Biodiversity of mermitids (Nematoda: mermithidae) parasitoids of aquatic diptera (Simuliidae, culicidae and chironomidae) in Argentina

Fil: Camino, Nora Beatriz. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios en Parasitología y Vectores (CEPAVE); ArgentinaFil: González, Sandra Elizabeth. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios en Parasitología y Vectores (CEPAVE); ArgentinaFil: Reboredo, Guillermo R.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Fisiología Animal; Argentin

Nueva especie de Neoparasitylenchus (Tylenchida, Allantonematidae), parasitando a Harmonia axyridis (Coleoptera, Coccinellidae) en Argentina

Presence of the genus Neoparasitylenchus Nickle, 1967 (Tylenchida, Allantonematidae), parasitizing Harmonia axyridis (Pallas, 1773) (Coleoptera, Coccinellidae) in Argentina. We describe a new species Neoparasitylenchus platense sp. n., which is characterized by having the free living stages lip region flatly rounded, spear slender, faintly knobbed, tail rounded, females with light brown body, stylet not sunken into body, and not prominent, subterminal vulva and anus, obtusely rounded tail end, with a peg-like projection, oviparous, and the males with a little stylet and partially degenerate oesophagus, spicules filiform with widened base, short gubernaculum, leptodera bursa. ________________________________________________________________Publicación registrada en Zoobank/ZooBank article registered:LSIDurn:lsid:zoobank.org:pub:FBE9DC98-04C4-4074-9037-1F5979320E2FActo nomenclatural/nomenclatural act:Neoparasitylenchus platense Camino, Reboredo & González, 2020LSIDurn:lsid:zoobank.org:act:B1146E52-46CC-40D0-B9FA-6627EA3B53E7________________________________________________________________Se cita por primera vez el género Neoparasitylenchus Nickle, 1967 (Tylenchida, Allantonematidae), parásito de Harmonia axyridis (Pallas, 1773) (Coleoptera, Coccinellidae) para Argentina. Se describe la especie nueva Neoparasitylenchus platense sp. n. que se caracteriza por tener en las formas de vida libre la región labial rodeada de una estructura plana, estilete delgado, levemente curvado, apéndice caudal redondeado, hembras con cuerpo marrón claro, estilete no hundido en el cuerpo y no prominente, vulva y ano subterminal, apéndice caudal redondeado, con una proyección en forma de clavija, ovíparos. Los machos con un estilete y un esófago parcialmente degenerados, espículas filiformes con base ensanchada, gubernaculum corto, bursa leptodera. ________________________________________________________________Publicación registrada en Zoobank/ZooBank article registered:LSIDurn:lsid:zoobank.org:pub:FBE9DC98-04C4-4074-9037-1F5979320E2FActo nomenclatural/nomenclatural act:Neoparasitylenchus platense Camino, Reboredo & González, 2020LSIDurn:lsid:zoobank.org:act:B1146E52-46CC-40D0-B9FA-6627EA3B53E7_______________________________________________________________

Teorethical studies of the stability of 8a-alkyll-1,2,3,4,6,8a- hexahydronaphtalen-1-ones using semiempirical methods

The Birch alkylation products are very unstable. We are showing, in this communication, the results of a theoretical study that compares different decomposition reaction mechanisms. The conclusions are in agreement with our experimental results.Facultad de Ciencias Exacta

Subharmonic stochastic synchronization and resonance in neuronal systems.

4 pages, 4 figures.-- PACS: 87.19.La, 05.40.Ca, 87.10.+eWe study the response of a model neuron, driven simultaneously by noise and at least two weak periodic signals. We focus on signals with frequencies components kf0,(k+1)f0,…(k+n)f0 with k>1. The neuron’s output is a sequence of pulses spaced at random interpulse intervals. We find an optimum input noise intensity for which the output pulses are spaced ∼1/f0, i.e., there is a stochastic resonance (SR) at a frequency missing in the input. Even higher noise intensities uncover additional, but weaker, resonances at frequencies present in the input. This is a different form of SR whereby the most robust resonance is the one enhancing a frequency, which is absent in the input, and which is not possible to recover via any linear processing. This can be important in understanding sensory systems including the neuronal mechanism for perception of complex tones.This work was supported by Spanish Ministerio de Ciencia y Technologia, Proyecto CONOCE contract BFM2000-1106, and by NIH-HL62543.Peer reviewe

Kinematics of gas and stars in circumnuclear star-forming regions of early type spirals

(Abbr.) We present high resolution (R~20000) spectra in the blue and the far red of cicumnuclear star-forming regions (CNSFRs) in three early type spirals (NGC3351, NGC2903 and NGC3310) which have allowed the study of the kinematics of stars and ionized gas in these structures and, for the first time, the derivation of their dynamical masses for the first two. In some cases these regions, about 100 to 150 pc in size, are seen to be composed of several individual star clusters with sizes between 1.5 and 4.9 pc estimated from Hubble Space Telescope (HST) images. The stellar dispersions have been obtained from the Calcium triplet (CaT) lines at $\lambda\lambda$ 8494,8542,8662 \AA, while the gas velocity dispersions have been measured by Gaussian fits to the H$\beta$ and [OIII] $\lambda\lambda$ 5007 \AA lines on the high dispersion spectra. Values of the stellar velocity dispersions are between 30 and 68 km/s. We apply the virial theorem to estimate dynamical masses of the clusters, assuming that systems are gravitationally bounded and spherically symmetric, and using previously measured sizes. The measured values of the stellar velocity dispersions yield dynamical masses of the order of 10$^7$ to 10$^8$ solar masses for the whole CNSFRs. Stellar and gas velocity dispersions are found to differ by about 20 to 30 km/s with the H$\beta$ emission lines being narrower than both the stellar lines and the [OIII] $\lambda\lambda$ 5007 \AA lines. The twice ionized oxygen, on the other hand, shows velocity dispersions comparable to those shown by stars, in some cases, even larger. We have found indications of the presence of two different kinematical components in the ionized gas of the regions...Comment: 4 pages, proceeding of the meeting "Young massive star clusters - Initial conditions and environments", Granada, Spain, 200

The Servet 3.0 benchmark suite: characterization of network performance degradation

This is a post-peer-review, pre-copyedit version of an article published in Computers & Electrical Engineering. The final authenticated version is available online at: https://doi.org/10.1016/j.compeleceng.2013.08.012.[Abstract] Servet is a suite of benchmarks focused on extracting a set of parameters with high influence on the overall performance of multicore clusters. These parameters can be used to optimize the performance of parallel applications by adapting part of their behavior to the characteristics of the machine. Up to now the tool considered network bandwidth as constant and independent of the communication pattern. Nevertheless, the inter-node communication bandwidth decreases on modern large supercomputers depending on the number of cores per node that simultaneously access the network and on the distance between the communicating nodes. This paper describes two new benchmarks that improve Servet by characterizing the network performance degradation depending on these factors. This work also shows the experimental results of these benchmarks on a Cray XE6 supercomputer and some examples of how real parallel codes can be optimized by using the information about network degradation.Ministerio de Ciencia e Innovación; TIN2010-16735Ministerio de Educación; AP2008-01578Ministerio de Educación; AP2010-4348European Commision; HPC-Europa2 Programme; 22839

Particle-structure interaction using cad-based boundary descriptions and isogeometric B-REP analysis (IBRA)

The procedure and the properties with the use of NURBS-described CAD models in particle-structure interaction are presented within this contribution. This implies the needed entities of those models and the description of trimmed multipatches to discretize analysis suitable numerical models. Finally, the properties will be shown with some test cases in comparison to analytical benchmarks and simulations with FEM as boundary description

Prevalencia serológica de gastroenteritis transmisible en cerdos en Colombia. Encuesta en mataderos, 1985

Se investigó la presencia de anticuerpos contra la gastroenteritis transmisible (GET) del cerdo por la técnica de seroneutralización, en sueros recolectados en mataderos de Bogotá, Barranquilla, Cúcuta, Medellín, Ipiales, Cali y Leticia. De 3125 sueros analizados se encontraron 16 reactores positivos correspondientes todos a cerdos muestreados en la ciudad de Bogotá, con títulos que fluctuaron entre 1:4 y 1:256. Por lo anterior, se estableció una prevalencia puntual de 1.11 por ciento para Bogotá y de 0.0 por ciento para las demás ciudades seleccionadas.The presence of antibodies against Transmissible Gastroenteritis of swine was investigated in sera from the abbatoir of seven main cities of the country (Bogota, Barranquilla, Cali, Cücuta, Ipiales, Leticia, Medellin). Among 3125 sera tested, 16 were positive (all from the same city) and showed titers ranging from 1:4 to 1:256. A puntual prevalence of 1.11 for Bogota and 0.0/ for the rest of the country was established. The disappearance of the disease is discussed.Porcicultur

Análisis del estado de tensiones en uniones carpinteras de empalme de llave por el método de los elementos finitos

El objeto del presente trabajo es la determinación de la distribución de tensiones en la unión carpintera de empalme de llave mediante el método de los elementos finitos y su comparación con los valores obtenidos mediante la teoría de Resistencia de Materiales. Se analizan las zonas donde se produce concentración de tensiones y se estudia la influencia del refino de la malla sobre los resultados con el fin de determinar el tamaño que proporciona los valores de tensión más ajustados a la teoría. En las zonas donde la concentración de tensiones es menor, distintos tamaños de la malla muestran valores de tensión similares. Los resultados muestran una simetría central de la distribución de isotensiones donde el centro de simetría se corresponde con el centro geométrico de la unión. En las zonas donde se produce concentración de tensiones, los valores de las mismas aumentan considerablemente con el refino de la malla. La comparación de los niveles de tensiones normales obtenidos por el MEF y la teoría clásica muestran diferencias reducidas, excepto en los puntos de concentración de tensiones. The purpose of this study is to determine the stress distribution in the joint carpenter of halved and tabled joint with the finite element method and its comparison with the values obtained using the theory of Strength of Materials. The stress concentration areas where analyzed and the influence of mesh refinement was studied on the results in order to determine the mesh size that provides the stress values more consistent with the theory. In areas where stress concentration is lower, different mesh sizes show similar stress values. The results show a central symmetry of the isobar lines distribution where the centre of symmetry corresponds to the geometric centre of the joint. In areas where stress concentration occurs, the same values increase considerably with the refinement of the mesh. Comparison of normal stress levels obtained by the FEM and the classical theory shows small differences, except at points of stress concentration

DOS ESPECIES NUEVAS DE NEMÁTODOS THELASTOMATIDAE PARÁSITOS DE LA CUCARACHA SILVESTRE BLAPTICA DUBIA SERVILLE, 1839 (BLATTODEA, BLABERIDAE) EN ARGENTINA

Two new species nematodes (Thelastomatidae) are described. Both parasites of the wild cockroach Blaptica dubia Serville, 1839 (Blattodea, Blaberidae), found in the Horticultural Belt of La Plata, Argentina. Thelastoma simplex sp. n. is characterized by small, pear-shaped amphidia, cuticularized stoma, no teeth, nerve ring anterior to the basal bulb, excretory pore is situated between basal bulb and beginning of the intestine, vulva protuberant in half of body, muscular vagina, amphidelphic, with anal wing and a very long, threadlike caudal appendage. Males with spicules on anal promontory accompanied by a thick, strong gubernaculum, genital papillae in three simple preanal papillae, of which the first is very large, adanal pair and a simple postanal at base of caudal appendage. Blattophila incomptus sp. n. has short stoma with plate and two teeth, large amphidia, excretory pore near base of the basal bulb, nerve ring located at anterior end of the corpus, dilated intestine at anterior end, vulva in half of body, vagina directed anteriorly. Males with a rudimentary pointed spicule, gubernaculum present, male genital papillae arranged in an unpaired preanal and two postanal papillae, the caudal appendage long and filiform.Se describen dos especies nuevas de nemátoda (Thelastomatidae). Ambas parásitas de la cucaracha silvestre Blaptica dubia Serville, 1839 (Blattodea, Blaberidae), halladas en el Cinturón Hortícola de La Plata, Argentina. Thelastoma simplex sp. n. que se caracteriza por presentar anfidios pequeños y piriformes, estoma cuticularizado, sin dientes, el anillo nervioso se observa anterior al bulbo basal, el poro excretor entre el bulbo basal y el comienzo del intestino, la vulva protuberante en la mitad del cuerpo, vagina muscular, anfidélfica, con ala anal y un apéndice caudal muy largo y filiforme. Machos con espículas en un promontorio anal acompañado de un gubernáculo grueso y fuerte, las papilas genitales en tres papilas preanales simples, de las cuales la primera es muy grande, un par adanal y una simple postanal en la base del apéndice caudal. Blattophila incomptus sp. n.  identificándose por un estoma corto con una placa y dos dientes, anfidios grandes, el poro excretor cerca de la base del bulbo basal, el anillo nervioso ubicado en el extremo anterior del corpus, el intestino dilatado en el extremo anterior, la vulva situada en la parte media del cuerpo, vagina dirigida anteriormente. Machos con una espícula de punta rudimentaria, gubernáculo presente, papilas genitales masculinas dispuestas en una papila impar preanal y dos postanales, el apéndice caudal largo y filiforme