La oferta académica "virtual" de las universidades nacionales argentinas y su expansión territorial: un estudio de casos de "campus virtuales”

Desde ines de la década de 1990 en Argentina las universidades comienzan a incorporar las tecnologías de la información y la comunicación no sólo para la gestión administrativa de sus actividades, sino también para brindar propuestas educativas “virtuales”. El artículo describe la actual oferta académica “virtual” e indaga las implicancias que tiene dicha oferta en relación a su alcance en el territorio nacional. Se presenta la oferta virtual generada desde los rectorados de la totalidad de universidades nacionales según sea de pregrado, grado, posgrado o extensión al año 2008. Se estudian en particular los casos de las universidades del Litoral, del Nordeste y de Tres de Febrero. Asimismo, se indaga el caso de la Universidad de Quilmes por ser la primera universidad que desarrolla formación virtual en el país.From ends of the decade of 1990 in Argentina the universities begin to incorporate the technologies of the information and the communication not only for the administrative management of their activities, but also to offer educational "virtual" offers. The article describes the current academic "virtual" offer of the public Argentine higher education institutions and investigates the implications that the above mentioned offer has in relation to its scope in the national territory. It is presented the virtual offer generated from the presidencies of the totality of national universities as be of pregrado, degree, posgrado or extension by 2008. There are studied especially the cases of the universities of the Litoral, Nordeste and Tres de Febrero which belong to different Consejos de Planificación Regional de la Educación Superior. Likewise, the case of the University of Quilmes is investigated for being the first university that develops virtual formation in the country.Fil: Guido, Luciana Monica. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Saavedra 15. Centro de Estudios Urbanos y Regionales; ArgentinaFil: Versino, Mariana Selva. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educacion; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Saavedra 15. Centro de Estudios Urbanos y Regionales; Argentin

Shedding of host autophagic proteins from the parasitophorous vacuolar membrane of Plasmodium berghei

The hepatic stage of the malaria parasite Plasmodium is accompanied by an autophagy-mediated host response directly targeting the parasitophorous vacuolar membrane (PVM) harbouring the parasite. Removal of the PVM-associated autophagic proteins such as ubiquitin, p62, and LC3 correlates with parasite survival. Yet, it is unclear how Plasmodium avoids the deleterious effects of selective autophagy. Here we show that parasites trap host autophagic factors in the tubovesicular network (TVN), an expansion of the PVM into the host cytoplasm. In proliferating parasites, PVM-associated LC3 becomes immediately redirected into the TVN, where it accumulates distally from the parasite's replicative centre. Finally, the host factors are shed as vesicles into the host cytoplasm. This strategy may enable the parasite to balance the benefits of the enhanced host catabolic activity with the risk of being eliminated by the cell's cytosolic immune defence

HUBUNGAN EFEKTIVITAS PERPUSTAKAAN DENGAN MINAT BELAJAR SISWA PADA MATA PELAJARAN EKONOMI DI SMA NEGERI 50 JAKARTA

Penilitian ini bertujuan untuk mengetahui apakah terdapat hubungan efektivitas perpustakaan dengan minat belajar pada kelas ekonomi di SMA Negeri 50 Jakarta. Penelitian ini dilakukan selama tiga bulan terhitung mulai bulan mei sampai bulan juni 2013. Metode penelitian yang digunakan adalah metode survey korelasi dengan pendekatan koresaional. Teknik pengambilan sampel dalam penelitian ini dalah eknik secara propotional random sampling. Dalam hipotesis penelitian ini terdapat hubungan positif antara efektivitas perpustakaan dengan minat belajar, Makin tinggi eketivitas perpustakaan maka semakin tinggi pula minat belajar siswa. Hipotesis tersebut di uji dengan menggunakan uji analisis korelasi product moment dari Karl Pearson dan uji-t untuk mengetahui keberartian korelasi kedua variebel serta koefesien determinasi untuk mengetahui besarnya kontribusi variabel X dengan variabel Y. Hasil penelitian tersebut menyimpulkan bahwa terdapat hubungan positif anatar efektivitas perpustakaan dengan minat belajar siswa. Dengan uji koefesien determinasi atau penentu diperoleh hasil variabel minat belajar siswa (y) ditentukan oleh efektivitas perpustakaan (x)

Light Activation of the Phosphoinositide Cycle in Intrinsically Photosensitive Chicken Retinal Ganglion Cells

Purpose: In vertebrates, intrinsically photosensitive retinal ganglion cells (ipRGCs) acting as nonvisual photoreceptors transmit environmental illumination information to the brain, regulating diverse non–image-forming tasks. The phototransduction cascade in chicken ipRGCs has been shown to resemble that of rhabdomeric photoreceptors and involves phospholipase C (PLC) activation. The current work was an investigation of the participation of the phosphoinositide (PIP) cycle in this mechanism and of whether changes in activities of inositol 1,4,5-trisphosphate (IP3) and PIP kinase are triggered by light. Conclusions.: The results indicate for the first time that light stimulation of chicken RGC cultures activates the PIP cycle, causing an increase in intracellular levels of IP3, changes in levels of phosphatidic acid, PIP, and PIP2; and mobilization of Ca2+. Methods.: Primary cultures of Thy-1 immunopurified chicken embryonic RGCs were exposed to bright light pulses or kept in the dark, to assess intracellular Ca2+ mobilization by Fluo-3 AM fluorescence microscopy, IP3 levels, and enzymatic activities of diacylglycerol, phosphatidylinositol, and phosphatidylinositol phosphate kinases (DAGK, PIK, and PIPK, respectively), by radioactive assays. The presence of different melanopsins (Opn4m and Opn4x) and other photopigments was determined by RT-PCR and immunochemistry. Results.: Cultured RGCs expressing different nonvisual photopigments displayed a significant and rapid increase in IP3 levels (1.3-fold) and Ca2+ mobilization by light, which was reversed by administration of the PLC inhibitor U73122 (5 μM). Brief light pulses also caused a very rapid and transient activation of DAGK, PIK, and PIPK compared with that in the dark control.Fil: Contin, Maria Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; ArgentinaFil: Verra, Daniela Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; ArgentinaFil: Salvador, Gabriela Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Ilincheta, Monica Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Giusto, Norma Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Guido, Mario Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentin

DYNAMICS OF THE APPEARANCE THE PEST DIABROTICA VIRGIFERA VIRGIFERA, IN THE MAIZE CROPS OF NEAMŢ COUNTRY, UNDER THE CONDITIONS OF 2019

Research on the dynamics of the appearance of Diabrotica virgifera virgifera was made in the frame of a farmland cultivated with maize in Neamt county. The biological material collected using sticky yellow traps during the year 2019 from June to August. The variants and repetitions of the experience were organized according to the mode of protection of culture and according to the treatment applied, and thus resulted in three variants as follows:Variant 1 - untreated maize; Variant 2 - ground treatment with granulated insecticide FORCE G 1.5; Variant 3 - treatment of the seed with Seedoprid 600 FS.During the entire period of observation, a total of 5313 adult specimens of Diabrotica virgifera virgifera were collected, where the first alert of the adult was made on 12 June, and its last registration was on 16 August

Summer seasonal predictability of warm days in Argentina: statistical model approach

Predicting extreme temperature events can be very useful for different sectorsthat are strongly affected by their variability. The goal of this study is toanalyze the influence of the main atmospheric, oceanic, and soil moistureforcing on the occurrence of summer warm days and to predict extremetemperatures in Argentina northern of 40°S by fitting a statistical model. In apreliminary analysis, we studied trends and periodicities. Significant positivetrends, fundamentally in western Argentina, and two main periodicities ofsummer warm days were detected: 2?4 years and approximately 8 years.Lagged correlations allowed us to identify the key predictors: ElNiño-Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), andStandardized Precipitation Indices (SPI). We also noticed that the frequency ofwarm days in spring acts as a good predictor of summer warm days. Due to thecollinearity among many predictors, principal component regression was usedto simulate summer warm days. We obtained negative biases (i.e., the modeltends to underestimate the frequency of summer warm days), but the observedand simulated values of summer warm days were significantly correlated,except in northwest Argentina. Finally, we analyzed the predictability of thesummer warm days under ENSO neutral conditions, and we found newpredictors: the geopotential height gradient in 850 hPa (between the AtlanticAnticyclone and the Chaco Low) and the Atlantic Multidecadal Oscillation(AMO), while the PDO and SPI lost some relevance.Fil: Collazo, Soledad Maribel. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; ArgentinaFil: Barrucand, Mariana Graciela. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; ArgentinaFil: Rusticucci, Matilde Monica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentin

Association between El Niño and extreme temperatures in southern South America in CMIP5 models. Part 1: model evaluation in the present climate

Climate variability might temporarily improve or mitigate the effects of increasingglobal warming. Understanding and estimating internal variability is just as important as understandingthe role of anthropogenic forcing, as the combination of both drives climate events in thereal world. The objective of this work is to analyze the relationship between the SST of the equatorialPacific and 4 extreme temperature indices in southern South America considering griddedobservational data (HadEX3), reanalyses (ERA-Interim, NCEP1, NCEP2), and global climatemodels participating in the Coupled Model Intercomparison Project Phase 5 (CMIP5) in the historicalperiod 1979−2005. For this, correlations and quantile regression for the 90th percentilewere estimated between the variables. Moreover, to assess the performance of the reanalysis andCMIP5 models, multiple metrics were calculated. The observations showed that warm conditionsin the equatorial Pacific are mainly associated with a higher occurrence of warm nights in thenorth and center of Argentina and Chile in winter and spring. However, the different reanalysesconsidered in this study showed discrepancies in representing these relationships. Several CMIP5models were generally able to simulate correlation patterns for the warm extremes of the minimumand maximum temperature in comparison to HadEX3. These types of studies are critical tounderstanding whether climate models simulate temperature extremes in association with physicalprocesses, providing greater confidence in their future projections.Fil: Collazo, Soledad Maribel. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Barrucand, Mariana Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; ArgentinaFil: Rusticucci, Matilde Monica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

THE SITUATION OF THE ATTACK CAUSED BY THE LARVAE OF DIABROTICA VIRGIFERA VIRGIFERA, IN THE MAIZE CROPS OF NEAMŢ COUNTRY, UNDER CONDITIONS OF 2019

The material was collected in the corn crop belonging to the Ghiorghesti stationary, Neamt. In this periode, constant harvest was carried out between May and August 2018, by taking over biological material represented by roots and maize stalks that have been brought into the laboratory for examination and processing the data obtained. From the collected biological material, the Diabrotica virgifera virgifera specimens that have been determined and centralized have been retained.  The material was harvested on the three variants represented by untreated seed maize (V1), maize crop to which was applied the granulated soil treatment (V2) and maize crop to which was applied the seed treatment (V3). During the period of observation, were collected a number of 1951 specimens of larvae of Diabrotica virgifera virgifera. Following the centralization at variant 1 we totaled 963 specimens, at variant 2 we totaled 476secimens and at variant 3 we totaled 512 specimens

DYNAMICS OF THE APPEARANCE THE DIABROTICA VIRGIFERA VIRGIFERA, IN THE CORN CROPS OF NEAMŢ COUNTY, UNDER THE CONDITIONS OF 2020 IN DIFFEREND TILLAGE SYSTEM

In order to establish the optimal moment of carrying out the treatments for the control of the adults, the dynamics of the appearance for Diabrotica virgifera virgifera is very important step in warning of treatments and their effectiveness.The research was carried out, in the corn cultivars from Neamt County. The biological material collected using sticky yellow traps during the year 2020 from June to September.The experience and randomization were organized according to the mode of protection of culture and according to the treatment applied, and thus resulted in three variants as follows three variants : variant 1 - no tillage work system, variant 2, minimum tillage work system and variant 3 , conventional tillage work system. In all variants the soil have was treated with granulated FORCE G 1.5 insecticide, active ingredient 1.5%, (Syngenta) at a dose of 15 kg ha.During the entire period of observation, a total of 5810 adult specimens of Diabrotica virgifera virgifera were collected, where the first alert of the adult was made on 15  June, and its last registration was on 15 September

OBSERVATION OF THE ATTACK CAUSED BY THE LARVAE OF DIABROTICA VIRGIFERA VIRGIFERA, UNDER THE DIFERENT TILAGE IN CORN CROPS OF NEAMŢ COUNTY, UNDER CONDITIONS OF 2020

In the current context, of banning neonicotinoids triatments, tillage systems and crop rotation are vrey important rings in controlling larval attack. The samples was collected in the corn crop from Ghigoiesti stationary, Neamt County. .The period of observation, harvest samples was carried out between May and August 2020, by taking over biological material represented by corn roots, that have been brought into the laboratory for examination and processing the data obtained. From the collected biological material, the Diabrotica virgifera virgifera specimens that have been determined and centralized have been retained.  The material was harvested on the three variants represented by no tillage (V1), minimum tillage  (V2) and conventional tillage (V3). All three varians are planting in soil tratament with Force G 1.5.Folloing the collection of samples and after analises, during the period of observation, were had colected a number of 1239 specimens of larvae of Diabrotica virgifera virgifera. And  after centralization at variant 1 we totaled 457 specimens, at variant 2 we totaled 418 secimens and at variant 3 we totaled 364 specimens