172 research outputs found
Registro de isolados de Sida yellow net vírus associados a plantas de tomateiro no Estado do Rio de Janeiro, Brasil.
Resumo 847-1. Na publicação: BOITEUX, M. E. D. N. F
A taxonomic revision of the Neotropical termite genera Labiotermes Holmgren and Paracornitermes Emerson (Isoptera: Termitidae: Nasutitermitinae)
The taxonomy of the South American termite genus Labiotermes Holmgren (sensu novo) is revised,including identification keys to soldiers and workers, and distribution maps for all 10 species.Paracornitermes Emerson is treated as a new synonym of Labiotermes. Two new species aredescribed: L. guasu, from the Amazon rain forest and L. oreadicus, from the Cerrado of centralBrazil. Paracornitermes caapora Bandeira & Cancello and P. hirsutus Araujo are placed under thesynonymy of L. orthocephalus. The imagos of L. emersoni and L. orthocephalus are described forthe first time. The workers of all species are described and illustrated, including the enteric valve armature and the mixed segment. The soldiers of the species previously included inParacornitermes are redescribed.Fil: Constantino, Reginaldo. Universidade de Brasília; BrasilFil: Acioli, Agmo N. S.. PPG Entomologia; BrasilFil: Smith, Karen. Universidade de Brasília; BrasilFil: Cuezzo, Adriana Carolina. Fundación Miguel Lillo. Dirección de Zoología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; ArgentinaFil: Carvalho, Sergio H. C. Universidade de Brasília; BrasilFil: Vasconcellos, Alexandre. Universidade Federal do Rio Grande do Norte; Brasi
Sequência completa do DNA-A de uma nova espécie de Begomovirus infectando tomateiro no Estado de Tocantins, Brasil.
O presente trabalho visou caracterizar uma nova espécie de Begomovirus detectada infectando tomateiro (Solanum lycopersicum L.) no Estado de Tocantins.Resumo 1381. Suplemento. Edição dos resumos do 44º Congresso Brasileiro de Fitopatologia, 2011, Bento Gonçalves
Registro no Estado do Amazonas de um novo begomovírus do tomateiro relacionado com espécies virais da América Central e Caribe.
Esse trabalho visou caracterizar um isolado de Begomovirus encontrado infectando tomateiro no Estado do Amazonas. Plantas com sintomas de clorose interneral e amarelecimento apical foram coletadas na região produtora de tomate para consumo in natura em Silves-AM.Resumo 1382. Suplemento. Edição dos resumos do 44º Congresso Brasileiro de Fitopatologia, 2011, Bento Gonçalves
Correlation energy of a two-dimensional electron gas from static and dynamic exchange-correlation kernels
We calculate the correlation energy of a two-dimensional homogeneous electron
gas using several available approximations for the exchange-correlation kernel
entering the linear dielectric response of the system.
As in the previous work of Lein {\it et al.} [Phys. Rev. B {\bf 67}, 13431
(2000)] on the three-dimensional electron gas, we give attention to the
relative roles of the wave number and frequency dependence of the kernel and
analyze the correlation energy in terms of contributions from the plane. We find that consistency of the kernel with the electron-pair
distribution function is important and in this case the nonlocality of the
kernel in time is of minor importance, as far as the correlation energy is
concerned. We also show that, and explain why, the popular Adiabatic Local
Density Approximation performs much better in the two-dimensional case than in
the three-dimensional one.Comment: 9 Pages, 4 Figure
Correlation energies of inhomogeneous many-electron systems
We generalize the uniform-gas correlation energy formalism of Singwi, Tosi,
Land and Sjolander to the case of an arbitrary inhomogeneous many-particle
system. For jellium slabs of finite thickness with a self-consistent LDA
groundstate Kohn-Sham potential as input, our numerical results for the
correlation energy agree well with diffusion Monte Carlo results. For a helium
atom we also obtain a good correlation energy.Comment: 4 pages,1 figur
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