Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Mais filtros











Base de dados
Intervalo de ano de publicação
1.
Mycologia ; 110(2): 434-447, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29792784

RESUMO

In 2010-2011, a Xylaria sp. was documented growing from seeds of both Chlorocardium rodiei and Chlorocardium venenosum, a commercially valuable timber in Guyana. We conducted extensive surveys in 2015-2016, where this Xylaria sp. was observed fruiting from ca. 80% of dispersed seeds in both natural and logged forests in the Upper Demerara-Berbice, Potaro-Siparuni, and the Cuyuni-Mazaruni districts of central Guyana. Species of Xylaria are ascomycetous fungi generally characterized by black, carbonaceous, multiperitheciate ascoma commonly found growing on dead wood. Combined teleomorphic and molecular data indicate that the fungus represents a novel species, described here as Xylaria karyophthora.


Assuntos
Lauraceae/microbiologia , Sementes/microbiologia , Xylariales/classificação , Xylariales/isolamento & purificação , Actinas/genética , Florestas , Guiana , Técnicas Microbiológicas , Microscopia , Filogenia , Reação em Cadeia da Polimerase , RNA Polimerase II/genética , Análise de Sequência de DNA , Xylariales/citologia , Xylariales/genética
2.
Phytochemistry ; 117: 116-122, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26071840

RESUMO

In the course of our screening for new bioactive natural products, a culture of Hypoxylon rickii, a xylariaceous ascomycete collected from the Caribbean island Martinique, was identified as extraordinary prolific producer of secondary metabolites. Ten metabolites of terpenoid origin were isolated from submerged cultures of this species by preparative HPLC. Their structures were elucidated using spectral techniques including 2D NMR and HRESIMS. Three of the compounds were elucidated as new botryanes (1-3) along with three known ones, i.e. (3aS)-3a,5,5,8-tetramethyl-3,3a,4,5-tetrahydro-1H-cyclopenta[de]isochromen-1-one (4), (3aS,8R)-3a,5,5,8-tetramethyl-3,3a,4,5,7,8-hexahydro-1H-cyclopenta[de]isochromen-1-one (5) and botryenanol (6). Further three new sesquiterpenoids featured a 14-noreudesmane-type skeleton and were named hypoxylan A-C (7-9); the diterpenoid rickitin A (10) contains an abietane-type backbone. Compounds 1, 2, 3, 7, and 10 showed cytotoxic effects against murine cells.


Assuntos
Abietanos/isolamento & purificação , Xylariales/química , Abietanos/química , Abietanos/farmacologia , Animais , Cromatografia Líquida de Alta Pressão , Camundongos , Testes de Sensibilidade Microbiana , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Estereoisomerismo , Terpenos/isolamento & purificação , Terpenos/metabolismo , Índias Ocidentais
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA