388 research outputs found
Germinação e incidĂȘncia de fungos em testes com sementes de Brachiaria brizantha Stapf.
The present research was carried out to evaluate the effects of sulphuric acid scarification and fungicide (thiabendazol, captan, thiram and iprodione + thiram) applications on germination tests of B. brizantha and on mycroflora development associated with those tests. In germination tests mycroflora were identified and evaluated on the 10th and the 21st day; at the same time blotter tests were carried out to study the microflora. Interpretations of the results showed that sulphuric acid scarification did not increase significantly the germination but checked fungi development and showed less efficiency than fungicides. Among these the mixture of iprodione and thiram provided the best results. The following fungi were identified: Alternaria tenuis, AspergĂŒlus spp., Cladosporium sp., Curvularia sp., Drechslera spp., Epicoccum sp., Fusarium sp., Neurospora monilia, Penicillium sp., Phoma sp., Rhizopus sp., Trichothecium sp. e Trichoconiella padwikii.O presente trabalho teve por objetivo estudar o efeito da escarifĂcação com ĂĄcido sulfĂșrico e da aplicação de fungicidas (thiabendazol, captan, thiram e iprodione + thiram) nos resultados dos testes de germinação e no desenvolvimento de microrganismos sobre sementes de B. brizantha. AlĂ©m dos testes de germinação, os quais foram avaliados quanto Ă incidĂȘncia de microrganismos aos 10 e 21 dias, conduziram-se testes de sanidade, procurando-se identificar a microflora presente. A anĂĄlise dos dados e interpretação dos resultados permitiram as seguintes conclusĂ”es: a escarificação com o ĂĄcido nĂŁo promoveu acrĂ©scimo significativo na germinação, tendo contribuĂdo para a redução do nĂvel de incidĂȘncia de fungos ao se comparar com a testemunha. Os fungicidas aplicados sobre as sementes escarificadas contribuĂram para uma melhor germinação e para a redução na ocorrĂȘncia de microrganismos, destacando-se a mistura iprodione + thiram. O uso dos fungicidas tambĂ©m facilitou a interpretação dos testes de germinação. Foram encontrados os seguintes fungos: Alternaria tenuis, Aspergillus spp., Cladosporium sp., Curvularia sp., Drechslera sp.p, Epicoccum sp., Fusarium sp., Neurospora monilia, Penicillium sp., Phoma sp., Rhizopus sp., Trichothecium sp. e Trichoconiella padwikii
Huge metastability in high-T_c superconductors induced by parallel magnetic field
We present a study of the temperature-magnetic field phase diagram of
homogeneous and inhomogeneous superconductivity in the case of a
quasi-two-dimensional superconductor with an extended saddle point in the
energy dispersion under a parallel magnetic field. At low temperature, a huge
metastability region appears, limited above by a steep superheating critical
field (H_sh) and below by a strongly reentrant supercooling field (H_sc). We
show that the Pauli limit (H_p) for the upper critical magnetic field is
strongly enhanced due to the presence of the Van Hove singularity in the
density of states. The formation of a non-uniform superconducting state is
predicted to be very unlikely.Comment: 5 pages, 2 figures; to appear in Phys. Rev.
Novos registros de Ephemerelloidea (Insecta: Ephemeroptera) para o estado de SĂŁo Paulo
Phenotypic plasticity of composite beef cattle performance using reaction norms model with unknown covariate
Bagaço de mandioca em dietas de novilhas leiteiras: consumo de nutrientes e desempenho produtivo
New records of Monstrilloida Sars, 1901 (Crustacea: Copepoda) from Rio Grande do Norte (northeastern coast of Brazil)
Avaliação de genótipos de mamoeiro com uso de descritores agronÎmicos e estimação de parùmetros genéticos
Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment
This paper describes an analysis of the angular distribution of W->enu and
W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with
the ATLAS detector at the LHC in 2010, corresponding to an integrated
luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and
the missing transverse energy, the W decay angular distribution projected onto
the transverse plane is obtained and analysed in terms of helicity fractions
f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV
and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw
> 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour,
are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017
+/- 0.030, where the first uncertainties are statistical, and the second
include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables,
revised author list, matches European Journal of Physics C versio
- âŠ