PTF 10bzf (SN 2010ah): A Broad-Line Ic Supernova Discovered by the Palomar Transient Factory

We present the discovery and follow-up observations of a broad-line Type Ic supernova (SN), PTF 10bzf (SN 2010ah), detected by the Palomar Transient Factory (PTF) on 2010 February 23. The SN distance is ≅218 Mpc, greater than GRB 980425/SN 1998bw and GRB 060218/SN 2006aj, but smaller than the other SNe firmly associated with gamma-ray bursts (GRBs). We conducted a multi-wavelength follow-up campaign with Palomar 48 inch, Palomar 60 inch, Gemini-N, Keck, Wise, Swift, the Allen Telescope Array, Combined Array for Research in Millimeter-wave Astronomy, Westerbork Synthesis Radio Telescope, and Expanded Very Large Array. Here we compare the properties of PTF 10bzf with those of SN 1998bw and other broad-line SNe. The optical luminosity and spectral properties of PTF 10bzf suggest that this SN is intermediate, in kinetic energy and amount of ^(56)Ni, between non-GRB-associated SNe like 2002ap or 1997ef, and GRB-associated SNe like 1998bw. No X-ray or radio counterpart to PTF 10bzf was detected. X-ray upper limits allow us to exclude the presence of an underlying X-ray afterglow as luminous as that of other SN-associated GRBs such as GRB 030329 or GRB 031203. Early-time radio upper limits do not show evidence for mildly relativistic ejecta. Late-time radio upper limits rule out the presence of an underlying off-axis GRB, with energy and wind density similar to the SN-associated GRB 030329 and GRB 031203. Finally, by performing a search for a GRB in the time window and at the position of PTF 10bzf, we find that no GRB in the interplanetary network catalog could be associated with this SN

Sinonasal angioleiomyoma with adipocyte differentiation: clinicopathologic study of 2 cases and review of the literature

Angioleiomyoma (ALM) is a benign tumor of the skin and soft tissues composed of well differentiated smooth muscle cells arranged around and among many vascular channels. Few cases have been reported in the sinonasal region, where ALM may show a variable amount of mature adipose tissue that may make hard the distinction from angiomyolipoma. We report here two cases that presented with a three- and six-month history of left nasal obstruction respectively. In both patients, clinical examination and imaging studies failed to reveal features of tuberous sclerosis complex and demonstrated a mass obliterating the nasal cavity arising from the inferior turbinate. Both masses were endoscopically excised. Pathologic analysis revealed highly vascularized tumors composed of well differentiated smooth muscle cells intermingled with a variable number of mature adipocytes. Immunostaining for melanocytic markers was negative. Based on these findings, both tumors were diagnosed as sinonasal-ALM with adipocytic differentiation. These two cases indicate that both clinical data (i.e. absence of features of tuberous sclerosis complex) and immunohistochemistry (i.e. absence of melanocytic markers) are mandatory for the recognition of sinonasal-ALM with adipocytic differentiation. The term angiomyolipoma to identify these lesions is confusing and should be abandoned

Características morfogenéticas e taxa de acúmulo de forragem do Capim-Mombaça submetido a três intervalos de pastejo.

O objetivo deste trabalho foi avaliar características morfogenéticas e a taxa de acúmulo de forragem em pastos de capim-Mombaça submetidos a três intervalos de pastejo (28, 38 e 48 dias) entre outubro de 1995 e setembro de 1996. O delineamento experimentalfoi o de blocos completos ao acaso com arranjo em parcelas subdivididas no tempo. Foram avaliadas as taxas de alongamento e senescênciafoliar, a taxa de alongamento das hastes, a densidade populacional de perfilhos e a altura do pasto. Essas informações permitiram estimara taxa de acúmulo líquido de matéria seca. A taxa de alongamento de hastes e folhas seguiu comportamento estacional, sendo mais elevadanos meses de maior temperatura e precipitação. A taxa de senescência foliar foi maior com 48 dias de intervalo de pastejo e praticamentenula entre maio e setembro. O cultivar Mombaça deve ser pastejado com, aproximadamente, 28 dias no período de outubro a maio e 48dias entre maio e setembro. O manejo do capim-Mombaça não pode ser orientado apenas pelos valores de taxa de acúmulo de matériaseca, sendo necessários estudos sobre as perdas de pastejo e sobre os efeitos da presença das hastes na eficiência de pastejo, consumoe qualidade de forragem, a fim de se determinar melhor o manejo deste capim

Recuperação de pastagens degradadas para sistemas intensivos de produção de bovinos.

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Correlação do solo e fertilização de pastagens em sistemas intensivos de produção de leite.

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Correção do solo e fertilização de pastagens em sistemas intensivos de produção de leite

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GRB 970228 Within the EMBH Model

We consider the gamma-ray burst of 1997 February 28 (GRB 970228) within the ElectroMagnetic Black Hole (EMBH) model. We first determine the value of the two free parameters that characterize energetically the GRB phenomenon in the EMBH model, that is to say the dyadosphere energy, $E_{dya}=5.1\times10^{52}$ ergs, and the baryonic remnant mass $M_{B}$ in units of $E_{dya}$, $B=M_{B}c^{2}/E_{dya}=3.0\times10^{-3}$. Having in this way estimated the energy emitted during the beam-target phase, we evaluate the role of the InterStellar Medium (ISM) number density (n$_{ISM}$) and of the ratio ${\cal R}$ between the effective emitting area and the total surface area of the GRB source, in reproducing the observed profiles of the GRB 970228 prompt emission and X-ray (2-10 keV energy band) afterglow. The importance of the ISM distribution three-dimensional treatment around the central black hole is also stressed in this analysis.Comment: 4 pages, 1 figure, to appear in the Proceedings of the Los Alamos "Gamma Ray Burst Symposium" in Santa Fe, New Mexico, September 8-12 2003 (AIP Conf. Ser.), CHAPTER: GRB Connection to Supernova

Pastagens irrigadas.

Pastagens irrigadas; Disponibilidade de água para irrigação; Irrigação de pastagens nos sistemas de produção; Qualidade da forragem irrigada ao londo do ano e desempenho animal; Eficiência de uso da forragem com altas massas de forragem; Planejamento de sistemas irrigados; Análise econômica