Depression storage and infiltration effects on overland flow depth-velocity-friction at desert conditions: Field plot results and model
Rossi, María Julieta; Ares, Jorge Oscar
Water infiltration and overland flow are relevant in considering water partition among plant life forms, the sustainability of vegetation and the design of sustainable hydrological models and management. In arid and semi-arid regions, these processes present characteristic trends imposed by the prevailing physical conditions of the upper soil as evolved under water-limited climate. A set of plot-scale field experiments at the semi-arid Patagonian Monte (Argentina) were performed in order to estimate the effect of depression storage areas and infiltration rates on depths, velocities and friction of overland flows. The micro-relief of undisturbed field plots was characterized at z-scale 1 mm through close-range stereo-photogrammetry and geo-statistical tools. The overland flow areas produced by controlled water inflows were video-recorded and the flow velocities were measured with image processing software. Antecedent and post-inflow moisture were measured, and texture, bulk density and physical properties of the upper soil were estimated based on soil core analyses. Field data were used to calibrate a physically-based, mass balanced, time explicit model of infiltration and overland flows. Modelling results reproduced the time series of observed flow areas, velocities and infiltration depths. Estimates of hydrodynamic parameters of overland flow (Reynolds-Froude numbers) are informed. To our knowledge, the study here presented is novel in combining several aspects that previous studies do not address simultaneously: (1) overland flow and infiltration parameters were obtained in undisturbed field conditions; (2) field measurements of overland flow movement were coupled to a detailed analysis of soil microtopography at 1 mm depth scale; (3) the effect of depression storage areas in infiltration rates and depth-velocity friction of overland flows is addressed. Relevance of the results to other similar desert areas is justified by the accompanying biogeography analysis of similarity of the environment where this study was performed with other desert areas of the world.
Kelp gulls attack Southern right whales: a conservation concern?
Fazio, Ana; Bertellotti, Néstor Marcelo; Villanueva, María Cecilia
Kelp gulls (Larus dominicanus) feed on pieces of skin and blubber they rip from Southern right whales’ (Eubalaena australis) backs in their breeding areas at Península Valdés, Argentina, producing injuries. This behavior has increased since the first record in 1972, and some authors have suggested that constant gull harassment could have a negative effect on right whale population. The main goal of this study is to assess the variables that most affect the gull attacks. We analyzed 5359 whale-watching sightings made during trips from Puerto Pirámides (42º34′S, 64º16′W) along the whale breeding seasons (June–December) 2005 to 2007. The most important factors affecting the attacks include the presence of a mother–calf pair, the time within the season, the distance to the coast and the wind velocity. There is also concern of possible transmission of infectious diseases in the attacks since increasing number of whales with different patterns of skin lesions have been observed.
Degradation of PsbO by the Deg Protease HhoA Is Thioredoxin Dependent
Roberts, Irma; Tam Lam, Xuan; Miranda, Helder; Kieselbach, Thomas; Funk, Christiane
The widely distributed members of the Deg/HtrA protease family play an important role in the proteolysis of misfolded and damaged proteins. Here we show that the Deg protease rHhoA is able to degrade PsbO, the extrinsic protein of the Photosystem II (PSII) oxygen-evolving complex in Synechocystis sp. PCC 6803 and in spinach. PsbO is known to be stable in its oxidized form, but after reduction by thioredoxin it became a substrate for recombinant HhoA (rHhoA). rHhoA cleaved reduced eukaryotic (specifically, spinach) PsbO at defined sites and created distinct PsbO fragments that were not further degraded. As for the corresponding prokaryotic substrate (reduced PsbO of Synechocystis sp. PCC 6803), no PsbO fragments were observed. Assembly to PSII protected PsbO from degradation. For Synechocystis sp. PCC 6803, our results show that HhoA, HhoB, and HtrA are localized in the periplasma and/or at the thylakoid membrane. In agreement with the idea that PsbO could be a physiological substrate for Deg proteases, part of the cellular fraction of the three Deg proteases of Synechocystis sp. PCC 6803 (HhoA, HhoB, and HtrA) was detected in the PSII-enriched membrane fraction.
Effect of the support on the catalytic stability of Rh formulations for the water-gas shift reaction
Cornaglia, Carolina Andrea; Múnera Agudelo, John Fernando; Cornaglia, Laura Maria; Lombardo, Eduardo Agustin; Ruiz, Patricio; Karelovic, Alejandro
The stability of Rh(0.6)/La 2O 3 and Rh(0.6)/La 2O 3(27)·SiO 2 catalysts used in the water-gas shift reaction (WGSR) was studied. In order to understand the different behavior of the two formulations, XRD, Raman spectroscopy and operando-DRIFTS were employed. It was demonstrated that Rh/La 2O 3·SiO 2 showed a constant activity after 50 h on stream and that it was made up of La 2Si 2O 7 with very low crystallinity and SiO 2. On the other hand, Rh/La 2O 3 after use evolved to a mixture of oxycarbonates and lanthanum hydroxide evidenced by XRD and confirmed by Raman spectroscopy. This solid suffered a significant deactivation which was assigned to the formation of very small amounts of formate and carbonate residues. These residues disappeared after being burnt in air at 673 K and the initial catalytic activity was restored. The results obtained were useful to explain the reasons for the different stability of the two formulations and could have implications for the design of active catalysts used in the WGSR and in the processes in which it is involved.
PdAgAu alloy with high resistance to corrosion by H2S
Braun, Fernando; Miller, James; Gellman, Andrew J; Tarditi, Ana Maria; Fleutot, Benoit; Kondratyuk, Petro; Cornaglia, Laura Maria
PdAgAu alloy films were prepared on porous stainless steel supports by sequential electroless deposition. Two specific compositions, Pd83Ag2Au15 and Pd74Ag14Au12, were studied for their sulfur tolerance. The alloys and a reference Pd foil were exposed to 1000H2S/H2 at 623 K for periods of 3 and 30 h. The microstructure, morphology and bulk composition of both non-exposed and H2S-exposed samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). XRD and SEM analysis revealed time-dependent growth of a bulk Pd4S phase on the Pd foil during H2S exposure. In contrast, the PdAgAu ternary alloys displayed the same FCC structure before and after H2S exposure. In agreement with the XRD and SEM results, sulfur was not detected in the bulk of either ternary alloy samples by EDS, even after 30 h of H2S exposure. X-ray photoelectron spectroscopy (XPS) depth profiles were acquired for both PdAgAu alloys after 3 and 30 h of exposure to characterize sulfur contamination near their surfaces. Very low S 2p and S 2s XPS signals were observed at the top-surfaces of the PdAgAu alloys, and those signals disappeared before the etch depth reached ∼10 nm, even for samples exposed to H2S for 30 h. The depth profile analyses also revealed silver and gold segregation to the surface of the alloys; preferential location of Au on the alloys surface may be related to their resistance to bulk sulfide formation. In preliminary tests, a PdAgAu alloy membrane displayed higher initial H2 permeability than a similarly prepared pure Pd sample and, consistent with resistance to bulk sulfide formation, lower permeability loss in H2S than pure Pd.
Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana
Dahlquist, Juan Andrés; Pankhusrt, Robert J.; Gaschnig, Richard M.; Rapela, Carlos Washington; Casquet, César Martín; Alasino, Pablo Horacio; Galindo, Carmen; Baldo, Edgardo Gaspar Agustín
We report the first study integrating in situ U–Pb and Hf isotope data from magmatic zircon and whole-rock Sm–Nd isotope data for granitic rocks of the Sierras Pampeanas, Argentina, in order to evaluate the Palaeozoic growth of the proto-Andean margin of Gondwana. Early–Middle Ordovician granitic magmatism is by far the most voluminous of the Sierras Pampeanas and represents the most significant magmatic event. These calc-alkaline granitoids were intruded at an active continental margin. εHft values range from − 3.3 to − 14.7 and εNdt from − 3.3 to − 6.3 (t = 473 Ma), with average TDM Hf and TDM Nd ranging from 1.5 to 2.2 Ga and 1.4 to 1.7 Ga, respectively. Middle–Late Devonian magmatism occurred in the foreland, away from the orogenic front in the west, and included F-U-REE rich A-type granites. The Achala granite, the largest batholith in the Sierras Pampeanas, has εHft and εNdt values ranging from − 3.6 to − 5.8 and − 4.0 to − 6.5, respectively (t = 369 Ma). Small scattered Early Carboniferous A-type granite plutons were intruded in a dominantly extensional setting and have εHft and εNdt values ranging from − 6.7 to + 2.2 and − 0.5 to − 3.6, respectively (t = 341 Ma). The generation of Ordovician and Devonian magmas dominantly involved crustal reworking and stabilization rather than the formation of new continental crust by juvenile material accretion, whereas Carboniferous magmatism resulted in part from reworking of supracrustal material, but with variable addition of juvenile magmas.
Experimental results applying second order sliding mode control to a PEM fuel cell based system
Kunusch, Cristian; Puleston, Pablo Federico; Mayosky, Miguel Angel; Fridman, Leonid
A robust control solution is proposed to solve the air supply control problem in autonomous polymer electrolyte membrane fuel cells (PEMFC) based systems. A Super Twisting controller is designed using a nonlinear model of a laboratory fuel cell test station, even a Lyapunov based stability discussion is included. Subsequently, the proposed control strategy is successfully implemented in the laboratory test bench. Highly satisfactory results are obtained, regarding dynamic behaviour, oxygen stoichiometry regulation and robustness against uncertainty.
Approaches to homozygosity mapping and exome sequencing for the identification of novel types of CDG
Matthij, Gert; Rymen, Daisy; Bistue Millon, Maria Beatriz; Souche, Erika; Race, Valérie
In the past decade, the identification of most genes involved in Congenital Disorders of Glycosylation (CDG) (type I) was achieved by a combination of biochemical, cell biological and glycobiological investigations. This has been truly successful for CDG-I, because the candidate genes could be selected on the basis of the homology of the synthetic pathway of the dolichol linked oligosaccharide in human and yeast. On the contrary, only a few CDG-II defects were elucidated, be it that some of the discoveries represent wonderful breakthroughs, like e.g, the identification of the COG defects. In general, many rare genetic defects have been identified by positional cloning. However, only a few types of CDG have effectively been elucidated by linkage analysis and so-called reverse genetics. The reason is that the families were relatively small and could—except for CDG-PMM2— not be pooled for analysis. Hence, a large number of CDG cases has long remained unsolved because the search for the culprit gene was very laborious, due to the heterogeneous phenotype and the myriad of candidate defects. This has changed when homozygosity mapping came of age, because it could be applied to small (consanguineous) families. Many novel CDG genes have been discovered in this way. But the best has yet to come: what we are currently witnessing, is an explosion of novel CDG defects, thanks to exome sequencing: seven novel types were published over a period of only two years. It is expected that exome sequencing will soon become a diagnostic tool, that will continuously uncover new facets of this fascinating group of diseases.
Differential expression of distinct soybean resistance genes interacting with Argentinean isolates of Diaporthe phaseolorum var. meridionalis
Chiesa, Maria Amalia; Pioli, Rosanna Nora; Cambursano, Mariana Virginia; Morandi, Eligio Natalio
Soybean Stem Canker (SSC), caused by Diaporthe phaseolorum var. meridionalis (Dpm), is an important disease of soybean in Argentina. There are five known dominant genes that confer resistance to SSC, Rdm1 to Rdm5. Particularly, Rdm2 was identified in cv. Tracy-M and then it was stabilized in the breeding line T2. The Rdm4 gene was first identified in cv. Hutcheson. More recently it was found that this gene was linked to the Rdm5 gene, defining the Rdm4-5 resistance region in Hutcheson. The objective of this work was to analyze the behaviour of the dominant Rdm2, Rdm4 and Rdm5 genes interacting with the CE109 and CE112 local physiological races of Dpm, in different susceptible backgrounds (genotypes RA702 and J77-339). Rdm4 and Rdm5 segregated phenotypically as completely dominant genes in the specific interactions with the CE109 and CE112 isolates, respectively, in both susceptible backgrounds. Similarly, Rdm2 segregated as expected for a complete dominant gene in the specific interaction with the CE109 isolate, in both susceptible backgrounds. However, when interacting with the CE112 isolate, the Rdm2 gene did not segregate as expected for a completely dominant gene, neither in RA702 nor in J77-339 susceptible background. The distorted segregation of the Rdm2 gene was due to incomplete penetrance. To the best of our knowledge this is the first report documenting changes in the degree of penetrance of a soybean resistance gene (Rdm2) depending upon the physiological race of Dpm which interacts with and the genetic background in which the Rdm gene is being expressed.
CD200-CD200R1 interaction contributes to neuroprotective effects of anandamide on experimentally induced inflammation
Hernangómez, Miriam; Mestre, Leyre; Correa, Fernando Gabriel; Loría, Frida; Mecha, Miriam; Iñigo, Paula M.; Docagne, Fabian; Williams, Richard O.; Borrell, Jorge; Guaza, Carmen
The endocannabinoid anandamide (AEA) is released by macrophages and microglia on pathological neuroinflammatory conditions such as multiple sclerosis (MS). CD200 is a membrane glycoprotein expressed in neurons that suppresses immune activity via its receptor (CD200R) mainly located in macrophages/microglia. CD200-CD200R interactions contribute to the brain immune privileged status. In this study, we show that AEA protects neurons from microglia-induced neurotoxicity via CD200-CD200R interaction. AEA increases the expression of CD200R1 in LPS/IFN-γ activated microglia through the activation of CB2 receptors. The neuroprotective effect of AEA disappears when microglial cells derive from CD200R1−/− mice. We also show that engagement of CD200R1 by CD200Fc decreased the production of the proinflammatory cytokines IL-1β and IL-6, but increased IL-10 in activated microglia. In the chronic phases of Theiler's virus-induced demyelinating disease (TMEV-IDD) the expression of CD200 and CD200R1 was reduced in the spinal cord. AEA-treated animals up-regulated the expression of CD200 and CD200R1, restoring levels found in sham animals together with increased expression of IL-10 and reduced expression of IL-1β and IL-6. Treated animals also improved their motor behavior. Because AEA up-regulated the expression of CD200R1 in microglia, but failed to enhance CD200 in neurons we suggest that AEA-induced up-regulation of CD200 in TMEV-IDD is likely due to IL-10 as this cytokine increases CD200 in neurons. Our findings provide a new mechanism of action of AEA to limit immune response in the inflamed brain.
Cisplatin inhibits testosterone synthesis by a mechanism that includes the action of reactive oxygen species (ROS) at the level of P450scc
Mori Sequeiros, María de Las Mercedes; Acquier, Andrea Beatriz; Suárez, Guadalupe Verónica; Gómez, Natalia; Gorostizaga, Alejandra Beatriz; Mendez, Carlos Fernando; Paz, Cristina del Valle
Cisplatin (Cs) is a chemotherapeutic agent able to generate reactive oxygen species (ROS) which are linked to several side effects of the drug. Even when it is known that Cs produces Leydig cell dysfunction, it is unknown whether this particular side effect is mediated by ROS. The aim of this study was to evaluate the in vitro effects of Cs on testosterone production and the participation of ROS in this effect. We demonstrate that Cs promotes the generation of ROS in a time-, and concentration-dependent fashion, not only in mouse testicular interstitial cells but also in MA-10 Leydig cells. Also, Cs inhibits testosterone synthesis in a concentration-dependent fashion (5–50 μM for 4 h) and to a similar extent, in cells exposed to human chorionic gondadotropin hormone (hCG), to an analog of the second messenger cAMP (8Br-cAMP) or to a freely diffusible cholesterol analog (22R-hydroxycholesterol). However, this treatment does not inhibit the conversion of pregnenolone to testosterone. These data suggest that Cs exerts its inhibitory action on testosterone synthesis by an action at the level of P450scc. We also demonstrated that an antioxidant impairs the inhibitory effect of Cs on the conversion of the cholesterol analog into pregnenolone and that Cs does not change the expression level of P450scc mRNA. Therefore, it is concluded that Cs inhibits testosterone synthesis by a mechanism that includes the inhibition of P450scc by ROS.
¿Intensificación? En el aprovechamiento de aves entre los cazadores-recolectores-pescadores de la región del canal Beagle
Tivoli, Angelica Montserrat
Se discute aquí el carácter de los procesos de cambio relativos al aprovechamiento de aves en la región del canal Beagle que tuvieron lugar en momentos recientes de la secuencia de ocupación (a partir de aproximadamente 1500 años AP). Se ha señalado la existencia de un proceso de intensificación vinculado a la pesca hacia momentos tardíos, mientras que con respecto a la explotación de aves se halló una reorientación en su aprovisionamiento para el mismo período, caracterizada por tres factores principales: aumento proporcional de los restos de aves frente a otros recursos de mayor rédito calórico, formación de conjuntos con presencia casi exclusiva de restos de cormoranes en sitios con emplazamientos particulares y el incremento en la utilización de aves pelágicas (en particular Procellariiformes). En este trabajo se analiza si estas tendencias de cambio en la explotación de aves pueden o no entenderse como parte de una reorganización de la subsistencia más amplia, orientada hacia la intensificación en la captura de ciertos recursos.; We discuss here the nature of the processes of change concerning the use of birds in the region of the Beagle Channel, which took place in recent times of the prehistoric sequence of occupation (from about 1500 years BP). It is pointed out the existence of an intensification process linked to fishing in late moments. Meanwhile, with respect to the use of birds, variations have been found for the same period, characterized by three main factors: proportional increase of bird remains compared to other resources of higher return rates (e.g.: pinnipeds, guanacos); sites with almost exclusive presence of cormorants bones and the increase in the use of pelagic birds (Procellariiformes in particular). This paper examines whether these trends of change in the use of birds may or may not be understood as part of a broader reorganization of subsistence oriented towards intensification in the exploitation of certain resources.
Determination of chemical oxygen demand by a flow injection method based on microwave digestion and chromium speciation coupled to inductively coupled plasma optical emission spectrometry
Almeida, César Américo; González, Martín Germán; Mallea, Miguel Angel; Martinez, Luis Dante; Gil, Raul Andres
The present paper evaluates the applicability of a new FIA system for COD determination. The new system, flow injection microwave solid phase extraction by means of activated carbon (FI-MW-SPE), consists of a digestion circuit, placed in a home MW oven, coupled to an ICP-OES spectrophotometer. Doehlert experimental design was used to speed up the optimization of different experimental variables studied for assisted digestion methods. The method provided a high throughput of about 18 samples h−1. To assess the accuracy of analytical methods linear regression, elliptic joint confidence region (EJCR) was used. A large linear range of 2.78?850 mg O2 L−1 with an excellent detection limit of 0.94 mg O2 L−1 was obtained. The interference by high chloride concentration was studied, and values below 3000 mg Cl− ions L−1, allowed the estimation of COD load without any masking agents. COD values for various types of wastewater samples were correlated with those obtained by standard manual methods. Moreover, interferences due to matrix nature are absent; since matrix is washed out of the column before Cr (III) is eluted. This method reduces the time, reagent volume, hazardous emission, external contamination, with a good reproducibility and accuracy.
Characterization of physicochemical properties of perfluorodecanoic acid–polyquaternium cellulose hydrogel
Bierbrauer, Karina Lilian; Alasino, Roxana Valeria; Strumia, Miriam Cristina; Beltramo, Dante Miguel
We investigated the nature and stability of the interactions established between polyquaternium (PQ10) and perfluorodecanoic acid (PFDA) in terms of different variables such as composition, ionic strength, pH and temperature. The PQ10–PFDA complex formation is interpreted in view of electrostatic associations between carboxylic and quaternary amino group. The properties of the systems were characterized by rheology analysis. The adhesive properties of complex were also assessed. One of the macroscopic features of the new material formed in solution was the increase in viscosity from 6 Pa s for 1% PQ10 (MW 1.7 × 106 g mol−1) to about 1000 Pa s by the addition of enough PFDA to reach 1:0.5 ammonium:carboxylic group molar ratio. At this proportion, PQ10 and PFDA form a network structure with a maximum viscosity and storage modulus. This maximum coincides with an increased mucoadhesive work.
Caminos y paisajes en la costa del Pago Grande: sondeos en la Casa Oks, Martínez
Schavelzon Chavin, Daniel Gaston; Frazzi, Patricia; Silveira, Mario
Las excavaciones realizadas en la zona de la barranca antigua al río en donde se han conservado casi sin alteraciones, permitió encontrar un antiguo camino hecho con fragmentos de ladrillos que bajaba al río. Luego fue cubierto intencionalmente. Se analiza el tema de la prohibición de caminos que permitieran usar los terrenos realengos y los conflictos que sucitaron.
Peronismo y “socialismo nacional”: La politica de expropiaciones durante el gobierno de Miguel Ragone: El caso de -Minas de Unchimé/Altos Hornos Güemes y Frigorífico Arenales. Salta, 1973-1974; Peronismo and “socialismo nacional”: Expropiation policies during Miguel Ragone's government: The case of -Minas de Unchimé/Altos Hornos Güemes y Frigorífico Arenales. Salta, 1973-1974
Soler Carmona, Alejandra; Correa, Rubén Emilio
La memoria y los estudios históricos acerca del gobierno peronista de Miguel Ragone (1973/1974) nos remiten a un proyecto político “nacionalista” y “popular”. En ese marco se podrían inscribir diversas iniciativas de expropiación como la que se desarrolla sobre el Yacimientos de Unchimé/Altos Hornos Güemes, o el que expropiaba bienes y acciones del Frigorífico Arenales. Estas políticas podrían interpretarse como producto del “clima de época” y de los debates sobre la “vía socialista” y el “socialismo nacional”. Si bien diversos trabajos se han realizado desde esta perspectiva, es necesario indagar con mayor precisión el proceso histórico. En esta investigación nos proponemos explicar la política de expropiación del gobierno peronista salteño en el marco de un ciclo histórico más amplio que se inicia en los años sesenta y que otorga sentido a dichas políticas expropiatorias. Por otro lado, pretendemos reconstruir la trayectoria de las empresas objeto de expropiación con el fin de observar la forma en que se articulan o entraron en tensión distintos intereses. El estudio de largo plazo y el análisis de fuentes judiciales, periodísticas y gubernamentales permitirá advertir que la política de expropiación durante el gobierno de Ragone fue más bien el resultado de un conjunto de decisiones e intereses que preceden al gobierno peronista, y que con él fueron resignificadas en función de un nuevo programa político en donde el Estado encara la tarea de regular la actividad productiva, sin coartar la participación del capital privado, intentando retornar a la antigua alianza entre el estado- burguesía nacional- movimiento obrero, sin mayores pretensiones revolucionarias.; The memory and historical studies about the Peronist government of Miguel Ragone (1973/1974) refer us to a “nationalist” and “popular” political project. Expropriation initiatives as Unchimé Mines/Altos Hornos Güemes and Arenales Refrigeration could be included within this framework. These policies could be interpreted as a product of the “climate of the time” and the discussions on the “socialist road” and “national socialism”. Although several studies have been conducted from this perspective, it is necessary to investigate more precisely the historical process. In this research we propose to explain Salta’s Peronist government policy of expropriation in the context of a larger historical curve that began in the sixties and that gives meaning to these policies. Furthermore, we intend to reconstruct the trajectory of the expropriated companies in order to observe how these expropriations were articulated and how different interests came into confl ict. The long-term study and analysis of offi cial documents and press sources will shed light on the fact that the policy of expropriation under Ragone’s term was rather the result of a series of decisions and interests that precede the Peronist government. And during this government were reinterpreted according to a new political program in which the state faces the task of regulating the production activity, without restricting the participation of private capital, trying to return to the old alliance between state-bourgeois and labor movement, without revolutionary pretensions.
10 Years: Blue-throated Macaw
Berkunsky, Igor; Diaz Luque, Antonio; Kacoliris, Federico Pablo; Daniele, Gonzalo; Milpacher, Steve; Gilardi, James D.; Martin, Steve
Answering the question of “How many Blue-throated Macaws are there?” is not an easy one. Their habitat, the seasonally flooded savannah in northern Bolivia, is difficult to access and birds can be spread out over relatively large areas despite their limited distribution…
La regulación de los servicios de electricidad en Argentina y Brasil (1890-1962); Electric utility regulation in Argentina and Brazil (1890-1962)
Saes, Alexandre Macchione; Lanciotti, Norma Silvana
El artículo analiza la evolución de la regulación del sector eléctrico en Argentina y Brasil entre 1890 y 1960. Desde la instalación de las primeras usinas eléctricas a fines del siglo diecinueve hasta los años treinta, el control de las empresas concesionarias estuvo a cargo de las autoridades municipales en ambos países. No obstante, la similar estructura de los sistemas eléctricos en Argentina y en Brasil, la participación del estado en la regulación de este sector estratégico para el desarrollo económico, se produjo en diferentes coyunturas. Como resultado de la crisis de 1930, el gobierno brasileño transformó los principios jurídicos que reglamentaban la gestión de la electricidad aplicando un criterio de regulación discrecional; mientras que el estado argentino intervino una década más tarde, nacionalizando las empresas. Mediante la comparación de las trayectorias regulatorias en ambos países, se identifican las divergencias en las políticas eléctricas y su impacto en los sistemas eléctricos en los años de la segunda posguerra.; This article compares the evolution of electric utility regulation in Argentina and Brazil between 1890 and 1960. From the installation of electrical systems in the 19th century until the 1930s, electrical utility companies were controlled by the local authorities in both countries. The structure of electrical systems was similar in Argentina and Brazil, however the state regulation of electric utilities took place at different times. As a result of the 1930’s crisis, the Brazilian government introduced a new legal approach by applying a discretionary regulation. On the other hand, the Argentinean government intervened one decade later, nationalizing the companies. By comparing both regulatory trajectories, the divergences as well as the effects of each policy on the electrical utility systems in the second postward period, are identified.
