Consulta: subjectFacets:"Protozoaires"
Registros recuperados: 2
Data/hora: 01/06/2024 01:06:53

Etude des recentes epizooties de l'huitre plate Ostrea Edulis Linne et de leur impact sur l'ostreiculture bretonne
Provedor de dados: 5
Autores: Grizel, Henri.
The study concerns two previously unseen Protozoa, Marteilia refringens and Bonamia ostreae, responsible for epizootics in the flat oyster, Ostrea edulis L. The epizootiological aspect, the impact of diseases on Breton oyster farming and the research for appropriate prophylaxes is addressed. The morphology, the ultrastructure and certain phases of the growth cycle are described for the two parasites, as well as their cyto- and histopathogenic effects. The epizootiology explains the evolution of the diseases in space and time, their conditions for propagating, the sensitivity of the parasites and the receptivity of various test hosts. A summary analysis of Breton oyster farming before and during the epizootic is done. It makes it possible to judge the...
Tipo: Text
Palavras-chave: Impact; Prophylaxies; Epizootiologie; Bonamia ostreae; Martelia refrengens; Protozoaires; Epizooties; Ostrea edulis; Huître plate; Ostréiculture; Bretagne.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/these-2581.pdf

Release of dissolved amino acids by flagellates and ciliates grazing on bacteria
Provedor de dados: 5
Autores: Ferrier-pages, C; Karner, M; Rassoulzadegan, F.
Release of amino acids was examined in the laboratory in the form of dissolved primary amine (DPA) by two marine planktonic protozoa (the oligotrichous ciliate, Strombidium sulcatum and the aplastidic flagellate Pseudobodo sp.) grazing on bacteria. DPA release rates were high (19-25 x 10(-6) and 1.8-2.3 x 10(-6) mu mol DPA cell(-1) h(-1) for flagellates and ciliates, respectively) during the exponential phase, when the ingestion rates were maximum. Release rates were lower during the other growth phases. The release of DPA accounted for 10 % (flagellates) and 16 % (ciliates) of the total nitrogen ingested. Our data suggest that the release of DPA by protozoa could play an important role in supporting bacterial and consequently autotrophic pico- and...
Tipo: Text
Palavras-chave: Acides aminés; Protozoaires; Taux d'excrétion; Matière organique dissoute; Amino acids; Protozoa; Excretion rates; Dissolved organic matter.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43670/43200.pdf