED IN SILICA MODIFIED WITH PROTIC IONIC LIQUID

Juliana Lisboa Santana; Juliana Marçal de Oliveira; Nayara Bezerra Carvalho; Natália Maria Ferreira de Melo Osório; Silvana Mattedi; Lisiane dos Santos Freitas; Eliane Bezerra Cavalcanti; Álvaro Silva Lima; Cleide Mara Faria Soares

The silica prepared in the absence and presence of the protic ionic liquid was used in a packed bed reactor for the characterization of the reactor by the residence time distribution and the mass transfer effect.

http://dx.doi.org/10.21577/0100-4042.20170261

Publicado online: julho 19, 2018
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COMPARAÇÃO DOS NÍVEIS DE POLUENTES EMITIDOS PELOS DIFERENTES COMBUSTÍVEIS UTILIZADOS PARA COCÇÃO E SUA INFLUÊNCIA NO AQUECIMENTO GLOBAL

Adriana Gioda

One of the main causes of global warming is the use of fossil and biomass fuels. Products and by-products generated by burning result in increased greenhouse gases. These fuels are also used for cooking, so it also has its share of contribution to global warming.

http://dx.doi.org/10.21577/0100-4042.20170260

Publicado online: julho 19, 2018
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OPTIMIZATION OF SOLVENT-FREE GERANYL BUTANOATE PRODUCTION USING NOVOZYME 435 AND HOMEMADE POLYURETHANE IMMOBILIZED NOVOZYME NZL-102-LYO-HQ AS CATALYSTS

Carla R. Sbardelotto; Suelen P. Piazza; Nadia L. D. Nyari; Rogério M. Dallago; Débora de Oliveira; Vladimir de Oliveira; Jamile Zeni; Rogério L. Cansian; Natalia Paroul

A homemade and commercial immobilized lipases were used to geranyl butanoate production by esterification of geraniol and butanoic acid with production optimization and kinetic evaluation.

http://dx.doi.org/10.21577/0100-4042.20170259

Publicado online: julho 19, 2018
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MOLECULAR DESCRIPTION OF COPPER (I) OXIDE AND COPPER (II) OXIDE

Wei Gao; Muhammad Imran; Muhammad Kamran Siddiqui; Muhammad Naeem; Farrukh Jamil

The topological index of a molecular structure correlate certain physicochemical properties such as boiling point, enthalpy and entropy and stability of that molecular structures. In this article we have computed topological indices for Copper (I) oxide and Copper (II) oxide.

http://dx.doi.org/10.21577/0100-4042.20170257

Publicado online: julho 12, 2018
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ALKALOIDS FROM LEAVES OF Guatteria pogonopus (ANNONACEAE) AND THEIR CYTOTOXICITIES

Maria de Fátima C. Santos; José Eraldo N. Fontes; Lívia M. Dutra; Larissa M. Bomfim; Cinara O. D. Costa; Valéria R. S. Moraes; Andersson Barison; Milena B. P. Soares; Felipe Moura A. da Silva; Jackson R. G. da Silva Almeida; Héctor H. F. Koolen; Daniel P. Bezerra; Emmanoel Vilaça Costa

Aporphine, oxoaporphine and tetrahydroprotoberberine alkaloids were isolated from the leaves of Guatteria pogonopus. The NMR data for most of the described alkaloids were reviewed herein. In addition, the cytotoxicity of these alkaloids was evaluated.

http://dx.doi.org/10.21577/0100-4042.20170258

Publicado online: julho 12, 2018
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TRACE ELEMENTS IN RIVER WATERS AND SEDIMENTS BEFORE AND AFTER A MINING DAM BREACH (BENTO RODRIGUES, BRAZIL)

Danilo de C. Silva; Carlos R. Bellato; José de O. Marques Neto; Maurício P. F. Fontes

Trace elements in the sediments of Carmo River before and after the deposition of the tailings mud. Sequential extraction was used to investigate the distribution of As and metals. High concentration of trace elements associated with easily mobilized fractions.

http://dx.doi.org/10.21577/0100-4042.20170252

Publicado online: junho 26, 2018
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EFEITO DA CONCENTRAÇÃO DOS ÍONS Eu3+ E Bi3+ NAS PROPRIEDADES FOTOLUMINESCENTE DA MATRIZ DE YVO4

Marcela G. Matos; Emerson H. de Faria; Katia J. Ciuffi; Lucas A. Rocha; Eduardo J. Nassar; Marc Verelst

This work showed the influence of the dopants concentration on the spectroscopic properties of the europium III ion and the crystallite size, when incorporated in the yttrium vanadate matrix obtained by non-hydrolytic sol-gel route.

http://dx.doi.org/10.21577/0100-4042.20170251

Publicado online: junho 26, 2018
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Revisão

A FAMÍLIA DAS BAMBUS[N]URILAS

Renato Salviato Cicolani; Grégoire Jean-François Demets

Bambus[n]uril cavitands have a low electron density (blue) at the center of the cycle and binds anions with high affinity and selectivity.

http://dx.doi.org/10.21577/0100-4042.20170250

Publicado online: junho 19, 2018
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Nota Técnica

APLICAÇÃO DE PROGRAMA COMPUTACIONAL LIVRE EM PLANEJAMENTO DE EXPERIMENTOS: UM TUTORIAL

Fabíola Manhas Verbi Pereira; Edenir Rodrigues Pereira-Filho

Factorial design: use of free software and videos for better data interpretation.

http://dx.doi.org/10.21577/0100-4042.20170254

Publicado online: junho 28, 2018
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POTENCIAL EXPOSIÇÃO AO MERCÚRIO ATMOSFÉRICO NO AMBIENTE OCUPACIONAL DE COMÉRCIOS DE OURO DE PORTO VELHO, RONDÔNIA

Leidiane C. Lauthartte; Diego F. Gomes; Marília H. Mussy; Ígor B. B. de Holanda; Ronaldo Almeida; Wanderley R. Bastos

Alluvial gold mining dredge on the Madeira river. The gold extracted by the dredges is taken to the city of Porto Velho for commercialization, where the its smelting and Hg exposure occurs in the atmosphere of specialized stores.

http://dx.doi.org/10.21577/0100-4042.20170253

Publicado online: junho 28, 2018
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SYNTHESIS OF GOLD NANOPARTICLES BY TETRACHLOROAURATE REDUCTION WITH CYCLODEXTRINS

Yuri S. Pestovsky; Agustino Martínez-Antonio

The immobilization of cyclodextrin onto the surface of gold nanoparticles at the time of their formation. Cyclodextrin acts as a reductant and a stabilizer.

http://dx.doi.org/10.21577/0100-4042.20170244

Publicado online: maio 30, 2018
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DOSIMETRIA DE LUZ EFETIVAMENTE ABSORVIDA (Dabs) PELO AZUL DE METILENO EM PROCESSOS DE FOTOSSENSIBILIZAÇÃO UTILIZANDO FONTES DE LUZ POLICROMÁTICAS

Bruno R. Rabello; Wilker Caetano

Light dosimetry effectively absorbed (Dabs) by methylene blue in photosensitization processes employing polychromatic light sources.

http://dx.doi.org/10.21577/0100-4042.20170243

Publicado online: maio 30, 2018
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Educação

IDENTIFICAÇÃO DE ADULTERAÇÃO EM ÓLEOS DE OLIVA: PROBLEMATIZANDO A INTRODUÇÃO À ESPECTROMETRIA DE MASSAS

Angélica Priscila Parussolo Tonin; Gabrielly Ribeiro Carneiro; Marcos Alessandro dos Santos Ribeiro; Jaime da Costa Cedran; Valquíria de Moraes Silva; Eduardo Cesar Meurer

Students using mass spectrometry to check if the oils were adulterated with soybean oil. An investigative approach to learning mass spectrometry and other fundamental concepts of chemistry.

http://dx.doi.org/10.21577/0100-4042.20170256

Publicado online: junho 28, 2018
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O ESPAÇO DA QUÍMICA NOS CENTROS E MUSEUS DE CIÊNCIAS BRASILEIROS

Ana C. da S. Steola; Ana C. Kasseboehmer

In this article we discuss the space of Chemistry in Brazilian science centers and museums through a documental survey conducted by telephone, mail and analyzing the websites of those places.

http://dx.doi.org/10.21577/0100-4042.20170248

Publicado online: junho 7, 2018
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AN APPROACH TO THE KINETICS AND THERMODYNAMICS OF ELEMENTARY CHEMICAL REACTIONS USING A STOCHASTIC MODEL

Francis Pereira Nascimento; Baraquízio Braga do Nascimento Junior; Luiz Augusto Martins Cardoso; Rodrigo Veiga Tenório de Albuquerque; Nemesio Matos Oliveira-Neto

Top Figure: Potential energy for A ⇆ B reaction. Bottom Left Figure: Transitions between states A and B. (i) Ehrenfest urn model (Urns A and B) randomly defines the collision between molecules; (ii) Monte Carlo method (PAB and PPBA: Metropolis Update) defines the transition probabilities. Bottom Right Figure: A tipical results for 102 samples.

http://dx.doi.org/10.21577/0100-4042.20170241

Publicado online: maio 22, 2018
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DE ONDE VÊM OS NOMES DAS VIDRARIAS DE LABORATÓRIO?

Iara Terra de Oliveira; Karim Maria Chagas Zuccheratto; Isabela Zampirollo Granado; Paula Homem-de-Mello; Hueder Paulo Moisés de Oliveira

Presentation of the origin of the names and the historical background of development of glassware used in Chemistry experimental classes can make learning more meaningful.

http://dx.doi.org/10.21577/0100-4042.20170240

Publicado online: maio 22, 2018
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O CRITÉRIO DE EULER COMO FERRAMENTA PARA O ESTUDO E DIFERENCIAÇÃO ENTRE FUNÇÕES DE ESTADO E VARIÁVEIS DE PROCESSO EM TERMODINÂMICA QUÍMICA

Paulo F. R. Ortega; Natal J. Pires; Cláudio P. Lima

The Euler's relation, as a mathematical consequence of the exact differential equations, allows an easy and didactic differentiation of the thermodynamic variables in state functions and process variables.

http://dx.doi.org/10.21577/0100-4042.20170234

Publicado online: maio 9, 2018
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CARACTERIZAÇÃO DE OBSTÁCULOS EPISTEMOLÓGICOS NA CONCEPÇÃO DE LICENCIANDOS EM QUÍMICA QUE DIFICULTAM O DESENVOLVIMENTO DO CONHECIMENTO PROFISSIONAL DOCENTE

Graziele B. O. Pena; Nyuara A. S. Mesquita

This article discusses the epistemological obstacles related to the Pedagogical Knowledge of Chemistry Content that influence the formative process of future professors of chemistry.

http://dx.doi.org/10.21577/0100-4042.20170233

Publicado online: maio 9, 2018
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