O futuro do cooperativismo de leite.

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Zonas de exclusão de algodoeiros transgênicos para preservação de espécies de Gossypium Nativas ou naturalizadas.

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Atividade antimicrobiana de filme e revestimento de quitosana incorporados de nisina sobre bactérias patogênicas.

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Seleção de híbridos de cupuaçuzeiro quanto à capacidade produtiva, desenvolvimento vegetativo e resistência à vassoura-de-bruxa no município de Terra Alta - PA.

O cupuaçuzeiro (Theobroma grandiflorum) é uma das fruteiras amazônicas mais importantes, sendo o estado do Pará o principal produtor. E o mesmo vem enfrentando grandes problemas com material suscetível a vassoura-de-bruxa, levando a queda da produtividade. Esta pesquisa, portanto, veio com objetivo de avaliar a capacidade produtiva, o desenvolvimento vegetativo e a resistência à vassoura-de-bruxa em progênies de cupuaçuzeiro, instaladas em plantio de pequeno produtor rural no município de Terra Alta. O delineamento experimental utilizado foi em blocos casualizados, com 25 progênies de cupuaçuzeiro, cinco repetições e três plantas por parcela. Foram analisadas a altura da planta, diâmetro do caule, produção de frutos e o nível de incidência de vassoura de bruxa na safra 2016/2017. A análise de variância individual realizada no trabalho demonstrou que a progênie 76 apresentou bons valores para altura e diâmetro, porém não diferiu das progênies 58, 60, 64, 69, 72, 76, 88 e 89 para altura. Já para a variável número médio de frutos a melhor resposta foi obtida pela progênie 69, sendo diferenciada de todos os demais materiais. Visando aumento da base genética do cupuaçuzeiro, as progênies 69 e 73 deverão ser incorporadas aos testes de progênies em larga escala no programa de melhoramento do cupuaçuzeiro, desenvolvido pela Embrapa Amazônia Oriental, pois ambas apresentaram boas respostas para todas as variáveis analisadas

Operations of and Future Plans for the Pierre Auger Observatory

Technical reports on operations and features of the Pierre Auger Observatory, including ongoing and planned enhancements and the status of the future northern hemisphere portion of the Observatory. Contributions to the 31st International Cosmic Ray Conference, Lodz, Poland, July 2009.Comment: Contributions to the 31st ICRC, Lodz, Poland, July 200

Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory

The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies $E>E_{th}=5.5\times 10^{19}$ eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at $E>E_{th}$ are heavy nuclei with charge $Z$, the proton component of the sources should lead to excesses in the same regions at energies $E/Z$. We here report the lack of anisotropies in these directions at energies above $E_{th}/Z$ (for illustrative values of $Z=6,\ 13,\ 26$). If the anisotropies above $E_{th}$ are due to nuclei with charge $Z$, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is already significantly larger than that of the fore-runner experiments. Our results do not support previous findings of localized excesses in the AGASA and SUGAR data. We set an upper bound on a point-like flux of cosmic rays arriving from the Galactic Centre which excludes several scenarios predicting sources of EeV neutrons from Sagittarius $A$. Also the events detected simultaneously by the surface and fluorescence detectors (the `hybrid' data set), which have better pointing accuracy but are less numerous than those of the surface array alone, do not show any significant localized excess from this direction.Comment: Matches published versio

Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter

Data collected by the Pierre Auger Observatory through 31 August 2007 showed evidence for anisotropy in the arrival directions of cosmic rays above the Greisen-Zatsepin-Kuz'min energy threshold, \nobreak{$6\times 10^{19}$eV}. The anisotropy was measured by the fraction of arrival directions that are less than $3.1^\circ$ from the position of an active galactic nucleus within 75 Mpc (using the V\'eron-Cetty and V\'eron $12^{\rm th}$ catalog). An updated measurement of this fraction is reported here using the arrival directions of cosmic rays recorded above the same energy threshold through 31 December 2009. The number of arrival directions has increased from 27 to 69, allowing a more precise measurement. The correlating fraction is $(38^{+7}_{-6})$, compared with $21$ expected for isotropic cosmic rays. This is down from the early estimate of $(69^{+11}_{-13})$. The enlarged set of arrival directions is examined also in relation to other populations of nearby extragalactic objects: galaxies in the 2 Microns All Sky Survey and active galactic nuclei detected in hard X-rays by the Swift Burst Alert Telescope. A celestial region around the position of the radiogalaxy Cen A has the largest excess of arrival directions relative to isotropic expectations. The 2-point autocorrelation function is shown for the enlarged set of arrival directions and compared to the isotropic expectation.Comment: Accepted for publication in Astroparticle Physics on 31 August 201