Sistemática dos Mysidacea (crustácea) na região de Cananéia

Mysids collected at Cananéia region (Lat. 25º04'S -25º58'S and Long. 047º54'W -047º57'W) during the period Sept. 1969 - Sept. 1970 have been systematically studied. The following species are redescribed and figured: Bowmaniella (Coifmanniella) brasiliensis Mysidopsis tortonesi, M. eoelhoi, Brasilomysis castroi Metamysidopsis elongata atlantica and Promysis atlantica. The diagnoses are based on characters easily observed and useful to their identification. The geographic distribution is given for all species studied in addition to the zoogeographical distribution of mysids from Brazilian shallow waters

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

The Fluorescence Detector of the Pierre Auger Observatory

The Pierre Auger Observatory is a hybrid detector for ultra-high energy cosmic rays. It combines a surface array to measure secondary particles at ground level together with a fluorescence detector to measure the development of air showers in the atmosphere above the array. The fluorescence detector comprises 24 large telescopes specialized for measuring the nitrogen fluorescence caused by charged particles of cosmic ray air showers. In this paper we describe the components of the fluorescence detector including its optical system, the design of the camera, the electronics, and the systems for relative and absolute calibration. We also discuss the operation and the monitoring of the detector. Finally, we evaluate the detector performance and precision of shower reconstructions.Comment: 53 pages. Submitted to Nuclear Instruments and Methods in Physics Research Section

Search for First Harmonic Modulation in the Right Ascension Distribution of Cosmic Rays Detected at the Pierre Auger Observatory

We present the results of searches for dipolar-type anisotropies in different energy ranges above $2.5\times 10^{17}$ eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% $C.L.$ for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations.Comment: 28 pages, 11 figure

Comportamento ingestivo diurno de novilhos Nelore recebendo níveis crescentes de suplementação em pastejo de capim-braquiária

Objetivou-se avaliar o comportamento ingestivo diurno de novilhos em pastagem de capim-braquiária submetidos a suplementação energética e proteica. Foram utilizados 40 novilhos Nelore, com peso inicial de 373,7 ± 14,9 kg e 26 meses de idade, distribuídos em quatro níveis de suplementação: mistura mineral, 0,3; 0,6 e 0,9% do peso vivo de suplementação energética e proteica. Os animais foram observados visualmente por dois períodos de 12 horas; das 6 às 18 h. Os tempos de pastejo, ruminação e ócio sofreram efeito quadrático, e o tempo de cocho efeito linear crescente. Os consumos de matéria seca total não foram alterados pelos níveis de suplementação. O consumo total de matéria seca oriunda da pastagem e todas variáveis relacionadas à fibra em detergente neutro e fibra em detergente ácido decresceram linearmente. O número de mastigações por bolo decresceu linearmente. O número de períodos de pastejo e o tempo por período de cocho aumentaram linearmente. O tempo por período de pastejo decresceu linearmente. O número de períodos de ruminação, número de períodos de ócio e tempo por período de ruminação sofreram efeito quadrático. O número de períodos de cocho sofreu efeito cúbico. A suplementação compromete as variáveis relacionadas ao comportamento ingestivo diurno, não só pela quantidade de alimento ingerido, mas também por sua composição e pela razão volumoso:concentrado, portanto, exige atenção no balanceamento de rações.The objective this study was to evaluate the diurnal ingestive behavior of Nellore steers on Brachiaria grass pasture submitted to protein and energy supplementation. It was used 40 Nellore steers, at initial weight of 373.7 ± 14.9 kg, and at 26 months of age, distributed in four levels of supplementation:mineral mixture, 0.3, 0.6 and 0.9% of body weight of energy and protein supplementation. The animals were visually observed by two 12-hour periods from 6:00 a.m. to 06:00 p.m. Grazing, ruminating and idle times had a quadratic effect and the trough time had a linear increase effect. The total dry matter intakes were not affected by the supplementation levels. Total consumption of dry matter from pasture and all the variables related to neutral detergent fiber and acid detergent fiber decreased linearly. The number of chews per bolus linearly decreased. The number of grazing periods and time for feed period increased linearly. The time for grazing period decreased linearly. The number of ruminating periods, number of idle periods and time for rumination period suffered a quadratic effect. The number of trough periods suffered a cubical effect. Supplementation compromises the variables related to diurnal ingestive behavior, not only because of the quantity of ingested food but also because of its composition and because of the roughage:concentrate ratio, therefore, attention on meal balance is required