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Registros recuperados: 26
Primeira ... 12 ... Última
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Actividad antileishmanial de seis extractos de organismos marinos OceanDocs
García Parra, M.; Monzote Fidalgo, C.L.; Castañeda Pasarón, C.O.; García Delgado, N.; Pérez Hernández, A..
Introducción: las infecciones causadas por protozoos del género Leishmania constituyen un problema de salud mundial con una alta prevalencia en países subdesarrollados. En la actualidad no existe una vacuna contra esta enfermedad y el tratamiento utilizado es deficiente, por lo que la búsqueda de medicamentos más efectivos y seguros constituye una urgente necesidad. Objetivo: evaluar la actividad antileishmanial in vitro de 6 extractos acuosos e hidroalcohólicos de organismos marinos. Métodos: se determinó la actividad frente a promastigotes y amastigotes de Leishmania amazonensis, así como su toxicidad frente a macrófagos peritoneales de ratones BALB/c. Resultados: en el ensayo de promastigotes los extractos de Bryothamnion triquetrum, Bunodosoma...
Tipo: Journal Contribution Palavras-chave: Marine organisms; Parasites.
Ano: 2012 URL: http://hdl.handle.net/1834/4508
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Actividades desarrolladas en la colección de bacterias marinas. OceanDocs
Morales, M.; Ortiz, E.; Villaverde, M.; Caballero, V.; Miranda, A.; Fonseca, E.; Núñez, R..
En la Colección de Bacterias Marinas se conservan aislamientos procedentes de diferentes regiones del archipiélago cubano. Aquí se desarrollan actividades de investigación y servicios, entre las primeras se encuentran los estudios para la conservación de las cepas a mediano y largo plazo, la determinación taxonómica de sus componentes, la evaluación de bioactividades con aplicación en la industria médico-farmacéutica y en el saneamiento ambiental y la actualización de la base de datos asociada. Entre las actividades de servicios se encuentran el mantenimiento y caracterización de las cepas, así como el suministro a los usuarios.
Tipo: Journal Contribution Palavras-chave: Marine organisms; Marine environment; Marine environment; Http://aims.fao.org/aos/agrovoc/c_4610.
Ano: 2006 URL: http://hdl.handle.net/1834/2922
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Analyse de l'Etain par Spectrophotometrie d'absortion atomique avec four ectrothermique. Application aux organismes marins ArchiMer
Thibaud, Yves.
The author presents an analysis technique permitting the determination of the tin in the tissues of marine organisms. This technique is only the application of the spectrophotometry of atomic absorption with atomization in the electrothermic oven. After the acid attack of the sample, the solution is put in a graphite oven to atomize the tin selectively and quantitatively. The detection limit obtained, 0,5 mu g/g of the lyophilized flesh is very satisfactory, to show the purport variations in shells from different origins.
Tipo: Text Palavras-chave: Marine organisms; Tin; Antifouling substances; Absorption spectra; Spectroscopic techniques; Pollution detection.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1906.pdf
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Antiproliferative activity of marine stingray Dasyatis sephenvenom on human cervical carcinoma cell line J. Venom. Anim. Toxins incl. Trop. Dis.
Rajeshkumar,RK; Vennila,R; Karthikeyan,S; Prasad,N Rajendra; Arumugam,M; Velpandian,T; Balasubramaniam,T.
AbstractBackgroundVenoms comprise mixtures of numerous bioactive compounds that have a wide range of pharmacologic actions. Toxins from venomous animals have attracted the attention of researchers because of their affinity for primary sites responsible for lethality and their efficacy at extremely low concentrations. The venoms of marine stingrays have not been extensively studied and limited data is available on them. The present study aims to evaluate the antiproliferative and biochemical properties of the venom obtained from a species of marine stingray (Dasyatis sephen) on human cervical cancer cell line HeLa.MethodsThe antiproliferative effect of D. sephen venom was determined by MTT assay, and the oxidative stress was determined by lipid peroxidation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Marine organisms; Membrane potential; Oxidative stress; ROS; Stingray; Venom.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100345
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Aplicación estadística en los bioensayos de toxicidad con sedimentos extraído del Estero Salado, canal de acceso al Puerto Marítimo de Guayaquil OceanDocs
Villamar, F..
With the purpose of proving and determining in a short term the impact of the dredged material that can be caused by the organisms that inhabit the marine-estuary ecosystem, was performed toxicity bioassay of the sediment extracted from the bottom of the Salado Estuary. This sediment obstructs the access channels of the Marítime Port of Guayaquil. For this bioassay, was used white shrimp larvae of the species Litopenaeus vannamei, a commercially important organism that depends for its food on the organic detritus coming from the sediment and the column of estuary water in the studied area. The results obtained were analyzed applying the graphic arithmetic method and statistical analysis, through which it was determined that there is a direct relation...
Tipo: Journal Contribution Palavras-chave: Bioassays; Toxicity; Marine organisms; Sediments; Statistical analysis; Kurtosis; Dredged samples; Bioassays; Toxicity; Statistical analysis; Http://aims.fao.org/aos/agrovoc/c_15731; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_7378.
Ano: 2002 URL: http://hdl.handle.net/1834/2257
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Bioaccumulation of mercury in some marine organisms from Lake Timsah and Bitter Lakes (Suez Canal, Egypt) OceanDocs
El-Moselhy, K.M..
The present work is devoted to determine the level of total mercury in the different tissues of fish Mugil seheli, crab Portunus pelagicus, shrimp Metapenaeus stebbingi, and bivalves Paphia undulata and Gafrarium pectinatum collected from Lake Timsah and Bitter Lakes during spring 2003. In addition, factors affecting the accumulation of mercury in these organisms were studied. Levels of Hg in the edible parts of the investigated organisms showed the ranges 2.62 – 25.45 and 0.94 – 7.94 ng/g wet wt. in fish, 16.02 – 117.26 and 9.86 – 64.18 ng/g wet wt. in crab, 4.55 – 14.67 and 5.76 – 15.58 ng/g wet wt. in shrimp, and 1.06 – 36.31 and 5.38 – 69.59 ng/g wet wt. in bivalves from Lake Timsah and Bitter Lakes, respectively. High accumulation of Hg was recorded...
Tipo: Journal Contribution Palavras-chave: Chemistry Studies; Mercury; Bioaccumulation; Marine organisms; Heavy metals; Bioaccumulation; Mercury; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_4751.
Ano: 2006 URL: http://hdl.handle.net/1834/1451
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Bioactive peptides from marine sources: pharmacological properties and isolation procedures OceanDocs
Aneiros, A.; Garateix, A..
Marine organisms represent a valuable source of new compounds. The biodiversity of the marine environment and the associated chemical diversity constitute a practically unlimited resource of new active substances in the field of the development of bioactive products. In this paper, the molecular diversity of different marine peptides is described as well as information about their biological properties and mechanisms of action is provided. Moreover, a short review about isolation procedures of selected bioactive marine peptides is offered. Novel peptides from sponges, ascidians, mollusks, sea anemones and seaweeds are presented in association with their pharmacological properties and obtainment methods.
Tipo: Journal Contribution Palavras-chave: Marine environment; Marine organisms; Peptides; Bioactive compounds; Marine environment; Peptides; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_5691.
Ano: 2004 URL: http://hdl.handle.net/1834/2921
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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
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Constraints and Priorities for Conducting Experimental Exposures of Marine Organisms to Microplastics ArchiMer
Paul-pont, Ika; Tallec, Kevin; Gonzalez-fernandez, Carmen; Lambert, Christophe; Vincent, Dorothee; Mazurais, David; Zambonino-infante, Jose-luis; Brotons, Guillaume; Lagarde, Fabienne; Fabioux, Caroline; Soudant, Philippe; Huvet, Arnaud.
Marine plastic pollution is a major environmental issue. Given their ubiquitous nature and small dimensions, ingestion of microplastic (MP) and nanoplastic (NP) particles and their subsequent impact on marine life are a growing concern worldwide. Transfers along the trophic chain, including possible translocation, for which the hazards are less understood, are also a major preoccupation. Effects of MP ingestion have been studied on animals through laboratory exposure, showing impacts on feeding activity, reserve depletion and inflammatory responses, with consequences for fitness, notably reproduction. However, most experimental studies have used doses of manufactured virgin microspheres that may not be environmentally realistic. As for most...
Tipo: Text Palavras-chave: Microplastics; Nanoplastics; Experimental exposure; Impacts; Marine organisms; Physiology.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00449/56088/57621.pdf
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Contamination chimique du milieu marin : de la mesure à l'évaluation des risques ArchiMer
Abarnou, Alain.
This activity report entitled (“Chemical contamination of the marine environment: from measurement to risk assessment”) summarizes the main stages my career at Ifremer from November 1975 to june 2013. The first chapter deals with the seawater chlorination and chlorinated waters released into the sea, the identification and the conditions of the formation of various by-product of these processes. The second chapter concerns PCBs, their nature, their chemical analysis in environmental matrices. PCBs are considered as the best examples of persistant and bioaccumulable compounds and therefore, in all this report they are flagship contaminants to which other groups of studied substances are compared. The third chapter refers to studies performed within marine...
Tipo: Text Palavras-chave: Chlore; Chloration de l’eau de mer; Oxydant; Bromoforme; Impact environnemental; Mécanismes réactionnels; Désinfection; Polluants organiques persistants (POP); PCB; Dioxines; HAP; PBDE; Chlordécone; Baie de Seine; Organismes marins; Moules; Poissons; Surveillance environnementale; Analyse; Bioaccumulation; Chlorine; Seawater chlorination; Oxidizing agent; Bromoform; Environmental impact; Reaction mechanisms; Disinfection; Persitsent organic pollutants (POPs); PCBs; Dioxins; PAHs; PBDEs; Chlordecone (kepone); Baie de Seine; Marine organisms; Mussel; Fish; Environmental monitoring; Chemical analysis; Bioaccumulation.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00168/27946/26237.pdf
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Contribución al conocimiento de ciertos organismos marinos peligrosos en la costa ecuatoriana OceanDocs
Cruz, M..
En nuestras costas del Ecuador son frecuentes las "aguas malas" que son organismos transparentes, difíciles de verlos en el agua, que al estar en contacto con el bañista, descargan unos aguijones con veneno (Chematocistos), produciendo un ardor intenso a la persona; también hay gusanos marinos y caracoles, en nuestras playas que pueden ser causa de mucha molestia y en ciertos casos puede ser fatal, dependiendo de la sensibilidad de cada persona a los venenos o toxinas que inyectan. Otro organismos que se vuelve sumamente peligroso cuando son molestados son las culebras marinas las cuales siempre las encontramos varadas en las playas. De estos últimos cuatro grupos de organismos se tratará de orientar a la ciudadanía para que evite ciertos peligros y...
Tipo: Journal Contribution Palavras-chave: Marine organisms; Poisonous organisms.
Ano: 1986 URL: http://hdl.handle.net/1834/2114
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Contribución al conocimiento del género Voluta Linné, 1758 (Prosobranchia) en la costa del Caribe de Colombia OceanDocs
Cosel, R..
Se describe la distribución y la ecología de las 2 especies del gen. Voluta Linné, 1758, V. Virescens y V. Musica, V. Virescens se encuentra entre Wounta Haulover, Nicaragua, y Taganga, es habitante de fondo suave y vive en fango, arena fina y arena con cal coralina, desde agua seca hasta más o menos 90 Mts. de profundidad. V. Musica se halla en la parte este y sur del mar caribe, y en Colombia va hacia el oeste hasta la ensenada de Chengue. Vive en arena coralina y calcárea y parece que evita arena mineral y fango. Su distribución vertical es desde agua seca hasta 30-40 mts. de profundidad. Ambas especies viven completamente enterradas y se alimentan de gasterópodos y otros invertebrados, además de carroña. Se describe y figura la radula de V. virescens....
Tipo: Journal Contribution Palavras-chave: Marine molluscs; Marine organisms; Habitat.
Ano: 1976 URL: http://hdl.handle.net/1834/3287
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Determinación experimental del límite de detección, en el análisis de metales pesados en organismos marinos, por espectrofotometría de absorción atómica OceanDocs
Moreno, V.J.; Pérez, A..
The determination limit is defined as the minimum concentration of a substance in a sample that can be distinguished from the background with a given probability, using a particular analytical method. It is assumed that the concept of detention can be used satisfactorily to quality an analytical method. Some criteria which are necessary for intercalibration purpose are given in this paper. An algebraic method to calculate the detection limit easily and with minimum experimental work was developed. A method to determine the number of repetitions needed when the levels of the analyzed substance are near or under the detection limit of the method is also shown.
Tipo: Journal Contribution Palavras-chave: Heavy metals; Spectroscopic techniques; Marine organisms; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1984 URL: http://hdl.handle.net/1834/2051
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Estudio de la distribución y diversidad de los poliquetos bentónicos en las Islas Galápagos, Sept./Oct. de 1999 OceanDocs
Villamar, F..
Esta investigación tiene como propósito el de identificar las especies de los poliquetos bentónicos y conocer la actividad biológica de estos organismos marinos en las diferentes bahías y puertos en el área del Archipiélago de Galápagos, con la finalidad de determinar la composción, distribución y abundancia de cada uno de ellos y sus asociaciones existentes en la zona estudiada, durante el segundo Crucero de la Armada del Ecuador a bordo del B7I "ORION" entre septiembre y octubre de 1999.
Tipo: Journal Contribution Palavras-chave: Distribution; Marine organisms; Marine invertebrates; Benthos; Aquatic communities; Biodiversity; Composition; Abundance; Cruises; Oceanic islands; Benthos; Distribution; Aquatic communities.
Ano: 2000 URL: http://hdl.handle.net/1834/2269
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Fatty acids from lipids of marine organisms: Molecular biodiversity, roles as biomarkers, biologically active compounds, and economical aspects ArchiMer
Berge, Jean-pascal; Barnathan, Gilles.
Because of their characteristic living environments, marine organisms produce a variety of lipids. Fatty acids constitute the essential part of triglycerides and wax esters, which are the major components of fats and oils. Nevertheless, phospholipids and glycolipids have considerable importance and will be taken into account, especially the latter compounds that excite increasing interest regarding their promising biological activities. Thus, in addition to the major polyunsaturated fatty acids (PUFA) such as eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids, a great number of various fatty acids occur in marine organisms, e.g. saturated, mono- and diunsaturated, branched, halogenated, hydroxylated, methoxylated, non-methylene-interrupted. Various...
Tipo: Text Palavras-chave: Nutrition; Biomarkers; Marine organisms; Fatty acids; Lipids.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-937.pdf
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Macroalgas del golfo de Ana María, SE de Cuba OceanDocs
Suárez, A. M.; Martínez-Daranas, B.; Guimarais Bermejo, M.; Volta, R..
Se presenta por primera vez una lista de macroalgas marinas del golfo de Ana María, plataforma suroriental de Cuba. La recolecta dio como resultado 75 taxones, 24 de Rhodophyta, 14 Ochrophyta (Phaeophyceae) y 37 Chlorophyta. Todas las especies son típicas coralinos del Caribe.
Tipo: Journal Contribution Palavras-chave: Marine organisms; Species; Data collections; Check lists.
Ano: 2013 URL: http://hdl.handle.net/1834/5258
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Macrofauna bentónica en la zona intermareal y submareal en Caleta Aeolian, Isla Baltra (Galápagos, Ecuador) OceanDocs
Villamar, F.; Cruz, M..
Esta investigación tiene como propósito identificar y dar a conocer las especies de marco invertebrados bentónicos más comunes del área de la Caleta de Aeolian, Isla Baltra del Archipiélago de Galápagos, y conocer la actividad biológica de estos organismos marinos en la zona intermareal y submareal con la finalidad de determinar la composición, distribución y abundancia de cada uno de ellos y sus asociaciones existentes en la zona estudiada, como un marco referencial futuro que nos permita conocer los cambios para evaluar el impacto ambiental que puedan tener los hábitat de estos invertebrados marinos.
Tipo: Journal Contribution Palavras-chave: Microorganisms; Abundance; Marine organisms; Community composition; Distribution; Marine invertebrates; Benthos; Intertidal environment; Distribution; Benthos; Intertidal environment; Microorganisms; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_3923; Http://aims.fao.org/aos/agrovoc/c_4807.
Ano: 2007 URL: http://hdl.handle.net/1834/2405
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Modelación de escenarios de corrientes marinas en presencia de frentes fríos y su relación con la deriva de organismos en Playas del Este OceanDocs
Arriaza, L.; Rodas, L.; Lugioyo, M.; Loza, S..
Durante la incidencia de los frentes fríos de cualquier intensidad en toda la Ensenada de Sibarimar, el movimiento neto del agua sigue el contorno del litoral costero E-W. La circulación marina, además, mantiene fluctuaciones en la dirección perpendicular a la del movimiento medio. Las velocidades máximas de la corriente son altas entre 100-200 cm/s. En condiciones de régimen habitual, la traslación más rápida de los organismos, en dirección paralela a la costa, ocurre desde Guardafronteras hasta Calle 476-478, recorriendo 7 m en 2 min. Durante la acción de frentes fríos, ya sean débiles, moderados o intensos toda la costa será afectada por la deriva, ocurriendo la mayor recala de organismos hacia el W de la Ensenada de Sibarimar.
Tipo: Preprint Palavras-chave: Marine organisms.
Ano: 2010 URL: http://hdl.handle.net/1834/3568
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Nuevos registros de clorofitas marinas para Cuba OceanDocs
Moreira, A.; Fujii, M. T.; Suárez, A. M.; Wynne, M. J..
A partir de muestras colectadas en la bahía de Cienfuegos y de Santa Lucía (Pinar del Río), se identificaron dos nuevos registros de macroalgas marinas (clorofitas) para Cuba: Cladophora blomquistii C. Hoek y Udotea fibrosa D. S. Littler & M. M. Littler. C. blomquistii se registra por primera vez para la región del Caribe ya que se había consignado solo para lagunas costeras de la Florida, y la parte noreste del golfo de México. Se ofrecen además comentarios sobre la taxonomía, ecología y biogeografía de las mencionadas especies.
Tipo: Journal Contribution Palavras-chave: Marine organisms; New records; Taxonomy; Aquatic ecology.
Ano: 2013 URL: http://hdl.handle.net/1834/5255
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Nuevos registros de rodofitas marinas para Cuba OceanDocs
Moreira, A.; Fujii, M. T.; Suárez, A. M..
A partir de muestras colectadas en el litoral de la provincia de Cienfuegos se registraron cinco nuevos hallazgos de macroalgas marinas (rodofitas) para Cuba: Dasya ocellata (Gratel.) Harv. in Hook., Griffithsia schousboei Mont. in Webb var. anastomosans E.C. Oliveira, Gelidium torulosum Kützing, Halymenia pseudofloresii Collins & M. Howe y Champia vieillardii Kützing. Griffithsia schousboei var. anastomosans y Gelidium torulosum, que a su vez son nuevos registros para la región del Caribe, son dos taxa conocidos solo para Brasil. En el presente trabajo se ofrecen además comentarios sobre la taxonomía, ecología y biogeografía de las mencionadas especies. Destaca asimismo, la amplia variabilidad en tamaño y diámetro de las ramas de Halymenia...
Tipo: Journal Contribution Palavras-chave: Marine organisms; Taxonomy; Ecology; Biogeography.
Ano: 2013 URL: http://hdl.handle.net/1834/5257
Registros recuperados: 26
Primeira ... 12 ... Última
 

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