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J. Braz. Chem. Soc. vol.18 número2 en a01v18n2
... The report indicates that the average temperature of our planet has already risen 0.7 degrees centigrade over the last 100 years, with certain areas suffering an increase of more than 2 [r] ... See full document
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J. Braz. Chem. Soc. vol.18 número2
... remaining carbonyl group at δ 160.0 was assigned to a lactone moiety of a coumarin-like skeleton. The positions of the hydroxyl groups were assigned to carbons 6 and 7, as in esculetin (3). The methyl ester group might ... See full document
4
J. Braz. Chem. Soc. vol.18 número2
... Acetonitrile and methanol, both HPLC grade, were obtained from J. T. Baker (Deventer, NE). Ultrapure water from EASYpure Barnsted (Dubuque, IA, USA) was used in all procedure steps. Ammonium formate ... See full document
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J. Braz. Chem. Soc. vol.18 número2
... The sandwich porous anodic alumina membranes (PAA/Al 2 O 3 /PAA) can be simply and rapidly fabricated from aluminum foil through a two-step oxidation process. The current vs[r] ... See full document
4
J. Braz. Chem. Soc. vol.18 número2
... Zinc and copper reference solutions were prepared from Titrisol standard solutions (Merck, Darmstadt, Germany). Analytical grade concentrated hydrochloric (30%, m/v) and nitric acids (65%, m/v), hydrogen peroxide (30%, ... See full document
6
J. Braz. Chem. Soc. vol.18 número2
... Therefore, the temperature of 110 °C, established as standard in the EN 14112 method, seemed to be not adequate for evaluating the oxidation stability of biodiesel samples containing BHA. Therefore, it is possible ... See full document
8
J. Braz. Chem. Soc. vol.18 número2
... Uncertainty components (Figure 2) were quantified for each step of the analytical procedure as follows: weighing operation, dilution effects, measuring nickel ions by flame atomic absorp[r] ... See full document
7
J. Braz. Chem. Soc. vol.18 número2
... The results have indicated that the modified copolymers present better 4-nitrophenol removal capacity (see Table 5). Additionally, the C3Q1 resin had the best removal capacity and reache[r] ... See full document
6
J. Braz. Chem. Soc. vol.18 número2
... (maceration at room temp., one week each solvent). The solvents were evaporated in vacuum yielding black syrups. Two g of the 80% MeOH extract of P. argenteus var. argenteus were redissolved in MeOH and subjected to gel ... See full document
3
J. Braz. Chem. Soc. vol.18 número2
... 13. Swingle, K. F.; Hamilton, R.R.; Harrington, J.K.; Kvam, D.C.; Arch. Int Pharmacodyn. Ther. 1971, 189, 129; Scheigetz, J.; Zamboni, R.; Roy, B.; Synth. Commun. 1995, 25, 2791; Riendeau, D.; Charleson, S.; ... See full document
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J. Braz. Chem. Soc. vol.18 número2
... now describe the isolation and characterization of two new diterpenes abietanes derivatives, 3 β -hydroxy-9 α , 13 α - epidioxyabiet-8(14)-ene ( 1 ) and 3-oxo-9 α , 13 α - epidioxyabiet[r] ... See full document
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J. Braz. Chem. Soc. vol.18 número2
... 7. Amaro-Luis, J. M.; Ramirez, I.; Delgado-Méndez, P.; Jorge, Z. D.; J. Braz. Chem. Soc. 2002, 13, 352; Chang, J.; Xuan, L- J.; Xu, Y-M.; Zhang, J-S.; J. ... See full document
4
J. Braz. Chem. Soc. vol.18 número8 en a01v18n8
... community has wisely used the resources entrusted to them by the CNPq/NAS (National Academy of Science) and PADCT (Support to Scientific and Technological Development Program) 4 and has[r] ... See full document
1
J. Braz. Chem. Soc. vol.18 número6 en a01v18n6
... To carry out conversion of the cellulosic and hemicellulosics to ethanol, or to recover energy from lignin, or to produce fuels other than ethanol (eg. biobutanol, hydrogen) or to use th[r] ... See full document
1
J. Braz. Chem. Soc. vol.18 número8
... É chegada a hora da Sociedade Brasileira de Química mostrar, mais uma vez, que está estruturada e qualificada para enfrentar o desafio da construção do perfil de um profissional de Quími[r] ... See full document
1
J. Braz. Chem. Soc. vol.18 número8
... This is that the quinones were said to be freed of contaminating phenols by washing a chloroform solution of the crude reaction mixture with 5% NaOH.. This cannot be correct as quinones [r] ... See full document
1
J. Braz. Chem. Soc. vol.18 número8
... In this study, a 2 4 full factorial design with two pseudo-central points was used with the aim of determining the importance of three quantitative factors (pH, scan rate, and electroly[r] ... See full document
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J. Braz. Chem. Soc. vol.18 número2
... Natural and semi-Synthetic Clerodanes of Croton cajucara and their Cytotoxic Effects against Ehrlich Carcinoma and Human K562 Leukemia Cellsc. Maria Aparecida M.[r] ... See full document
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J. Braz. Chem. Soc. vol.18 número2
... O relatório indica que a temperatura média de nosso planeta já aumentou 0.7 graus centígrados nos últimos 100 anos, com algumas áreas sofrendo um aumento de 3 graus centígrados, como em [r] ... See full document
1
J. Braz. Chem. Soc. vol.18 número2
... It was demonstrated that the present hyphenated technique, using a continuous mode hydride generation gas phase in situ trapping on an integrated silica tubes trap, followed by atomizat[r] ... See full document
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