Abstract
Monallantus salina Bourrelly has been taken from the Gulf of Marseille (Mediterranean Sea) and placed in a bacteria-free culture. The effects of aging were followed using several methods of growth survey. Chlorophyll a content was found to be a good criterion for potential carbon production, although exact measurements of carbon uptake were obtained by the 14C method. A.T.P., active proteins and amino acids estimates are the best indicators of metabolic cell activity. A good estimate of the standing crop is obtained from dry weight, carbon, nitrogen and carbohydrate contents. A low portion of the total organic nitrogen content, ranging from 1.9 to 6.4%, has been recorded in the culture medium; citrulline appears to be the most important of the amino acids emitted; it constitutes 2/3 of the total content at the end of the logarithmic bloom. M. salina appears to be valuable material for laboratory experiments, and may prove useful for the nutrition of various marine larvae in aquaculture experiments.
Résumé
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1.
Le comportement de Monallantus salina, Bourrelly (xanthophycée) en culture a été étudie. L'utilisation de différents paramètres a permis de suivre l'évolution du métabolisme en fonction du vieillissement.
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2.
Outre la mesure de l'assimilation en C, la teneur en chlorophylle a s'avère être, chez M. salina, un bon critère d'estimation du potentiel d'assimilation photosynthétique.
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3.
A.T.P. et protéines réactives sont les meilleurs indicateurs de la fraction active de la biomasse.
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4.
Le vieillissement des cellules s'accompagne d'une augmentation de la teneur en sucres, et d'un accroissement des rapports carbone/azote et sucres/protéines.
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5.
L'azote libéré dans le milieu représente 1,9 à 6,4% de l'azote particulaire; la citrulline constitue les 2/3 des acides aminés émis pendant la phase exponentielle.
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6.
M. salina serait un matériel favorable aux expérimentations de laboratoire, et pourrait convenir pour la nutrition de larves en élevage.
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Communicated by J. M. Peres, Marseille
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Berland, B.R., Bonin, D.J., Daumas, R.A. et al. Variations du comportement physiologique de l'algue Monallantus salina (xanthophycée) en culture. Marine Biology 7, 82–92 (1970). https://doi.org/10.1007/BF00346811
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DOI: https://doi.org/10.1007/BF00346811