Navegando por Palavras-chave "Croton"

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    Alkaloids from croton echinocarpus baill.: Anti-hiv potential
    (Elsevier science bv, 2016) Ravanelli, N.; Santos, Kátia P.; Motta, Lucimar Barbosa da; Lago, Joao Henrique Ghilardi [UNIFESP]; Furlan, Cláudia Maria
    Croton belongs to the Euphorbiaceae genus, one of the major Angiosperms families, and is widely distributed throughout the world, especially in the tropics. In this study, the hydroalcoholic extract (70% EtOH) of Croton echinocarpus leaves afforded two alkaloids: corydine and norisoboldine, and their structures were established by spectroscopic data interpretation (UV, IR, NMR and LREIMS). Both alkaloids displayed significant in vitro anti-HIV potential, inhibiting 40% of the HIV-1 reverse transcriptase enzyme activity at a concentration of 100 mu g mL(-1) of norisoboldine and 450 mu g mL(-1) of corydine. Corydine showed IC50 of 356.8 mu g mL(-1), while norisoboldine was more efficient on inhibiting the RT activity, showing IC50 of 153.7 mu g mL(-1). (C) 2015 SAAB. Published by Elsevier B.V. All rights reserved.
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    Diversidade e biogeografia das espécies arbóreas da tribo Crotoneae (Euphorbiaceae) na floresta atlântica
    (Universidade Federal de São Paulo, 2016-06-17) Santos, Rafaela Freitas dos [UNIFESP]; Caruzo, Maria Beatriz Rossi [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The Atlantic Forest is considered one of the world's hotspots of biodiversity and, even with the growing threat to its ecosystems, has a high level of biological diversity and endemism. Euphorbiaceae is one of the largest, most diverse and complex families of Angiosperms, with about 6300 species in almost all regions of the planet. The family has great importance in brazilian flora with almost 1000 occurring in all phytogeographical domains of the country, being one of the most diverse botanical families within Atlantic Rain Forest. The genera of the tribe Crotoneae occurring in the Atlantic Forest are the following: Astraea, Brasiliocroton and Croton. Among them, Croton is considered one of the most diverse angiosperm genera within the Atlantic Forest. Considering the high diversity and importance of Crotoneae tribe in the Atlantic Forest, this work aimed: to carry out a survey of arborescent species of the tribe occurring on that phytogeographical domain, identify the distribution patterns and areas of endemism of those species in the Atlantic Forest and evaluate their conservation status. Based on the analysis of herbaria material and observations of the species in their natural habitats, were recognized 24 arborescent species of the tribe Crotoneae in the Atlantic Forest, which about 77% are endemic to this phytogeographical domain. The genera with are with arborescent representants in the Atlantic Forest are: Brasiliocroton, with two species , and Croton, with 22 species (of which 4 occurs beyond the limits of the Atlantic Forest domain). These species are distributed in two patterns: species of South Atlantic Foresta and the Northern Atlantic Forest, separate for Doce river. Two areas of endemism were detected for the studied taxa: Bahia, bounded by the Doce river and Baia de Todos os Santos, and Serra do Mar, with altitudinal gradient as possible barriers. Therefore, this study increased the knowledge of Crotoneae tribe of genres in Brazil and in the Neotropics.
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    Diversity of arborescent lineages of Crotoneae (Euphorbiaceae) in the Brazilian Atlantic Rain Forest
    (Springer Wien, 2017) dos Santos, Rafaela F. [UNIFESP]; Riina, Ricarda; Rossi Caruzo, Maria B. [UNIFESP]
    We conducted fieldwork and herbarium research to investigate the morphological diversity, taxonomy, and geographic distribution of arborescent lineages of tribe Crotoneae (Euphorbiaceae) in the Brazilian Atlantic Rain Forest domain, a neotropical region considered one of the world's hot spots of biodiversity. We found that arborescent lineages of Crotoneae are represented in the Atlantic Rain Forest by two genera (Croton and Brasiliocroton) and 23 species. Of this total, 70% of the species are endemic to the Atlantic Rain Forest. The genus Brasiliocroton, which is endemic to Brazil, includes two species, and Croton is represented by 21 species. We provide identification keys, update morphological description of key characters, include pertinent taxonomic comments, and illustrate most of the studied species with live photographs to facilitate taxonomic identification. The conservation status of each species is also evaluated. We establish five new synonyms, one superfluous name, and nine lectotypifications.