[PDF] Top 20 Quím. Nova vol.36 número6

... No Brasil, a linha divisória é muito nítida em muitas áreas. A química, no entanto, alcançou um significativo recobrimento entre as duas rotas. Os cientistas mais destacados, embora publicando intensamente em expressivos ... See full document

... Higher alcohols (n-propyl, iso-butyl, and iso-amyl), acetaldehyde, ethyl acetate and methanol were determined by a Thermo/Trace GC Ultra gas chromatograph equipped with flame ionization detector (FID) and Carbowax 20M ... See full document

... 7-9 Por lo que en este trabajo se sintetizaron hidrogeles microestructurados de acrilamida, con partí- culas de n-isopropilacrilamida, estos hidrogeles fueron preparados en dos etapas[r] ... See full document

... Using the Rich and Suter diagram for the second transition period (Figure 1b), it is also easy to explain why Pd has a 5s 0 4d 10 electron configuration. Because the two levels 4dα a[r] ... See full document

... The results obtained by ICP-SFMS for the U concentration were reasonably in accordance with the target values of U provided by the PROCORAD 2010 urine samples, although the results obt[r] ... See full document

... The results of this study clearly demonstrate that polyamide column chromatography combined with HSCCC is an efficient method for the separation and purification of polyphenols from th[r] ... See full document

... After determining the accuracy of the proposed SPE method, the method was applied to the determination of environmental trace Cu(II) ions in rice, tea, and tobacco as solid samples and[r] ... See full document

... If the t -test 3 was used, which is incorrect, the comparison of the methods would not be considered equivalent, because, to the 95% confidence level, the value of t calculated (3.[r] ... See full document

... Using the same magnetic parameters set optimized for a simulation model with one or two components, we analyzed the influence of the addition of 40 mol % cholesterol to the DPPC membr[r] ... See full document

... Water in the catchment was contaminated to varying degrees by agrochemicals with active ingredients imidacloprid, atrazine, clomazone, iprodione, and chlorpyrifos detected in the creek[r] ... See full document

... The antifungal activities of the new compounds 1 - 4 were evaluated in vitro against Candida albicans , Candida tropicalis and Colletotrichum gloeosporioides.. EXPERIMENTAL General[r] ... See full document

... pomifera , the most studied spe- cies of the genus, several flavonoids have been described, including isoflavones from the fruits, root, bark, and heartwood of the plant.. 8-13 Five pre[r] ... See full document

... In addition, a novelty of this study is the use of PSO to not only reach the relevant lags used in the prediction, but also to determine the best neural network architecture to forecas[r] ... See full document

... 10. Martins, D.; de Alvarenga, M.; Roque, N. F.; Felício, J. D.; Quim. Nova 1995, 18, 14; Block, S.; Stévigny, C.; De Pauw-Gillet, M. C.; de Hoffmann, E.; Llabrès, G.; Adjakidjé, V.; Quetin-Leclercq, J.; Planta ... See full document

... HPLC-PDA monitoring of alkaloid isomerization after heating under reflux of pentacyclic oxindole alkaloid (POA) (a) and tetracyclic oxindole alka- loids (TOA) (b) in dynamic maceration ([r] ... See full document

... As shown in Figure 4, the calcination heating rate had little effect on particle size.. With increasing calcination heating rate, the size ba- rely increased (i.e., from 95 to 98 nm).[r] ... See full document

... The Aloe vera/chitosan/vitamin E/polysorbate 80 (4/50/36/10 w/w/w/w) microparticles were prepared as follows: i) chitosan was dissolved in acetic acid (1%); ii) Aloe vera, vitamin E, and polysorbate 80 were added ... See full document

... El óxido de circonio puro adsorbe muy poco amoniaco (970 µmol NH 3 /g), sin embargo, con la incorporación del H 3 PW 12 O 40 la adsorción de amoniaco aumenta en el material ZH500 (15[r] ... See full document

... However, statistically significant differences were observed between the PM10 mean concentrations pairs (E–SW), (S–SW), and (SE–SW) at the 95.0% confidence level associated with wind d[r] ... See full document

... 13 Siguiendo este orden de ideas un ajuste funcional del con la temperatura mediante la ecuación cuadrática es presentado en la ecuación (3) y sus constantes de ajuste en la Tabla [r] ... See full document