542 research outputs found
Perfil de alguns parâmetros imunológicos após o término da poliquimioterapia para hanseníase
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde.Análise da Resposta Imune Humoral e Celular em 25 pessoas que terminaram a poliquimioterapia (PQT) para hanseníase, classificadas como multibacilares(MB) e 7 classificadas como paucibacilares (PB). Realizado testes de mitsuda, proteína C reativa, Neopterina, pesquisa de anticorpo antiPGL-1 IgM, VDRL, FTA-ABS e eletroforese de proteínas. O grupo MB manteve a suscetibilidade a doença com altos títulos de anticorpo e o grupo PB manteve a resistência com testes de mitsuda positivos e sorologia negativa
X-ray imaging of the Cr and Fe lines from Cassiopeia A
No full textFollow-up Suzaku X-ray observations of a young supernova remnant Cassiopeia A carried out with a long exposure of ˜ 165 ksec in 2012. Owing to the high statistics of the data, the map of Cr-K line is made. The flux map of Cr-K line is similar to that of Fe-K. The similarity indicates that the reverse shock is currently heating the electra layer that the Fe and Cr elements co-exists i
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No full textMayor John O. Leslie, Governor Allain, Mr. Mitsuda, Naofumi Hayakawa and Masa Hashimotohttps://egrove.olemiss.edu/leslie/1107/thumbnail.jp
Search for X-ray emission from the Shapley supercluster and the WHIM with Suzaku
No full textSuzaku performed observations of 3 regions in and around the Shapley supercluster: a region located between A3558 and A3556, at similar to 0.9 times the virial radii of both clusters, and two other regions at 1 degrees and 4 degrees away from the first pointing. The 4 degrees-offset observation was used to evaluate the Galactic foreground emission. We did not detect significant redshifted Oxygen emission lines (O-VII and O-VIII) in the spectra of all three pointings, after subtracting the contribution of foreground and background emission. An upper limit for the redshifted O-VIII K alpha line intensity of the warm-hot intergalactic medium (WHIM) is 1.5 x 10(-7) photons s(-1) cm(-2) arcmin(-2), which corresponds to an overdensity of similar to 380 (Z/0.1 Z(circle dot))(-1/2)(L/3 Mpc)(-1/2), assuming T = 3 x 10(6) K. We found excess continuum emission in the 1 degrees-offset and on-filament regions, represented by thermal models with kT similar to 1 keV and similar to 2 keV, respectively. The redshifts of both 0 and that of the supercluster (0.048) are consistent with the observed spectra. The similar to 1 keV emission can be also fitted with Ne-rich Galactic (zero redshift) thin thermal emission. Radial intensity profile of 2 keV component suggests contribution from nearby clusters A3558 and A3556, but with significant steepening of the intensity slope in the outer region of A3558
The major secreted antigen complex (Ag 85) from Mycobacterium bovis bacille Calmette-Guérin is associated with protective T cells in leprosy: a follow-up study of 45 household contacts.
No full textT cell proliferation and interferon (IFN)-gamma secretion were analyzed in 45 leprosy contacts stimulated with antigen 85 (Ag85), the major culture filtrate antigen from Mycobacterium bovis bacille Calmette-Guérin. All 14 Mitsuda reaction-positive contacts reacted to Mycobacterium leprae and Ag85. Three Mitsuda reaction-negative contacts reacted weakly to M. leprae and Ag85. The other 28 Mitsuda reaction-negative contacts did not react to M. leprae, but 9 reacted to Ag85. Thirty-four contacts were retested 16 months later. Eleven contacts initially positive by the Mitsuda test remained lepromin positive and reactive to M. leprae and Ag85. Fourteen contacts initially negative by the Mitsuda test converted, and all reacted in vitro to M. leprae and Ag85. Finally, 9 contacts remained Mitsuda test-negative, and 7 were unreactive to Ag85. In vitro reactivity to Ag85 at baseline in Mitsuda test-negative contacts was associated with subsequent conversion to lepromin reactivity in 7 of 9 subjects. These data suggest that reactive T cells against Ag85 develop very early during M. leprae infection and that Ag85 is a potentially protective T cell immunogen.Journal ArticleResearch Support, Non-U.S. Gov'tSCOPUS: ar.jinfo:eu-repo/semantics/publishe
X-ray spectral and timing studies of black hole transients in the hard state at low luminosity
No full textOur Suzaku program for observing accreting black holes has focused on studying transient systems in the hard state at low luminosity. This is the one state that is associated with the presence of a steady jet, and thus, understanding the physics of the hard state is critical to understanding the disk/jet connection. However, questions remain about the accretion geometry, its evolution, and its relation to jet production. With Suzaku, we have observed the black hole transients GX 339-4 and 4U 1630-47. Here, we compare the results from the two observations, focusing on the new 4U 1630-47 measurements. While the 4U 1630-47 observation occurred at a low luminosity (0.017%LEdd), and the spectrum is consistent with a hard state, the lack of variability is unusual. We discuss the implications of the lack of variability at such a low mass accretion rate
An x-ray spectroscopic search for dark matter and unidentified line signatures in the perseus cluster with hitomi
No full text© The Author(s) 2019. Published by Oxford University Press on behalf of the Astronomical Society of Japan.The reported detection of a 3.5 keV emission signal in the Perseus cluster core by Bulbul et al. (2014, ApJ, 789, 13) was ruled out at high confidence in analysis conducted by Aharonian et al. (2017, ApJ, 837, L15) of X-ray spectra at 5 eV energy resolution obtained with the Hitomi observatory Soft X-ray Spectrometer (SXS). Using the same data, we search the full 2–12 keV SXS energy band for previously unidentified emission and absorption features. No significant unidentified line emission or absorption is found. Line flux upper limits (1σ per resolution element) vary with photon energy and assumed intrinsic width, decreasing from ∼100 at 2 keV to <10 photons cm−2 s−1 sr−1 over most of the 5–10 keV energy range for a Gaussian line with Doppler broadening of 640 km s−1. Limits for narrower and broader lines have a similar energy dependence and are systematically smaller and larger, respectively. These line flux limits are used to constrain the decay rate of hypothetical dark matter candidates. For the sterile neutrino decay rate, we place new constraints over the mass range of 4–24 keV with mass resolution better than any previous X-ray analysis. Additionally, the accuracy of relevant thermal spectral models and atomic data are evaluated. The Perseus cluster spectra may be described by a composite of multi-temperature thermal and active galactic nuclei (AGN) power-law continua. Superposed on these, a few line emission signals possibly originating from unmodeled atomic processes (including Si XIV and Fe XXV) are marginally detected and tabulated. Comparisons with previous X-ray upper limits and future prospects for dark matter searches using high-energy resolution spectroscopy are discussed11Nsciescopu
Molecular Beam Epitaxy Growth of Superconducting Ba<sub>1-x</sub>K<sub>x</sub>Fe<sub>2</sub>As<sub>2</sub> and SmFeAs(O,F) Films
No full text
We report the molecular beam epitaxy (MBE) growth of the iron-based superconductors, Ba1-x
K
x
Fe2As2 and SmFeAs(O,F). In the growth of Ba1-x
K
x
Fe2As2 films, the key to incorporating volatile K in films is low-temperature (≤350 °C) growth in reduced As flux. The highest T
c thus far obtained is T
c
on (T
c
end) = 38.0 K (35.8 K). In the growth of superconducting SmFeAs(O,F), we adopted two methods. In the first method, we first grew pristine SmFeAsO films, and subsequently introduced F into the films by diffusion from an overlayer of SmF3. In the second method, we grew as-grown superconducting SmFeAs(O,F) films by coevaporating Sm, SmF3, Fe, and As. Thus far, better results have been obtained by the first F diffusion method. The films prepared by F diffusion showed T
c
on (T
c
end) = 56.5 K (55.3 K), whereas the as-grown films showed T
c
on (T
c
end) = 51.5 K (48.0 K).
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