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667 results on '"Lacroix R"'

6. PB1065 Microvesicles Display Opposite Coagulolytic Balances According to Their Cellular Origin and Activation Status

Author

Konkoth, A., primary, Bonifay, A., additional, Chareyre, C., additional, Abdili, E., additional, Plantureux, L., additional, Robert, S., additional, Franco, C., additional, Bouriche, T., additional, Cointe, S., additional, Poncelet, P., additional, Dignat-George, F., additional, Koenen, R., additional, and Lacroix, R., additional

Published
2023
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8. Standardization of extracellular vesicle measurements by flow cytometry through vesicle diameter approximation

Author

van der Pol, E., Sturk, A., van Leeuwen, T., Nieuwland, R., Coumans, F., Mobarrez, F., Arkesteijn, G., Wauben, M., Siljander, P. R.‐M., Sánchez‐López, V., Otero‐Candelera, R., Ramón, L.A., Dolz, S., Vila, V., Mackman, N., Geddings, J., Mullier, F., Bailly, N., Han, J.‐Y., Kwaan, H.C., Weiss, I.M., Buzás, E.I., Pállinger, E., Harrison, P., Kraan, J., Hedley, B.D., LazoLangner, A., Enjeti, A., Norris, P.J., Paris, C., Susen, S., Bonnefoy, A., Delorme, I., Chandler, W.L., Hau, C., Aass, H.C.D., Connor, D., Wu, X., Dragovic, R., Uotila, L.M., Lacroix, R., and Robert, S.

Published
2018
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29. Iron-Nicarbazin derived platinum group metal-free electrocatalyst in scalable-size air-breathing cathodes for microbial fuel cells

Author

Erable B, Oliot M, Lacroix R, Bergel A, Serov A, Kodali M, Santoro C, Atanassov P., Laboratoire de Génie Chimique (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, 6T-MIC Ingénieries (FRANCE), The University of New Mexico [Albuquerque], 6T-MIC Ingenieries (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), University of New Mexico - UNM (USA), Institut National Polytechnique de Toulouse - INPT (FRANCE), Erable, B, Oliot, M, Lacroix, R, Bergel, A, Serov, A, Kodali, M, Santoro, C, and Atanassov, P

Subjects
[SDV.BIO]Life Sciences [q-bio]/Biotechnology, Microbial fuel cell, Article, PGM-Free catalysts, Oxygen reduction reaction, [CHIM.GENI]Chemical Sciences/Chemical engineering, Chemical Engineering(all), Electrochemistry, Génie chimique, Cathode, Génie des procédés, [CHIM.OTHE]Chemical Sciences/Other, Power generation
Abstract

In this work, a platinum group metal-free (PGM-free) catalyst based on iron as transitional metal and Nicarbazin (NCB) as low cost organic precursor was synthesized using Sacrificial Support Method (SSM). The catalyst was then incorporated into a large area air-breathing cathode fabricated by pressing with a large diameter pellet die. The electrochemical tests in abiotic conditions revealed that after a couple of weeks of successful operation, the electrode experienced drop in performances in reason of electrolyte leakage, which was not an issue with the smaller electrodes. A decrease in the hydrophobic properties over time and a consequent cathode flooding was suspected to be the cause. On the other side, in the present work, for the first time, it was demonstrated the proof of principle and provided initial guidance for manufacturing MFC electrodes with large geometric areas. The tests in MFCs showed a maximum power density of 1.85 W m−2. The MFCs performances due to the addition of Fe-NCB were much higher compared to the iron-free material. A numerical model using Nernst-Monod and Butler-Volmer equations were used to predict the effect of electrolyte solution conductivity and distance anode-cathode on the overall MFC power output. Considering the existing conditions, the higher overall power predicted was 3.6 mW at 22.2 S m−1 and at inter-electrode distance of 1 cm., Graphical abstract Iron-Nicarbazin derived platinum group metal-free electrocatalyst was incorporated into a scalable-size air-breathing cathodes and tested in microbial fuel cells. Maximum power density of 1.85 W m−2 was achieved initially and then decreased to 1.25 W m−2 after 22 days operations.Image 1, Highlights • Fe-based material was used as catalyst for ORR in MFCs. • The catalyst was incorporated into a scalable-size air breathing cathode. • MFC had an initial power density of 1.85 W m−2. • The effect of solution conductivity and electrodes distance is evaluated on MFC performance. • Higher power predicted was 3.6 mW at 22.2 S m−1 and at electrode distance of 1 cm.

Published
2018
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33. Complex effects of kinase localization revealed by compartment-specific regulation of protein kinase A activity

Author

LaCroix R, Andre Levchenko, and Benjamin Lin

Subjects
Kinase, Chemistry, Protein subunit, food and beverages, Directionality, Compartment (development), Cell migration, Chromosomal translocation, Kinase activity, Protein kinase A, Cell biology
Abstract

SummaryKinase activity in signaling networks frequently depends on regulatory subunits that can both inhibit activity by interacting with the catalytic subunits and target the kinase to distinct molecular partners and subcellular compartments. Here, using a new synthetic molecular interaction system, we show that translocation of a regulatory subunit of the protein kinase A (PKA-R) to the plasma membrane has a paradoxical effect on the membrane kinase activity. It can both enhance it at lower translocation levels, even in the absence of signaling inputs, and inhibit it at higher translocation levels, suggesting its role as a linker that can both couple and decouple signaling processes in a concentration-dependent manner. We further demonstrate that superposition of gradients of PKA-R abundance across single cells can control the directionality of cell migration, reversing it at high enough input levels. Thus complex in vivo patterns of PKA-R localization can drive complex phenotypes, including cell migration.

Published
2021
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37. Iron-Nicarbazin Derived Platinum Group Metal-free Electrocatalyst in Scalable-size Air-breathing Cathodes for Microbial Fuel Cells

Author

Erable, B, Oliot, M, Lacroix, R, Bergel, A, Serov, A, Kodali, M, Santoro, C, Atanassov, P, Erable B, Oliot M, Lacroix R, Bergel A, Serov A, Kodali M, Santoro C, Atanassov P., Erable, B, Oliot, M, Lacroix, R, Bergel, A, Serov, A, Kodali, M, Santoro, C, Atanassov, P, Erable B, Oliot M, Lacroix R, Bergel A, Serov A, Kodali M, Santoro C, and Atanassov P.

Abstract

In this work, a platinum group metal-free (PGM-free) catalyst based on iron as transitional metal and Nicarbazin (NCB) as low cost organic precursor was synthesized using Sacrificial Support Method (SSM). The catalyst was then incorporated into a large area air-breathing cathode fabricated by pressing with a large diameter pellet die. The electrochemical tests in abiotic conditions revealed that after a couple of weeks of successful operation, the electrode experienced drop in performances in reason of electrolyte leakage, which was not an issue with the smaller electrodes. A decrease in the hydrophobic properties over time and a consequent cathode flooding was suspected to be the cause. On the other side, in the present work, for the first time, it was demonstrated the proof of principle and provided initial guidance for manufacturing MFC electrodes with large geometric areas. The tests in MFCs showed a maximum power density of 1.85 W m−2. The MFCs performances due to the addition of Fe-NCB were much higher compared to the iron-free material. A numerical model using Nernst-Monod and Butler-Volmer equations were used to predict the effect of electrolyte solution conductivity and distance anode-cathode on the overall MFC power output. Considering the existing conditions, the higher overall power predicted was 3.6 mW at 22.2 S m−1 and at inter-electrode distance of 1 cm

Published
2018

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