13C NMR analysis of alkaloids from peschiera fuchsiaefolia

A new indole alkaloid isolated from Tabernaemontana hystrix steud (Apocynaceae)

“…5,6 The similarity of the alkaloids reported in this work in comparison with those from two other Brazilian Tabernaemontana species is remarkable. From T. solanifolia were reported the alkaloids: isovoacangine, isovoacristine, coronaridine, voacangine, voacangine hydroxyindolenine, heyneanine, voacamine, voachalotine and 12-methoxy-Nb-methylvoachalotine [reported under the name Peschiera campestris (Rizz.)…”

“…Miers. 5,6 As part of our continuing interest in the phytochemical investigation of Tabernaemontana species occurring in Brazil, [7][8][9] we decided to study T. hystrix, a native species of the Atlantic forest in Southeastern Brazil, popularly known as "esperta".…”

Aromatic chemical shifts in ar‐hydroxy‐ and ‐methoxy‐substituted indole alkaloids; reference data and substituent‐induced chemical shifts for ten different chromophoric groups

“…By far the largest group of alkaloids studied is that having an indole chromophore, but this group includes alkaloids with very diverse structures. It was at first thought that these various structural types would need to be considered separately but, since calculation showed that the SCS values for the different types were similar, the compounds have been dealt with as one group, consisting of the following types 12,23,29,79,98,112 two indole c h r o r n o p h~r e s ;~~~~~~~~.~~ various dimers, one half of which has an indole moiand miscellaneous alkaloids with an indole chromophore not belonging to the preceding…”

Length-weight relationship, condition factor and size composition of Periophthalmus barbarus (Linneaus 1766 ) in New Calabar River, Nigeria

“…They range from feeding, spawning, food nutrient composition, and fat accumulation (Lizama and Ambrosio, 2002). Braga and Filho (1990) showed that monthly values decreased at the highest reproductive level. This indicates a stoppage in feeding during this period and use of lipid reserves for spawning.…”