Ecoturismo no Pantanal.

Esta publicação teve como objetivo principal fornecer mais uma ferramenta de apoio aos interessados no ecoturismo. Ela apresenta uma visão bastante ampla sobre o tema abordado, que abrange as questões gerais envolvidas no ecoturismo, como o planejamento racional relativo à implantação de programas de ecoturismo, as noções sobre o uso da fauna, dos recursos pesqueiros e da biodiversidade, e o manejo e criação sustentável de animais selvagens. Os capítulos deste livro são compostos por palestras que foram apresentadas durante o I Workshop sobre Desenvolvimento e Consolidação do Ecoturismo da Região de Aquidauana, realizado em Aquidauana, MS, no período de 26 a 27 de abril de 2003.CATELLA, A. C.; TOMBINI, A. A. de M.; PRADO, A. C. de A.; BÉDA, A. F.; LEITE, A.; ROCHA, F. L.; LEITE, F. L. G.; MOURÃO, G.; ROSSI JUNIOR, J. L.; RIBEIRO, L.; ROOS, M. C.; MARIANI, M. A. P.; SILVA NETO, P. B.; SOUZA, R. de.; PAULA, T. A. R. de.; PIOVEZAN, U.; FERREIRA, V. L. Formato Documento Eletrônico

Effect of an extract of Centella asiatica on the biodistribution of sodium pertechnetate (Na^99mTcO₄) and on the fixation of radioactivity on blood constituents

This study evaluates the effects of an acute treatment with a Centella asiatica (CA) extract on the biodistribution of the radiopharmaceutical Na99mTcO4 and on the fixation of technetium-99m on blood constituents. Wistar rats were treated with CA extract and, 1 hour after, Na99mTcO4 was administered; organs/tissues were withdrawn and weighted. The radioactivity was counted to calculate the percentage of activity per gram (%ATI/g). Also, blood samples were withdrawn, plasma (P), blood cells (BC), insoluble fraction (IF) and soluble fractions of P and BC were isolated and the radioactivity was counted to calculate the percentage of activity (%ATI). Data indicated that the acute treatment with CA extract changed significantly (p99mTcO4 and the fixation of the technetium-99m on blood constituents in an acute treatment

Recent developments and proposed schemes for trapped ion frequency standards

Ion traps are exciting candidates as future precision frequency sources. Recent developments demonstrate that mercury ion frequency standards are capable of a stability performance comparable to commercial cesium standards. There is, however, considerable room for improvement with regard to the signal to noise problem. The 40 GHz microwave frequency implies that a careful design should be implemented to ensure the elimination of the unwanted side bands in the microwave pump signal. A long life, high performance light source to be used in a trapped mercury ion microwave standard must be developed and the long term performance of a trapped mercury ion microwave standard must be investigated. While newly proposed two photon pumping schemes in conjuction with mercury ions promise exciting developments for both microwave and optical frequency standards, other ions that may be potential candidates should be evaluated for their usefulness

Cosmology in the Universe with distance dependent Lorentz-violating bakground

We consider a cosmological setup with the inflaton field in the presence of a redshift dependent Lorentz-violating time-like background to address the inflationary regime and other phases of the Universe. We also show that the regime of dark energy at large distances (low redshifts) is essentially dominated by the presence of the Lorentz-violating background.Comment: 8 pages, no figure, Latex, to appear in AHE