[PDF] Top 20 J. Braz. Chem. Soc. vol.20 número4
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J. Braz. Chem. Soc. vol.20 número4
... Throughout its entire history, SBQ has been directed toward the production of science and the formation of high quality professionals. Science and Education are permanent focuses of SBQ’s performance and of its editorial ... See full document
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J. Braz. Chem. Soc. vol.20 número4
... In titration calorimetry usually small portions of a concentrated solution of surfactant R 2 (or pure R 2 ) are added successively to a solution of reactant R 1 or pure solven[r] ... See full document
17
J. Braz. Chem. Soc. vol.20 número4
... separated by chromatography on Sephadex LH-20 and C 18 reversed-phase columns. Further HPLC separations using C 18 -phenyl or cyanopropyl silica columns did not provide rodriguesines A (1) and B (2) as pure ... See full document
14
J. Braz. Chem. Soc. vol.20 número4
... due to the four naphthoquinone aromatic hydrogens H5- H8 that appear in the d 7-8 ppm region as dd or ddd (H5 and H8) and td (H6 and H7) (see Figure 1 for numbering and experimental for data). The other chemical shifts ... See full document
30
J. Braz. Chem. Soc. vol.20 número4
... copper(II)-tetrasulfonated phtalocyanine, exhibiting metallic conductivity near the Ru(III/II) redox potential, as well as enhanced electrocatalytic activity for oxidation of nitrit[r] ... See full document
9
J. Braz. Chem. Soc. vol.20 número4
... An innovative series of silica-based hybrid materials containing pendant cationic ammoniumpropyl groups was obtained using the sol-gel method, by varying the molar ratio of the[r] ... See full document
7
J. Braz. Chem. Soc. vol.20 número4
... Keywords: methylpyridinium, silsesquioxane modified polymer, adsorption, stability constants at heterogeneous surface, solid-solution interface.. Introduction.[r] ... See full document
9
J. Braz. Chem. Soc. vol.20 número4
... The main ions fragments observed in the ESI-MS/MS spectrum (low resolution) of 1 and 2 are summarized in Scheme 1. These fragmentation pattern are compatible with that of plumeran alkaloids, as 21-oxo-aspidoalbidine ... See full document
13
J. Braz. Chem. Soc. vol.20 número4
... In the light of these facts, it is possible to understand the scatterplots for the data sets studied (Figures F20 - F24 and Table 33). In other words, the models built for data set 1[r] ... See full document
55
J. Braz. Chem. Soc. vol.20 número4
... The optimization step was carried out using a two-level full factorial design, involving the followings factors: pyrolysis time (10 s) and temperature (600 o C), atomization temperatu[r] ... See full document
7
J. Braz. Chem. Soc. vol.20 número4
... In this paper, an electrochemical impedance immunosensor for the detection of the Phakopsora pachyrhizi fungus was developed aiming at the diagnosis of Asian rust on soybe[r] ... See full document
7
J. Braz. Chem. Soc. vol.20 número4
... 1. Fleming, I.; Barbero, A.; Walter, D.; Chem. Rev. 1997, 97, 2063; Nishigaichi, Y.; Takuwa, A.; Naruta, Y.; Maruyama, K.; Tetrahedron 1993, 49, 7395; Panek, J. S.; Xu, F.; Rondon, A. C.; J. Am. ... See full document
54
J. Braz. Chem. Soc. vol.20 número4 pt v20n4a01
... Nestes 20 anos, o JBCS passou por várias trans- formações, começou tímido e hoje ocupa uma posição de destaque no cenário internacional – mais de 50% dos artigos submetidos anualmente são de autores estran- ... See full document
1
J. Braz. Chem. Soc. vol.20 número4
... The hypothesis of this work is that the chemical species of barium in the Brazil nuts would be barium selenate or barium sulfate based on the high concentrations of selenium and sulf[r] ... See full document
10
J. Braz. Chem. Soc. vol.20 número4
... the cross-validation process. Each model was evaluated 25 times by measuring its accuracy in predicting the activity of the remaining 10% and 20% data set compounds. The results confirmed the stability and ... See full document
11
J. Braz. Chem. Soc. vol.20 número4
... In an attempt to correlate physicochemical parameters (reduction potentials and calculated log P) with cytotoxic activity, electrochemical studies were conducted in acetate buffer, pH [r] ... See full document
10
J. Braz. Chem. Soc. vol.20 número4
... section of each filter was cut and placed into 10 mL amber flasks with 4 mL of a 3:1 acetonitrile/dichlorometane mixture (HPLC grade J. T. Baker, USA) being extracted for 10 minutes under ultrasonication. Extracts ... See full document
13
J. Braz. Chem. Soc. vol.20 número4
... The corresponding isotherms shown in Figure 7 demonstrate that natural smectite differs from those anchored with nitrogen and sulfur basic atoms attached to the pendant [r] ... See full document
10
J. Braz. Chem. Soc. vol.20 número4
... Silicas metalized with titanium or zirconium oxides have been explored as supports for preparation of stationary phases having polysiloxanes and other pre-formed polymers immobi[r] ... See full document
9
J. Braz. Chem. Soc. vol.20 número4
... state vanadium alkoxides, such as non-oxo vanadium(III)/ (IV) compounds, to be employed as direct precursors of less common oxides without the use of reducing reaction.. conditions.[r] ... See full document
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