J. Braz. Chem. Soc. vol.19 número5

A new lactonic triterpene isolated from the heartwood of Austroplenckia populnea (Celas- traceae) was characterized as 3 α -hydroxyolean-12-en-29,22 α -olide (the γ -lactone of the

In our continuing program to discover more biologi- cally potent 1,2,4-oxadiazoles 12b,c , we attempted to synthe- size oxadiazoles having an amino acid function attached at C-5

exchange process, the Fe(III) ions are fixed at specific positions of the support surface, in a highly dispersed form, since no change on the surface area was observed after the

The maximum amount of adsorbed intermediates formed during allyl alcohol adsorption on the electrode surface, was observed at the adsorption potential, Eads = 0.00 V

In this work, rain water particulate material was monitored in two sites in Rio de Janeiro State (Brazil): the first (Sepetiba), subjected to high inputs of metals from

We have studied the bevahior of the phenomenological 4f-4f intensity parameters in compounds of the Nd 3+ ion with glycine, L-aspartic acid, L-glutamic acid, L-histidine, DL-malic

It is much enhanced after complexation due to the charge-flux term; (vii) the calculated intermolecular stretching frequencies are in very good agreement with the experimental

Potentiometric selectivity coefficients for iron(III) ion-selec- tive electrode (log K Fe,X pot ) in 1.0 mol/L citrate solution, determined by separate solutions method 16,17 at 5.0