2,181 research outputs found
Wave Equations for Classical Two-Component Proca Fields in Curved Spacetimes with Torsionless Affinities
The world formulation of the full theory of classical Proca fields in
generally relativistic spacetimes is concisely reviewed and the entire set of
pertinent field equations is transcribed in a straightforward way into the
framework of one of the Infeld-van der Waerden formalisms. Some well-known
calculational techniques are then utilized for deriving the wave equations that
control the propagation of the fields allowed for. It appears that no
interaction couplings between such fields and electromagnetic curvatures are
carried by the wave equations at issue. What results is, in effect, that the
only interactions which ultimately occur in the theoretical context under
consideration involve strictly Proca fields and wave functions for gravitons.Comment: Many improvements on the paper have still been made. In particular,
its title has been modified so as to conform further to one of its main aim
Agricultura sem fogo na Amazônia Oriental: formiga como indicador agroecológico.
Edição dos Anais do XVIII Simpósio de Mirmecologia, São Paulo, 2007
Estudo da viabilidade prática e econômica do adensamento do plantio, associado com a erradicação sistemática de plantas de maracujazeiro com sintomas de mosaico, no controle do vírus do endurecimento dos frutos no estado do Pará.
Controle de doenças do maracujazeiro através do uso de produtos alternativos.
Publicado também em: Fitopatologia Brasileira, v. 30, p. S59, ago. 2005. Suplemento. Resumos do XXXVIII Congresso Brasileiro de Fitopatologia
Constatação de Curvularia eragrostides em mudas de dendÛ no Estado do Pará.
Resumos do XXXVIII Congresso Brasileiro de Fitopatologia. Resumo 207. Título: dendÚ [i.e. dendê]
Mentha rotundifolia: um novo hospedeiro de Thanatephorus cucumeris no estado do Pará.
Resumos do XXXVIII Congresso Brasileiro de Fitopatologia. Resumo 091
Produção de blastosporos de Metarhizium rileyi (Farlow) Kepler, S.A. Rehner & Humber por fermentação líquida e sua patogenicidade a Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae).
Development of peach flower buds under low winter chilling conditions
Here, we reviewed both endogenous and exogenous factors involved in the processes of flower bud formation and flower development in peach, analyzing how they can be affected by climatic change in temperate zones, explored the expansion of peach to tropical or subtropical zones. The process of flower bud formation in peach differs between low winter chilling and temperate conditions. Although the main steps of flower development are maintained, the timing in which each one occurs is different, and some processes can be altered under low winter chilling conditions, with a great impact on fruit production and crop management. Further studies on flower bud induction and differentiation under warmer conditions are fundamental for addressing the alterations in flower bud development that negatively impact on next season’s harvest. In the future, horticulturalists and scientists will face several challenges, mainly how high temperatures affect the expression of the main genes regulating flower formation and how to improve crop management in these conditions
Alternative system to slash-and-burn for agriculture in the eastern Amazon region: Impacts on ant species richness.
Enriquecimento de floresta secundária para melhoria de um sistema agroflorestal sequencial no Nordeste paraense: avaliação de espécies nativas.
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