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163 results on '"Sauze, N."'

4. Performance Evaluation of Circuit Emulation Service in a Metropolitan Optical Ring Architecture

Author

Nguyen, V. H., Mamoun, M. Ben, Atmaca, T., Popa, D., Le Sauze, N., Ciavaglia, L., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, de Souza, José Neuman, editor, Dini, Petre, editor, and Lorenz, Pascal, editor

Published
2004
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19. The effects of ionotropic agonists of excitatory amino acids on the release of arginine vasopressin in rat hypothalamic slices

Author

Joanny, P., Steinberg, J., Guerrero, F., Sauze, N., Oliver, C., Grino, M., and Guerrero, François

Subjects
nervous system, [SDV.MHEP.PHY] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO]
Abstract

The effects of ionotropic excitatory amino acids agonists on the release of vasopressin from rat hypothalamic slices were studied. Incubation with increasing doses of NMDA, kainate or AMPA decreased the release of vasopressin in a dose-dependent manner. The values of the IC50 were 1.0, 9.6, or 3.7 x 10-8 M, respectively. The inhibitory effect of the various excitatory amino acids tested was blocked by coincubation with their respective antagonists. Vasopressin secretion was stimulated to 140.3 +/- 7.6% of controls when the slices were obtained from chronically (7 days) salt-loaded rats. Addition of 1 x 10-7 M NMDA or 1 x 10-6 M kainate to the incubation medium antagonized the salt loading-induced increase in vasopressin release. Incubation with 1 x 10-4 M tetrodotoxin did not change basal vasopressin release, but it blocked the decrease in vasopressin secretion induced by 1 x 10-7 M NMDA or 1 x 10-6 M kainate or 1 x 10-6 M AMPA. Incubation with 1 x 10-5 M phaclophen (a GABAB antagonist) and 1 x 10-5 M bicuculline (a GABAA antagonist) was without effect on basal vasopressin secretion while it reversed the inhibition of vasopressin release induced by 1 x 10-7 M NMDA. Incubation with 1 x 10-6 M GABA alone decreased vasopressin secretion to 64.6 +/- 6.9% of control values. The inhibitory effect of GABA did not change when 1 x 10-7 M NMDA was added to the incubation medium. These findings demonstrate that ionotropic excitatory amino acids agonists inhibit vasopressin secretion from hypothalamic slices. They strongly suggest that this inhibitory effect is mediated through local GABAergic interneurones.

Published
2000

21. The European IST Project DAVID: A Viable Approach Toward Optical Packet Switching

Author

Dittmann, Lars, Develder, C., Chioaroni, D., Neri, F., Callegati, F., Koerber, W., Stavdas, A., Renaud, M, Rafel, A., Sole-Pareta, J., Cerroni, W., Leligou, N., Dembeck, L., Mortensen, Brian Bach, Pickavet, M., Sauze, N. Le, Mahony, M., Berde, B., Eilenberger, G., Dittmann, Lars, Develder, C., Chioaroni, D., Neri, F., Callegati, F., Koerber, W., Stavdas, A., Renaud, M, Rafel, A., Sole-Pareta, J., Cerroni, W., Leligou, N., Dembeck, L., Mortensen, Brian Bach, Pickavet, M., Sauze, N. Le, Mahony, M., Berde, B., and Eilenberger, G.

Abstract

In this paper, promising technologies and a network architecture are presented for future optical packet switched networks. The overall network concept is presented and the major choices are highlighted and compared with alternative solutions. Both long and shorter term approaches are considered, as well as both the wide-area network and multiple-area networks parts of the network. The results presented in this paper were developed in the frame of the research project DAVID (Data And Voice Integration over DWDM) project, funded by the European Commission through the IST-framework.

Published
2003

27. The european ist project david: a viable approach toward optical packet switching

Author

Dittmann, L., primary, Develder, C., additional, Chiaroni, D., additional, Neri, F., additional, Callegati, F., additional, Koerber, W., additional, Stavdas, A., additional, Renaud, M., additional, Rafel, A., additional, Sole-Pareta, J., additional, Cerroni, W., additional, Leligou, N., additional, Dembeck, L., additional, Mortensen, B., additional, Pickavet, M., additional, Le Sauze, N., additional, Mahony, M., additional, Berde, B., additional, and Eilenberger, G., additional

Published
2003
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30. Multiservice optical network: main concepts and first achievements of the ROM program

Author

Gravey, P., primary, Gosselin, S., additional, Guillemont, C., additional, Chiaroni, D., additional, Le Sauze, N., additional, Jourdan, A., additional, Dotaro, E., additional, Barth, D., additional, Bertome, P., additional, Laforest, C., additional, Vial, S., additional, Atmaca, T., additional, Hebuterne, G., additional, El Biaze, H., additional, Laalaoua, R., additional, Gangloff, E., additional, and Kotuliak, I., additional

Published
2001
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37. Effets des anions minéraux sur la décomposition de l'ozone dans l'eau

Author

Sens, M. L., Le Sauze, N., Laplanche, A., Langlais, B., Sens, M. L., Le Sauze, N., Laplanche, A., and Langlais, B.

Abstract

L'influence des anions minéraux sur la décomposition de l'ozone est étudiée. Les expériences mettent en oeuvre les anions SO42-, PO43-, BO33-, SiO22-, NO3-, HCO3-+ CO32- à des concentrations identiques à celles habituellement rencontrées dans le domaine des eaux potables. Un plan d'expérience simple qui permet d'attribuer ou non une influence à chaque espèce minérale et de voir l'interaction éventuelle avec le pH est utilisé. Les manipulations sont réalisées sur un pilote de laboratoire conçu pour éliminer toutes traces de matières organiques.L'étude fait apparaître que seuls les carbonates et les bicarbonates ont une influence notable sur cette décomposition et que le pH interfère en jouant sur l'équilibre carbonates-bicarbonates. Ceci permet de vérifier l'équation théorique établie par YURTERI et GUROL (1988) en l'absence de matières organiques. L'ordre apparent de la réaction varie entre 1 et 2 : ordre 2 pour les teneurs en bicarbonates faibles (30 mg.l-1) et ordre 1 pour une teneur forte (300 mg.l-1) lorsque le pH basique déplace l'équilibre vers les carbonates. Pour 300 mg.l-1 et des pH neutres l'ordre de la réaction oscille entre 1,5 et 2. Pour un ordre 1, on peut calculer la constante d'initiation de la décomposition de l'oxydant par l'ion hydroxyle OH- (k = 80 l.mol-1 s-1)., The influence of anionic mineral species on the decomposition of ozone in water was studied. The experiments involved the anions SO42-, PO43-, BO33-, SiO22-, NO3-, HCO3-+ CO32- at concentrations identical to those usually found in drinking water. The manipulations were carried out with a simple experimental procedure which allowed to determine whether or not the mineral species had an influence on this decomposition and to observe thereof the effect of the pH. A laboratory pilot made of glass and teflon, in order to eliminate any traces of organic compounds, was used.Results of this work prove that only the carbonates and bicarbonates have a notable influence on this decomposition and that the pH interferes by disrupting the bicarbonate-carbonate equilibrium. The theoretical equation established without organic compounds by YURTERI and GUROL (1988) is verified.The order of the reaction varies from 1 to 2. The order is 1 when the amount of bicarbonates is weak (30 mg/l). The order is 2 in the case of a 300 mg.l-1 concentration when the basic pH changes the equilibrium towards the carbonates. For 300 mg.l-1 concentrations and a neutral pH, the order of the reaction reaches values from 1,5 to 2. In the case of an order 1, the constant rate of the oxidant decomposition by hydroxyle ion OH¯ is calculated. Its value is 80 l.mol-1 s-1.

Published
1990
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48. Benchmarking and viability assessment of optical packet switching for metro networks.

Author

Develder, C., Stavdas, A., Bianco, A., Careglio, D., Lnsethagen, H., Gimenez, J.P.F.-P., Van Caenegem, R., Sygletos, S., Neri, F., Sole-Pareta, J., Pickavet, M., Le Sauze, N., and Demeester, P.

Abstract

Optical packet switching (OPS) has been proposed as a strong candidate for future metro networks. This paper assesses the viability of an OPS-based ring architecture as proposed within the research project DAVID (Data And Voice Integration on DWDM), funded by the European Commission through the Information Society Technologies (IST) framework. Its feasibility is discussed from a physical-layer point of view, and its limitations in size are explored. Through dimensioning studies, we show that the proposed OPS architecture is competitive with respect to alternative metropolitan area network (MAN) approaches, including synchronous digital hierarchy, resilient packet rings (RPR), and star-based Ethernet. Finally, the proposed OPS architectures are discussed from a logical performance point of view, and a high-quality scheduling algorithm to control the packet-switching operations in the rings is explained. [ABSTRACT FROM PUBLISHER]

Published
2004
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50. Intracellular ribonucleoprotein complexes of visna virus are infectious

Author

Filippi, P, Vigne, R, Quérat, G, Jouanny, C, and Sauze, N

Abstract

Sheep choroid plexus cells infected with visna virus produce intracytoplasmic viral ribonucleoprotein complexes with sedimentation values of 120S to 200S and buoyant densities of 1.29 to 1.32 g/cm3. These ribonucleoprotein complexes display an endogenous RNA-directed DNA polymerase activity and contain all of the species of RNA associated with polysomes. An analysis of the polypeptides present in the ribonucleoproteins allowed us to identify the mature internal virion core proteins and their precursor, Pr55gag, as well as the glycosylated envelope precursor gPr150env and small amounts of mature glycoprotein gp135. Ultracentrifugation-purified ribonucleoproteins could infect sheep choroid plexus cells and led to a normal lytic cycle with virus production. Our results suggest that visna virus can propagate by means of intracellular infectious particles.

Published
1982
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