The extraction procedures which have been successfully employed in the preparation of a florigenic principle from the tissues of Xanthium, are applicable to the derivation of an entity of similar activity from Calonectria culture. The Xanthium principle is acedic, with pK(a) values characteristic of a carboxylic acid (6). Although definitive chemical comparisons have not been completed, the ext...

The antiplasmodial active extract of Xanthium cavanillesii contains 3,4-dicaffeoyl quinic acid (3,4-DCQA), 3,5-dicaffeoyl quinic acid (3,5-DCQA) and 1,3,5-tricaffeoyl quinic acid (1,3,5-TCQA). These results inspired us to investigate the interaction of these molecules with a promising validated target of Plasmodium, PfATP6 orthologue of mammalian Ca+2-ATPase. Models of this receptor were obtain...

(2840) Lilium dauricum Ker Gawl. in Bot. Mag. 30: ad t. 1210. 1 Jul 1809, nom. cons. prop. Lectotypus (hic designatus): [icon in] 22: 872. Sep 1805. (≡) pensylvanicum 1805, rej. L. (Sp. Pl.: 302. 1753), a genus of Liliaceae, contains about 120 species distributed North America, East Asia, and Europe (Liang & Tamura Wu Raven, Fl. China 24: 73. 2000). The the have long drawn great attention field...

It has been shown previously ( 15) that photoperiodic induction in Xanthium is inhibited by application of the pyrimidine, 5-fluorouracil (5-FU). More recently (1) it has been demonstrated that the process which is inhibited by 5-FU and which is related to the process of flowering, is the synthesis of ribonucleic acid (RNA) in the Xanthium bud during the first part of the inductive dark period....

Efeito de métodos de extração de compostos fenólicos de Xanthium strumarium L. e suas atividades antioxidantes. The effect of extraction methods and solvents on overall yield, total phenolic content, antioxidant activity, and the composition of the phenolic compounds in Xanthium strumarium extracts were studied. The antioxidant activity was determined by using 2,2-diphenyl-1-picrylhydrazyl radi...

Examination of the bulbs of Lilium pumilum (Liliaceae) led to the isolation of four novel steroidal glycosides (1-4) with a 2,3,4-trisubstituted β-d-glucopyranosyl unit. In 1 and 3, the α-L-arabinopyranosyl moiety is linked to C-3 of the inner trisubstituted β-D-glucopyranosyl group and is present as an usual ⁴C₁ conformation. In contrast, in 2 and 4, the α-L-arabinopyranosyl moiety, which is a...

LpGPAT was obtained from L. pensylvanicum using RT-PCR and rapid amplification of cDNA ends. The cloned full-length cDNA was 1544 bp; it encoded 410 amino acids and had a molecular size of 46 KDa. The nucleic acid sequence analysis showed that it shared high homology with other known GPATs. SMAT result suggests that there is a PlsC that exists in 176-322 amino acid sequence of LpGAPT; it means ...