Caracterización de endófitos simbióticos aislados de leguminosas nativas de la Amazonía peruana

Se aisló y determino la capacidad infectiva y efectiva en FBN de 10 cepas endófitas, de tres especies de leguminosas (macrosimbiontes): Inga edulis C. Mart.; Desmodium adscendens (Sw.) DC.; Ormosia coccinea (Aubl.) Jacks., aisladas de bosques primarios, secundarios e intervenidos. De las 10 cepas aisladas se logró identificar genotípicamente 06. Las 10 cepas aisladas (microsimbiontes) fueron inoculadas en sus respectivos tratamientos (macrosimbiontes) en condiciones controladas, reportándose infectividad (nódulos) en 4 de estos. Se registró diferencia significativa en las cepas IeBS-C1 y IeBS-C2 frente al control empleado, pero ambas tienen la misma efectividad (CFN) con o sin la presencia de los endófitos simbióticos. Se registró diferencia significativa en las cepas IeBI-C1 y IeBI-C2 frente al control empleado, porque ambas tienen mejor efectividad (CFN) con la presencia de los endófitos simbióticos. No se registró diferencia significativa en las cepas DaBS-C1, DaBs-C2, DaBI-C1 y DaBI-C2 frente al control empleado, todas tienen la misma efectividad (CFN) con o sin la presencia de los endófitos simbióticos

Factores Socioeconómicos Asociados a la Presencia de Malaria por Plasmodium Vivax en la Comunidad de Zungarococha, Iquitos, 2018

A study was conducted to determine the relationship between socioeconomic factors and the presence of malaria in the population of the community of Zungarococha during 2018. The present research was quantitative and the design was: non-experimental, transversal, descriptive and correlational. To obtain the sample, a simple probabilistic sampling was used and the interview technique with the survey was used as an instrument. For the analysis and interpretation of the results, the non-parametric free distribution test of Pearson Chi square categorical variables (X2) was chosen. A significant relationship was found between social factors (sex, age, marital status and degree of education) and economic (type of occupation, type of housing and average monthly income) with Plasmodium vivax malaria, but only male people are predictors, ages ranging from 18 to 24 years old, single, who live in a House made with materials other than noble and rustic materials, and whose monthly income is less than 930 soles.Se realizó un estudio para determinar la relación existente entre los factores socioeconómicos y la presencia de malaria en la población de la comunidad de Zungarococha durante el año 2018. La presente investigación fue de tipo cuantitativa y el diseño fue: no experimental, transversal, descriptivo y correlacional. Para obtener la muestra se utilizó un muestreo probabilístico simple y se utilizó la técnica de entrevista con la encuesta como instrumento. Para el análisis e interpretación de los resultados se eligió la prueba no paramétrica de libre distribución de variables categóricas Chi cuadrado de Pearson (X2). Se encontró relación significativa entre factores sociales (sexo, edad, estado civil y grado de instrucción) y económicos (tipo de ocupación, tipo de vivienda e ingreso promedio mensual) con la malaria por Plasmodium vivax, pero solo son predictores las personas de sexo masculino, cuyas edades oscilan entre 18 a 24 años, solteros, que viven en una Vivienda hecha con materiales distintos al material noble y rústicos, y cuyos ingresos mensuales son menores a 930 soles

Observation of Coherent Elastic Neutrino-Nucleus Scattering

The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross-section is the largest by far of all low-energy neutrino couplings. This mode of interaction provides new opportunities to study neutrino properties, and leads to a miniaturization of detector size, with potential technological applications. We observe this process at a 6.7-sigma confidence level, using a low-background, 14.6-kg CsI[Na] scintillator exposed to the neutrino emissions from the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. Characteristic signatures in energy and time, predicted by the Standard Model for this process, are observed in high signal-to-background conditions. Improved constraints on non-standard neutrino interactions with quarks are derived from this initial dataset

First Measurement of Coherent Elastic Neutrino-Nucleus Scattering on Argon

We report the first measurement of coherent elastic neutrino-nucleus scattering (\cevns) on argon using a liquid argon detector at the Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer \cevns over the background-only null hypothesis with greater than $3\sigma$ significance. The measured cross section, averaged over the incident neutrino flux, is (2.2 $\pm$ 0.7) $\times$10$^{-39}$ cm$^2$ -- consistent with the standard model prediction. The neutron-number dependence of this result, together with that from our previous measurement on CsI, confirms the existence of the \cevns process and provides improved constraints on non-standard neutrino interactions.Comment: 8 pages, 5 figures with 2 pages, 6 figures supplementary material V3: fixes to figs 3,4 V4: fix typo in table 1, V5: replaced missing appendix, V6: fix Eq 1, new fig 3, V7 final version, updated with final revision

A Study of Muon Neutrino Disappearance Using the Fermilab Main Injector Neutrino Beam

We report the results of a search for muon-neutrino disappearance by the Main Injector Neutrino Oscillation Search. The experiment uses two detectors separated by 734 km to observe a beam of neutrinos created by the Neutrinos at the Main Injector facility at Fermi National Accelerator Laboratory. The data were collected in the first 282 days of beam operations and correspond to an exposure of 1.27e20 protons on target. Based on measurements in the Near Detector, in the absence of neutrino oscillations we expected 336 +/- 14 muon-neutrino charged-current interactions at the Far Detector but observed 215. This deficit of events corresponds to a significance of 5.2 standard deviations. The deficit is energy dependent and is consistent with two-flavor neutrino oscillations according to delta m-squared = 2.74e-3 +0.44/-0.26e-3 eV^2 and sin^2(2 theta) > 0.87 at 68% confidence level.Comment: In submission to Phys. Rev.

Measurement of the Atmospheric Muon Charge Ratio at TeV Energies with MINOS

The 5.4 kton MINOS far detector has been taking charge-separated cosmic ray muon data since the beginning of August, 2003 at a depth of 2070 meters-water-equivalent in the Soudan Underground Laboratory, Minnesota, USA. The data with both forward and reversed magnetic field running configurations were combined to minimize systematic errors in the determination of the underground muon charge ratio. When averaged, two independent analyses find the charge ratio underground to be 1.374 +/- 0.004 (stat.) +0.012 -0.010(sys.). Using the map of the Soudan rock overburden, the muon momenta as measured underground were projected to the corresponding values at the surface in the energy range 1-7 TeV. Within this range of energies at the surface, the MINOS data are consistent with the charge ratio being energy independent at the two standard deviation level. When the MINOS results are compared with measurements at lower energies, a clear rise in the charge ratio in the energy range 0.3 -- 1.0 TeV is apparent. A qualitative model shows that the rise is consistent with an increasing contribution of kaon decays to the muon charge ratio.Comment: 16 pages, 17 figure

Measurement of neutrino velocity with the MINOS detectors and NuMI neutrino beam

The velocity of a ~3 GeV neutrino beam is measured by comparing detection times at the near and far detectors of the MINOS experiment, separated by 734 km. A total of 473 far detector neutrino events was used to measure (v-c)/c=5.12.910-5 (at 68% C.L.). By correlating the measured energies of 258 charged-current neutrino events to their arrival times at the far detector, a limit is imposed on the neutrino mass of mnu<50 MeV/c2 (99% C.L.)

First observations of separated atmospheric nu_mu and bar{nu-mu} events in the MINOS detector

The complete 5.4 kton MINOS far detector has been taking data since the beginning of August 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. This paper presents the first MINOS observations of nuµ and [overline nu ]µ charged-current atmospheric neutrino interactions based on an exposure of 418 days. The ratio of upward- to downward-going events in the data is compared to the Monte Carlo expectation in the absence of neutrino oscillations, giving Rup/downdata/Rup/downMC=0.62-0.14+0.19(stat.)±0.02(sys.). An extended maximum likelihood analysis of the observed L/E distributions excludes the null hypothesis of no neutrino oscillations at the 98% confidence level. Using the curvature of the observed muons in the 1.3 T MINOS magnetic field nuµ and [overline nu ]µ interactions are separated. The ratio of [overline nu ]µ to nuµ events in the data is compared to the Monte Carlo expectation assuming neutrinos and antineutrinos oscillate in the same manner, giving R[overline nu ][sub mu]/nu[sub mu]data/R[overline nu ][sub mu]/nu[sub mu]MC=0.96-0.27+0.38(stat.)±0.15(sys.), where the errors are the statistical and systematic uncertainties. Although the statistics are limited, this is the first direct observation of atmospheric neutrino interactions separately for nuµ and [overline nu ]µ