6,944 research outputs found

    CM-points and Lattice counting on arithmetic compact Riemann surfaces

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    Let X(D,1)=Γ(D,1)\HX(D,1) =\Gamma(D,1) \backslash \mathbb{H} denote the Shimura curve of level N=1N=1 arising from an indefinite quaternion algebra of fixed discriminant DD. We study the discrete average of the error term in the hyperbolic circle problem over Heegner points of discriminant d<0d <0 on X(D,1)X(D,1) as dd \to -\infty. We prove that if d|d| is sufficiently large compared to the radius rlogXr \approx \log X of the circle, we can improve on the classical O(X2/3)O(X^{2/3})-bound of Selberg. Our result extends the result of Petridis and Risager for the modular surface to arithmetic compact Riemann surfaces.Comment: 10 pages; Final version to appear in Journal of Number Theor

    Revisión del género de abejas Ceratina, subgénero Rhysoceratina (Hymenoptera, Apidae, Xylocopinae)

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    El subgénero Rhysoceratina de Ceratina está restringido a América del Sur, con especies conocidas de Argentina, Brasil, Colombia, Paraguay y Uruguay. Se reconocen nueve especies, de la cuales cuatro se describen como nuevas: C. canaliculata, C. pusilla, C. mendozina y C. nitidifrons. Se designa lectotipos para C. catamarcensis Schrottky, 1907, y para C. volitans Schrottky, 1907. El análisis filogenético apoya la monofilia del subgénero y dentro de él de dos grupos principales de especies. Se presenta una clave de especies, descripciones, datos de distribución e ilustraciones.The subgenus Rhysoceratina of Ceratina is restricted to South America, with known species in Argentina, Brazil, Colombia, Paraguay, and Uruguay. Nine species are recognized, four of which are described as new: C. canaliculata, C. pusilla, C. mendozina, and C. nitidifrons. Lectotypes are designated for C. catamarcensis Schrottky, 1907, and C. volitans Schrottky, 1907. A phylogenetic analysis supports the monophyly of the subgenus and, within it, of two major species groups. A key to the species, descriptions, distributional data, and illustrations are provided.Fil: Roig Alsina, Arturo Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

    El culte a Santa Tecla a la Tarragona del segle XIII: Aspàrrech de la Barca i el frontal de marbre

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    En l'article s'estudia l'obra que més contribuí a la materialització, consolidació i difusió del culte i devoció a Santa Tecla a la catedral de Tarragona. Es tracta del frontal de marbre situat a l'absis central, on apareixen diverses escenes del martiri de la santa. S'atribueix l'encàrrec de l'obra a l'arquebisbe Aspàrrech de la Barca

    First report of Monoeca in Argentina, with description of two new species (Hymenoptera: Apidae)

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    Two new species of the oil-collecting bee genus Monoeca Lepeletier & Audinet-Serville (Apidae: Tapinotaspidini) are described and figured from females and males captured in north - eastern Argentina. The two new species here described, Monoeca armata Torretta & Roig-Alsina, new species, and M. puchella Torretta & Roig-Alsina, new species, are easily distinguished from each other by the color of the integument, the wings, and the pilosity. Their relationships to al - ready described species of the genus are discussed. Monoeca were the only genus of Tapinostaspi - dini not known to occur in Argentina. The flower records and the study of the pollen scopal loads corroborate the association of these oil-collecting bees with p lants of the family Malpighiaceae.Fil: Torretta, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Cátedra de Botánica Agrícola; ArgentinaFil: Roig Alsina, Arturo Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentin

    A Concise Atlas of Thyroid Cancer Next-Generation Sequencing Panel ThyroSeq v.2

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    The next-generation sequencing technology allows high out-put genomic analysis. An innovative assay in thyroid cancer, ThyroSeq® was developed for targeted mutation detection by next generation sequencing technology in fine needle aspiration and tissue samples. ThyroSeq v.2 next generation sequencing panel offers simultaneous sequencing and detection in >1000 hotspots of 14 thyroid cancer-related genes and for 42 types of gene fusions known to occur in thyroid cancer. ThyroSeq is being increasingly used to further narrow the indeterminate category defined by cytology for thyroid nodules. From a surgical perspective, genomic profiling also provides prognostic and predictive information and closely relates to determination of surgical strategy. Both the genomic analysis technology and the informatics for the cancer genome data base are rapidly developing. In this paper, we have gathered existing information on the thyroid cancer-related genes involved in the initiation and progression of thyroid cancer. Our goal is to assemble a glossary for the current ThyroSeq genomic panel that can help elucidate the role genomics play in thyroid cancer oncogenesis
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