Las trabajadoras invisibles: experiencias laborales de mujeres migrantes en Argentina Magliano, Maria Jose En base a un trabajo de campo cualitativo sostenido en el tiempo, este artículo se propone indagar en las experiencias laborales de mujeres migrantes de origen peruano en la ciudad de Córdoba (Argentina). En particular, se reconstruyen las especificidades del trabajo doméstico y del cuidado remunerado y del trabajo textil, en tanto espacios de inserción laboral donde las mujeres migrantes sudamericanas en general y peruanas en particular se encuentran sobrerrepresentadas. El texto se organiza en torno al análisis de tres dimensiones que adquirieron centralidad en el transcurso del trabajo de campo: la maternidad y las formas de organización familiar en contextos migratorios, los efectos de la inestabilidad que caracterizan a estas inserciones laborales en la vida cotidiana de las mujeres migrantes y sus familias, y los sentidos de la invisibilidad laboral en relación con las condiciones de explotación que enfrentan. El estudio de estas inserciones laborales, que se distinguen por su precariedad e informalidad, ofrece herramientas para reflexionar críticamente sobre los procesos de etnización y jerarquización laboral presentes en Argentina. En pos de pensar la articulación entre migraciones femeninas y experiencias laborales, se recuperan los aportes teóricos de las perspectivas de género e interseccional, las cuales resultan potencialmente útiles para examinar las implicancias de las clasificaciones sociales (sean de género, etnicidad, raza, clase, origen nacional) en los mercados de trabajo.; Com base em uma pesquisa de campo qualitativa e sustentada ao longo do tempo, este artigo propõe-se pesquisar as experiências do trabalho das mulheres de origem peruano na cidade de Córdoba (Argentina). Especificamente, o artigo tenta reconstruir as especificidades do trabalho doméstico, do trabalho dos cuidados ao domicílio privado e do trabalho têxtil, enquanto áreas onde as mulheres migrantes da América do Sul em geral, e peruanas em particular, se encontram sobre representadas. O texto está organizado em torno da análise de três dimensões centrais que surgiram no decorrer do trabalho de campo: a maternidade e as formas de organização familiar num contexto migratório; os efeitos da instabilidade que caracterizam estas inserções de trabalho na cotidianidade das mulheres e suas famílias; e os sentidos de invisibilidade que surgem das condições da exploração que enfrentam em seus trabalhos. O estudo destas inserções de trabalho –que se distinguem pela precariedade e informalidade–apresenta ferramentas para refletir criticamente sobre os processos de etnicização e hierarquia do trabalho na Argentina. Procurando refletir sobre a articulação entre migrações femininas e experiências do trabalho, recuperam-se contribuições teóricas das perspectivas de gênero e interseccional, potencialmente interessante para examinar as implicações das classificações sociais (sexo, etnia, raça, classe, nacionalidade) nos mercados do trabalho.

Tillage effects on labile pools of soil organic nitrogen in a semi-humid climate of Argentina: A long-term field study Martinez, Juan Manuel; Galantini, Juan Alberto; Duval, Matias Ezequiel; López, Fernando Manuel Tillage systems strongly affect nitrogen (N) mineralization. However, there is still only limited information on the relationship between N in labile soil organic matter (SOM) fractions and crop N uptake under different tillage systems in areas with poor water availability. This study discusses the long-term effect of two tillage systems on i) the N-content in labile organic matter fractions and their relationship with the N mineralization potential at three depths (0?5; 0?10 and 0?20 cm), ii) the factors that affect the N mineralization potential, and iii) the relationship between potentially mineralizable N (N0) and crop N uptake in a semi-humid climate. In a long-term experiment, a Typic Argiudoll was sampled under two contrasting tillage systems: no-tillage (NT) and conventional tillage (CT). The soil sampling was performed over four years of the crop sequence (2003, 2009, 2010 and 2011) when the plots were sown with winter wheat (Triticum aestivum L.). They were analyzed for N0 in the form of anaerobic N, soil organic nitrogen (SON), physically separated SOM fractions and crop N uptake. Higher values of SON and labile soil N fractions were observed under NT at all three depths. Significant differences in N0 were found between the tillage systems, with greater values under NT. Significant (P < 0.05) and positive correlations between N0 and fine particulate organic carbon (fPOM-C) (r ≥ 0.66) were found in CT and in NT at the three depths, whereas highly significant (P < 0.001) and negative relationships between N0 and fine particulate organic N (fPOM-N) (r ≥ −0.83) were found under both tillage systems at 0?5 and 0?10 cm. The most pronounced difference in these relationships between tillage systems was observed at the 0?5 cm soil depth. Significant correlations of N0 with residue input from previous crops and the fallow period were observed under both tillage systems and for all three depths. Regarding the relationships between N0 and wheat N uptake, no significant correlations were found for any tillage system or depth. Soil organic N fractions were shown to be strongly influenced by the residue input from the previous crop and by variable weather conditions during the fallow period. The higher content of SON fractions under NT was associated with a higher N mineralization potential, however, it did not result in increased N availability and N uptake by wheat, because of climatic conditions during the crop growing season.

A Valuable QTL for Fusarium Head Blight Resistance from Triticum turgidum L. ssp. dicoccoides Has a Stable Expression in Durum Wheat Cultivars Soresi, Daniela Soledad; Zappacosta, Diego Carlos; Garayalde, Antonio Francisco; Irigoyen, I.; Basualdo, Jessica; Carrera, A. Langdon(Dic-3A)-10 line carrying the QTL Qfhs.ndsu-3AS from T. turgidum ssp.dicoccoides that confers Type II resistance to Fusarium head blight (FHB) was crossed with Argentinean durum wheat cultivars. F4 progeny were screened with the microsatellite locus Xgwm2, tightly linked to the Qfhs.ndsu-3A region. Reaction of these plants and parents to FHB was evaluated at 7, 14 and 21 days post-inoculation (dpi) with F. graminearum; severity (% symptomatic spikelets/spike) and AUDPC (area under disease progress curve) were calculated. F4 progeny carrying the resistance allele in heterozygous or in homozygous condition showed significantly lower scab damage at 21 dpi and slower progress of disease than cultivated parents. Our results indicate that the resistance Qfhs.ndsu-3AS has a stable dominance expression in genetic backgrounds of durum cultivars and demonstrate that the linked microsatellite is an effective molecular tool for resistance screening. This work offers valuable information for Qfhs.ndsu-3AS utilization in wheat breeding programs.

Diversity and distribution of epiphytic bromeliads in a Brazilian subtropical mangrove Sousa, Mariana De; Delevati Colpo, Karine It is not unusual to find epiphytic bromeliads in mangroves, but most studies on mangrove vegetation do not record their presence. This study aimed to evaluate the diversity and distribution of epiphytic bromeliads in a subtropical mangrove. The richness, abundance and life form (atmospheric and tank) of bromeliads were recorded and compared among host tree species and waterline proximity. The effects of diameter and height of host trees on the abundance of bromeliads were also assessed. The mangrove was composed of Avicennia schaueriana, Laguncularia racemosa and Rhizophora mangle. We recorded seven bromeliad species of the genera Tillandsia and Vriesea. The waterline proximity did not affect the abundance or diversity of bromeliads, but atmospheric forms were predominant near the waterline, whereas tank bromeliads were more frequent in the interior of the mangrove. The three mangrove species hosted bromeliads, but L. racemosa was the preferred host. The species composition showed that the distribution of bromeliads is more related to the host species than to the distance from the waterline. Bromeliad abundance increased with tree size. Bromeliads can be biological indicators of ecosystem health; therefore, inventories and host tree preferences are necessary knowledge for an adequate management of sensitive ecosystems as mangroves.

Influence of bottleneck lengths and position on simulated pedestrian egress Parisi, Daniel Ricardo; Patterson, Germán Agustín In this paper, the problem of pedestrian egress under different geometries is studied by means of two numerical models. The length of the bottleneck after the exit and the distance of the exit to the lateral wall of a squared room are investigated. Both models show that an increase in the bottleneck length increases the evacuation time by more than 20%, for any exit position. Hence, a bottleneck length tending to zero is the best choice. On the contrary, the results of moving the exit closer to the lateral wall are different in both models and, thus, its convenience cannot be stated. To unveil whether this layout modification is favorable, experimental data are required. Moreover, the discrep- ancy between models indicates that they should be validated considering several scenarios.

Phylogenetic relationships of Hydnum peroxydatum support the synonymy of Hydnochaete with Hymenochaete (Hymenochaetaceae, Agaricomycetes) Baltazar, Juliano; Pildain, María Belén; Gorjón, Sergio P.; Silveira, Rosa Mara Borges Da; Rajchenberg, Mario A combined dataset of rDNA ITS and LSU sequences was used to infer the phylogenetic relationships of Hydnochaete peroxydata (≡ Hydnum peroxydatum), the type species of Hydnochaete. The species was retrieved nested within the Hymenochaete s. str. clade; therefore Hydnochaete is regarded as a synonym of Hymenochaete and the new combination Hymenochaete peroxydata is proposed.

Probing the catalytic activity of sulfate-derived Pristine and post-treated porous TiO2(101) anatase mesocrystals by the oxidative desulfurization of dibenzothiophenes Rivoira, Lorena Paola; Martinez, Maria Laura; Falcon, Horacio; Beltramone, Andrea Raquel; Campos-Martin, Jose M.; García Fierro, José Luis; Tartaj, Pedro Mesocrystals (basically nanostructures showing alignment of nanocrystals well beyond crystal size) are attracting considerable attention for modeling and optimization of functionalities. However, for surface-driven applications (heterogeneous catalysis), only those mesocrystals with excellent textural properties are expected to fulfill their potential. This is especially true for oxidative desulfuration of dibenzothiophenes (hard to desulfurize organosulfur compounds found in fossil fuels). Here, we probe the catalytic activity of anatases for the oxidative desulfuration of dibenzothiophenes under atmospheric pressure and mild temperatures. Specifically, for this study, we have taken advantage of the high stability of the (101) anatase surface to obtain a variety of uniform colloidal mesocrystals (approximately 50 nm) with adequate orientational order and good textural properties (pores around 3-4 nm and surface areas around 200 m2/g). Ultimately, this stability has allowed us to compare the catalytic activity of anatases that expose a high number of aligned single crystal-like surfaces while differing in controllable surface characteristics. Thus, we have established that the type of tetrahedral coordination observed in these anatase mesocrystals is not essential for oxidative desulfuration and that both elimination of sulfates and good textural properties significantly improve the catalytic activity. Furthermore, the most active mesocrystals have been used to model the catalytic reaction in three-(oil-solvent-catalyst) and two-phase (solvent-catalyst) systems. Thus, we have been able to observe that the transfer of DBT from the oil to the solvent phase partially limits the oxidative process and to estimate an apparent activation energy for the oxidative desulfuration reaction of approximately 40 kJ/mol in the two-phase system to avoid mass transfer limitations. Our results clearly establish that (101) anatase mesocrystals with excellent textural properties show adequate stability to withstand several post-treatments without losing their initial mesocrystalline character and therefore could serve as models for catalytic processes different from the one studied here.

Size, angular momentum and mass for objects Anglada, Pablo Ruben; Gabach Clement, Maria Eugenia; Ortiz, Omar Eduardo We obtain a geometrical inequality involving the ADM mass, the angular momentum and the size of an ordinary, axially symmetric object. We use the monotonicity of the Geroch quasi-local energy on 2-surfaces along the inverse mean curvature flow. We also compute numerical examples to test the robustness of our hypotheses and results.

Magnetoelectric tuning of the inverse spin-Hall effect Vargas, Jose Marcelo; Gomez, Javier Enrique; Aviles Felix, Luis Steven; Butera, Alejandro Ricardo We demonstrate in this article that the magnetoelectric (ME) mechanism can be exploited to control the spin current emitted in a spin pumping experiment using moderate electric fields. Spin currents were generated at the interface of a ferromagnet/metal bilayer by driving the system to the ferromagnetic resonance condition at X-Band (9.78 GHz) with an incident power of 200 mW. The ME structure, a thin (20 nm) FePt film grown on top of a polished 011-cut single crystal lead magnesium niobate-lead titanate (PMN-PT) slab, was prepared by dc magnetron sputtering. The PMN-PT/FePt was operated in the L-T mode (longitudinal magnetized-transverse polarized). This hybrid composite showed a large ME coefficient of 140 Oe cm/kV, allowing to easily tune the ferromagnetic resonance condition with electric field strengths below 4 kV/cm. A thin layer of Pt (10 nm) was grown on top of the PMN-PT/FePt structure and was used to generate and detect the spin current by taking advantage of its large spin-orbit coupling that produces a measurable signal via the inverse spin-Hall effect. These results proved an alternative way to tune the magnetic field at which the spin current is established and consequently the inverse spin-Hall effect signal, which can promote advances in hybrid spintronic devices.

Aqueous phase hydrogenation of furfural using carbon-supported Ru and RuSn catalysts Musci, Juan José; Merlo, Andrea Beatriz; Casella, Mónica Laura The aqueous phase hydrogenation (APH) of furfural was studied over carbon-supported monometallic Ru and bimetallic RuSn catalysts at 90 °C and 1.25 MPa. Tin was added via Surface Organometallic Chemistry on Metals techniques and its effect was a function of the Sn/Ru atomic ratio. Thus, the addition of Sn in a Sn/Ru ratio of 0.4 promoted the C[dbnd]O hydrogenation reaching a selectivity towards furfuryl alcohol over 85% throughout the course of the reaction. A higher concentration of tin does not improve the situation. It seems to be a compromise between the dilution of Ru sites, active for the hydrogenation reaction, and the promoting effect of Sn. TEM, TPR and XPS characterization indicate the strong interaction between Ru and Sn in all the bimetallic catalysts. Finally, the reuse of the catalyst was analyzed.

¿Existen las generaciones políticas? Reflexiones en torno a una controversia conceptual; Do Political Generations Exist? Reflections Around a Conceptual Controversy; ¿Existem as gerações políticas? Reflexões em torno de uma polêmica conceitual Longa, Francisco Tomás La conceptualización y aplicación de la noción de “generación” ha sido objeto de múltiples debates en el campo de la teoría social contemporánea. En el presente texto, se presenta el recorrido que tuvo la utilización del concepto en el campo de la teoría social, desde sus primeras aplicaciones hasta los enfoques contemporáneos. A su vez, se da cuenta de las principales impugnaciones actuales a la utilización de esta noción, para sustentar finalmente un posicionamiento propio respecto al debate, que rescata la pertinencia del concepto de generación política para la comprensión de las dinámicas de los movimientos sociales, en función de una perspectiva amplia y comprensiva.; The conceptualization and application of the notion of "generation" have been the subject of many debates in the field of the contemporary social theory. This article presents the path that the use of the concept in the field of social theory has had, from its first applications to the contemporary approaches. At the same time, the main current challenges to the use of this notion are noted, in order to support its own positioning concerning the debate, which rescues the relevance of the concept of political generation for understanding the dynamics of social movements, in function of a broad and comprehensive perspective.; A conceituação e aplicação do conceito de "geração" tem sido muito debatida no campo da teoria social contemporânea. Neste texto, se apresenta o percurso que teve o uso do conceito no campo da teoria social, desde as suas primeiras aplicações até as abordagens contemporâneas. Em paralelo, se consideram as principais impugnações atuais à utilização desta noção para sustentar finalmente um posicionamento próprio frente ao debate, o qual resgata a pertinência do conceito de geração política para a compreensão das dinâmicas dos movimentos sociais, em função de uma perspectiva ampla e abrangente.

Are ploidy and age size-related? A comparative study on tetraploid Pleurodema kriegi and octoploid P. cordobae (Anura: Leptodactylidae) from Central Argentina Otero, Manuel Alejandro; Valetti, Julian Alonso; Bionda, Clarisa de Lourdes; Salas, Nancy Edith; Martino, Adolfo Ludovico Size differences of anuran amphibian complexes with different ploidy levels are well known, whereas the larger species usually corresponds to a lower ploidy level. Neotropical Pleurodema kriegi (tetraploid) and P. cordobae (octoploid) differ in many morphometric variables and, in all cases, the species with the higher ploidy level corresponded to an increased body size. Although sexual size dimorphism (SSD) has been tested in P. kriegi without considering age-related differences in body size, SSD in P. cordobae is unknown. Here we determined individual age in order to analyse: (1) the intraspecific pattern of SSD of both species and (2) whether a larger body size and lower ploidy level relation observed in other polyploid anuran amphibians are reversed in a tetra-octoploid complex. Age and body size (snout-vent length) were correlated in both sexes and species. When the effect of age was controlled, significant a SSD were found. Intraspecific differences in demographic parameters were significantly higher than interspecific ones. We confirmed a female-biased SSD for both species and found the first case in which the larger species corresponds to a higher ploidy level. Different ploidy levels were an important factor determining age and body size under similar environmental conditions. Skeletochronology provided basic demographic data of P. kriegi and P. cordobae which are now available for comparative and conservation studies.

“No viajes sola”: el doble feminicidio de mujeres argentinas en Ecuador; “Do not travel alone”: the double feminicide of the argentines in Ecuador Bonavitta, Paola; Bard Wigdor, Gabriela En febrero del año 2016, dos turistas argentinas fueron asesinadas en Montañita, Ecuador. El caso repercutió en Sudamérica con fuerza y engrosó la lista del creciente índice de feminicidios de la región. En Argentina, en el marco de la publicitada campaña ''Ni Una Menos'', el doble asesinato generó nuevas discusiones entre movimientos feministas, agrupaciones por los derechos humanos, medios de comunicación de diversa índole y la sociedad en general. Proponemos analizar cómo trataron el tema dos medios gráficos en particular, de tirada nacional y de líneas editoriales opuestas entre sí: La Nación y Página 12. Reconocer de qué manera se configuró el discurso sobre el caso, para analizar las posiciones que pretenden instalarse en relación a la problemática y los posibles impactos sociales a partir de la opinión pública que se difunde. Aspiramos a generar reflexiones y plantear posibles caminos a seguir, para abordar la cuestión desde una perspectiva de derechos humanos y feminista.

New records of bats (Mammalia: Chiroptera) for a southern locality of the Argentine Yungas Gamboa Alurralde, Santiago; Barquez, Ruben Marcos; Díaz, María Mónica The forests of northwestern Argentina represent one of the most diverse areas of the country, but also one of the most affected by human activities. The southern border of this region is a transition area with the Dry Chaco Ecoregion and represents a poorly studied zone. The aim of this study was to assess the diversity of bats at the village of Escaba, southern Tucuman. Seven field surveys were conducted at five different sites. A total of 120 specimens in three families and 14 species were recorded, 12 of them representing new records for the study area, increasing the species richness of Escaba from four to 16 species. The area will be recommended as an AICOM, a status given by the RELCOM, thereby promoting actions to preserve the species of bat in the area.

Pensar la lentificación de las trayectorias estudiantiles universitarias desde la reflexividad bourdiana: Un estudio sobre la Universidad Nacional de San Juan; Thinking the slowing down of student's university careers from Bourdieu's perspective: A study about The National University of San Juan Algañaraz Soria, Victor Hugo; Castillo, Gonzalo Miguel; Guevara, Hilda Mabel El artículo que aquí presentamos, si bien comparte el interés general sobre el devenir de las trayectorias de estudiantes en las instituciones universitarias de gestión estatal, abordado por un número cada vez mayor de estudiosos dedicados al tema, procura desarrollar una visión analítica productiva que permita capturar algunos rasgos de la especificidad del fenómeno en torno a una institución universitaria estatal en particular: la Universidad Nacional de San Juan. Se visibiliza así una línea de investigación que se viene consolidando en la provincia desde hace varios años, espacio académico en el que los autores de este trabajo participan como investigadores.En particular, se trata de analizar el fenómeno de ?lentificación? de las trayectorias académicas estudiantiles. Esto es, cuando el recorrido académico efectuado por los estudiantes universitarios desde su ingreso hasta su graduación o abandono, demanda un tiempo considerablemente superior a lo estipulado según los planes de estudios correspondientes a cada carrera.; Although the work presented in this paper shares the general interest in the evolution o f students' careers in state universities, an issue addressed by more and more researchers who deal with the subject, it also tries to develop an analytic and productive vision that allows to capture features o f the specific nature o f the phenomenon within a state university in particular: The National University o f San Juan. Thus, a line o f investigation is visualized, a line that has been strengthening in the province for several years, an academic space where the authors of this work take part as researchers. Particularly, it is an attempt to analyze the phenomenon o f "the slowing down" of student's university trajectories. That is when the academic itinerary chosen by university students since their admission until their graduation or their quitting, demands considerably much more time than what is established by the study plans of each career.

Alfabetización informacional. Una tarea en Facebook para explorar museos virtuales Melgar, Maria Fernanda; Chiecher, Analía Claudia; Elisondo, Romina Cecilia; Donolo, Danilo Silvio La Alfabetización Informacional implica, entre otros aspectos, el desarrollo de habilidades para aprender y desenvolverse en ambientes virtuales. La Universidad ocupa un lugar clave en la formación integral de los profesionales, incluyendo la selección, uso ético, producción y comprensión de información en diferentes formatos tecnológicos. En el artículo presentamos una tarea de aprendizaje implementada con estudiantes universitarios. Dicha tarea fue resuelta en grupos (en el contexto de Facebook) y requirió la exploración de museos virtuales. Para conocer las valoraciones de los estudiantes acerca de la tarea de la que participaron se diseñó un cuestionario que fue administrado al finalizar la experiencia. Los estudiantes destacaron que la tarea les permitió aprender sobre manejo de tecnología y habilidades vinculadas al trabajo en equipo. Se mencionó como interesante que desde la Universidad se promuevan experiencias de este tipo, que permitan el uso educativo de herramientas como Facebook.; Informational Literacy involves, among other things, the development of skills to learn and develop in virtual environments. The University plays a key role in the formation of professionals, including selection, ethical use, production and understanding of in-formation technology in different formats. The article presents a learning task given to college students. This task was solving in groups (in facebook context) and required exploring virtual museums. To assess the perceptions of students about the task a questionnaire was administered at the end of the experience. Students stressed that the task allowed them to learn about technology and management skills related to teamwork. The importance of promoting from college this type of learning experiences in virtual contexts was also highlighted.

Mal de Archivo en La última cinta de Krapp, de Samuel Beckett, y en Busca del tiempo perdido, de Marcel Proust Berdaguer Rauschenberg, Nicholas Dieter Buscamos en este artículo una comparación entre En busca del tiempo perdido, de Marcel Proust, y la Última cinta de Krapp, de Samuel Beckett. A partir de la noción de “mal de archivo” de Derrida, buscamos aproximar las estrategias de archivación en juego en ambas obras. En Proust, la archivación pone el énfasis en las conquistas amorosas y juegos de seducción entre personas de clases sociales muy diferentes. De esto sale la gran tragedia de la obra: el suicidio de Albertine. Krapp usa las bobinas para archivar sus impresiones y juicios sobre hechos que apenas aparecen mencionados generando una creciente alteridad consigo mismo. ¿Jugaría la obra de Beckett una parodia con la Recherche?

Distancias cercanas y diferencias encontradas en la Ciudad de Buenos Aires: El caso de los adultos y las adultas que viven en las calles. 1997-2011 Boy, Martín Guillermo En este artículo se trabajará sobre las limitaciones que se encuentran en el campo de la Sociología Urbana para pensar el encuentro de otredades de clase que reactualizan procesos de desigualdad social. Mucho se ha escrito sobre el proceso de segregación residencial que atravesó a la Ciudad de Buenos Aires desde la profundización del neoliberalismo en la década de 1990 pero poco se dice sobre cómo la crisis social, política y económica modificó el paisaje urbano y cómo diferentes grupos de pobres reocuparon áreas centrales de la ciudad para desarrollar en el espacio urbano estrategias de supervivencia. De esta forma, se intentará reproblematizar cómo los pobres también construyen usos y significaciones de un mismo espacio céntrico; In this article, we will discuss the limitations in the field of urban sociology to ponder on the encounter of class othernesses that recreates processes of social inequality. Several authors have written about the process of residential segregation that the City of Buenos Aires went through as from the deepening of neoliberalism in the 1990s. However, I consider that academic studies have not said enough about how the social, political and economic crisis has altered the urban landscape and how different groups of poor people reoccupied central areas of the city to develop survival strategies in the urban space. In this way, I will try to think upon how adults who live in the streets also devise uses and meanings of the same downtown area.

Estimación de evapotranspiración real (ETR) y de evapotranspiración potencial (ETP) en el sudoeste bonaerense (Argentina) a partir de imágenes MODIS; Estimation of real evapotranspiration (ETR) and potential evapotranspiration (ETP) in the southwest of the Buenos Aires Province (Argentina) using MODIS images Marini, F.; Santamaría, M.; Oricchio, P; Di Bella, Carlos Marcelo; Basualdo, A Se han elaborado modelos para el cálculo de evapotranspiración real (ETR) y de evapotranspiración potencial (ETP) en base a un análisis de regresión múltiple entre dichos parámetros estimados en siete estaciones meteorológicas y dos variables derivadas de imágenes satelitales MODIS: Temperatura de Superficie (TS) e Índice Normalizado de Diferencia de Vegetación (Normalized Difference Vegetation Index -NDVI). Dichos modelos permitieron estimar ETR y ETP en el sudoeste de la provincia de Buenos Aires (Argentina) en base al análisis del período 2000/2014. Ambos fueron calibrados satisfactoriamente en cada una de las estaciones meteorológicas utilizadas. Se ajustó un modelo de regresión múltiple lineal a la variable ETR, con un coeficiente de determinación de 0,6959. En el caso de la variable ETP el modelo de regresión ajustado fue no lineal y su coeficiente de determinación de 0,8409. El análisis de regresión individual de cada una de las estaciones meteorológicas permitió explicar el comportamiento de la regresión basada en el conjunto completo de datos, tanto para la variable ETR como para la variable ETP. Los resultados refuerzan la ventaja de la teledetección en la estimación de ETR y ETP en zonas en donde no se dispone de datos meteorológicos.; Using regression analysis between actual evapotranspiration (ETR) and potential evapotranspiration (ETP) values obtained in seven meteorological observatories and remote sensing derived data from MODIS images (Surface temperature and Normalized Difference Vegetation Index - NDVI) models for estimating ETR and ETP in the southwest of the Buenos Aires Province (Argentina) were developed for the 2000–2014 period. Both models were satisfactorily evaluated in the meteorological observatories used. A regression model was adjusted for ETR with a determination coefficient of 0,6959. Regression model was nonlinear in the case of the ETP variable with a determination coefficient of 0,8409. The individual regression analysis for each meteorological observatories explicate the behavior of the re­gression for the total data set of ETR and ETP. According to these results, the utility of remote sensing in determination of ETR and ETP in areas without meteorological data was confirmed.

Natural strategies for the control of Paenibacillus larvae, the causative agent of American foulbrood in honey bees: a review Alonso Salces, Rosa Maria; Cugnata, Noelia Melina; Guaspari, Elisa; Pellegrini, María Celeste; Aubone, Inés; de Piano, Fiorella Giselle; Antunez, Karina; Fuselli, Sandra Rosa American foulbrood (AFB) is a severe bacterial disease that affects larvae of honey bees (Apis mellifera). The causative agent of AFB is the spore-forming bacteria Paenibacillus larvae. The use of antibiotics for the control of AFB has led to the appearance of resistant bacterial strains and residues in beehive products. Nowadays, antibiotics are legally banned in several countries, and the affected colonies have to be destroyed by burning the hives. Therefore, the development of alternative methods for the control and prevention of AFB is necessary. In this context, different natural strategies based on the application of essential oils, plant extracts, propolis, royal jelly, nonconventional natural molecules, bacteria, and bacteriocines, have been studied in vitro and in vivo for the prevention and control of P. larvae. The experimental data achieved from these studies are reviewed and discussed in the present review, which intend to be a starting point for future research in the field.