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| Registros recuperados: 24 | |
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| Lassus, Patrick; Le Dean, Loic. |
| Le traitement des effluents urbains au chlorure ferrique à la station de Toulon produit au rejet des teneurs en fer excédant largement les valeurs moyennes en eau de mer. Une incidence potentielle sur le phytoplancton d'eau rouge a été envisagée, et en particulier sur Prorocentrum minimum, espèce dont les blooms sont de plus en plus fréquents sur le littoral méditerranéen. Des sels ferreux et ferriques à degré de solubilité variable en eau de mer ont été testés sur la croissance de cet organisme. Toutes les formes expérimentées améliorent considérablement la croissance par rapport à une eau de mer carencée en fer, en particulier le citrate ferrique. L'espèce étudiée semble pouvoir être considérée comme "0pportuniste" compte tenu de sa capacité à utiliser... |
| Tipo: Text |
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| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/00132/24330/22329.pdf |
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| Marcaillou-le Baut, Claire; Bardin, B.; Bardouil, Michele; Bohec, Madeleine; Le Dean, Loic; Masselin, Pierre; Truquet, Philippe. |
| Two studies of depuration, one in laboratory conditions and the other one in an oyster's pond were performed using 2 sets of contaminated mussels with diarrhetic toxins at a high and a low level (3 and 1 M.U.). Depuration kinetics were followed both by the adult mouse test and okadaïc acid analysis. Results are - in the pond, high toxic mussels need about 20 days to become eatable (toxicity level : 0.5 M.U.g-1 digestive glands), -this time decreases when the initial toxicity is low but it increases when mussels are underfed, - a good correlation is observed between the total toxicity and okadaïc acid concentration. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00075/18595/16148.pdf |
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| Bougaran, Gael; Le Dean, Loic; Loizel, Céline; Lukomska, Ewa; Picquet, Marie-lise; Kaas, Raymond; Muller-feuga, Arnaud. |
| La prymnésiophycée Isochrysis galbana affinis Tahiti (T -iso) est classiquement utilisée comme nourriture de larves de mollusques et de proies vivantes de poissons d'aquaculture dans la plupart des écloseries produisant des juvéniles de ces espèces. La solution d'enrichissement de Conway (SEC), élaborée en 1966 par Walne, est largement utilisée pour la production de T -iso en batch. Cependant, les apports nutritifs de cette solution d'enrichissement ne sont pas spécifiquement optimisés pour la culture de cette algue, participant à engendrer des coûts de production élevés (Valenzuala-Espinoza et al., 1999 ; Fabregas et al., 1986) et des effluents inépuisés. Dans les 15 dernières années, plusieurs auteurs sont parvenus à réduire le coût de solutions... |
| Tipo: Text |
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| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00304/41519/40727.pdf |
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| Burgeot, Thierry; Bocquene, Gilles; Truquet, Philippe; Le Dean, Loic; Poulard, Jean-charles; Dorel, Didier; Souplet, Arnauld; Galgani, Francois. |
| An oceanographic cruise in 1991 along the English Channel and Atlantic coasts of France indicated the value of dragonet Callionymus lyra Linnaeus, 1758 as a target species for monitoring biological effects. Ethoxyresorufin-O-deethylase measurements in this species provided a first assessment of the effects of hydrocarbons (PCB, PAH, dioxins) on the marine environment. The specific behavior of dragonet was defined by biochemical characterization. Biological data were obtained during 3 additional oceanographic cruises to study changes in the abundance and distribution of the species in the English Channel and the Bay of Biscay. This first assessment, carried out in the context of the National Observation Network, indicated that pollutants do not have... |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00091/20243/17895.pdf |
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| Angeri, S.; Bougaran, Gael; Connan, Jean-paul; Jouin, Jean-claude; Kaas, Raymond; Le Dean, Loic; Legrand, J.; Loubiere, K.; Lukomska, Ewa; Olivo, Erell; Picquet, Marie-lise; Pruvost, J.; Robert, Rene. |
| Les travaux présentés dans le cadre de ce rapport d'activité rendent compte des avancées réalisées sur le plan (1) biologique, avec d'une part une étude sur le comportement du genre Chaetoceros en culture continue et, d'autre part, les résultats d'expérimentations sur les performances d'élevages larvaires réalisés sur la base de cultures de microalgues en continu, et (2) technologique, avec la continuité des actions de développement du photobioréacteur destiné aux écloseries commerciales ainsi que des périphériques indispensables à son intégration dans le secteur aquacole. |
| Tipo: Text |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00304/41518/40726.pdf |
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| Lassus, Patrick; Le Dean, Loic; Bocquene, Gilles; Bardouil, Michele; Truquet, Philippe; Truquet, Isabelle; Larrazabal, M.e.. |
| During EIGAS échointegration cruise, hydrological and phytoplanktonic sampling operations have been carried out along off shore and coastal South Brittany area, from June 8 th to 20 - 1986. Dinophysis cells densities have been evaluated at 3 depths and for 32 statlons between Penmarc'h and Belle Ile, and positive correlation with water stability index have been pointed out; high cells densities area have been detected in the South of Loire estuary |
| Tipo: Text |
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| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00119/23000/20830.pdf |
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| Bougaran, Gael; Le Dean, Loic; Lukomska, Ewa; Picquet, Marie-lise; Kaas, Raymond; Muller-feuga, Arnaud. |
| La prymnésiophycée Isochrysis galbana affinis Tahiti (T -iso) est une micro algue marine classiquement utilisée comme nourriture de larves de mollusques et de proies vivantes de poissons d'aquaculture dans la plupart des écloseries produisant des juvéniles de ces espèces. Aujourd'hui, de nombreuses écloseries de mollusques et de poissons l'utilisent en association avec d'autres espèces telles que Pavlova lutheri, Chaetoceros calcitrans et Skeletonema costatum. Isolée à Tahiti par JL Martin en 1975 (comm. pers.), cette algue s'est rapidement imposée dans la nutrition larvaire des crevettes et des mollusques en raison de sa croissance rapide en conditions tropicales et de ses qualités nutritionnelles, en relation avec sa forte teneur en acides gras... |
| Tipo: Text |
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| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00304/41508/40716.pdf |
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| Le Dean, Loic; Gauthier, Franck. |
| Nous avons réalisé cette étude dans le but de fournir aux agents d'IFREMER chargés de la surveillance des eaux littorales et en particulier de la flore phytoplanctonnique, un outil permettant d'identifier et de compter les cellules de Dinophysis de façon automatique. La visionique nous semblant être une discipline qui se prêtait à ce type de détection, nous avons réalisé une étude de faisabilité d'un système d'analyse d'il}1age appliqué à la reconnaissance et au comptage de Dinophysis. Le capteur utilisé est une caméra J.V.C Tri C.C.D transmettant trois images (rouge - verte - bleue) à un ordinateur compatible A.T.. Celui ci est équipé d'un ensemble de cartes MATROX de numérisation et traitement d'images et d'un coprossesseur arithmétique. Les applications... |
| Tipo: Text |
Palavras-chave: Dinophysis; Phytoplancton; Visionique; Reconnaissance de forme; Segmentation; Binarisationcontours. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00136/24714/22768.pdf |
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| Coulombier, Noemie; Chim, Liet; Le Dean, Loic; Morezzi, Nicola; Brun, Pierre; Malo, Florent; Nakagawa, Kento; Ducrocq, Manuel; Rivaton, Adrien; Colin, Fabrice. |
| AMICAL is a partnership program of research and innovation between ADECAL TECHNOPOLE (New Caledonia innovation and technology park) and IFREMER to initiate the development of a microalgae industry in New Caledonia, based on selected local strains. This French oversea territory, located in south Pacific, features many competitive advantages for the development of a blue economy industry (climate, biodiversity hotspot, well developed aquaculture sector...). The project relies on two laboratories (Figure 1) owned and managed by ADECAL TECHNOPOLE with the scientific support of IFREMER: • the Laboratory for MicroAlgae study (LEMA), whose scientific direction is provided by the laboratory of Physiology and Biotechnology of Algae (PBA, IFREMER, Nantes),... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00358/46897/46783.pdf |
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| Bougaran, Gael; Le Dean, Loic; Lukomska, Ewa; Kaas, Raymond; Baron, Regis. |
| Starting microalgae continuous culture generally includes a preliminary batch culture to obtain sufficient cell density. It is possible to apply continuous regime from the beginning of the culture (IC mode) rather than to begin by an initial batch (IB mode). It is our purpose to check that both initial modes lead to identical steady-state cell characteristics. The microalga Isochrysis galbana affinis Tahiti was used for this comparative study. With an initial cell density of 5 x 10(5) cell ml(-1) and a dilution rate of about 1.0 d(-1), both IB and IC modes led to identical cell density once steady-state is reached between 6 and 8 d after inoculation in the two cases. Cell concentration of chlorophyll a and pheopigment a were found to be similar for IB and... |
| Tipo: Text |
Palavras-chave: Isochrysis; Cell quota; Photosynthesis; Steady state; Continuous culture. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-597.pdf |
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| Marchetti, Julie; Bougaran, Gael; Le Dean, Loic; Megrier, Cyril; Lukomska, Ewa; Kaas, Raymond; Olivo, Erell; Baron, Regis; Robert, Rene; Cadoret, Jean-paul. |
| Optimal culture conditions were investigated for the continuous culture of Isochrysis affinis galbana (T-Iso) by assessing the effects of irradiance, temperature, pH and nitrogen and phosphorus requirements. Assessment of the growth rate-irradiance relationship in a turbidostat experiment highlighted that an optimum irradiance efficiency for growth (E-mu) occurred at irradiance much lower than the saturating level. Furthermore, our modeling approach for productivity pointed out that an optimal set of irradiance and dilution rate could be achieved in order to maximize irradiance efficiency. Optimal conditions for growth were assessed for temperature, pH and irradiance by means of a factorial design experiment. The resulting model predicted that optimal... |
| Tipo: Text |
Palavras-chave: Isochrysis affinis galbana; Irradiance efficiency; Factor interaction; Nutrient limitation; Microalgae cultures. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00076/18736/16465.pdf |
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| Lassus, Patrick; Truquet, Philippe; Le Dean, Loic; Bardouil, Michele; Truquet, Isabelle. |
| As a part of hydrological sampLing operation in South Brittany, 8 transects for 26 sampling stations were made in order to determine horizontal, and vertical distribution of Dinophysis sacculus in the 10 m layer. Un like to 1986, results do not show any correlations between Dinophysis concentrations and stability index. That may, nevertheless, be due to lower cells densities in 1987 when compared to 1986. A thermal, gradient, lower than in 1986, is still observable in the Bouthern of Loire Mouth. And, as a last point, when chlorophyll a concentrations are higher in - 10 m layer than in surface layer (Audierne and Noirmoutier areas), it can be observed hight densities of an other toxie Dinoflagellate : Gyrodinium aureolum . |
| Tipo: Text |
Palavras-chave: Bretagne sud; Hydrologie; D. sacculus; G. aureolum; South Brittany; Hydrology; D. sacculus; G. aureolum. |
| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/00138/24921/23015.pdf |
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| Robert, Rene; Chretiennot-dinet, Marie-josèphe; Kaas, Raymond; Martin-jezequel, Véronique; Moal, Jeanne; Le Coz, Jean-rene; Nicolas, Jean-louis; Bernard, Eudes; Connan, Jean-paul; Le Dean, Loic; Le Gourrierec, Gaetane; Leroy, Bertrand; Quere, Claudie. |
| in mollusc hatcheries. Consequently, we assessed themost commonly used species to establish their growth and size profiles, their cytomorphological, biochemical, biomolecular identification as well as their cytometer signs, and also their ability to grow under extreme conditions of temperature and salinity. This work aimed at matching the conformity of the strains used in Argenton (dispatched to most of the French commercial hatcheries) to those of a referenced culture collection. A previous screening preceded this study, because of the 45 species and/or clones held originally, Argenton kept no more than 15 species. As most of the latter are also represented in referenced collection, our strains are therefore correctly identified. On the other hand, the... |
| Tipo: Text |
Palavras-chave: Ecological limits; Biomolecular profile; Flow cytometry; Biochemical composition; Cytomorphology; Phytoplankton; Mollusc; Hatchery; Ecotolérance; Profil biomoléculaire; Cytométrie en flux; Composition biochimique; Cytomorphologie; Phytoplancton; Mollusques; Ecloserie. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/rapport-1546.pdf |
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| Registros recuperados: 24 | |
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