649 research outputs found
The spiny rat Proechimys guyannensis (Rodentia: Echimydae) fails to respond to intradermal inoculation with Leishmania (Viannia) braziliensis
New constraints on H_0 and Omega_M from SZE/X-RAY data and Baryon Acoustic Oscillations
The Hubble constant, , sets the scale of the size and age of the
Universe and its determination from independent methods is still worthwhile to
be investigated. In this article, by using the Sunyaev-Zel`dovich effect and
X-ray surface brightness data from 38 galaxy clusters observed by Bonamente
{\it{et al.}} (2006), we obtain a new estimate of in the context of a
flat CDM model. There is a degeneracy on the mass density parameter
() which is broken by applying a joint analysis involving the
baryon acoustic oscillations (BAO) as given by Sloan Digital Sky Survey (SDSS).
This happens because the BAO signature does not depend on . Our basic
finding is that a joint analysis involving these tests yield km s Mpc and
. Since the hypothesis of spherical geometry
assumed by Bonamente {\it {et al.}} is questionable, we have also compared the
above results to a recent work where a sample of triaxial galaxy clusters has
been considered.Comment: 8 pages, 4 figures, 1 table, accepted version in the general
relativity and gravitatio
Uso do resíduo industrial grits em pavimentos de estradas florestais: influência do período de cura na resistência mecânica e expansão de misturas solo-grits compactadas
Practical Science and Environmental Education Workshop in Manaus, Brazil
It is an unequivocal fact that Amazonian tropical forest is the largest remaining primary forest in the world. The ecosystem in the region is e tremely comple with high biodiversity (Peres et al. 2010). Conservation and protection of the dynamic forest and river regions is e tremely important not only for the natural environments, but also for the economy and social dependence of benefits from such abundant natural environments. Important natural parameters that affect status of the natural environments include light (natural sunlight), soil, and water, which abundantly e ist in the Amazon region. Solar energy is the primary energy source for the majority of living organisms in both terrestrial and aquatic ecosystems, and drives the diurnal and seasonal cycles of biogeochemical processes (Monteith & Unsworth 2013). In particular, in situ light data remains one of the most underappreciated data measurements although having a significant impact on the physical, chemical and biological processes in the ecosystem (Johnsen 2012). Soil provides the fundamental basis for all terrestrial living organisms including the Amazonian forests as well as life-sustaining infrastructure for human society. Water is the most essential single entity to constitute all organisms from a single cell to the earth. Understanding of importance and roles of each factor and interaction of such comple dynamics in the natural environments can serve as fundamental platform for natural scientists, particularly for young scientists such as university students. The objective of this workshop was to provide hand- on scientific and environmental education for university students in Manaus, Amazonas, Brazil through practical field measurements using the three most important parameters in the natural ecosystem composed of natural sunlight, soil, and water. The workshop was divided into a series of lectures, in situ field sampling, and data processing, analysis and interpretation with the ultimate goal of empowering the undergraduate students with research-centered environmental education and e perience of developing international collaboration.departmental bulletin pape
Oviposition preference of the neotropical brown stink bug Euschistus heros on artificial substrates of different colors
Indução à ovulação pelo uso de LHRH análogo e fertilização artificial em rã-touro (Rana catesbeiana)
OBTENÇÃO in vitro DE BROTOS DE Begonia rieger COM THIDIAZURON, CINETINA E ÁCIDO NAFTALENO ACÉTICO
eta-prime photoproduction on the proton for photon energies from 1.527 to 2.227 GeV
Differential cross sections for the reaction gamma p -> eta-prime p have been
measured with the CLAS spectrometer and a tagged photon beam with energies from
1.527 to 2.227 GeV. The results reported here possess much greater accuracy
than previous measurements. Analyses of these data indicate for the first time
the coupling of the etaprime N channel to both the S_11(1535) and P_11(1710)
resonances, known to couple strongly to the eta N channel in photoproduction on
the proton, and the importance of j=3/2 resonances in the process.Comment: 6 pages, 3 figure
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