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Registros recuperados: 118
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A transposable element annotation pipeline and expression analysis reveal potentially active elements in the microalga Tisochrysis lutea ArchiMer
Berthelier, Jeremy; Casse, Nathalie; Daccord, Nicolas; Jamilloux, Veronique; Saint-jean, Bruno; Carrier, Gregory.
Background Transposable elements (TEs) are mobile DNA sequences known as drivers of genome evolution. Their impacts have been widely studied in animals, plants and insects, but little is known about them in microalgae. In a previous study, we compared the genetic polymorphisms between strains of the haptophyte microalga Tisochrysis lutea and suggested the involvement of active autonomous TEs in their genome evolution. Results To identify potentially autonomous TEs, we designed a pipeline named PiRATE (Pipeline to Retrieve and Annotate Transposable Elements, download: https://doi.org/10.17882/51795), and conducted an accurate TE annotation on a new genome assembly of T. lutea. PiRATE is composed of detection, classification and annotation steps. Its...
Tipo: Text Palavras-chave: Transposable elements; Genome assembly; Pipeline; Tool; Annotation; Algae; Haptophyte; Tisochrysis lutea.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00441/55250/56732.pdf
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Abattement de l'azote par le marais côtier de Kervigen et potentiel breton ArchiMer
Piriou, Jean-yves; Coic, Daniel; Merceron, Michel.
The coastal marsh of Kervigen is located near by the bay of Douarnenez and its 22 hectares are almost entirely covered by reeds. An experiment was there carried out to assess the nitrogen flux depletion of a small stream, the Kerharo. That one has a 45 km 2 mostly agricultural drainage basin. Due to its nitrate loadings to the next sandy beach, it feeds a green algae (Ulva) proliferation. In order to control its nitrogen fluxes, the stream was partly diverted through a part of the marsh (9 ha), before it was allowed to go back to the main bed. Thus a collapsible weir was set up during several springs and summers, i.e. the growing period of Ulva. The nitrate stripping off the going through flux is within a 30 to 90 % range,that is important (175 kg N03...
Tipo: Text Palavras-chave: Algae; Nitrogen; Ulva; Nitrate depletion; Costal marsh; Algue; Azote; Ulva; Abattement de nitrate; Marais côtier.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-64.pdf
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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
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Actividad antioxidante en extractos de algas marinas OceanDocs
Fernández, M.D.; Hernández, I.; Aneiros, A.; Tello, J..
Entre otras múltiples reacciones, los radicales libres pueden interactuar con ácidos grasos de las membranas celulares y causar la destrucción oxidativa de las mismas; a este proceso es al que se le denomina lipoperoxidación (Echeverry, 1998). Como defensas frente a las agresiones de los radicales libres se presentan una serie de sistemas enzimáticos entre los que destacan la superóxido dismutasa y la catalasa. En los organismos marinos se han encontrado compuestos con actividad antioxidantes fundamentalmente en algunas especies de algas. En este trabajo se realizó la evaluación del efecto antioxidante de los extractos de 6 algas mediante los métodos de inhibición de la peroxidación lipídica, determinación de la actividad mimética superóxido dismutasa...
Tipo: Other Palavras-chave: Antioxidants; Algae; Experimental research; Antioxidants; Algae; Http://aims.fao.org/aos/agrovoc/c_511; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2007 URL: http://hdl.handle.net/1834/2604
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Adaptations of lichens to conditions in tropical forests of South-East Asia and their taxonomic implications Naturalis
Wolseley, P.A.; Hawksworth, D.L..
Lichens are fungi with a specialized nutritional mode involving algae, or cyanobacteria, or both. Classification is based on the fungal partner, and around 13 500 species are known. The association is ancient, and the first ascomycete fungi with fruit bodies may have been lichenized. Adaptations to tropical habitats include extensive utilization of trentepohlioid algae, the production of large multi-celled spores capable of forming numerous germ tubes, and water-repellant hydophobins coating internal cell walls. Many tropical groups lack modern monographs and numerous new species are discovered in detailed studies. Lichens merit more attention in the tropics as bioindicators of habitat disturbance.
Tipo: Article / Letter to the editor Palavras-chave: Algae; Ascomycota; Bioindication; Coevolution; Symbiosis.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/525176
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Adiciones a las cloroficeas marinas del Caribe colombiano, I. OceanDocs
Bula-Meyer, G..
Once especies de algas verdes no citadas antes para el Caribe colombiano, se adicionan a la lista de las ya conocidas. Estas son: &iphonocladus fropicus (CROUAN) J. AGARDH, Anadyomene saldanbae JOL.Y et OLIVEIRA FILHO, Caulerpa webbiana(?) MONTAGNE, Bryobesia sp., Haltmeda goreaitii TAYLOR, H. copiosa GOREAU et GKAHAM, Avrainvillea nigricans DECAISNE, F. falva HOWE, A. ellioltii A. et E. S. GEPP, Vdotea cyathíjormh DECAISNE, Rbipiliopsis stri (EARLE et YOUNG) FARGHALY et DENIZOT y Polyphysa myriospora (JOLY et CORDEIRG-MARINO) BULA, comb. nov. Esta última y A. saldanhac son reportadas por primera vez para el Caribe. El hallazgo de R. atri en Colombia, constituye un tercer registro considerando que Rbipiliopsis reticulata (VAN DEN HOEK) FARG. et DEN.,...
Tipo: Journal Contribution Palavras-chave: Algae; Chlorophylls; Geographical distribution; Geographical distribution; Algae; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 1982 URL: http://hdl.handle.net/1834/3966
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Adiciones a las rhodophytas de Cuba OceanDocs
Solé, M. A.; Suárez, A. M..
En este trabajo se presentan 8 especies de Rhodophyta que representan adiciones de macroalgas marinas para la plataforma de Cuba. Los especímenes forman parte de la colección del Herbario MOBR. En el listado de especies se incluye para cada una de éstas, las referencias bibliográficas, diagnosis, una sinopsis de la información contenida en las etiquetas de los especímenes, se discuten y comparan los caracteres taxonómicos y se adicionan figuras de los especímenes.
Tipo: Journal Contribution Palavras-chave: New records; Algae.
Ano: 2010 URL: http://hdl.handle.net/1834/4611
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Ajustement de certains paramètres de culture par bouturage de Gracilaria verrucosa (algue rouge), Hudson papenfuss, dans le lac de Bizerte (Tunisie) OceanDocs
Ksouri, J.; Mensi, F.; Ben Said, R..
Cette étude, réalisée dans la partie Nord-Est du lac de Bizerte du premier Avril au 30 Juin 1999, porte sur l’étude de l’effet des deux paramètres, distance entre les touffes et poids initial des touffes, sur le rendement de culture par bouturage de Gracilaria verrucosa selon le mode des boudins de sable. Il en ressort que les conditions optimales de culture de cette espèce sont engendrées par un poids initial de 200 g, une distance entre les fragments de thalles de 30 cm et une récolte impérativement vers la fin du mois de Juin. Dans ces conditions, on enregistre un passage du poids de 200 g à 1087 g, un taux de croissance spécifique de 2,20 et une densité finale de 3,74 kg/m².
Tipo: Journal Contribution Palavras-chave: Marine sciences; Weight; Algae; Seaweed culture; Aquaculture techniques; Gracilaria verrucosa; Http://aims.fao.org/aos/agrovoc/c_49675.
Ano: 2000 URL: http://hdl.handle.net/1834/4287
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Algae and cyanobacteria on painted surfaces in Southern Brazil Rev. Microbiol.
Gaylarde,Peter M.; Gaylarde,Christine C..
Algae and cyanobacteria disfigure the external surfaces of buildings and may cause their physico-chemical deterioration. Even though the climate in Brazil is humid, there is no published literature on this problem. The objective of this work was to identify the major phototrophs present on Brazilian constructions in residential, urban and rural sites. The algal and cyanobacterial types present on discolored surfaces of painted buildings in nine different municipalities in Brazil, all lying between latitudes 19° South and 30° South, were examined. A total of 816 different organisms was detected in 58 sites. Approximately 63% were single-celled or colonial organisms. The cyanobacterial genus, Synechocystis, was the most biodiverse and frequently comprised...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Algae; Biodeterioration; Brazil; Cyanobacteria; Paint films.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300005
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ALGAL STUDIES IN BOLIVIA: A COMPILATION AND PRELIMINARY ANALYSIS OF EXISTING PHYCOLOGICAL LITERATURE Gayana Botánica
Morales,Eduardo A; Fernández,Erika; Fernandez,Carla E; Lizarro,Dennis; Alcoreza,Pamela.
A compilation of phycological literature published on Bolivian algae is presented together with an analysis of strengths, weaknesses, and needs in this field of investigation. An analysis of the nationality of authors, type, content, and geographic focus of the references shows that literature is largely produced by foreign scientist, concentrated on just a few areas of the country, or are biased toward particular algal groups, leaving ample room for more exploration. The Altiplano (high mountain plateau) and Amazon concentrate most of the publications, the phytoplankton and algae found in sediment cores, being the communities that have received more attention from scientists. Taxonomic references focus more on phytoplankton and tychoplankton communities...
Tipo: Journal article Palavras-chave: Bolivia; Phycology; Algae; Freshwater.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100009
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Algas marinas benticas indicadoras de un area afectada por aguas de surgencia frente a la Costa Caribe de Colombia OceanDocs
Bula-Meyer, G..
El presente articulo os el resultado de un estudio realizado para establecer la relación entre ciertos factores medioambien tales y la flora béntica del litoral Canbt de Colombia. Para propósito di! este estudio, esta franja costera ha sido dividida en dos Áreas. El Área 1 se encuentra entre Cabo Tiburón y la desembocadura del Rio Magdalena, estando caracterizada por aguas cálidas con muy pequeñas fluctuaciones de la temperatura del agua superficial. El Área 2 se extiende desde la desembocad tira del Rio Magdalena hasta Castilletes, y sus aguas se encuentran afectadas por una surgencía costera (Upwellmg), cuyo núcleo se localiza al oeste de la Península de la Guajira. Como resultado de este "upwelling" se presentan variaciones considerables en los...
Tipo: Journal Contribution Palavras-chave: Algae; Upwelling; Outcrops; Cold water masses; Algae; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 1977 URL: http://hdl.handle.net/1834/3897
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Análise da estrutura da comunidade de diatomáceas (Bacillariophyceae) em duas estações do sistema Guaíba, Rio Grande do Sul, Brasil Acta Botanica
Lobo,Eduardo A; Torgan,Lezilda Carvalho.
Através da análise da composição específica e da diversidade da comunidade de diatomáceas, em duas estações do sistema Guaíba (RS, Brasil), nos meses de setembro e novembro de 1975, foi encontrada uma diferença significativa na estrutura dessa comunidade. Essa diferença deve-se, provavelmente, à presença exclusiva de Achnanthes inflata (Kütz.) Grun. var. elata (Leud. - Fort.)Hust., A. lanceolata (Bréb.)Grun. var. lanceolata, Cocconeis placentula Ehr., Cyclotella meneghiniana Kütz., Cymbella minuta Hilse ex Rabh., Aulacosira distans (Ehr.) Sim., Navicula mutica Kütz., Surirella robusta Ehr. var. splendida (Ehr.) Van Heurck, Synedra ulna (Nitz.)Ehr., espécies abundantes, que refletem características ambientais distintas, pelo fato de apresentarem uma...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Algae; Bacillariophyceae; Structure of community.
Ano: 1987 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061987000300011
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Analysis of larval oyster grazing by flow cytometry ArchiMer
Chretiennot-dinet, Marie-josèphe; Vaulot, Daniel; Galois, Robert; Spano, Anna-maria; Robert, Rene.
The ingestion of 8 algal species by oyster larvae (Crassostrea gigas Thunberg, 1793) was measured by flow cytometry (FCM). In a preliminary experiment, cell size (estimated by light scatter) and chlorophyll fluorescence of 30 algal species were evaluated to select those species which could be mixed together and still be easily discriminated by FCM. Grazing experiments were carried out over 48 h with 6 and 15-day old larvae fed on 3 algal mixtures, each containing 3 different algal species. The concentration of each species was estimated at 0, 6, 12, 24 and 48 h by FCM. Grazing pressure on a given algal species was dependent upon the age of the larvae, the time of the day and the composition of the mixture. Grazing rates of older larvae were about twice...
Tipo: Text Palavras-chave: Oyster larvae; Crassostrea gigas; Grazing; Algae; Selective feeding; Flow cytometry.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00090/20164/17817.pdf
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Annotated list of new records of marine macroalgae for Kenya and Tanzania, since Isaac's and Jaasund's publications OMA
Coppejans, E.; Leliaert, F.; De Clerck, O..
48 species of Rhodophyta, 10 species of Phaeophyta and 38 species of Chlorophyta, newly reported since Isaac's publications on seaweeds from Kenya and Jaasund's papers on macroalgae fiom Tanzania, are listed with bibliograpbic, taxonomic and biogeographic comments. Some of these species were previously published in more detailed taxonomic studies by this paper's authors.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Algae; New records; Kenya; Tanzania.
Ano: 2000 URL: http://www.vliz.be/imisdocs/publications/242248.pdf
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Application of an Ocean Color Algal Taxa Detection Model to Red Tides in the Southern Benguela OceanDocs
Etheridge, S.M.; Roesler, C.S.; Pitcher, G.C..
A forward reflectance model is used to demonstrate the sensitivity of hyperspectral ocean color observations to phytoplankton biomass, species composition and cell size. An inverse ocean color model is developed which has explicit terms for 5 taxonomic groups of phytoplankton. The model expresses the contributions of each group in terms of the magnitude of the absorption coefficient, which is proportional to biomass. The model is applied to a time series of reflectance data from an expansive red tide off the west coast of South Africa. The results compare favorably with those derived from microscopic cell counts. This demonstrates the utility of in situ ocean color detection of the composition and concentration of potentially harmful algae.
Tipo: Report Palavras-chave: Algae; Plankton studies; Phytoplankton; Colorimetric techniques.
Ano: 2000 URL: http://hdl.handle.net/1834/826
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Bases biológicas de Ulva fasciata Delile, (Chlorophyta) para su posible explotación al Oeste de La Habana, Cuba OceanDocs
Cano Mallo, M..
El objetivo de esta tesis es caracterizar las poblaciones naturales de Ulva fasciata en el sector comprendido entre los ríos Quibú y Jaimanitas al oeste de La Habana, típico de costas de emersión del Caribe Occidental, con vistas a su posible explotación. El estudio se realizó entre marzo de 1996 y enero del 2001. Los resultados más importantes permitieron comprobar que la especie U. fasciata no se distribuye de forma similar en todo este sector, en la cobertura algal intervienen de manera decisiva, el tipo de sustrato y la disponibilidad de nutrientes en el medio. Los compuestos del nitrógeno y el fósforo en el agua de mar y las diferencias en la amplitud de variación de los mismos, justifican las diferencias en la morfometría, la biomasa en pie y el...
Tipo: Theses and Dissertations Palavras-chave: Algae; Biology; Algae; Biology; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_925.
Ano: 2008 URL: http://hdl.handle.net/1834/3404
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Beitrag zur Kenntnis der Algenflora an der kolumbianischen Küste der Karibischen See OceanDocs
Schnetter, R..
Como complemento de los dos estudios ya publicados, se informa sobre nuevos resultados de la investigación de la flora algológica en las costas colombianas del Mar Caribe. De las especies mencionadas, 73 no habían sido anteriormente descritas, como vivientes en las citadas costas.
Tipo: Journal Contribution Palavras-chave: Algae; Algae; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 1969 URL: http://hdl.handle.net/1834/3325
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Benthic communities and geomorphology of the Tesoro Island Coral Reef, Colombian Caribbean OceanDocs
Sánchez-M., Juan M..
The benthic communities distribution in Tesoro Island (Colombian Caribbean) coral reef was determinad by cartography of reef morphology and functional groups from aerial photographs, theodolite triangulation, and bottom transects over depths ranging from O to 30 m. Tesoro Island is a sand cay reef developed over an emerged reef platform whose basal cone possibly originated by mud diapirism on the continental shelf. The benthic communities are distributed as subzones of the geomorphologic units. The reef crest lies along the breaker zone, formed by Millepora spp. buttresses covered on their tops by Palythoa spp. and seawardly by a turf of Dictyota spp. The rear reef (varying from 0.5-1.5 m ¡n depth) is composed of pavement and grooves with live Porites...
Tipo: Journal Contribution Palavras-chave: Ecology; Benthos; Outer continental shelf; Coral; Algae; Surf; Cartography; Condition factor; Aerial photography; Geomorphology; Coral reefs; Ecology; Benthos; Aerial photography; Coral reefs; Algae; Cartography; Geomorphology; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_8634; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_1344; Http://aims.fao.org/aos/agrovoc/c_3233.
Ano: 1995 URL: http://hdl.handle.net/1834/3803
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Biodiésel a partir de algas, ¿el combustible ideal para la Antártica? OceanDocs
Cid, P..
Durante la campaña antártica 2008 de la Universidad de Magallanes, el equipo liderado por el autor efectuó una evaluación de las necesidades energéticas de la base Bernardo O’Higgins (63º19’15” S, 57º53’55” O) y realizó exploraciones en los alrededores con el objetivo de identificar materias primas adecuadas para la elaboración in situ del combustible verde. En esta oportunidad, se encontraron algunas variedades de algas y microalgas que fueron consideradas con buen potencial para la producción de biodiésel.
Tipo: Journal Contribution Palavras-chave: Algae; Fuels; Fuels; Algae; Http://aims.fao.org/aos/agrovoc/c_3136; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2008 URL: http://hdl.handle.net/1834/3373
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Biomass distribution and physiological capabilities of bacteria in the water column above a sea grass system. ArchiMer
Velimirov, B; Herndl, G; Kavka, G.
The distribution pattern of bacteria in the water column above and within a Posidonia oceanica bed near Ischia (off the Gulf of Naples) was investigated and correlated with DOC and POM data for autumn and winter. Data from samples of 5 stations along a transect from shallow to deep showed rather low bacterial densities (10 super(4).ml super(-1)) for both seasons. The number of attached bacteria was higher in late winter as compared to autumn when the leaves are shed from the stands. Except for occasional peaks DOC ranged between 1.5 and 4.5 mg C/1 while POM concentrations ranged form 4 to 14 mg AFDW.1 super(-1). Hydrolytic capabilities of isolated bacterial colonies showed that more carbohydrate substrates could be fermented in winter as compared to...
Tipo: Text Palavras-chave: Posidonia oceanica; Microorganisms; Physiology; Seasonal distribution; Algae; Bacteria; Particulate organic matter; Metabolism; Water column; Fermentation; Sea grass.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-954.pdf
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