12 documents found, page 1 of 2

Orla. Experimentações em narrativa sequencial

ORLA é uma exposição e uma publicação online que resultam de alguns trabalhos propostos pelos alunos, em consequência de exercícios e reflexões realizados no contexto da UC Ilustração e Narrativa Visual, do 1 ° semestre do 1 ° ano da Licenciatura em Artes Plásticas.

Effects of some natural 5-hydroxy-isoflavones on cultured human endothelial cel...

Due to their biological activity, it has been suggested that consumption of isoflavone-rich diets may prevent prostate and breast cancers, osteoporosis and cardiovascular diseases. Preventive effects of isoflavones on cancer and cardiovascular diseases have been associated with their oestrogenic and antioxidant properties. However, concerns still exist about the potential dangers of consuming high levels of the...

A new Delta(7,22) sterol from the bulbs of Autonoe madeirensis

The spectral data of a new Delta(7,22) sterol, 24S-ethyl-5 alpha-cholesta-7,22E-dien-3 alpha-ol beta-galactopyranoside, isolated from the bulbs of Autonoe madeirensis, are reported. (c) 2005 Elsevier B.V. All rights reserved.

Flavonoids of an extract of Pterospartum tridentatum showing endothelial protec...

Pterospartium tridentatum is a Leguminosae that grows spontaneously in Portugal. The flowers are used in popular medicine for the treatment of throat irritation conditions and in herbal mixtures for diabetes. Diabetic vascular complications are due, among

Caracteres morfoanatómicos e químicos da carqueja

2-(4 '-aminobenzenamine)-pyrimidine, a new alpha-antagonist from Autonoe madeir...

A new natural pyrimidine derivative, 2-(4'-aminobenzenamine)pyrimidine (1), was isolated from the bulbs of Autonoe madeirensis, a Hyacinthaceae of the Madeira Archipelago (Portugal) and the structure determined on the basis of spectroscopic data. As some pyrimidine compounds are important alpha(1)-adrenergic antagonists, we investigated the effect of 1 on rat vas deferens contractility induced by the alpha(1)-a...

Chemotaxonomic analysis of the genus Cryptolepis

A chemotaxonomic study is made on the basis of a phytochemical screening of the leaves of 60% of the African Cryptolepis species and the review of the secondary metabolites identified in the genus Cryptolepis, subfamily Periplocoideae and related families Asclepiadaceae and Apocynaceae. Our study indicates that the chemistry of the genus Cryptolepis is in agreement with its taxonomic position within the taxon P...

Caracterização química do decocto das flores de Carqueja e estudo in vitro do s...

Structural elucidation of natural 2-hydroxy di- and tricarboxylic acids and est...

The chemical composition of Autonoe madeirensis bulbs was characterized as part of a systematic phytochemical study of this species. The compounds reported were mainly identified on the basis of gas chromatography/electron ionization, electrospray ionization and tandem mass spectrometry. The structures of the pure compounds were also characterized by means of other physical and spectroscopic data (m.p., IR, UV,...

Antiplasmodial activity of Cryptolepis sanguinolenta alkaloids from leaves and ...

The roots of Cryptolepis sanguinolenta have been investigated for their chemical composition since 1931 but so far no studies on the leaves have been reported although they are used in traditional medicine in Guinea-Bissau. Two new alkaloids identified as cryptolepinoic acid (1) and methyl cryptolepinoate (2) and the known alkaloids cryptolepine (4), hydroxycryptolepine (5/5a) and quindoline (6), were isolated ...