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| Registros recuperados: 26 | |
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| Heydarizadeh, Parisa; Veidi, Brigitte; Huang, Bing; Lukomska, Ewa; Wielgosz-collin, Gaetane; Couzinet-mossion, Aurélie; Bougaran, Gael; Marchand, Justine; Schoefs, Benoit. |
| Diatoms adapt to changing environmental conditions in very efficient ways. Among the mechanisms that can be activated, the reorientation of carbon metabolism is crucial because it allows the storage of energy into energy-dense molecules, typically lipids. Beside their roles in physiology, lipids are commercially interesting compounds. Therefore studies dealing with this topic are relevant for both basic and applied science. Although the molecular mechanisms involved in the reorientation of carbon metabolism as a response to a deficiency in nutrients such as nitrogen or phosphorus has been partially elucidated, the impacts of carbon availability on the implementation of the reorientation mechanisms remain unclear. Indeed, it has not been determined if the... |
| Tipo: Text |
Palavras-chave: Diatom; Carbon deficiency; Carbon metabolism; Stress; Light intensity; Regulation; Biotechnology; Phosphoenolpyruvate. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00489/60058/63338.pdf |
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| Labry, Claire; Delmas, Daniel; Moriceau, Brivaela; Gallinari, Morgane; Quere, Julien; Youenou, Agnes. |
| Phosphorus (P) limitation of phytoplankton growth is known to affect the accumulation and release of carbohydrates (CHO) by micro-algae. However, relatively little is known about the fate of algal exudates, notably their bacterial degradation. The CHO chemical characterization is also not exhaustive, especially in ‘functional’ pools relevant for phytoplankton physiology (particulate reserve [R] or structural [S] CHO) and for bacterial degradation (dissolved mono- [MDCHO] and polysaccharides [P-DCHO]). In this study, we investigated how P depletion and repletion affect the CHO composition in diatom Thalassiosira weissflogii cultures, and the shortterm response of free and diatom-attached bacteria in terms of abundance and potential βglucosidase activity... |
| Tipo: Text |
Palavras-chave: P limitation; Phytoplankton; Diatom; Bacteria; Mineralization; Carbohydrate; Glucosidase. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00628/74045/73532.pdf |
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| Soppa, Mariana A.; Hirata, Takafumi; Silva, Brenner; Dinter, Tilman; Peeken, Ilka; Wiegmann, Sonja; Bracher, Astrid. |
| Diatoms are the major marine primary producers on the global scale and, recently, several methods have been developed to retrieve their abundance or dominance from satellite remote sensing data. In this work, we highlight the importance of the Southern Ocean (SO) in developing a global algorithm for diatom using an Abundance Based Approach (ABA). A large global in situ data set of phytoplankton pigments was compiled, particularly with more samples collected in the SO. We revised the ABA to take account of the information on the penetration depth (Z(pd)) and to improve the relationship between diatoms and total chlorophyll-a (TChla). The results showed that there is a distinct relationship between diatoms and TChla in the SO, and a new global model... |
| Tipo: Text |
Palavras-chave: Ocean colour; Phytoplankton functional types; Diatom; Remote sensing; Chlorophyll-a. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40075/39289.pdf |
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| Gagneux Moreaux, Sindy; Cosson, Richard P.; Bustamante, Paco; Moreau, Christophe. |
| The Bay of Bourgneuf, France, is a main site of shellfish production. In the marshes along the bay, oyster intensive rearing and fattening need the mass production of microalgae. Salt groundwaters, available in this region, support a large part of this production for aquaculture. Studies carried out by local authorities have brought to the fore the accumulation of lead (Pb) in several samples of algal pastes derived from cultures using salt groundwater. The aim of this study was to compare growth, nutritional value and metal (Cd, Cu, Pb and Zn) uptake of four microalgae grown in two salt groundwaters or in enriched coastal seawater. Cultures of microalgae used in aquaculture (Haslea ostrearia, Phaeodactylum tricornutum, Skeletonema costatum and Tetraselmis... |
| Tipo: Text |
Palavras-chave: Marine microalgae cultivation; Aquaculture; Metals; Growth; Prasinophycea; Bacillariophycea; Diatom; Bioaccumulation; Trace elements; Saline groundwater. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2135.pdf |
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| Falaise, Charlotte; Cormier, Patrick; Tremblay, Réjean; Audet, Céline; Deschênes, Jean-sébastien; Turcotte, François; François, Cyrille; Seger, Andreas; Hallegraeff, Gustaaf; Lindquist, Niels; Sirjacobs, Damien; Gobert, Sylvie; Lejeune, Pierre; Demoulin, Vincent; Mouget, Jean-luc. |
| Marennine is a water-soluble blue-green pigment produced by the marine diatom Haslea ostrearia. The diatom and its pigment are well known from oyster farming areas as the source of the greening of oyster gills, a natural process increasing their market value in Western France. Blooms of blue Haslea are also present outside oyster ponds and hence marine organisms can be exposed, periodically and locally, to significant amounts of marennine in natural environments. Due to its demonstrated antibacterial activities against marine pathogenic bacteria (e.g. Vibrio) and possible prophylactic effects toward bivalve larvae, marennine is of special interest for the aquaculture industry, especially bivalve hatcheries. The present study aimed to provide new insights... |
| Tipo: Text |
Palavras-chave: Diatom; Haslea ostrearia; Marennine; Marine organisms; Natural bioactive compound. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00477/58887/61443.pdf |
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| Minguez, Laetitia; Bureau, Ronan; Halm-lemeille, Marie-pierre. |
| Antidepressants are among the most prescribed pharmaceuticals throughout the world. Their presence has already been detected in several aquatic ecosystems worldwide and their effects on non-target organisms justify the growing concern of both the public and regulatory authorities. These emerging pollutants do not occur as isolated compounds but rather as multi-component mixtures, which may lead to increased adverse effects compared to individual compounds. Freshwater and marine algae seem particularly sensitive to pharmaceuticals, including antidepressants. Studies assessing the toxicity of antidepressant mixture to algae focused mainly on binary mixtures of selective serotonin reuptake inhibitors. In the present experiment, the freshwater algae... |
| Tipo: Text |
Palavras-chave: Green algae; Diatom; Mixture; Pharmaceutical; QSAR. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00423/53429/54315.pdf |
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| Zhang, Xiaosen; Reed, Jane; Wagner, Bernd; Francke, Alexander; Levkov, Zlatko. |
| The juncture between the west-east and north-south contrasting Holocene climatic domains across the Mediterranean is complex and poorly understood. Diatom analysis of Lake Dojran (Republic of Macedonia/Greece) provides a new insight into lake levels and trophic status during the Lateglacial and Holocene periods in the northeastern Mediterranean. Following a very shallow or even desiccated state at the core base at ca. 12,500 cal yr BP, indicated by sedimentological and hydro-acoustic data, diatoms indicate lake infilling, from a shallow state with abundant benthos to a plankton-dominated relatively high lake level and eutrophic state thereafter. Diatom-inferred shallowing between ca. 12,400-12,000 cal yr BP and a very low lake level and eutrophic,... |
| Tipo: Text |
Palavras-chave: Palaeoclimate; Diatom; Lake Dojran; Mediterranean; Balkans; Younger Dryas; Holocene. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40062/39293.pdf |
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| Registros recuperados: 26 | |
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