203 results on '"Rodrigo, Sebastian"'
Search Results
2. Brain 18 F-FDG PET reveals cortico-subcortical hypermetabolic dysfunction in juvenile neuropsychiatric systemic lupus erythematosus
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Rodrigo, Sebastian, Costi, Stefania, Ellul, Pierre, Aubart, Melodie, Boddaert, Nathalie, Auvin, Stephane, Elmaleh, Monique, Ntorkou, Alexandra, Bader-Meunier, Brigitte, Lebon, Vincent, Melki, Isabelle, and Chiron, Catherine
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- 2024
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3. Parametric Imaging of P-Glycoprotein Function at the Blood–Brain Barrier Using kE,brain-maps Generated from [11C]Metoclopramide PET Data in Rats, Nonhuman Primates and Humans
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Breuil, Louise, El Biali, Myriam, Vodovar, Dominique, Marie, Solène, Auvity, Sylvain, Bauer, Martin, Goutal, Sébastien, Rodrigo, Sebastian, Langer, Oliver, and Tournier, Nicolas
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- 2023
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4. Experimental evidence of pressure effects on spinel dissolution and peridotite serpentinization kinetics under shallow hydrothermal conditions
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Portella, Yuri de Melo, Conceição, Rommulo Vieira, Siqueira, Tiago Abreu, Gomes, Lucas Bonan, and Iglesias, Rodrigo Sebastian
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- 2024
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5. [18F]DPA-714 PET imaging: a new tool to reveal the hidden part of focal drug-resistant epilepsy?
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Cheval, Margaux, Rodrigo, Sebastian, Petrescu, Ana Maria, Leroy, Claire, and Bouilleret, Viviane
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- 2023
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6. Clustering of Twitter Networks Based on Users' Structural Profile.
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Marisol Flores-Garrido, Luis Miguel García-Velázquez, and Rodrigo Sebastian Cortez-Madrigal
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- 2022
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7. Clustering of Twitter Networks Based on Users’ Structural Profile
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Flores-Garrido, Marisol, García-Velázquez, Luis Miguel, Cortez-Madrigal, Rodrigo Sebastian, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Vergara-Villegas, Osslan Osiris, editor, Cruz-Sánchez, Vianey Guadalupe, editor, Sossa-Azuela, Juan Humberto, editor, Carrasco-Ochoa, Jesús Ariel, editor, Martínez-Trinidad, José Francisco, editor, and Olvera-López, José Arturo, editor
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- 2022
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8. Modelling the dynamic response of shallow methane hydrates to simultaneous sea level and bottom water temperatures variations since the last glacial maximum on the Amazon Deep-Sea Fan, Brazil
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Braga, Rafael, Vecchia, Felipe Dalla, and Iglesias, Rodrigo Sebastian
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- 2022
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9. [11C]Metoclopramide PET can detect a seizure-induced up-regulation of cerebral P-glycoprotein in epilepsy patients.
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Biali, Myriam El, Breuil, Louise, Jackwerth, Matthias, Mairinger, Severin, Weber, Maria, Wölfl-Duchek, Michael, Bamminger, Karsten, Rausch, Ivo, Nics, Lukas, Hacker, Marcus, Rodrigo, Sebastian, Bouilleret, Viviane, Zeitlinger, Markus, Pataraia, Ekaterina, Tournier, Nicolas, Bauer, Martin, and Langer, Oliver
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TEMPORAL lobe ,POSITRON emission tomography ,TEMPORAL lobe epilepsy ,BRAIN diseases ,CHOROID plexus - Abstract
Background: P-glycoprotein (P-gp) is an efflux transporter which is abundantly expressed at the blood-brain barrier (BBB) and which has been implicated in the pathophysiology of various brain diseases. The radiolabelled antiemetic drug [
11 C]metoclopramide is a P-gp substrate for positron emission tomography (PET) imaging of P-gp function at the BBB. To assess whether [11 C]metoclopramide can detect increased P-gp function in the human brain, we employed drug-resistant temporal lobe epilepsy (TLE) as a model disease with a well characterised, regional P-gp up-regulation at the BBB. Methods: Eight patients with drug-resistant (DRE) TLE, 5 seizure-free patients with drug-sensitive (DSE) focal epilepsy, and 15 healthy subjects underwent brain PET imaging with [11 C]metoclopramide on a fully-integrated PET/MRI system. Concurrent with PET, arterial blood sampling was performed to generate a metabolite-corrected arterial plasma input function for kinetic modelling. The choroid plexus was outmasked on the PET images to remove signal contamination from the neighbouring hippocampus. Using a brain atlas, 10 temporal lobe sub-regions were defined and analysed with a 1-tissue-2-rate constant compartmental model to estimate the rate constants for radiotracer transfer from plasma to brain (K1 ) and from brain to plasma (k2 ), and the total volume of distribution (VT = K1 /k2 ). Results: DRE patients but not DSE patients showed significantly higher k2 values and a trend towards lower VT values in several temporal lobe sub-regions located ipsilateral to the epileptic focus as compared to healthy subjects (k2 : hippocampus: +34%, anterior temporal lobe, medial part: +28%, superior temporal gyrus, posterior part: +21%). Conclusions: [11 C]Metoclopramide PET can detect a seizure-induced P-gp up-regulation in the epileptic brain. The efflux rate constant k2 seems to be the most sensitive parameter to measure increased P-gp function with [11 C]metoclopramide. Our study provides evidence that disease-induced alterations in P-gp expression at the BBB can lead to changes in the distribution of a central nervous system-active drug to the human brain, which could affect the efficacy and/or safety of drugs. [11 C]Metoclopramide PET may be used to assess or predict the contribution of increased P-gp function to drug resistance and disease pathophysiology in various brain diseases. Trial registration: EudraCT 2019-003137-42. Registered 28 February 2020. [ABSTRACT FROM AUTHOR]- Published
- 2024
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10. 18F-FDG PET/MR in focal epilepsy: A new step for improving the detection of epileptogenic lesions
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Flaus, Anthime, Mellerio, Charles, Rodrigo, Sebastian, Brulon, Vincent, Lebon, Vincent, and Chassoux, Francine
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- 2021
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11. 18 F-FDG-PET hypometabolic pattern reveals multifocal epileptic foci despite limited unique stereotyped seizures
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Taussig, Delphine, Petrescu, Ana Maria, Aghakhani, Nozar, Herbrecht, Anne, Dorfmüller, Georg, Ferrand-Sorbets, Sarah, Chipaux, Mathilde, Fohlen, Martine, Rodrigo, Sebastian, and Bouilleret, Viviane
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- 2021
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12. Could the Interaction between Arbuscular Mycorrhizal Fungi and Biostimulants Improve the Plant Physiological Status of Prosopis alba Seedlings?
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Ana Carolina Santacruz-García, Adriana Teresita Gomez, María Gracia Senilliani, Analia del Valle Guzmán, Mónica Beatriz Sagadin, Mauricio Ewens, Rodrigo Sebastian Frías, Cristian Coria, Joaquín Gómez, and Mónica Azucena Nazareno
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algarrobo blanco ,Chaco ,mycorrhizae ,plant physiological status ,AMF ,Environmental sciences ,GE1-350 - Abstract
This study aimed to evaluate the synergy between arbuscular mycorrhizal fungi (AMF) and foliar biostimulant applications (phytoextracts) on an important Argentinian forest native species (Prosopis alba) during the nursery stage. We tested biochemical parameters (MDA, malondialdehyde, an oxidative stress biomarker, and photosynthetic pigments) on P. alba seedlings sprayed with three different phytoextracts and inoculated with mycorrhizal strains of different local origins. Considering that the statistical model was not significant at the preliminary level, we did not observe synergism between the different forms of bioinsumes evaluated by analysing biochemical characteristics. However, regardless of AMF inoculation, plants with foliar applications of Larrea divaricata at 3% w/v showed a lower accumulation of the oxidative stress biomarker, MDA and a lower total carotenoid content (p > 0.1). Although there were no significant differences, trends indicate positive relationships between neck diameter and mycorrhizal response in plants treated with M1 with foliar applications of Larrea divaricata at 3% w/v. However, height does not consistently respond to mycorrhizae interacting with biostimulants. Consequently, deeper analysis is needed to understand the effect of the interaction between AMF with biostimulants for improving the plant’s physiological status. Deepening research in this regard will result in significant benefits for restoration activities.
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- 2022
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13. [18F]DPA-714 PET Imaging in the Presurgical Evaluation of Patients With Drug-Resistant Focal Epilepsy
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Cheval, Margaux, primary, Rodrigo, Sebastian, additional, Taussig, Delphine, additional, Caillé, Fabien, additional, Petrescu, Ana Maria, additional, Bottlaender, Michel, additional, Tournier, Nicolas, additional, Besson, Florent L., additional, Leroy, Claire, additional, and Bouilleret, Viviane, additional
- Published
- 2023
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14. Parametric Imaging of P-Glycoprotein Function at the Blood–Brain Barrier Using kE,brain-maps Generated from [11C]Metoclopramide PET Data in Rats, Nonhuman Primates and Humans.
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Breuil, Louise, El Biali, Myriam, Vodovar, Dominique, Marie, Solène, Auvity, Sylvain, Bauer, Martin, Goutal, Sébastien, Rodrigo, Sebastian, Langer, Oliver, and Tournier, Nicolas
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RATS ,BLOOD-brain barrier ,METOCLOPRAMIDE ,P-glycoprotein ,PRIMATES ,POSITRON emission tomography ,BABOONS - Abstract
Purpose: PET imaging using [
11 C]metoclopramide revealed the importance of P-glycoprotein (P-gp, ABCB1) in mediating the brain-to-blood efflux of substrates across the blood–brain barrier (BBB). In this work, the elimination rate constant from the brain (kE,brain ), calculated from dynamic PET images without the need for arterial blood sampling, was evaluated as an outcome parameter for the interpretation of [11 C]metoclopramide PET data. Procedures: kE,brain parameter was obtained by linear regression of log-transformed brain time-activity curves (TACs). kE,brain values (h−1 ) obtained under baseline conditions were compared with values obtained after complete P-gp inhibition using tariquidar in rats (n = 4) and baboons (n = 4) or after partial inhibition using cyclosporine A in humans (n = 10). In baboons, the sensitivity of kE,brain to measure complete P-gp inhibition was compared with outcome parameters derived from kinetic modeling using a 1-tissue compartment model (1-TCM). Finally, kE,brain -maps were generated in each species using PMOD software. Results: The linear part of the log-transformed brain TACs occurred from 10 to 30 min after radiotracer injection in rats, from 15 to 60 min in baboons, and from 20 to 60 min in humans. P-gp inhibition significantly decreased kE,brain values by 39 ± 12% in rats (p < 0.01), by 32 ± 6% in baboons (p < 0.001), and by 37 ± 22% in humans (p < 0.001). In baboons, P-gp inhibition consistently decreased the brain-to-plasma efflux rate constant k2 (36 ± 9%, p < 0.01) leading to an increase in the total brain volume of distribution (VT , 101 ± 12%, p < 0.001). In all studied species, brain kE,brain -maps displayed decreased P-gp-mediated efflux across the BBB. Conclusions: kE,brain of [11 C]metoclopramide provides a simple outcome parameter to describe P-gp function in the living brain when arterial input function data are unavailable, although less sensitive than VT . kE,brain -maps represent easy to compute parametric images reflecting the effect of P-gp on [11 C]metoclopramide elimination from the brain. [ABSTRACT FROM AUTHOR]- Published
- 2023
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15. Parametric imaging of P-glycoprotein function at the blood-brain barrier using kE,brain-maps generated from [11C]metoclopramide PET data in rats, nonhuman primates and humans
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BREUIL, Louise, primary, ELBIALI, Myriam, additional, VODOVAR, Dominique, additional, MARIE, Solène, additional, AUVITY, Sylvain, additional, BAUER, Martin, additional, GOUTAL, Sébastien, additional, RODRIGO, Sebastian, additional, LANGER, Oliver, additional, and Tournier, Nicolas, additional
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- 2023
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16. [18F]DPA-714 PET Imaging in the Presurgical Evaluation of Patients With Drug-Resistant Focal Epilepsy.
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Cheval, Margaux, Rodrigo, Sebastian, Taussig, Delphine, Caillé, Fabien, Petrescu, Ana Maria, Bottlaender, Michel, Tournier, Nicolas, Besson, Florent L., Leroy, Claire, and Bouilleret, Viviane
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- 2023
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17. Referee report. For: Progress for carbon dioxide geological storage in West Macedonia: A field and laboratory-based survey [version 1; peer review: 1 approved]
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Iglesias, Rodrigo Sebastian
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- 2023
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18. Cálculo de la relación insumo/producto ciclo 2020-2021 para la producción de uva en diferentes destinos
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Espindola, Rodrigo Sebastian, Vargas, Mercedes, and Molina, José
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VIinificación ,Agricultural Planning ,Costos de Producción ,Production Costs ,Vid ,Planificación Agrícola ,Grapevines ,Winemaking - Abstract
Los productores suelen contar con parte de su producción, en kg de uva, para realizar inversiones o mejoras. En este sentido, se puede evaluar cómo varía la relación insumo/producto teniendo presente el destino de la producción, su valor y rendimiento por hectárea. Es decir, conocer con precisión la cantidad de kilogramos de uva que son necesarios para cada tipo de labor y facilitar procesos de planificación y gestión de costos. Se trabajó con 15 casos de productores de uva para diferentes destinos de Caucete, 25 de Mayo, 9 de Julio y Albardón. Se registró durante un ciclo completo los insumos consumidos por actividad-hectárea y también se registró la producción en kg/ha. Se asoció la producción a sus valores venales por destino al igual que los insumos consumidos durante un ciclo completo desde poda hasta cosecha. Se observó que siempre las variedades de menor valor (uvas comunes), se asocian a una mayor relación que las uvas de mayor valor (uvas de vinificar). Son necesarios desde 6.500 kg/ha hasta 14.500 kg/ha para alcanzar el punto de equilibro de un viñedo. Un valor menor a 10.000 kg/ha se relaciona con pérdidas, ya que no se alcanzaría a cubrir el costo operativo. EEA San Juan Fil: Espíndola, Rodrigo Sebastián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; Argentina. Fil: Vargas, Mercedes. Universidad Nacional de San Juan. Facultad de Ingeniería; Argentina Fil: Molina, José. Corporación Vitivinícola Argentina (COVIAR); Argentina
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- 2022
19. Could the Interaction between Arbuscular Mycorrhizal Fungi and Biostimulants Improve the Plant Physiological Status of Prosopis alba Seedlings?
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Santacruz-García, Ana Carolina, primary, Gomez, Adriana Teresita, additional, Senilliani, María Gracia, additional, Guzmán, Analia del Valle, additional, Sagadin, Mónica Beatriz, additional, Ewens, Mauricio, additional, Frías, Rodrigo Sebastian, additional, Coria, Cristian, additional, Gómez, Joaquín, additional, and Nazareno, Mónica Azucena, additional
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- 2022
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20. [18F]DPA-714 PET imaging: a new tool to reveal the hidden part of focal drug-resistant epilepsy?
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Cheval, Margaux, primary, Rodrigo, Sebastian, additional, Petrescu, Ana Maria, additional, Leroy, Claire, additional, and Bouilleret, Viviane, additional
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- 2022
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21. Pretherapeutic Functional Magnetic Resonance Imaging in Children
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Hertz-Pannier, Lucie, Noulhiane, Marion, Rodrigo, Sebastian, and Chiron, Catherine
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- 2014
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22. Examining natural mentoring relationships (NMRs) among self-identified gay, bisexual, and questioning (GBQ) male youth
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Torres, Rodrigo Sebastián, Harper, Gary W., Sánchez, Bernadette, and Fernández, M. Isabel
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- 2012
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23. Antiquity and Modernity [Book Review]
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Braicovich, Rodrigo Sebastian
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- 2009
24. Epicteto: el determinismo epistémico y la potencia causal del lógos
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Braicovich, Rodrigo Sebastián
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- 2011
25. Secado de uva en planta
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Espindola, Rodrigo Sebastian
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Secado ,San Juan, Argentina ,Production ,Manejo del Cultivo ,Vid ,Producción ,Crop Management ,Grapevines ,Drying - Abstract
En San Juan se introdujo en el año 2007 la tecnología de secado de uva en planta o Dry on the Vine (DOV) en el primer Simposio Internacional de Uva de Mesa y Pasas organizado por INTA . El esfuerzo conjunto entre el sector público y privado, en los últimos quince años, permitió una mejora en el nivel de adopción de tecnología de productores de uva para pasa. Hoy existen más de 150 productores paseros que aplican DOV en Cuyo. Este libro muestra los resultados de estudios sobre esta tecnología, la opinión de cinco productores innovadores del sector pasero sanjuanino y las recomendaciones de Mathew Fidelibus, experto del Centro de Investigación y Extensión Kearny de la Universidad de California, Davis. Se considera que la tecnología DOV es reciente en Argentina, no así en el mundo (data de 1950 en Australia y adoptada por California, Estados Unidos en el año 2000). Se plantea como una alternativa tecnológica ahorradora de mano de obra. Es importante aclarar que la aplicación de tecnología DOV requiere de estudio, formación y capacitación, ya que hay que generar un cambio cultural sobre la concepción de los sistemas de poda. Una de las dificultades más importantes para enfrentar no estará en el uso de la tecnología, sino en la costumbre de quien maneja la tijera de poda. La tecnología DOV representa una verdadera estrategia para generar un ahorro de costos, aumentar el valor agregado sin la necesidad de tener una playa de secado y lograr mejor calidad de pasas. Estos factores, tomados como una ventaja competitiva, permitirán mayor aptitud y mejor acceso al mercado internacional. Este trabajo está dividido en capítulos bajo el siguiente orden: 1) Generalidades sobre el sistema DOV y sistemas de producción de pasas; 2) Estudios locales sobre la variedad Superior Seedless; 3) Estudios locales sobre la variedad Flame Seedless; 4) Calidad de pasas DOV; 5) La experiencia de los productores locales y 6) Tips para el armado de un DOV y Espaldero DOV. Así, el lector podrá sacar sus propias conclusiones sobre la conveniencia económica y técnica de uso de sistemas DOV en San Juan. El capítulo I es una recopilación bibliográfica que detalla aspectos económicos y técnicos para quien desee profundizar sobre aspectos de la aplicación de DOV, en particular y sobre vitivinicultura, en general. EEA San Juan Fil: Espíndola, Rodrigo Sebastián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; Argentina.
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- 2022
26. FREEDOM AND DETERMINISM IN EPICTETUS' DISCOURSES
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BRAICOVICH, RODRIGO SEBASTIÁN
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- 2010
27. Modulation of encoding and retrieval by recollection and familiarity: Mapping the medial temporal lobe networks
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de Vanssay-Maigne, Aimée, Noulhiane, Marion, Devauchelle, Anne D., Rodrigo, Sebastian, Baudoin-Chial, Sonia, Meder, Jean F., Oppenheim, Catherine, Chiron, Catherine, and Chassoux, Francine
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- 2011
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28. International Commercial Transactions
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Jones, Paul, Treneva, Natalia, Gilbert, Jan, Sepulchre, Joe, Flohr, Eckhard, Hero, Marco, Vázquez, Eva M., and Rodrigo, Sebastián C.
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- 2007
29. Optimizing statistical parametric mapping analysis of 18F-FDG PET in children
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Archambaud, Frederique, Bouilleret, Viviane, Hertz-Pannier, Lucie, Chaumet-Riffaud, Philippe, Rodrigo, Sebastian, Dulac, Olivier, Chassoux, Francine, and Chiron, Catherine
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- 2013
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30. Formas de hacer injertos en vid
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Espindola, Rodrigo Sebastian
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Grafting ,Injerto ,Vid ,Portainjertos ,Plantas para Patrón ,Rootstock Crops ,Grapevines ,Rootstocks - Abstract
Este texto aspira a contribuir con la divulgación de los principios básicos sobre la técnica de injertación en vid, siendo una recopilación de las prácticas más difundidas. Esta técnica es muy utilizada en varios frutales para realizar cambios de variedad en cultivos implantados o para otorgarle una cualidad resistente a las raíces de una planta, según algún problema existente en el suelo (salinidad, anoxia, filoxera o nematodos, entre otros). En este texto se describe el modo de realizar injertos de invierno y de verano en vid; sus ventajas y desventajas. Se evita expresar en este compilado un mero recetario y se tratará, siempre que sea posible, de expresar los fundamentos técnicos para cada práctica. Este texto comienza con una de las clasificaciones de tipos de injertos, la que se consideró más simple, ya que existe más de una clasificación. Luego se explican las condiciones ideales para injertar y se detalla cada tipo, ilustrando los procesos. EEA San Juan Fil: Espíndola, Rodrigo Sebastián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; Argentina.
- Published
- 2021
31. CO2‐water‐rock interactions in undeformed and sheared claystone caprocks from Northern Europe
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Vernooij, Roland, Siqueira, Tiago de Abreu, Hangx, Suzanne, Spiers, Christopher, Ketzer, Marcelo, Iglesias, Rodrigo Sebastian, Experimental rock deformation, and Earth and Climate
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Environmental Engineering ,water-rock interaction ,Dolomite ,Geochemistry ,02 engineering and technology ,010501 environmental sciences ,engineering.material ,01 natural sciences ,caprock ,chemistry.chemical_compound ,020401 chemical engineering ,Brining ,Caprock ,shear fracture ,SDG 13 - Climate Action ,Kaolinite ,Environmental Chemistry ,0204 chemical engineering ,Dissolution ,Chlorite ,0105 earth and related environmental sciences ,Mineral ,CCS ,chemistry ,Illite ,engineering ,Geology - Abstract
One of the most promising, cost-effective, and readily available technologies for reducing greenhouse gas emissions to the atmosphere is the capture and separation of CO2 from large stationary sources and storage in geological formations. Storage security, especially in the early stages of operation, is mostly guaranteed by caprock formations with very low permeability overlying the reservoir, capable of containing the injected fluid. Chemical alterations of the formation brine, caused by CO2 injection may cause dissolution and precipitation of secondary minerals, potentially increasing the risks of leakage from the reservoir. In order to evaluate these processes and their potential to induce the formation of leakage pathways in ultrafine fault gouges, a series of batch experiments was performed on crushed and sheared samples from three different caprock formations from Northern Europe (Sollingen, Röt and Opalinus claystones). The experiments were supported by numerical models of the kinetics of mineral dissolution and precipitation simulating the same experimental conditions, and over a longer time (10 000 years). Minor mineral alterations were observed after the batch experiments, the most important being: illite dissolution for the Opalinus and Röt formation samples, and dolomite dissolution and the transformation of illite and chlorite into kaolinite for the Sollingen sample. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.
- Published
- 2021
32. Manual de identidad y estrategia digital en Facebook e Instagram de Medplus
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Miraval Umpire, Rodrigo Sebastian and Sanchez Beltrán, Patricia
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Manuales técnicos ,Logos (Symbols) ,Technical manuals ,Logotipos (Símbolos) ,Visual identity ,Internet marketing ,Identidad visual ,Atención médica a domicilio ,Home care services ,Redes sociales ,Marketing en Internet ,Social networks - Abstract
Med Plus Perú es una empresa peruana que brinda el servicio de atención médica a domicilio, entre otros servicios. A través de un diseño y estrategia coherente, se creará piezas gráficas en las distintas plataformas digitales, así como elementos que nos permitieron crear un manual de identidad y estrategia digital de la marca en el mercado peruano, para finalmente, impulsar la demanda del servicio. El propósito de Med Plus es brindar un servicio personalizado y de calidad a sus clientes desde la comodidad de su hogar con profesional altamente calificado y con las adecuadas herramientas de trabajo, salvaguardando la integridad y salud del paciente Med Plus Peru is a Peruvian company that provides home health care service, among other services. Through a coherent design and strategy, graphic pieces will be created on the different digital platforms, as well as elements that allowed us to create a brand identity and digital strategy manual in the Peruvian market, to finally boost the demand for the service. The purpose of Med Plus is to provide a personalized and quality service to its clients from the comfort of their home with a highly qualified professional and with the appropriate work tools, safeguarding the integrity and health of the patient.
- Published
- 2021
33. Estudo da precipitação de silicatos magnesianos a partir da coluna de água visando a compreensão da diagênese do pré-sal
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Dalla Vecchia, Felipe, Iglesias, Rodrigo Sebastian, Dalla Vecchia, Felipe, and Iglesias, Rodrigo Sebastian
- Abstract
O processo de evaporação e de precipitação em sistemas lacustres alcalinos pode ser um elemento chave para explicar a mineralogia encontrada nos reservatórios do pré-sal. Entretanto, simular condições de precipitação destes minerais em laboratório, majoritariamente estevensita/kerolita, calcita e dolomita, é um desafio uma vez que, além de escassos na literatura, são difíceis de serem realizados. Nesse sentido, a modelagem geoquímica auxilia a realização de experimentos geoquímicos através de softwares que permitem a simulação dos processos de evaporação e de precipitação de filossilicatos magnesianos e de carbonatos. No presente trabalho, a fim de estudar a precipitação de estevensita/kerolita e de calcita, a partir da coluna d’água, foram realizados experimentos de evaporação controlada, em escala laboratorial, utilizando lâminas de vidro dispostas em um copo de Becker em níveis diferentes, contendo uma solução sintetizada equivalente à composição Lago Mono (EUA), um análogo dos lagos precursores do pré-sal. Aliada aos experimentos, a modelagem geoquímica indicou que a evaporação é capaz de criar uma supersaturação dando condição para a precipitação do carbonato nos primeiros dias e da estevensita partir do 14º dia. Na fase líquida, observa-se redução da alcalinidade, do cálcio, magnésio e silício em solução durante o processo de evaporação além da formação de minerais como silicatos, carbonatos e sais comuns em sistemas evaporativos como o carbonato de bicarbonato de sódio hidratado (Na3H(CO3)2·2H2O), o sulfato de sódio anidro (Na₂SO₄), o carbonato/sulfato de sódio (Na6(CO3)(SO4)2) e o cloreto de sódio (NaCl)., The evaporation and precipitation process in alkaline lake systems can be a key element to explain the mineralogy found in the pre-salt reservoirs. However, simulating the precipitation conditions of these minerals in the laboratory, mostly stevensite / kerolite, calcite and dolomite, is a challenge. In this sense, geochemical modeling assists to carry out geochemical experiments through software that allows the simulation of the evaporation and precipitation processes of magnesian phyllosilicates and carbonates. In the present work, in order to study the precipitation of stevensite / kerolite and calcite, from the water column, experiments of controlled evaporation were performed, on a laboratory scale, using glass slides arranged in a Becker glass at different levels containing a synthesized solution equivalent to the composition Mono Lake (USA), an analogue of the precursor precursor lakes. Allied to the experiments, the geochemical modeling indicated that the evaporation is capable of creating a supersaturation allowed the precipitation of the carbonate in the first days and of the stevensite from the 14th day. In the liquid phase, there is a reduction in alkalinity, calcium, magnesium and silicon in solution during the evaporation process, in addition to the formation of minerals such as silicates, carbonates and common salts in evaporative systems like hydrated sodium bicarbonate (Na3H(CO3)2·2H2O), anhydrous sodium sulfate (Na₂SO₄), sodium carbonate / sulfate (Na6(CO3)(SO4)2) and sodium chloride (NaCl).
- Published
- 2021
34. Desenvolvimento de metodologia para determinação de alcalinidade por cromatografia iônica em amostras de matriz hipersalina características do pré-sal
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Pires, Marçal José Rodrigues, Iglesias, Rodrigo Sebastian, Pires, Marçal José Rodrigues, and Iglesias, Rodrigo Sebastian
- Abstract
A injeção de CO2 em reservatórios de petróleo para o seu aprisionamento geológico ou para o processo de recuperação avançada de petróleo são alternativas usadas para reduzir os efeitos desse gás na atmosfera. A fim de prever o comportamento do CO2 injetado ao longo dos anos, são realizados um conjunto de análises químicas e modelagens matemáticas. Neste cenário, o teor de alcalinidade da água de formação do reservatório tem grande importância, pois a injeção de CO2 irá ocasionar uma série de reações que podem afetar os processos de dissolução e precipitação de minerais, impactando na segurança e qualidade do armazenamento. A técnica mais difundida para avaliação da alcalinidade é a titulação potenciométrica, a qual tem a desvantagem de exigir grandes volumes de amostra e fornecer resultados pouco precisos.Por isso, o desenvolvimento de uma metodologia com resultados mais confiáveis e que utilize um volume menor de amostra é necessário. Sendo assim, o objetivo deste trabalho foi utilizar a cromatografia iônica, como metodologia para determinar alcalinidade em amostras com composição semelhante as águas de formação encontradas nos reservatórios do Pré-Sal, comparando os resultados obtidos com a titulação potenciométrica e uma metodologia alternativa, a espectrofotometria do UV-visível. A comparação entre os resultados obtidos utilizando as três metodologias citadas demonstrou que a cromatografia iônica possui potencial para a determinação de alcalinidade. Entretanto, houve diferenças significativas entre a nova metodologia e as demais, indicando que o modo de preparo da amostra teve interferência no resultado, e que a metodologia necessita de otimizações que possibilitem uma melhor recuperação do analito de interesse., The CO2 injection into oil reservoirs for geological storage or enhanced oil recovery process (EOR) are alternatives used to reduce the emissions of this gas to the atmosphere. To predict the behavior of the injected CO2 over the years, a set of chemical analyzes and mathematical modeling are carried out. In this scenario, the alkalinity content of the reservoir formation water is of great importance, since the CO2 injection will cause a series of reactions that can affect the mineral dissolution and precipitation processes, affecting the safety and quality of storage. The most widespread technique for alkalinity analysis is potentiometric titration, which has the disadvantage of requiring large sample volumes and providing inaccurate results.Therefore, the development of a methodology with more reliable results and that uses a smaller sample volume is necessary. This way, the objective of this work was to use ion chromatography, as a methodology to determine alkalinity in samples with similar composition to the formation waters found in the Brazilian Pre-Salt reservoirs, comparing the results obtained with potentiometric titration and an alternative methodology, UV-visible spectrophotometry. The comparison between the results obtained using the three methodologies demonstrated that ion chromatography show potential to alkalinity determination. However, there were significant differences between the new methodology and the others, indicating that the sample preparation mode had interference in the result, and that the methodology needs optimizations that allow a better recovery of the analyte of interest.
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- 2021
35. Interações CO2-fluido-rocha aplicadas à injeção de fluidos em reservatórios do pré-sal
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Dalla Vecchia, Felipe, Iglesias, Rodrigo Sebastian, Dalla Vecchia, Felipe, and Iglesias, Rodrigo Sebastian
- Abstract
A recuperação avançada de óleo (Enhanced Oil Recovery - EOR) através da injeção de água do mar, é uma das técnicas mais aplicadas para manter a pressão do reservatório depois da depleção primária, em virtude da abundância de água nas proximidades dos reservatórios e eficiência para deslocar o óleo. Salienta-se que o Pré-sal apresenta altas quantidades de dióxido de carbono (CO2) em sua composição, e com o compromisso global de reduzir as emissões de gases que causam o efeito estufa, o armazenamento geológico é uma boa alternativa para evitar os danos ambientais causados pela emissão deste gás. Desta forma este trabalho teve como objetivo estudar amostras de rocha pulverizada retiradas de um reservatório do pré-sal, e simular os efeitos da injeção de água do mar em altas concentrações de CO2, seja para recuperação avançada de petróleo ou armazenamento geológico de carbono. As interações foram estudadas por meio de experimentos em escala de laboratório, simulando as condições geológicas em reatores (pressão 250 bar de CO2 e 60 °C), através da a alteração no equilíbrio químico no seu interior por intermédio de diluições com água de injeção, observando a interação CO2-fluido-rocha na integridade do reservatório e nos processos de recuperação avançada de petróleo ou armazenamento geológico de CO2.Para a caracterização das rochas pré e pós experimentos, foram realizadas análises de Microscopia Eletrônica de Varredura com Espectroscopia por Energia Dispersiva (MEV EDS) e Difratometria de raios X (DRX). Análises da solução salina antes, durante e após os experimentos foram realizadas por Cromatografia Iônica e Espectroscopia de Emissão Ótica e Plasma Indutivamente Acoplado (ICP - OES) para identificar os íons presentes na solução. Os resultados obtidos neste estudo demostraram variação das taxas de dissolução mineral durante todo o período experimental, com maior evidência nas primeiras horas de reação. Não foi verificada a ocorrência de precipitação., Enhanced Oil Recovery (EOR) through the injection of seawater is one of the most applied techniques to maintain reservoir pressure after primary depletion, due to the abundance of water in the vicinity of the reservoirs and efficiency for displace the oil. It should be noted that the pre-salt has high amounts of carbon dioxide (CO2) in its composition, and with the global commitment to reduce greenhouse gas emissions, geological storage is a good alternative to avoid damage caused by the emission of this gas. Thus, this work aimed to study pulverized rock samples taken from a pre-salt reservoir, and to simulate the effects of the injection of seawater at high concentrations of CO2, either for advanced oil recovery or geological carbon storage.The interactions were studied through laboratory-scale experiments, simulating the geological conditions in reactors (250 bar CO2 pressure and 60 °C), through the change in the chemical balance inside them through dilutions with injection water, observing the CO2-fluid-rock interaction in reservoir integrity and in advanced oil recovery processes or CO2 geological storage. For the characterization of the rocks before and after the experiments, Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM EDS) and X-ray Diffractometry (DRX) were performed. Analyzes of the saline solution before, during and after the experiments were performed by Ion Chromatography and Optical Emission Spectroscopy and Inductively Coupled Plasma (ICP - OES) to identify the ions present in the solution. The results obtained in this study showed variation in mineral dissolution rates throughout the experimental period, with greater evidence in the first hours of reaction. It was not verified the occurrence of precipitation.
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- 2021
36. CO2-water-rock interactions in undeformed and sheared claystone caprocks from Northern Europe
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Experimental rock deformation, Vernooij, Roland, Siqueira, Tiago de Abreu, Hangx, Suzanne, Spiers, Christopher, Ketzer, Marcelo, Iglesias, Rodrigo Sebastian, Experimental rock deformation, Vernooij, Roland, Siqueira, Tiago de Abreu, Hangx, Suzanne, Spiers, Christopher, Ketzer, Marcelo, and Iglesias, Rodrigo Sebastian
- Published
- 2021
37. The archaeological sites of Cafayate and Quebrada de las Conchas (Salta): Advances in the documentation and public communication of cultural heritage
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Ledesma, Rossana Elizabeth, Villarroel, María Jimena, Cardozo, Rodrigo Sebastian, and Torres López, Valentina Lucía
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ARQUEOLOGÍA DE TERRITORIO ,purl.org/becyt/ford/6 [https] ,DATO ARQUEOLÓGICO ,PATRIMONIO ARQUEOLÓGICO ,VALLE CALCHAQUÍ ,purl.org/becyt/ford/6.1 [https] - Abstract
En este trabajo se presenta el registro de sitios arqueológicos de Cafayate y Quebrada de las Conchas. La documentación está acompañada de un análisis sobre el emplazamiento territorial realizado por las poblaciones prehispánicas y una síntesis de las acciones de difusión del patrimonio. Para la prospección sistemática se definieron microrregiones y unidades de paisaje que combinan variables geomorfológicas, tipos de suelo, altitud y vegetación. Posteriormente se correlacionaron los datos de ubicación (Sistema de Información Geográfica), tipo de sitio y cronología. Esto permitió estimar el modelo de emplazamiento de las ocupaciones durante los Períodos de Desarrollos Regionales e Inca. El análisis muestra una intencionalidad en el control de los accesos hacia las quebradas laterales, especialmente aquellos pasos que vinculan el Valle Calchaquí con el Valle del Cajón hacia el oeste, y con Guachipas y La Candelaria hacia el este. Las tareas de difusión del pasado prehispánico han permitido realizar los trabajos de campo, gestionar los permisos de investigación y acceder a las propiedades para realizar investigaciones sistemáticas. Los trabajos de campo son consensuados con las instituciones y comunidades locales como nuevas maneras de investigación. This article presents the results of archaeological studies carried out in Cafayate and Quebrada de las Conchas. Salta, Argentina. We analyze the territorial settings of pre-Hispanic populations and provide a synthesis of public communication activities related to local cultural heritage. The systematic surveys are defined by “microrregiones” and landscape units, which combine geomorphological variables, soil type, altitude and vegetation. Subsequently, we correlate the geographical position data, the type of site and its chronology through GIS and differentiate two settlement models during the “Desarrollos Regionales” and “Inca” periods. The analysis indicates an intention of pre-Hispanic groups to control the accesses to the lateral ravines, especially along the paths that link the Calchaquí Valley with the Cajon Valley to the west, and with Guachipas and La Candelaria to the east. Continuous public communication of scientific results allowed us access to private, public and communal land properties to carry out systematic fieldwork. Based on a paradigm of renovated research protocol, the permissions for archaeological fieldwork were agreed with public institutions and local communities. Fil: Ledesma, Rossana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina Fil: Villarroel, María Jimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina Fil: Cardozo, Rodrigo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina Fil: Torres López, Valentina Lucía. Universidad Nacional de Salta. Facultad de Humanidades; Argentina
- Published
- 2020
38. Modelling the dynamic response of shallow methane hydrates to simultaneous sea level and bottom water temperatures variations since the last glacial maximum on the Amazon Deep-Sea Fan, Brazil
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Rafael Braga, Felipe Dalla Vecchia, and Rodrigo Sebastian Iglesias
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Geophysics ,Stratigraphy ,Economic Geology ,Geology ,Oceanography - Published
- 2022
39. 18f-fdg Pet/mr in Focal Epilepsy: a New Step for Improving the Detection of Epileptogenic Lesions
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FLAUS, Anthime, primary, MELLERIO, Charles, additional, RODRIGO, Sebastian, additional, BRULON, Vincent, additional, LEBON, Vincent, additional, and CHASSOUX, Francine, additional
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- 2021
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40. Cálculo de margen bruto, resultado operativo y rentabilidad con aplicación de análisis de estructura de costos basados en actividades: vid
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Espindola, Rodrigo Sebastian
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Viticulture ,Costos ,Viticultura ,Margen Bruto ,Profitability ,Vid ,Rentabilidad ,Costs - Abstract
La gestión basa en la teoría general de costos es fundamental para tomar decisiones eficientes en las explotaciones agropecuarias. Por otro lado, lo que le da vida al sistema de costeo es el registro de actividades o cuaderno de campo, desde donde se toma la información que alimenta a cualquier diseño de tablero de comando. En la actualidad son numerosas las herramientas que permiten hacer clasificación de costos según su vinculación con el producto, según su variación, por rubro de gastos y/o por actividad. Lo importante es saber que cada ciclo de producción, cuartel, cultivo o variedad presenta diferencias que, si se registran y procesan, permiten un aumento en el beneficio económico. EEA San Juan Fil: Espíndola, Rodrigo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; Argentina
- Published
- 2020
41. Efecto de distintos tipos de poda y contenido de azúcar en la baya sobre el tiempo de secado, rendimiento y reservas : producción de pasas de uva en sistema DOV
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Espindola, Rodrigo Sebastian and Arevalo, Eduardo
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Uvas de Mesa ,Secado ,Pasas ,Raisins ,Vid ,Poda ,Dessert Grapes ,Grapevines ,Drying ,Pruning - Abstract
San Juan es la principal provincia productora de pasas de uvas y la tecnología de secado en planta se introdujo recientemente por lo que no hay suficiente información para productores. Por otra parte, podas cortas o largas, relacionadas con diferentes contenidos de azúcar, podrían generar un perjuicio. Este estudio buscó medir tiempos de secado, rendimientos y contenido de reservas en sistemas de secado dry on the vine (DOV) comparados con el sistema de secado tradicional. Se realizó un diseño aleatorio simple con seis tratamientos y tres repeticiones: podas largas, medias y cortas combinadas con mayor y menor contenido de azúcar al momento de cortar los cargadores para iniciar el secado. Todos los tratamientos tuvieron igual cantidad de yemas. Se calcularon estadísticos descriptivos y se realizó un análisis de la varianza con el programa Infostat versión libre. Se observó que el tiempo de secado en el sistema dry on the vine fue de 50 días (año lluvioso), respecto a 20 días del sistema tradicional; el rendimiento varió de 4 a 6 kg/planta de pasas con relaciones de secado cercanas a 4:1 en ambos sistemas. La tecnología DOV representa una alternativa positiva para la provincia de San Juan, porque mantiene los rendimientos sin provocar una disminución en las reservas de la planta; si se la compara con la tecnología tradicional de secado de uvas. EEA San Juan Fil: Espíndola, Rodrigo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan. Agencia De Extensión Rural Caucete; Argentina Fil: Arevalo, Eduardo. Universidad Nacional de San Juan; Argentina
- Published
- 2020
42. [18F]DPA-714 PET imaging: a new tool to reveal the hidden part of focal drug-resistant epilepsy?
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Cheval, Margaux, Rodrigo, Sebastian, Petrescu, Ana Maria, Leroy, Claire, and Bouilleret, Viviane
- Published
- 2023
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43. Ritual and domestic activities at the el Divisadero archaeologocal site (Cafayate, Salta)
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Ledesma, Rossana Elizabeth, Villarroel, María Jimena, Rodríguez, Eduardo, and Cardozo, Rodrigo Sebastian
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purl.org/becyt/ford/6 [https] ,Historia y Arqueología ,HUMANIDADES ,DOMESTICOS ,ARTE RUPESTRE ,NOROESTE ARGENTINO ,purl.org/becyt/ford/6.1 [https] ,RITUAL ,Arqueología - Abstract
En el sitio arqueológico El Divisadero se han registrado ocupaciones prehispánicas desde el Período Formativo hasta Hispano Indígena, con evidencias de arte rupestre, arquitectura residencial, agricultura y metalurgia. El objetivo de este trabajo es examinar las dificultades teóricas y metodológicas para diferenciar las actividades rituales de las cotidianas realizadas a partir del 1.000 DC. Para ello se discuten los conceptos y metodologías de análisis vinculados a la ritualidad y la cotidianeidad, como así también se proponen los indicadores y evidencias esperables de estas acciones del pasado en el registro arqueológico. Se contrastan los resultados obtenidos en prospección, excavación, registro del arte rupestre, análisis físico-químicos y relevamiento de la arquitectura remanente en superficie. In the El Divisadero archaeological site, pre-Hispanic occupations have been registered ranging from the Formative to HispanicIndigenous Period, with evidence of rock art, residential architecture, agriculture and metallurgy. The aim of this paper is to examine the theoretical and methodological implications in discerning ritual activities from the daily ones carried out since 1000 AD. To this end, the concepts and methodologies of analysis linked to rituality and everyday life are discussed, as well as the indicators and evidences from the archaeological record. The results obtained in prospecting work, excavation, registration of rock art, physical-chemical analysis and survey of the remaining architecture on the surface are contrasted. Fil: Ledesma, Rossana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina Fil: Villarroel, María Jimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina Fil: Rodríguez, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina Fil: Cardozo, Rodrigo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentina
- Published
- 2019
44. Efecto de la agriculturización sobre la calidad biológica del suelo
- Author
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Serri, Dannae Lilia, Boccolini, Monica Fabiola, Oberto, Rodrigo Sebastian, Chavarria, Diego, Bustos, Ana Natalia, Vettorello, Cecilia, Apezteguía, Hernán, Miranda, Julio, Alvarez, Carolina, Galarza, Carlos Martin, Chiófalo, Sergio, Manrique, Marcela, Sueldo, Romina, Fernandez Belmonte, María Cecilia, Mattalia, Laura, Cholaky, Carmen, and Vargas Gil, Silvina
- Subjects
Carbon Sequestration ,Soil Microorganisms ,Agriculture (General) ,Argentina ,sustentabilidad ,Plant culture ,carbono orgánico ,Actividad Microbiana ,Carbono Orgánico ,Microbial Activity ,S1-972 ,SB1-1110 ,Organic Carbon ,Sustainability ,Soil Organic Carbon ,Microorganismos del Suelo ,Carbono Orgánico del Suelo ,Biodegradation ,Actividad microbiana ,Sustentabilidad - Abstract
En la región Pampeana Argentina, la simplificación de los agroecosistemas ha ocasionado la disminución de los servicios ecosistémicos, resultando en la pérdida de recursos, y afectando la calidad del suelo. Nuestro objetivo fue evaluar el efecto de la agriculturización en diferentes ambientes (subhúmedos y semiáridos) de la región Pampeana, mediante indicadores biológicos y el carbono orgánico edáfico. Durante 2013, 2014 y 2015, se evaluaron sitios correspondientes a las localidades de Río Cuarto, Rafael García, Manfredi y Marcos Juárez de la provincia de Córdoba, y un sitio en Villa Mercedes provincia de San Luis. En cada localidad se realizó un muestreo de suelo en un sitio de referencia y en diferentes secuencias de cultivos. Los parámetros evaluados fueron carbono de biomasa microbiana (CBM), respiración microbiana (RM), coeficiente metabólico (qCO2), actividades enzimáticas de hidrólisis del diacetato de fluoresceína (FDA), fosfatasa ácida (FA) y deshidrogenasa (DHG), carbono orgánico total (COT) del suelo y coeficiente microbiano (qMic). Los resultados obtenidos expresaron que las variables más relevantes para actuar como indicadores de calidad de suelo fueron CBM y COT, junto a las enzimas FDA y FA, ya que registraron en la mayoría de los sitios diferencias significativas entre tratamientos. En general esos indicadores permitieron diferenciar los suelos de monte nativo respecto de los de uso antrópico. A su vez, los valores obtenidos mediante la aplicación del índice de calidad de suelos fueron significativamente mayores en las situaciones naturales, sin observarse diferencias entre las secuencias de cultivos. In the Pampas region of Argentina, the simplification of agroecosystems has caused the decrease of ecosystem services, resulting in the loss of resources, and affecting soil quality. Our objective was to evaluate the effect of agriculturization in different environments (sub-humid and semi-arid) of the Pampean region, by means of biological indicators and soil organic carbon. During 2013, 2014 and 2015, sites in Río Cuarto, Rafael García, Manfredi and Marcos Juárez of the province of Córdoba, and Villa Mercedes corresponding to the province of San Luis were evaluated. At each location, soil sampling was carried out at a reference site and in different crop sequences. The parameters evaluated were microbial biomass carbon (CBM), microbial respiration (RM), metabolic coefficient (qCO2), enzymatic activities of fluorescein diacetate hydrolysis (FDA), acid phosphatase (FA) and dehydrogenase (DHG), total organic carbon (COT) soil and microbial coefficient (qMic). The obtained results expressed that the most significant indicators were CBM and COT, together with the enzymes FDA and FA since they registered significant differences between treatments at most sites. In general, these indicators allowed differentiating pristine soils from those with anthropic use. In turn, the differences between soil quality indexes were significant and higher for natural situations, with no differences between crop sequences. Instituto de Patología Vegetal Fil: Serri, Dannae Lilia. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro de Investigaciones Agropecuarias (CIAP). Instituto de Patología Vegetal (IPAVE). Córdoba; Argentina Fil: Boccolini, Monica Fabiola. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez. Marcos Juárez, Córdoba; Argentina Fil: Oberto, Rodrigo Sebastián. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro de Investigaciones Agropecuarias (CIAP). Instituto de Patología Vegetal (IPAVE). Córdoba; Argentina Fil: Chavarría, Diego. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro de Investigaciones Agropecuarias (CIAP). Instituto de Patología Vegetal (IPAVE). Córdoba; Argentina Fil: Bustos, Ana Natalia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi. Manfredi, Córdoba; Argentina Fil: Vettorello, Cecilia. Universidad Nacional de Córdoba (UNC). Facultad de Ciencias Agropecuarias (FCA). Córdoba; Argentina Fil: Apezteguía, Hernán. Universidad Nacional de Córdoba (UNC). Facultad de Ciencias Agropecuarias (FCA). Córdoba; Argentina Fil: Miranda, Julio. Universidad Nacional de Córdoba (UNC). Facultad de Ciencias Agropecuarias (FCA). Córdoba; Argentina Fil: Alvarez, Carolina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi. Manfredi, Córdoba; Argentina Fil: Galarza, Carlos Martin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez. Marcos Juárez, Córdoba; Argentina Fil: Chiófalo, Sergio. Universidad Nacional de San Luis (UNSL). Facultad de Ingeniería y Ciencias Agropecuarias ( FICA). San Luis; Argentina Fil: Manrique, Marcela. Universidad Nacional de San Luis (UNSL). Facultad de Ingeniería y Ciencias Agropecuarias ( FICA). San Luis; Argentina Fil: Sueldo, Romina. Universidad Nacional de San Luis (UNSL). Facultad de Ingeniería y Ciencias Agropecuarias ( FICA). San Luis; Argentina Fil: Fernandez Belmonte, María Cecilia. Universidad Nacional de San Luis (UNSL). Facultad de Ingeniería y Ciencias Agropecuarias ( FICA). San Luis; Argentina Fil: Mattalia, Laura. Universidad Nacional de Río Cuarto (UNRC). Facultad de Agronomía y Veterinaria (FAV). Rio Cuarto, Córdoba; Argentina Fil: Cholaky, Carmen. Universidad Nacional de Río Cuarto (UNRC). Facultad de Agronomía y Veterinaria (FAV). Rio Cuarto, Córdoba; Argentina Fil: Vargas Gil, Silvina. Instituto Nacional de Tecnología Agropecuaria (INTA). Centro de Investigaciones Agropecuarias (CIAP). Instituto de Patología Vegetal (IPAVE). Córdoba; Argentina Fil: Chavarría, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Córdoba; Argentina Fil: Vargas Gil, Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Córdoba; Argentina
- Published
- 2018
45. Diffusion tensor imaging of partial intractable epilepsy
- Author
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Dumas de la Roque, Anne, Oppenheim, Catherine, Chassoux, Francine, Rodrigo, Sebastian, Beuvon, Frédéric, Daumas-Duport, Catherine, Devaux, Bertrand, and Meder, Jean-François
- Published
- 2005
- Full Text
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46. CO 2 ‐water‐rock interactions in undeformed and sheared claystone caprocks from Northern Europe
- Author
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Vernooij, Roland, primary, Siqueira, Tiago de Abreu, additional, Hangx, Suzanne, additional, Spiers, Christopher, additional, Ketzer, Marcelo, additional, and Iglesias, Rodrigo Sebastian, additional
- Published
- 2020
- Full Text
- View/download PDF
47. Diffusion tensor imaging in early Alzheimer's disease
- Author
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Naggara, Olivier, Oppenheim, Catherine, Rieu, Dorothée, Raoux, Nadine, Rodrigo, Sebastian, Dalla Barba, Gianfranco, and Meder, Jean-François
- Published
- 2006
- Full Text
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48. Relaciones óptimas de uso de mano de obra en la producción de uva de mesa de San Juan para diferentes niveles de agregación de capital
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Espindola, Rodrigo Sebastian, Miranda, Omar Alberto, Battistella, Maximiliano, and Gennari, Alejandro
- Subjects
productividad ,Uvas de Mesa ,Productividad ,Labour ,Mano de Obra ,Agriculture (General) ,Production ,Agriculture ,San Juan ,trabajo ,Producción ,Manpower ,S1-972 ,Trabajo ,bienes de uso ,Dessert Grapes ,Productivity - Abstract
La falta de mano de obra en explotaciones conduce a investigar qué cantidad de este factor se emplea en relación con el capital que todo empresario invierte. Los objetivos del trabajo fueron medir el activo corriente y no corriente de las fincas productoras de uva de mesa, encontrar valores óptimos de uso de personal en relación con el activo y calcular la productividad media y marginal de la mano de obra para tres estratos. Para esto se deben describir los activos que se emplean en diferentes niveles o estratos productivos de uva de mesa, calcular valores de productividad media y marginal de la mano de obra para diferentes escalas y encontrar las variables que mayor influencia tienen sobre el beneficio económico de las empresas. Se utilizó una fórmula para el cálculo de tamaño de muestra (n = 56). Se construyeron tres estratos de estudio (1 = 5 ha; 2 = 5-25 ha y 3 = > 25 ha). Se realizaron entrevistas estructuradas con variables referidas a activos corrientes y no corrientes. Se calcularon estadísticas descriptivas, análisis de frecuencias, escalamiento óptimo y regresión lineal. Además, se calculó la productividad media y marginal para la mano de obra permanente y temporal. La desviación estándar del valor de la tierra es de $ 4.217.370, con antigüedades máximas de plantación de 74 años. Existen 1,2 galpones por propiedad y desde 0,5 (estrato 1) hasta 3,4 (estrato 3) tractores por propiedad, con una antigüedad máxima de 35 años. El uso de personal permanente es 5,76 veces mayor en estrato 3 que en 1. Existe desde 1,3 a 7,5 personal permanente por propiedad. El estrato 3 consume 90% más de jornales que 1 y 2. En la muestra se contrata personal permanente cada 5 ha. Con más de 13 empleados permanentes se registra una caída en la productividad marginal. De 1 a 7 trabajadores permanentes la productividad media del trabajo decrece. Se concluye que mayores relaciones de capital se relacionan con mayor ingreso. Los bienes de uso generan mayor contribución al ingreso que el factor trabajo. Las propiedades de 5 a 25 ha son las más eficientes en cuanto a uso de personal. Las explotaciones pequeñas realizan un manejo comercial del producto. La productividad marginal de la mano tiene una tendencia decreciente. The lack of labor on farms leads to the investigation of the relationship between the workers employed, the workers needed and the capital investment. The objectives of this paper are measured the current and no current asset of table grape farms, find optimal values of use of personnel in relation to the asset used and calculate the average means and labor margin for three strata. To do this, the assets needed, in different production levels must be describe; also marginal and average productivity values of labor must be calculated for different production levels; the variables that mostly affect the profit of companies must be found. A formula to calculated the sample size was used (n = 56). Three study strata were used (1 < 5 ha; 2 5-25 ha; 3 > 25 ha). Structured interviews were carried out variables about current and non current assets. Describe statistics, frequency analysis, optimal scaling and lineal regression were performed. The average and marginal productivity were calculated for permanent and temporary labor. Excel 2013 and Infostat V.14 were employed. The standard deviation of the value of the land is $ 4.217.370 with plantations of 74 years. There are 1.2 sheds per farm and being 35 years old. Hiring permanent workers is 5.76 times higher in level 3 than in level 1. The permanent workers range is from 1.3 to 7.5 per farm. Level 3 pays 90 % more wage than level 1 and 2. In the sample 1 permanent worker is hired every 5 ha. The marginal productivity registers a fall with more than 13 permanent workers. The average productivity decrease from 1 to 7 permanent workers. In conclusion the grater the capital, the better the profit. Current assets mean generate higher revenue than labor. Farms from 5 – 25 ha are more efficient with respect to the use of workers. Small farms handle the product commercially. The marginal productivity of labor has a decresing tendency. EEA San Juan Fil: Espindola, Rodrigo Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan. Agencia de Extensión Rural Caucete; Argentina Fil: Miranda, Omar Alberto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; Argentina. Universidad Nacional de San Juan. Departamento de Agronomía; Argentina Fil: Battistella, Maximiliano. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; Argentina. Universidad Nacional de San Juan. Departamento de Agronomía; Argentina Fil: Gennari, Alejandro. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias; Argentina
- Published
- 2017
49. Language lateralization in temporal lobe epilepsy using functional MRI and probabilistic tractography
- Author
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Rodrigo, Sebastian, Oppenheim, Catherine, Chassoux, Francine, Hodel, Jérôme, de Vanssay, Aimée, Baudoin-Chial, Sonia, Devaux, Bertrand, and Meder, Jean-François
- Published
- 2008
50. Intralesional recordings and epileptogenic zone in focal polymicrogyria
- Author
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Chassoux, Francine, Landre, Elisabeth, Rodrigo, Sebastian, Beuvon, Frédéric, Turak, Baris, Semah, Franck, and Devaux, Bertrand
- Published
- 2008
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