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Search Results: 1 - 10 of 232387 matches for " Jorge L. Rodriguez "
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Hadronic Decays of Beauty and Charm from CLEO
Jorge L. Rodriguez
Physics , 1999, DOI: 10.1063/1.57752
Abstract: A selection of recent results on hadronic charm and beauty decays from the CLEO experiment are presented. We report preliminary evidence for the existence of final state interactions in B decays and the first observation of the decay B0 -> D*+D*- with a branching fraction of (6.2^{+4.0}_{-2.9}+/- 1.0)x10^{-4}. We also present preliminary results on the first observation of the broad, J^P=1^+, charmed meson resonance with a mass of 2.461^{+0.041}_{-0.034}+/-0.010+/-0.032 GeV and a width of 290^{+101}_{-79}+/-26+/-36 MeV and branching fraction measurements of the B- -> D_J^0pi- decays. Finally, we report on search for the radial excitation of a spin 1 charmed meson, the D*'+, and on an improved measurement of the ratio of (D0 -> K+pi-)/(D0 -> K-pi^+) decay rates.
Factorization and Color-Suppression in Hadronic B->D^(*)npi Decays
Jorge L. Rodriguez
Physics , 1996,
Abstract: The factorization hypothesis and color-suppression are investigated by analyzing the largest, to date, sample of B mesons. In all, 20 hadronic two-body decay modes are reconstructed using 2.04 fb^-1 of data collected with the CLEOII detector. We measure the branching fraction of five class I and five class III decay modes and set upper limits on branching fractions of ten class II decays. The branching fraction measurements are used to determine the BSW parameters a_1, and a_2/a_1. In addition, we measure the fraction of B-> D^{*+} rho^- decays which decay longitudinally polarized. The results are found to be consistent with factorization and color-suppression.
$b \to c$ Hadronic Decays
Jorge L. Rodriguez
Physics , 1998,
Abstract: A review of current experimental results on exclusive hadronic decays of bottom mesons to a single or double charmed final state is presented. We concentrate on branching fraction measurements conducted at $e^+e^-$ colliders at the $\Upsilon(4s)$ and at the $Z^0$ resonance. The experimental results reported are then used in tests of theoretical model predictions, the determination of the QCD parameters $a_1$ and $a_2/a_1$ and tests of factorization
Measurement of sin2phi_1 at Belle
Jorge L. Rodriguez
Statistics , 2000, DOI: 10.1142/S0217751X01007595
Abstract: With 6.2 fb^-1 of data collected on the Upsilon(4S), Belle reports its first measurement of sin 2\phi_1 = 0.45^{+0.43}_{-0.44}(stat)^{+0.07}_{-0.09}(sys). The result was obtained by fitting the proper time distribution of flavor tagged and fully reconstructed neutral B mesons decays to five different charmonia plus a Kshort or Klong channels. In this paper the analysis and results will be described briefly.
Aislamientos de cepas fijadoras de nitrógeno y solubilizadoras de fósforo en un suelo alfisol venezolano
Padron, Learsy;Torres Rodriguez, Duilio Gilberto;Contreras Olmos, Jorge;López, Marisol;Colmenares, Carlos;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: in order to evaluate the potential of soils in the middle valley of yaracuy river in venezuela for the production of biofertilizers, nitrogen fixed strains (fbn) and phosphorus-solubilizing strains (sf) were isolated in soils subjected to different management conditions. for this, rizhosferic samples in six different land uses were taken in april, 2010. sugarcane (sacharum officinarum), maize (zea mayz l.), pawpaw (carica papaya), grass (brachiaria decumbens) and a forest area were sampled. bacteria fnvl and sf were isolated using ashby and pikoskaya, respectively. chemical and physical properties were evaluated in all soils to determine the relationship between them and the development of the strains. results showed that fn developed better in grass and sugarcane, with 20 and 10 strains respectively, indicating that fnvl strains developed better in uses with low amounts of organic matter or intensive management. the greatest number of sf bacteria was found in land uses with a higher amount of phosphorous (papaya), with 13 colonies, or in uses with adequate physical conditions for the growth of microorganisms (natural forest), with 10 colonies.
Clinical guideline for diagnosis and management of melioidosis
Inglis, Timothy J.J.;Rolim, Dionne B.;Rodriguez, Jorge L.N.;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2006, DOI: 10.1590/S0036-46652006000100001
Abstract: melioidosis is an emerging infection in brazil and neighbouring south american countries. the wide range of clinical presentations include severe community-acquired pneumonia, septicaemia, central nervous system infection and less severe soft tissue infection. diagnosis depends heavily on the clinical microbiology laboratory for culture. burkholderia pseudomallei, the bacterial cause of melioidosis, is easily cultured from blood, sputum and other clinical samples. however, b. pseudomallei can be difficult to identify reliably, and can be confused with closely related bacteria, some of which may be dismissed as insignificant culture contaminants. serological tests can help to support a diagnosis of melioidosis, but by themselves do not provide a definitive diagnosis. the use of a laboratory discovery pathway can help reduce the risk of missing atypical b. pseudomallei isolates. recommended antibiotic treatment for severe infection is either intravenous ceftazidime or meropenem for several weeks, followed by up to 20 weeks oral treatment with a combination of trimethoprim-sulphamethoxazole and doxycycline. consistent use of diagnostic microbiology to confirm the diagnosis, and rigorous treatment of severe infection with the correct antibiotics in two stages; acute and eradication, will contribute to a reduction in mortality from melioidosis.
Clinical guideline for diagnosis and management of melioidosis
Inglis Timothy J.J.,Rolim Dionne B.,Rodriguez Jorge L.N.
Revista do Instituto de Medicina Tropical de S?o Paulo , 2006,
Abstract: Melioidosis is an emerging infection in Brazil and neighbouring South American countries. The wide range of clinical presentations include severe community-acquired pneumonia, septicaemia, central nervous system infection and less severe soft tissue infection. Diagnosis depends heavily on the clinical microbiology laboratory for culture. Burkholderia pseudomallei, the bacterial cause of melioidosis, is easily cultured from blood, sputum and other clinical samples. However, B. pseudomallei can be difficult to identify reliably, and can be confused with closely related bacteria, some of which may be dismissed as insignificant culture contaminants. Serological tests can help to support a diagnosis of melioidosis, but by themselves do not provide a definitive diagnosis. The use of a laboratory discovery pathway can help reduce the risk of missing atypical B. pseudomallei isolates. Recommended antibiotic treatment for severe infection is either intravenous Ceftazidime or Meropenem for several weeks, followed by up to 20 weeks oral treatment with a combination of trimethoprim-sulphamethoxazole and doxycycline. Consistent use of diagnostic microbiology to confirm the diagnosis, and rigorous treatment of severe infection with the correct antibiotics in two stages; acute and eradication, will contribute to a reduction in mortality from melioidosis.
Aislamientos de cepas fijadoras de nitrógeno y solubilizadoras de fósforo en un suelo alfisol venezolano Isolation of nitrogen-fixing and phosporus-solubilizing strains in alfisol soils of Venezuela
Learsy Padron,Duilio Gilberto Torres Rodriguez,Jorge Contreras Olmos,Marisol López
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Para evaluar el potencial de los suelos del Valle Medio del Río Yaracuy para la producción de biofertilizantes, se aislaron cepas fijadoras de nitrógeno (FNVL) y solubilizadoras de fósforo (SF) en suelos sometidos a diferentes condiciones de manejos. Para ello muestra rizosferica en los usos ca a de azúcar (Sacharum oficcinarum), maíz (Zea mayz L.), lechoza (Carica papaya), pasto (Brachiaria decumbens), además de un área bajo bosque natural, las muestras fueron tomadas en abril de 2010, las bacterias FNVL y SF fueron aisladas usando medio Ashby y Pikoskaya respectivamente, las principales propiedades químicas y físicas del suelo fueron evaluadas, para establecer su relación con el desarrollo de las cepas. Los resultados muestran que las FN se desarrollaron mejor en los usos pasto y ca a de azúcar con 20 y 10 cepas respectivamente, lo que indica que las cepas FNVL se desarrollaron mejor en aquellos manejos con bajo contenido de materia orgánica o manejo intensivo, el mayor numero de bacterias SF se observaron en aquellos manejos con mayor contenido de fósforo (lechoza) con 13 colonias, o en usos con adecuadas condiciones físicas para el desarrollo microorganismos (bosque), con 10 colonias. In order to evaluate the potential of soils in the Middle Valley of Yaracuy River in Venezuela for the production of biofertilizers, nitrogen fixed strains (FBN) and phosphorus-solubilizing strains (SF) were isolated in soils subjected to different management conditions. For this, rizhosferic samples in six different land uses were taken in April, 2010. Sugarcane (Sacharum officinarum), maize (Zea mayz L.), pawpaw (Carica papaya), grass (Brachiaria decumbens) and a forest area were sampled. Bacteria FNVL and SF were isolated using Ashby and Pikoskaya, respectively. Chemical and physical properties were evaluated in all soils to determine the relationship between them and the development of the strains. Results showed that Fn developed better in grass and sugarcane, with 20 and 10 strains respectively, indicating that FNVL strains developed better in uses with low amounts of organic matter or intensive management. The greatest number of SF bacteria was found in land uses with a higher amount of phosphorous (papaya), with 13 colonies, or in uses with adequate physical conditions for the growth of microorganisms (natural forest), with 10 colonies.
A spherical scalar-tensor galaxy model
Jorge L. Cervantes-Cota,Mario A. Rodriguez-Meza,Dario Nunez
Physics , 2009, DOI: 10.1103/PhysRevD.79.064011
Abstract: We build a spherical halo model for galaxies using a general scalar-tensor theory of gravity in its Newtonian limit. The scalar field is described by a time-independent Klein-Gordon equation with a source that is coupled to the standard Poisson equation of Newtonian gravity. Our model, by construction, fits both the observed rotation velocities of stars in spirals and a typical luminosity profile. As a result, the form of the new Newtonian potential, the scalar field, and dark matter distribution in a galaxy are determined. Taking into account the constraints for the fundamental parameters of the theory (lambda,alpha), we analyze the influence of the scalar field in the dark matter distribution, resulting in shallow density profiles in galactic centers.
IMT504: A New and Potent Adjuvant for Rabies Vaccines Permitting Significant Dose Sparing  [PDF]
Alejandro D. Montaner, Analia De Nichilo, Juan M. Rodriguez, Andres Hernando-Insua, Juan Fló, Ricardo A. Lopez, Verónica Sierra, Claudio Paolazzi, Oscar Larghi, David L. Horn, Jorge Zorzopulos, Fernanda Elias
World Journal of Vaccines (WJV) , 2012, DOI: 10.4236/wjv.2012.24025
Abstract: Background: Rabies virus infection causes encephalitis, which is almost always fatal. Vaccination can be extremely effective at preventing disease but is prohibitively costly. Vaccine formulations allowing dose-sparing and fewer inoculations with faster antibody response would be extremely desirable. IMT504, an immunostimulatory non-CpG oligo-deoxynucleotide, is a highly potent vaccine adjuvant. Methods: Human and rat antibody measurements, and rat chal-lenge studies were performed. Results: In rats, highly effective immune responses with IMT504 were observed even after diluting vaccine up to 1/625. In highly lethal, live intracerebral rabies challenge studies, protection occurred even with extremely dilute vaccine plus IMT504. In humans, antibody titers developed faster and were significantly higher with IMT504-adjuvanted diluted vaccine vs non-adjuvanted vaccine (full strength or diluted). All five administered IMT504-adjuvanted diluted vaccine reached protective antibodies (≥0.5 IU/ml) after the second injection. After the third injection, individuals receiving IMT504-adjuvanted diluted vaccine reached levels approximately 10 times higher than controls (M ± SEM: 31.0 ± 10.9 vs 3.40 ± 0.99 IU/ml). Conclusions: These data suggest that IMT504 may allow fewer inoculations, highly significant dose-sparing of vaccine, rapid antibody production and protection from rabies. Extensive clinical studies are necessary to confirm if the use of IMT504 will permit significantly greater access to highly effective life-saving rabies vaccines.
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