Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 12
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Actividad antioxidante de algas y plantas marinas de la plataforma insular cubana OceanDocs
Valdés, O.; Hernádez, Y.; Fernández, M.D.; Hernández, I.; Rodriguez, M.; Cano, M.; Laguna, A.; Díaz, C.; Cabrera, B..
En el presente trabajo se estudia la capacidad antioxidante de varios extractos, acuosos e hidro-alcohólicos obtenidos a partir de algas y plantas marinas de la plataforma insular cubana. A todos los extractos se les determinó su contenido de polifenoles, proteínas, lípidos y azúcares totales, así como la actividad Superóxido Dismutasa (SOD). Todos los extractos evaluados mostraron una buena actividad antioxidante, con una CE50 inferior de 0,4 mg.ml-1. El contenido de polifenoles en los extractos de Ulva fasciata es menor el de las otras especies, aunque tanto el extracto hidro-alcohólico como el del alga seca e irradiada de dicha especie presentan una buena actividad antioxidante. El extracto hidro-alcohólico de Thalassia testudinum presenta el mayor...
Tipo: Journal Contribution Palavras-chave: Proteins; Antioxidants; Proteins; Antioxidants; Http://aims.fao.org/aos/agrovoc/c_6259; Http://aims.fao.org/aos/agrovoc/c_511.
Ano: 2008 URL: http://hdl.handle.net/1834/2820
Imagem não selecionada

Imprime registro no formato completo
Actividad antioxidante del alga Ulva fasciata Delile sometida a distintos niveles de contaminación marina OceanDocs
Hernández, Y.; Laguna, A.; Fernández, M.D.; Valdés, O.; Regalado, E.L..
Ha sido demostrado, por otros autores, que el alga Ulva fasciata Delile posee una actividad antioxidante promisoria y en el presente trabajo evaluamos si la actividad antioxidante de muestras de esta alga puede ser influenciada por la adsorción de metales, pesados y otros por parte del alga. U. fasciata fue colectada en tres zonas de las costas de la Ciudad de la Habana que presentan diferentes niveles de eutrofización: 1) la desembocadura del Río Quibú, un río que atraviesa una importante zona industrial de la capital cubana y en la cual la concentración de metales acumulados por el alga fue mayor; 2) la zona del Malecón habanero, que recibe la contaminación de la bahía de la Habana y del Río Almendares pero no de forma directa, donde presentó valores...
Tipo: Journal Contribution Palavras-chave: Algae; Marine environment; Heavy metals; Marine environment; Heavy metals; Algae; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2008 URL: http://hdl.handle.net/1834/2919
Imagem não selecionada

Imprime registro no formato completo
Bromopyrrole alkaloids from the Caribbean sponge Agelas cerebrum OceanDocs
Regalado, E.L.; Laguna, A.; Mendiola, J.; Thomas, O.P.; Nogueiras, C..
Bioguided fractionation of Agelas cerebrum crude extract resulted in isolation of four bromopyrrole and four bromopyrrole aminoimidazole alkaloids, identified as 5-bromopyrrole-2-carboxylic acid (1), 4-bromopyrrole-2-carboxylic acid (2), 3,4-bromopyrrole-2-carboxylic acid (3), 4,5-bromopyrrole-2-carboxylic acid (4), oroidin (5), bromoageliferin (6), dibromoageliferin (7) and dibromosceptrin (8) on the basis of spectroscopic data analyses (UV, IR, HRMS, 1D and 2D NMR) and comparison with literature data. This is the first report of compounds 2 and 3 in a marine sponge belonging to the Agelas genus and the first evidence of the presence of 1 from a natural source.
Tipo: Journal Contribution Palavras-chave: Alkaloids; Sponges; Chemistry; Chemistry; Alkaloids; Sponges; Http://aims.fao.org/aos/agrovoc/c_1522; Http://aims.fao.org/aos/agrovoc/c_269; Http://aims.fao.org/aos/agrovoc/c_7321.
Ano: 2010 URL: http://hdl.handle.net/1834/3862
Imagem não selecionada

Imprime registro no formato completo
Caribbean marine biodiversity as a source of new compounds of biomedical interest and others industrial applications OceanDocs
Nuñez, R.; Garateix, A.; Laguna, A.; Fernández, M.D.; Ortiz, E.; Llanio, M.; Valdés, O.; Rodríguez, A.; Menéndez, R..
The Cuban marine flora and fauna is characterized by its richness in species that represents an extraordinary natural source of unexplored biomolecular diversity. Many of those biomolecules could represent important tools for industrial applications. For this reason, in our Centre the main aim was focused on the isolation, purification and characterization of bioactive compounds present in marine invertebrates with particular emphasis on sponges, cnidarians, seaweeds and marine plants. Micro organisms represent also an important source of biologically active compounds that were included in our studies. In our Institution, research is performed by a multidisciplinary team. The purpose of this article is to review the most important results of the Centre of...
Tipo: Journal Contribution Palavras-chave: Marine organisms.
Ano: 2006 URL: http://hdl.handle.net/1834/3649
Imagem não selecionada

Imprime registro no formato completo
Decoloración de alginato de sodio extraído de las algas pardas marinas del género sargassum con el uso de peróxido de hidrógeno OceanDocs
Regalado, E.L.; Laguna, A.; Torres, M.; Sabatier, J.D.; Hernández, M.; Ferrer, A.E.; Nogueiras, C..
Hydrogen peroxide bleaching of sodium alginate from seaweeds oh the Sargassum genus was studied. The influence of H2O2 concentration (percentage of H2O2 on a dry weight alginate basis, w/w) and NaOH/H2O2 ratio (% NaOH/% H2O2, both referred to a dry weight alginate basis, w/w) on the molecular weight, color removal and content of Fe3+ ions of bleached alginate samples was investigated by UV and IR spectroscopies, colorimetric determination of Fe3+ ions and vapor pressure osmometry. Higher yield, purity and molecular weight of alginate were obtained using 3% (or less) of hydrogen peroxide and a NaOH/H2O2 ratio of 1.2 for bleaching.
Tipo: Journal Contribution Palavras-chave: Bleaching; Bleaching; Http://aims.fao.org/aos/agrovoc/c_953.
Ano: 2007 URL: http://hdl.handle.net/1834/3855
Imagem não selecionada

Imprime registro no formato completo
Efecto antioxidante y contenido polifenólico de Syringodium filiforme (Cymodoceaceae) OceanDocs
González García, K.L.; Valdés Iglesias, O.; Laguna, A.; Díaz Martínez, M.; González Lavaut, J.A..
The marine phanerogam Syringodium filiforme, known as “manatee grass”, is a common species that grows in coastal areas associated to Thalassia testudinum. With the aim to describe some of its possible chemical characteristics, this study was performed with a sample of 1.2kg, collected in March 2009, in Guanabo beach, Havana, Cuba. The sample was dried (less than 12% humidity) and a total extract prepared; other three extracts were prepared with the use of solvents of increasing polarity. The phytochemical screening and analytical determinations of each fraction were undertaken Total polyphenol content was determined using pyrogallol as reference´s standard; chlorophyll a and b and anthocyanin content were also quantified. Total extract and fractions...
Tipo: Journal Contribution
Ano: 2011 URL: http://hdl.handle.net/1834/3910
Imagem não selecionada

Imprime registro no formato completo
Efectos neurofarmacológicos de extractos de algas marinas. OceanDocs
Garateix, A.; García, T.; Buznego, M.T.; Ruenes, K.; Valdés, O.; Laguna, A.; Hernández, Y.; Guzmán, F.; Palmero, A.; Pérez-Saad, H..
Las algas constituyen un recurso natural de gran variedad y abundancia en los arrecifes coralinos cubanos. En la literatura científica han sido descritos efectos de extractos y compuestos aislados de algas pardas sobre el Sistema Nervioso Central, entre ellos, acciones depresora, antidepresiva y anticonvulsivante. En este estudio se presentan los resultados obtenidos en la evaluación neurofarmacológica de los extractos etanólicos (10%) procedentes de las algas pardas: Dictyota pinnatifida y Turbinaria turbinata sobre la conducta exploratoria, tiempo de sueño inducido por tiopental y prueba de esconder esferas. Se utilizaron ratones, albinos, machos, de la línea OF-1, de peso corporal entre 18 y 22 gramos y se emplearon dosis de 40, 200 y 1000 mg/kg, por...
Tipo: Preprint
Ano: 2000 URL: http://hdl.handle.net/1834/3644
Imagem não selecionada

Imprime registro no formato completo
Las esponjas marinas como fuente de nuevas sustancias bioactivas. OceanDocs
Regalado, E.L.; Laguna, A.; Martínez, J.R..
Marine sponges (Porifera) have drawn the attention from a broad number of researchers all over the world. These animals and their simbionts are specialized in chemical warfare, producing biologically active chemical substances as an effective defense against predators. They have been considered a goldmine to chemists, from which have been discovered more than 6000 novel structures; many of them, with enormous biomedical applications, mainly against cancer, but also against bacteria, viruses and other diseases. Some of the sponge-derived drugs are available in the market, such as: Ara-A (antiviral) and Ara-C (anticancer), but there are diverse bioactive compounds under clinical trials. In Cuba, the researches related to the isolation of compounds from...
Tipo: Journal Contribution Palavras-chave: Sponges; Organic compounds; Antiparasitic agents.
Ano: 2010 URL: http://hdl.handle.net/1834/4129
Imagem não selecionada

Imprime registro no formato completo
Marine sponges as a source of new bioactive substances OceanDocs
Regalado, E.L.; Laguna, A.; Martínez, J.R..
Las esponjas marinas (Porifera) han atraído la atención de un gran número de científicos alrededor del mundo. Estos animales y sus simbiontes utilizan mecanismos de defensa química, basados en la producción de compuestos biologicamente activos que utlizan para protegerse de posibles depredadores. Son considerados una mina de oro para los químicos y se han descubierto más de 6000 estructuras novedosas, muchas de ellas con enormes aplicaciones biomédicas, fundamentalmente contra el cáncer, pero también contra diversas bacterias, virus y otras enfermedades. Algunos de los fármacos derivados de esponjas se encuentran disponibles en el mercado, tal es el caso Ara-A (antiviral) y de la Ara-C (antitumoral), pero existen diversos compuestos bioactivos en...
Tipo: Journal Contribution Palavras-chave: Sponges; Chemical compounds; Bioactive compounds; Chemical compounds; Sponges; Http://aims.fao.org/aos/agrovoc/c_49870; Http://aims.fao.org/aos/agrovoc/c_7321.
Ano: 2010 URL: http://hdl.handle.net/1834/4039
Imagem não selecionada

Imprime registro no formato completo
Polar Alkaloids from the Caribbean Marine Sponge Niphates digitalis OceanDocs
Regalado, E.L.; Mendiola, J.; Laguna, A.; Nogueiras, C.; Thomas, O.P..
A method involving flash chromatography, semi-preparative phenylhexyl RP HPLC-DAD-ELSD combined with analytic polar-RP HPLC-DAD, was applied to separate and purify six highly nitrogenated bases and a bicyclic amidine alkaloid, the major components of the marine sponge Niphates digitalis. Their structures were identified as 1,8-diazabicyclo[5.4.0]undec-7- ene (1), deoxycytidine (2), phenylalanine (3), adenosine (4), deoxyguanosine (5), adenine (6) and thymidine (7) on the basis of spectroscopic data analyses. This is the first report of these compounds in a marine sponge belonging to the Niphates genus and the first evidence of the presence of 1 from a natural source.
Tipo: Journal Contribution Palavras-chave: Sponges; Cytotoxicity; Cytotoxicity; Sponges; Http://aims.fao.org/aos/agrovoc/c_34251; Http://aims.fao.org/aos/agrovoc/c_7321.
Ano: 2010 URL: http://hdl.handle.net/1834/3860
Imagem não selecionada

Imprime registro no formato completo
Pulvérisation de boues granulaires traitant des eaux usées de fromagerie IRD
Monroy, O.; Fama, G.; Laguna, A.; Prunier, S.; Macarie, Hervé.
Tipo: Text Palavras-chave: FERMENTATION; ANAEROBIOSE; BOUE; INOCULATION; STATION D'EPURATION.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010007694
Imagem não selecionada

Imprime registro no formato completo
Repair of UVB-Damaged Skin by the antioxidant sulphated flavone glycoside Thalassiolin B Isolated from the marine plant Thalassia testudinum Banks ex König OceanDocs
Regalado, E.L.; Rodríguez, M.; Menéndez, R.; Concepción, A.A.; Nogueiras, C.; Laguna, A.; Rodríguez, A.A.; Williams, D.E.; Lenzo-Luaces, P.; Valdés, O.; Hernandez, Y..
Daily topical application of the aqueous ethanolic extract of the marine sea grass, Thalassia testudinum, on mice skin exposed to UVB radiation resulted in a dose dependent recovery of the skin macroscopic alterations over a 6-day period. Maximal effect (90%) occurred at a dose of 240 μg/cm2, with no additional effects at higher doses. Bioassay-guided fractionation of the plant extract resulted in the isolation of thalassiolin B (1). Topical application of 1 (240 μg/cm2) markedly reduces skin UVB-induced damage. In addition, thalassiolin B scavenged 2,2-diphenyl-2-picrylhydrazyl radical with an EC50=100 μg/ml. These results suggest that thalassiolin B is responsible for the skin regenerating effects of the crude extract of T. testudinum
Tipo: Journal Contribution Palavras-chave: Chemistry; Pharmacology; Chemistry; Pharmacology; Http://aims.fao.org/aos/agrovoc/c_1522; Http://aims.fao.org/aos/agrovoc/c_5760.
Ano: 2009 URL: http://hdl.handle.net/1834/3865
Registros recuperados: 12
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional