Echium montenielluense (Boraginaceae), une nouvelle espèce endémique de Corse
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Pyrrolizidine alkaloids from Echium rauwolfii and Echium horridum (Boraginaceae).
Echimidine was isolated from Echium rauwolfii and Echium horridum and identified by MS, 1H- and 13C NMR as a major alkaloid. In addition, structures of 12 minor alkaloids were inferred from GLC and GLC-MS analyses: 7-angeloylretronecine, 7-tigloylretronecine, lycopsamine, 7-acetyllycopsamine, uplandicine, 7-angeloyllycopsamine, 7-tigloyllycopsamine, tigloyl isomer of echimidine, 7-angeloyl-9-(2...
متن کاملPyrrolizidine alkaloids from Echium glomeratum ( Boraginaceae ) By :
The methanolic extract of the whole plant of Echium glomeratum Poir. (Boraginaceae) has afforded five pyrrolizidine alkaloids, three that were (7S, 8R)-petranine (1), (7S, 8S)-petranine (2), and (7R, 8R)-petranine (3a) or (7R, 8S)-petranine (3b), comprising a tricyclic pyrrolizidine alkaloids subclass; and two that were known but to the species: 7-angeloylretronecine (4) and 9-angeloylretroneci...
متن کاملPyrrolizidine alkaloids from Echium glomeratum (Boraginaceae).
The methanolic extract of the whole plant of Echium glomeratum Poir. (Boraginaceae) has afforded five pyrrolizidine alkaloids, three that were (7S, 8R)-petranine (1), (7S, 8S)-petranine (2), and (7R, 8R)-petranine (3a) or (7R, 8S)-petranine (3b), comprising a tricyclic pyrrolizidine alkaloids subclass; and two that were known but to the species: 7-angeloylretronecine (4) and 9-angeloylretroneci...
متن کاملUne nouvelle approche pour la sélection de variables basée sur une métrique d'estimation de la qualité
Résumé. La maximisation d’étiquetage (F-max) est une métrique non biaisée d’estimation de la qualité d’une classification non supervisée (clustering) qui favorise les clusters ayant une valeur maximale de F-mesure d’étiquetage. Dans cet article, nous montrons qu’une adaptation de cette métrique dans le cadre de la classification supervisée permet de réaliser une sélection de variables et de cal...
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ژورنال
عنوان ژورنال: Candollea
سال: 2018
ISSN: 0373-2967
DOI: 10.15553/c2018v732a3