Desde seu início, tanto Química Nova quanto o Journal of the Brazilian Chemical Society, as publicações mais antigas da SBQ, vem oferecendo acesso gratuito aos seus leitores seja através do seus websites, seja pelo Portal SCIELO. Esta foi uma decisão importante que muito contribuiu para a divulgação e consolidação de nossas revistas, além de apoiar um modelo de publicação que prescinde da venda de assinaturas. Veja mais...
Anna De Falco; Daphne Schneider Cukierman; Rachel A. Hauser-Davis; Nicolás A. Rey
Alzheimer's Disease is the prevalent cause of dementia worldwide. Unfortunately, as of yet, there is still no cure. The different molecular hypotheses behind this condition and their relation to available treatments and potential new drugs are discussed herein in detail.
María Juliana Maccarrone; Cecilia Lederhos; Carolina Betti; Nicolás Carrara; Juan C. Yori; Fernando Coloma Pascual; Domingo Liprandi; Carlos Vera; Mónica Quiroga
The catalyst 7.1WN/A was the most active and selective (94%) for the (Z)-alkene at 323 K. The selectivity of the catalyst compared favorably to that of the classical and more expensive Lindlar catalyst.
Lucas L. Franco; Wagner G. Canhestro; Vítor L. S. Cunha; José D. S. Filho; Ricardo J. Alves; Ricardo J. Alves
Silver carbonate efficiently promoted the glycosylation of cyclohexanol with peracetylated N-phtaloyl-α-D-glucosaminyl halides as compared to other promoters: silver trifatle and Mercury (II) bromide/mercury (II) oxide. The reaction did not work with three other glycosyl donors.
Ana Cristina Lüdtke; Deborah Pinheiro Dick; Celso Aita; Bruno Pavan; Luiza Morosino; Alexandre Doneda; Rafael Ricardo Cantú
The addition of composted pig slurry, even in small amounts, to a sandy Acrisol affects the soil organic matter. As a consequence, the distribution of the humic fractions is altered, with an enhancement of humic acid micelles.
Muhammad Ashfaq; Muhammad Mahboob Ahmed; Salama Shaheen; Rukhsana Tabussam; Gildardo Rivera
We report excellent antibacterial activity of organotin(IV) esters. The tendency for inhibition was found to be stronger against E. coli than other bacterial strains. Insecticidal toxicity was also determined.
Silas R. Ferreira; Fabio R. Barreira; Luciana S. Spinelli; Katia Z. Leal; Peter Seidl; Elizabete F. Lucas
Optical micrographs of petroleum before (a) and after (b) asphaltene precipitation as a function of volume of n-heptane added.
Ana P. Oliveira; Amanda L. Guimarães; Alessandra G. M. Pacheco; Camila S. Araújo; Raimundo G. Oliveira Júnior; Érica M. Lavor; Mariana G. Silva; Edigênia C. C. Araújo; Rosemairy L. Mendes; Larissa A. Rolim; Marcília P. Costa; Henrique C. L. Farias; Cláudia do Ó Pessoa; Norberto P. Lopes; Lucas M. M. Marques; Jackson R. G. S. Almeida
This work isolates the compound 3',4',5-trihydroxy-6,7-dimethoxyflavone (cirsiliol) from the leaves of the cultivated Leonotis nepetifolia, and evaluates in vitro the crude ethanol extracts and phases with respect to their potential antimicrobial, cytotoxic, and antitumoral activity.
Paulo H. S. Ribeiro; Maria L. dos Santos; Claudio A. G. da Camara; Flávia S. Born; Christopher W. Fagg
Eugenia species, widely dispersed in the cerrado, were investigated and study results indicate that their leaf essential oils feature notable amounts of α- and β-pinene, limonene, bicyclogermacrene, β-caryophyllene, spathulenol, and globulol, which exhibit acaricidal activity against T. urticae.
Flavio Dolores Martínez-Mancera; José Luis Hernández-López
Schematic illustration of co-poly(L-lysine)-graft-(ε-N-[X-D-biotinyl]-L-lysine).
Cíntia de A. Custódio; Simon J. Garden
The title compounds were prepared by nucleophilic aromatic substitution of 2,4-dinitrochlorobenzene followed by regioselective reduction using stannous chloride suspended in EtOAc. The reduction products were characterized as the acetamide derivatives.
Emerson F. Marques; Paulo C. Vieira; Richele P. Severino
Acridone alkaloids inhibit the enzyme cathepsin L as reversible competitive inhibitors with respect to the substrate Z-FR-MCA.
Leandro W. Hantao; Bruna R. Toledo; Fabio Augusto
The application of ionic liquids (IL) as sorbent materials has proven highly successful in chemistry mainly due to their unique chemical and physical properties. As stationary phases in gas chromatography (GC), IL exhibit a multitude of requisites to provide highly efficient separations, namely, high thermal stability, negligible vapor pressure, and unique solvation properties.
Paulo H. M. Marfil; Felipe H. T. Vasconcelos; Márcia H. Pontieri; Vânia R. N. Telis
A spectrophotometric method was developed and validated for determining the microencapsulation efficiency of palm oil by complex coacervation.
Marcos A. A. Silva; Adhane T. D. Borges; Nelson R. Antoniosi Filho
An assay was developed for use in petrol stations to determine the presence of biodiesel in diesel-biodiesel blends based on the visual observation of significant coloring of the products.
Carmen Silvia da S. Sá; Wildson Luiz P. Santos
The identities of the basic education teacher, higher education professor and bachelor's degree in chemistry/researcher circulate during a person's undergraduate degree, and the motivation to take on one of the identities depends on intrinsic and extrinsic factors affecting students and professors.
Guilherme Antonio Finazzi; Carlos Ney Martins; Milton Duffles Capelato; Luiz Henrique Ferreira
Low-cost teaching experiments that obeyed the principles of Green Chemistry were developed. Copper electrogravimetry experiments were used because visual changes may be easily observed, thus facilitating the didactic exploration of gravimetric and electrochemical concepts.
Antonio G. Sampaio de Oliveira Filho; Ana Paula de Lima Batista
The electronic spectrum of the I2 molecule is calculated using scientific computing tools.
On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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