Elementos florísticos del Pérmico Argentino : las glossopterideas de la Serie Nueva Lubecka, provincia de Chubut

Fil: Archangelsky, Sergio. Cátedra de Paleobotánica, Facultad de Ciencias Naturales y Museo, UNLPFil: Arrondo, Oscar G.. CONICE

El género Lepidodendropsis Lutz del Carbónico Inferior de Argentina

Fil: Arrondo, Oscar G.. División Paleobotánica; Facultad de Ciencias Naturales y Museo; Universidad Nacional de La PlataFil: Petriella, Bruno. División Paleobotánica; Facultad de Ciencias Naturales y Museo; Universidad Nacional de La Plat

El género Lycopodiopsis [Lycopodiopsidaceae, Lepidodendrales], del carbónico Medio-Pérmico Inferior de la Argentina

Fil: Arrondo, Oscar G.. División Paleobotánica; Facultad de Ciencias Naturales y Museo; Universidad Nacional de La PlataFil: Petriella, Bruno. División Paleobotánica; Facultad de Ciencias Naturales y Museo; Universidad Nacional de La Plat

Curves and vector bundles on quartic threefolds

In this paper we study arithmetically Cohen-Macaulay (ACM for short) vector bundles E of rank k 3 on hypersurfaces Xr P4 of degree r 1. We consider here mainly the case of degree r = 4, which is the first unknown case in literature. Under some natural conditions for the bundle E we derive a list of possible Chern classes (c1, c2, c3) which may arise in the cases of rank k = 3 and k = 4, when r = 4 and we give several examples

Early stages of LDL oxidation: apolipoprotein B structural changes monitored by infrared spectroscopy.

Changes in the conformation of apoliprotein B-100 in the early stages of copper-mediated low density lipoprotein oxidation have been monitored by infrared spectroscopy. During the lag phase no variation in structure is observed, indicating that copper binding to the protein does not significantly affect its structure. In the propagation phase, while hydroperoxides are formed but the protein is not modified, no changes in secondary structure are observed, but the thermal profile of the band corresponding to alpha-helix is displaced in frequency, indicating changes in tertiary structure associated with this conformation but not with beta-sheet components. When aldehyde formation starts, a decrease of approximately 3% in the area of bands corresponding to alpha-helix and beta-sheet is produced, concomitantly with an increase in beta-turns and unordered structure. The two bands corresponding to beta-turns vary as well under these conditions, indicating changes in these structures. Also at this stage the thermal profile shows variations in frequency for the bands corresponding to both alpha-helix and beta-sheet.The results are consistent with the hypothesis that as soon as the polyunsaturated fatty acids from the particle core are modified, this change is reflected at the surface, in the alpha-helical components contacting the monolayer.Fil: Chehin, Rosana Nieves. Consejo Superior de Investigaciones Científicas; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina. Universidad del País Vasco; EspañaFil: Rengel, David. Consejo Superior de Investigaciones Científicas; España. Universidad del País Vasco; EspañaFil: Milicua, José Carlos G.. Universidad del País Vasco; España. Consejo Superior de Investigaciones Científicas; EspañaFil: Goñi, Félix M.. Universidad del País Vasco; España. Consejo Superior de Investigaciones Científicas; EspañaFil: Arrondo JL. Consejo Superior de Investigaciones Científicas; España. Universidad del País Vasco; EspañaFil: Pifat, Greta. Rudjer Bošković Institute; Croaci

Visualización de modelos digitales tridimensionales en la enseñanza de anatomía: principales recursos y una experiencia docente en neuroanatomía

La conformación de las estructuras anatómicas es compleja en los 3 planos del espacio. Históricamente, la enseñanza de la anatomía se ha hecho a partir de representaciones bidimensionales, de modelos físicos tridimensionales o de cuerpos reales. Solo recientemente ha sido factible crear modelos anatómicos digitales tridimensionales, que pueden ser explorados en línea a través de Internet. El objetivo del presente trabajo es analizar 2 de las herramientas en línea más conocidas para la visualización anatómica (Anatomography® y BioDigital® Human), y presentar una experiencia docente de uso en el área de neurociencias. Se crearon imágenes de estructuras cerebrales animadas que se usaron en clase posteriormente, y se preguntó a los alumnos sobre su interés y utilidad. Los resultados indicaron que la utilización de este tipo de recursos es interesante por su flexibilidad, atractivo y coste.The conformation of anatomical structures is complex in the 3 spatial planes. Historically, anatomy teaching has been carried out using 2-dimensional representation, 3-dimensional physical models, or real bodies. Only recently has it been possible to create digital 3-dimensional anatomical models that can be explored online or downloaded. The aim of this work is to critically describe two of the best-known online tools for anatomical visualisation (Anatomography® and BioDigital® Human), and to present a teaching experience in the neuroscience domain. Animated images of brain structures were created and later used in class, and students were asked about their interest and usefulness. Results indicated that the use of this kind of resource is interesting, due to its flexibility, attractiveness and cost

Experimental and natural infections of severe acute respiratory syndrome-related coronavirus 2 in pets and wild and farm animals

The severe acute respiratory syndrome-related coronavirus 2 (SARS-CoV-2) has spread globally and has led to extremely high mortality rates. In addition to infecting humans, this virus also has infected animals. Experimental studies and natural infections showed that dogs have a low susceptibility to SARS-CoV-2 infection, whereas domesticated cats and other animals in the family Felidae, such as lions, tigers, snow leopards, and cougars, have a high susceptibility to viral infections. In addition, wild white-tailed deer, gorillas, and otters have been found to be infected by SARS-CoV-2. Furry farm animals, such as minks, have a high susceptibility to SARS-CoV-2 infection. The virus appears to spread among minks and generate several new mutations, resulting in increased viral virulence. Furthermore, livestock animals, such as cattle, sheep, and pigs, were found to have low susceptibility to the virus, whereas chicken, ducks, turkeys, quail, and geese did not show susceptibility to SARS-CoV-2 infection. This knowledge can provide insights for the development of SARSCoV-2 mitigation strategies in animals and humans. Therefore, this review focuses on experimental (both replication and transmission) in vitro, ex vivo, and in vivo studies of SARS-CoV-2 infections in pets and in wild and farm animals, and to provide details on the mechanism associated with natural infection. Copyright: Mastutik, et al

Tendencias estratégicas de personas con TDAH en un simulador de tablero por equipos

El trastorno de déficit de atención con hiperactividad puede llegar a afectar de manera negativa a quienes lo padecen. La dificultad para tomar decisiones estratégicas y su capacidad para formar y mantener relaciones interpersonales estables son de los elementos característicos que repercuten en el desenvolvimiento del día a día de estas personas. El objetivo de este protocolo es plantear un diseño experimental de pacientes (personas con TDAH, N=64) y controles (personas sin TDAH, N=64) para poder profundizar en las repercusiones que puede llegar a tener el TDAH al momento de planificar y trabajar en equipo. Se propone utilizar el simulador estratégico de tablero por equipos “8 Batallones”. Se buscaría estudiar los resultados obtenidos a lo largo de una serie de partidas donde los pacientes jugarían contra los controles. Posteriormente se buscaría analizar las diferencias entre estas y las posibles causas de los resultados por medio de un modelo lineal general. La metodología planteada podría permitir un acercamiento al estudio de las interacciones y los resultados de los mismos por medio de instrumentos lúdicos

Vector bundles on fano 3-folds without intermediate cohomology

A well known result of G. Horrocks [Proc. Lond. Math. Soc. (3) 14, 689-713 (1964; Zbl 0126.16801)] says that a vector bundle on a projective space has no intermediate cohomology if and only if it decomposes as a direct sum of line bundles. It is also known that only on projective spaces and quadrics there is, up to a twist by a line bundle, a finite number of indecomposable vector bundles with no intermediate cohomology [see R.-O. Buchweitz, G.-M. Greuel and F.-O. Schreyer, Invent. Math. 88, 165-182 (1987; Zbl 0617.14034) and also H. Kn¨orrer, Invent. Math. 88, 153-164 (1987; Zbl 0617.14033)]. In the paper under review the authors deal with vector bundles without intermediate cohomology on some Fano 3-folds with second Betti number b2 = 1. The Fano 3-folds they consider are smooth cubics in P4, smooth complete intersection of type (2, 2) in P5 and smooth 3-dimensional linear sections of G(1, 4) P9. A complete classification of rank two vector bundles without intermediate cohomology on such 3-folds is given. In fact the authors prove that, up to a twist, there are only three indecomposable vector bundles without intermediate cohomology. Vector bundles of rank greater than two are also considered. Under an additional technical condition, the authors characterize the possible Chern classes of such vector bundles without intermediate cohomology