76 research outputs found

    Distribution of Eigenvalues for the Modular Group

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    The two-point correlation function of energy levels for free motion on the modular domain, both with periodic and Dirichlet boundary conditions, are explicitly computed using a generalization of the Hardy-Littlewood method. It is shown that ion the limit of small separations they show an uncorrelated behaviour and agree with the Poisson distribution but they have prominent number-theoretical oscillations at larger scale. The results agree well with numerical simulations.Comment: 72 pages, Latex, the fiogures mentioned in the text are not vital, but can be obtained upon request from the first Autho

    Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX

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    We detected recent star formation in nearby early-type galaxies located in low density environments, with GALEX Ultraviolet (UV) imaging. Signatures of star formation may be present in the nucleus and in outer rings/arm like structures. Our study suggests that such star formation may be induced by different triggering mechanisms, such as the inner secular evolution driven by bars, and minor accretion phenomena. We investigate the nature of the (FUV-NUV) color vs. Mg2 correlation, and suggest that it relates to "downsizing" in galaxy formation.Comment: Conference "UV Universe 2010" S. Petersburg 31 May - 3 June, 2010 Accepted for publication in Astrophysics & Space Science . The final publication is available at http://www.springerlink.co

    Role of genetic testing for inherited prostate cancer risk: Philadelphia prostate cancer consensus conference 2017

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    Purpose: Guidelines are limited for genetic testing for prostate cancer (PCA). The goal of this conference was to develop an expert consensus-dri

    Propriedades químicas de uma Terra Roxa Estruturada influenciadas pela cobertura vegetal de inverno e pela adubação orgùnica e mineral

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    O presente trabalho teve por objetivo avaliar a influĂȘncia da cobertura vegetal de inverno, constituĂ­da de uma associação de aveia preta (Avena strigosa Schreb) com nabo forrageiro (Raphanus sativus L.), da adubação orgĂąnica com esterco de aves e da adubação mineral sobre propriedades quĂ­micas de uma Terra Roxa Estruturada do estado de Santa Catarina. As anĂĄlises foram realizadas em amostras de solo coletadas em agosto de 1994 e janeiro de 1995, nas profundidades de 0-10, 10-20 e 20-30 cm, em um experimento iniciado em 1990. Observou-se que a cobertura vegetal de inverno mostrou-se eficiente na manutenção de nutrientes, especialmente o potĂĄssio, e dos nĂ­veis de carbono orgĂąnico, dentro dos limites da camada arĂĄvel. O uso de adubo orgĂąnico proporcionou acĂșmulo de nutrientes no solo, enquanto os adubos organomineral e mineral mostraram tendĂȘncia de redução, principalmente dos nĂ­veis de potĂĄssio do solo

    The formation of disc galaxies

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    We investigate the influence of the cooling epoch on the formation of galaxies in a cold dark matter dominated universe. Isolated haloes, with circular speeds typical of spiral galaxies, have been selected from a low resolution numerical simulation for re-simulation at higher resolution with dark matter and gas components. The initial conditions are evolved with two smoothed particle hydrodynamics codes, TREESPH and GRAPESPH. In previous SPH simulations, strong outward transport of angular momentum has led to the formation of disc-like systems with much smaller angular momenta than observed in real disc galaxies. Here we investigate whether this problem can be circumvented if feedback processes prevent disc formation until late epochs. The results of varying the cooling epoch for each of five different haloes are analysed. When cooling and star formation occur at early times, stellar discs are destroyed during merger events and we observe similar catastrophic transport of angular momentum as seen in previous work. With cooling suppressed until z=1, discs can form by the present day with angular momenta comparable to those of observed disc galaxies. We conclude that feedback processes, which prevent gas from collapsing until late epochs, are an essential ingredient in disc galaxy formation.Comment: 19 pages, LaTeX, MNRAS format, 14 inlined and 2 external Postscript figures. Submitted to MNRA

    Evaluation of different antibodies for immunostaining of Wolbachia in Brugia Malayi and other filarial parasites

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    High prevalence of hepatitis B virus (HBV) infection in China offers a unique setting to examine HBVs influence on the presentation of dengue fever. In 398 patients admitted for suspected dengue fever, 89% (353/398) were positive for dengue IgM antibodies. Among dengue-infected patients, 8% (29/353) had chronic HBV co-infection. Only dengue virus serotype 1 was identified by virus isolation and reverse transcriptase-polymerase chain reaction assays. No case of dengue hemorrhagic fever/dengue shock syndrome was diagnosed. In addition to routine clinical tests, interleukin 2 (IL-2), IL-4, IL-6, IL-10, interferon \u3b3 (IFN\u3b3), and tumor necrosis factor \u3b1 (TNF\u3b1) levels were measured in the sera of 95% (334/353) of dengue-infected subjects as well as controls. Surprisingly, HBV/dengue co-infected patients made less IL-6 (P < 0.05) and TNF\u3b1 (P < 0.05) than patients with only dengue infection. Similar levels of IL-4, IL-10, and IFN\u3b3 were found in both groups. Thus, HBV co-infection seems to alter the cytokine production pattern when patients contract dengue infection. Copyrigh
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