702 research outputs found

    MAPEO DE LA DISTRIBUCIÓN ESPACIAL DE TRIPS (INSECTA: THYSANOPTERA) EN PARCELAS COMERCIALES DE AGUACATE VAR. HASS EN COATEPEC HARINAS ESTADO DE MÉXICO

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    SE ESTABLECIÓ LA DISTRIBUCIÓN ESPACIAL DE LOS TRIPS EN CULTIVO DE AGUACATE EN UNA LOCALIDAD DEL ESTADO DE MÉXICO.El presente estudio permitió conocer la distribución espacial de trips mediante mapas de densidad en tres parcelas comerciales de aguacate VarHass en Coatepec Harinas, Estado de México. Los resultados mostraron que para el periodo comprendido de julio a diciembre de 2015, la distribución espacial de trips se ajustó a modelos gaussianos en su totalidad con una superficie infestada que osciló entre el 90 y 100% mostrando undistribución espacial agregada; el efecto pepita obtenido para todos los muestreos corroboró la agregación de las poblaciones de trips y refiere umínimo error de muestreo para los doce muestreos realizados. Trabajos como este, en que se aplican métodos geoestadísticos, coadyuvan al conocimiento de los problemas fitosanitarios de los cultivos de importancia económica y a la aplicación de medidas de control (químico, biológicocultural o mecánico) dirigidas a zonas específicas de la parcela

    Adherence to the physical activity guideline beyond the recommended minimum weekly amount: impacts on indicators of physical function in older adults

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    IntroductionThe extent to which additional health benefits of accumulating twice the minimum amount of time in moderate-to-vigorous physical activity (MVPA) affects indicators of physical function in older adults is unclear. Therefore, the aim of the present study was to assess indicators of physical function in older adults who accumulate at least 150 but less than 300 min/week of MVPA compared to those accumulating at least 300 min/week.MethodsIndicators of physical function, including handgrip strength, 5 times sit-to-stand test (5-STS), squat jump and 6-min walk test (6MWT) were assessed in a sample of 193 older men (n = 71, 67 ± 2 years), and women (n = 122, 67 ± 2 years), who all accumulated at least 150 weekly minutes of MVPA. Time in MVPA was assessed by accelerometry during 1 week and engagement in muscle strengthening activities (MSA) was assessed by self-report. Protein intake was assessed by a food-frequency-questionnaire. Participants were classified as physically active (≥150 but <300 min of MVPA per week) or as highly physically active (≥300 min of MVPA per week).ResultsFactorial analysis of variance revealed that older adults accumulating at least 300 min of MVPA per week had a significantly (p < 0.05) better 6MWT performance and overall physical function compared to the less active group. These findings remained significant after further adjustment for MSA, sex, waist circumference and protein intake. In contrast, no significant differences in indicators of muscle strength were observed between the two groups.DiscussionAdherence to twice the recommended minimum amount of weekly MVPA time is related to a better physical function, evidenced by a better walking performance compared to adherence to the minimum weekly amount of MVPA. This finding emphasizes the benefits of accumulating daily MVPA beyond the minimum recommended amount to optimize the ability to perform activities of daily living, thus reducing the burden of physical disability and related health-care costs

    Distribución espacial de trips spp. (thysanoptera) y evaluación de su control mediante el depredador a Mblyseius swirskii en el cultivo de aguacate en México

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    SE LOGRO DETERMINAR LA DISTRIBUCIÓN ESPACIAL DE LAS POBLCIONES DE TRIPS Y SE ESTABLECIÓ LA EFICIENCIA DE Amblyseius swirskii COMO BIOCONTROLADOR.El uso de diferentes alternativas en el control de plagas y enfermedades es de gran importancia en la elaboración de programas de manejo integrado. El presente estudio se realizó con el fin de conocer la distribución espacial de trips y la efectividad del depredador Amblyseius swirskii que tiene sobre sus poblaciones en el cultivo de aguacate. Se determinó la distribución espacial de la plaga, también se determinó el semivariograma experimental y se obtuvieron los mapas de agregación de la plaga. Se determinó que existe infestación en las tres parcelas y para la mayoría de los meses al 100 por ciento, se realizó una prueba estadística para conocer si existen diferencias significativas a partir de la liberación del depredador, existe reducción de las poblaciones donde existe la liberación del depredador el cual se observa en los promedios de infestación y en los mapas de agregación de la plaga, con lo anterior conocemos la distribución de la plaga lo cual nos ayuda a implementar métodos focalizados de control integrado y obtener ahorros económicos, así como también conocemos otro método para el control del trips

    Estabilidad espacial y temporal de la distribución de TRIPS en el cultivo de aguacate en el Estado de México

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    SE DETERMINÓ LA ESTABILIDAD ESPACIAL Y TEMPORAL DE LA DISTRIBUCIÓN DE LAS POBLACIONES DE TRIPS EN EL CULTIVO DE AGUACATE EN EL ESTADO DE MÉXICO.El uso excesivo e inadecuado de plaguicidas ha causado graves daños al ambiente y a la salud humana; por ello la utilización de nuevas técnicas que coadyuven a mitigar los impactos generados han tomado importancia durante los últimos años. De esta manera se realizan trabajos enfocados en la planeación y muestreo sistematizado de plagas, los cuales tienen como propósito proveer la información necesaria que permita el uso adecuado de plaguicidas y esto dé pie a la generación de una agricultura más sustentable. Los trips son insectos que causan graves daños en las huertas del cultivo de aguacate en el municipio de Coatepec Harinas, Estado de México, y otros estados productores de este fruto, por ello, el estudio se realizó con el objetivo de analizar la estabilidad espacio temporal de trips con el índice de SADIE y la prueba de Cramér-von Mises, así como la modelización espacial de trips. Los resultados muestran que la geoestadística y el SADIE lograron establecer patrones espaciales de trips y determinar su estabilidad espaciotemporal. En los mapas de cada muestreo pueden ser visualizados diversos centros de agregación, lo que puede poner en marcha acciones preventivas hacia determinados puntos de incidencia de trips como la aplicación de insecticidas a árboles o área de las parcelas con infestaciones mayores

    Estabilidad Espacial y Temporal de la Distribución de Trips 1 en el Cultivo de Aguacate en el Estado de México

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    El uso excesivo e inadecuado de plaguicidas ha causado graves daños al ambiente y a la salud humana; por ello la utilización de nuevas técnicas que coadyuven a mitigar los impactos generados han tomado importancia durante los últimos años. De esta manera se realizan trabajos enfocados en la planeación y muestreo sistematizado de plagas, los cuales tienen como propósito proveer la información necesaria que permita el uso adecuado de plaguicidas y esto dé pie a la generación de una agricultura más sustentable. Los trips son insectos que causan graves daños en las huertas del cultivo de aguacate en el municipio de Coatepec Harinas, Estado de México, y otros estados productores de este fruto, por ello, el estudio se realizó con el objetivo de analizar la estabilidad espacio temporal de trips con el índice de SADIE y la prueba de Cramér-von Mises, así como la modelización espacial de trips. Los resultados muestran que la geoestadística y el SADIE lograron establecer patrones espaciales de trips y determinar su estabilidad espaciotemporal. En los mapas de cada muestreo pueden ser visualizados diversos centros de agregación, lo que puede poner en marcha acciones preventivas hacia determinados puntos de incidencia de trips como la aplicación de insecticidas a árboles o área de las parcelas con infestaciones mayores

    Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm{NN}}} = 2.76 TeV

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    The inclusive transverse momentum (pTp_{\rm T}) distributions of primary charged particles are measured in the pseudo-rapidity range η<0.8|\eta|<0.8 as a function of event centrality in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm{NN}}}=2.76 TeV with ALICE at the LHC. The data are presented in the pTp_{\rm T} range 0.15<pT<500.15<p_{\rm T}<50 GeV/cc for nine centrality intervals from 70-80% to 0-5%. The Pb-Pb spectra are presented in terms of the nuclear modification factor RAAR_{\rm{AA}} using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pTp_{\rm T} particles strongly depends on event centrality. In central collisions (0-5%) the yield is most suppressed with RAA0.13R_{\rm{AA}}\approx0.13 at pT=6p_{\rm T}=6-7 GeV/cc. Above pT=7p_{\rm T}=7 GeV/cc, there is a significant rise in the nuclear modification factor, which reaches RAA0.4R_{\rm{AA}} \approx0.4 for pT>30p_{\rm T}>30 GeV/cc. In peripheral collisions (70-80%), the suppression is weaker with RAA0.7R_{\rm{AA}} \approx 0.7 almost independently of pTp_{\rm T}. The measured nuclear modification factors are compared to other measurements and model calculations.Comment: 17 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/284

    Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at sNN\sqrt{s_{NN}} = 5.02 TeV

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    Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum range 0.7 <pT,assoc<pT,trig< < p_{\rm{T}, assoc} < p_{\rm{T}, trig} < 5.0 GeV/cc is examined, to include correlations induced by jets originating from low momen\-tum-transfer scatterings (minijets). The correlations expressed as associated yield per trigger particle are obtained in the pseudorapidity range η<0.9|\eta|<0.9. The near-side long-range pseudorapidity correlations observed in high-multiplicity p-Pb collisions are subtracted from both near-side short-range and away-side correlations in order to remove the non-jet-like components. The yields in the jet-like peaks are found to be invariant with event multiplicity with the exception of events with low multiplicity. This invariance is consistent with the particles being produced via the incoherent fragmentation of multiple parton--parton scatterings, while the yield related to the previously observed ridge structures is not jet-related. The number of uncorrelated sources of particle production is found to increase linearly with multiplicity, suggesting no saturation of the number of multi-parton interactions even in the highest multiplicity p-Pb collisions. Further, the number scales in the intermediate multiplicity region with the number of binary nucleon-nucleon collisions estimated with a Glauber Monte-Carlo simulation.Comment: 23 pages, 6 captioned figures, 1 table, authors from page 17, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/161

    Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}}=2.76 TeV

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    The elliptic, v2v_2, triangular, v3v_3, and quadrangular, v4v_4, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}} = 2.76 TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range η<0.8|\eta|<0.8 at different collision centralities and as a function of transverse momentum, pTp_{\rm T}, out to pT=20p_{\rm T}=20 GeV/cc. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for pT>8p_{\rm T}>8 GeV/cc. The small pTp_{\rm T} dependence of the difference between elliptic flow results obtained from the event plane and four-particle cumulant methods suggests a common origin of flow fluctuations up to pT=8p_{\rm T}=8 GeV/cc. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least pT=8p_{\rm T}=8 GeV/cc indicating that the particle type dependence persists out to high pTp_{\rm T}.Comment: 16 pages, 5 captioned figures, authors from page 11, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/186

    Multi-particle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

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    Measurements of multi-particle azimuthal correlations (cumulants) for charged particles in p-Pb and Pb-Pb collisions are presented. They help address the question of whether there is evidence for global, flow-like, azimuthal correlations in the p-Pb system. Comparisons are made to measurements from the larger Pb-Pb system, where such evidence is established. In particular, the second harmonic two-particle cumulants are found to decrease with multiplicity, characteristic of a dominance of few-particle correlations in p-Pb collisions. However, when a Δη|\Delta \eta| gap is placed to suppress such correlations, the two-particle cumulants begin to rise at high-multiplicity, indicating the presence of global azimuthal correlations. The Pb-Pb values are higher than the p-Pb values at similar multiplicities. In both systems, the second harmonic four-particle cumulants exhibit a transition from positive to negative values when the multiplicity increases. The negative values allow for a measurement of v2{4}v_{2}\{4\} to be made, which is found to be higher in Pb-Pb collisions at similar multiplicities. The second harmonic six-particle cumulants are also found to be higher in Pb-Pb collisions. In Pb-Pb collisions, we generally find v2{4}v2{6}0v_{2}\{4\} \simeq v_{2}\{6\}\neq 0 which is indicative of a Bessel-Gaussian function for the v2v_{2} distribution. For very high-multiplicity Pb-Pb collisions, we observe that the four- and six-particle cumulants become consistent with 0. Finally, third harmonic two-particle cumulants in p-Pb and Pb-Pb are measured. These are found to be similar for overlapping multiplicities, when a Δη>1.4|\Delta\eta| > 1.4 gap is placed.Comment: 25 pages, 11 captioned figures, 3 tables, authors from page 20, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/87

    Charge separation relative to the reaction plane in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}}= 2.76 TeV

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    Measurements of charge dependent azimuthal correlations with the ALICE detector at the LHC are reported for Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}} = 2.76 TeV. Two- and three-particle charge-dependent azimuthal correlations in the pseudo-rapidity range η<0.8|\eta| < 0.8 are presented as a function of the collision centrality, particle separation in pseudo-rapidity, and transverse momentum. A clear signal compatible with a charge-dependent separation relative to the reaction plane is observed, which shows little or no collision energy dependence when compared to measurements at RHIC energies. This provides a new insight for understanding the nature of the charge dependent azimuthal correlations observed at RHIC and LHC energies.Comment: 12 pages, 3 captioned figures, authors from page 2 to 6, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/286
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