Entity

Time filter

Source Type

São Paulo, Brazil

de Felicio R.,University of Sao Paulo | de Albuquerque S.,University of Sao Paulo | Young M.C.M.,Institute Botanica Of Sao Paulo | Yokoya N.S.,Institute Botanica | Debonsi H.M.,University of Sao Paulo
Journal of Pharmaceutical and Biomedical Analysis | Year: 2010

Specimens of the red alga Bostrychia tenella J. Agardh (Rhodomelaceae, Ceramiales) were collected from the São Paulo coast and submitted to room temperature solvent extraction. The resulting extract was fractionated by partitioning with organic solvent. The n-hexane (BT-H) and dichloromethane (BT-D) fractions showed antiprotozoal potential in biological tests with Trypanosoma cruzi and Leishmania amazonensis and presented high activity in an antifungal assay with the phytopathogenic fungi Cladosporium cladosporioides and Cladosporium sphaerospermum. Chromatography methods were used to generate subfractions from BT-H (H01 to H11) and from BT-D (D01 to D19). The subfractions were analyzed by gas chromatography-mass spectrometry (GC/MS), and the substances were identified by retention index (Kovats) and by comparison to databases of commercial mass spectra. The volatile compounds found in marine algae were identified as fatty acids, low molecular mass hydrocarbons, esters and steroids; some of these have been previously described in the literature based on other biological activities. Moreover, uncommon substances, such as neophytadiene were also identified. In a trypanocidal assay, fractions BT-H and BT-D showed IC 50 values of 16.8 and 19.1μg/mL, respectively, and were more active than the gentian violet standard (31μg/mL); subfractions H02, H03, D01 and D02 were active against L. amasonensis, exhibiting IC 50 values of 1.5, 2.7, 4.4, and 4.3μg/mL, respectively (standard amphotericin B: IC 50=13μg/mL). All fractions showed antifungal potential. This work reports the biological activity and identification of compounds by GC/MS for the marine red alga B. tenella for the first time. © 2010 Elsevier B.V. Source


Kelly Koch A.,Institute Botanica Of Sao Paulo | de Rezende Cardoso A.L.,Museu Paraense Emilio Goeldi | Ilkiu-Borges A.L.,Museu Paraense Emilio Goeldi
Check List | Year: 2014

This paper presents new records of Passiflora L. from the Brazilian Amazon, contributing to the knowledge about the taxonomy and distribution of Passifloraceae in Brazil. The following species are reported for the first time: Passiflora garckei Mast. in Brazil; Passiflora candida (Poepp. & Endl.) Mast. in Amapá state; P. retipetala Mast. in Pará state; and P. tholozanii Sacco in Maranhão state. © 2014 Check List and Authors. Source


Mota N.F.O.,Federal University of Minas Gerais | Wanderley M.G.L.,Institute Botanica Of Sao Paulo
Rodriguesia | Year: 2013

Xyris is a genus of about 400 species distributed in tropical regions, reaching temperate areas of the Americas and Australia. The Espinhaço Range concentrates a great wealth of Xyris species; the genus is among the richest of monocots occurring in these mountains. This paper presents a new species of Xyris named for its type locality, the State Park of Rio Preto, located in the far northeast of the Diamantina plateau, in the Espinhaço (Minas Gerais). Illustrations of diagnostic characters, a comparison with morphologically related species, as well as information on ecology and phenology of the new species are provided. Source


Kelly Koch A.,Institute Botanica Of Sao Paulo | De Rezende Cardoso A.L.,Museu Paraense Emilio Goeldi | Ilkiu-Borges A.L.,Museu Paraense Emilio Goeldi
Phytotaxa | Year: 2013

A new species of Passiflora is described from reforested post bauxite-mined area in the National Forest of Saracá-Taquera in the Brazilian state of Pará. The species is illustrated and its affinities with related species are discussed, and a key to the species of supersection Laurifoliae, series Quadrangulares is presented. The series Quadrangulares is composed of four species that constitute a small complex of large-flowered and large-fruited passionflowers with 3-4-angulate-winged stems that occurs naturally in the moist lowlands from Nicaragua to Brazil and French Guiana. However, among the four species of the series, Passiflora trialata is closely related to the new species by the 3-angular stems, the color and shape of sepals and petals, the 3-angular petioles and peduncles, and the single operculum. © 2013 Magnolia Press. Source


In Rio Grande do Sul State green algae are largely unknown and most studies are concentrated in the regions of the Coastal Plain and Central Depression, localitions near Porto Alegre. This paper aims to present the Chlorococcales and Zygnematales species found in a pond at Balneário do Lérmen, Itaára, from June 2004 to June 2005. Samples were collected with a plankton net at four stations of the pond. The water pH ranged between 6 and 8. We identified 43 taxa in specific and infra-specific levels and three taxa in generic level. The taxa Radiococcus planktonicus Lund, Golenkinia paucispina West & West, Closterium turgidum Ehrenberg ex Ralfs, Staurastrum caledonense Hüber-Pestalozzi and Staurastrum cingulum (West & West) Smith var. obesum Smith are first reports for Rio Grande do Sul State. Chlorophyceae, represented by Chlorococcales, showed greatest specific richness with 38 taxa in comparison with Zygnematophyceae (8). Source

Discover hidden collaborations