Geometry, stochastic calculus and quantum fields in a non-commutative space-time

The algebras of non-relativistic and of classical mechanics are unstable algebraic structures. Their deformation towards stable structures leads, respectively, to relativity and to quantum mechanics. Likewise, the combined relativistic quantum mechanics algebra is also unstable. Its stabilization requires the non-commutativity of the space-time coordinates and the existence of a fundamental length constant. The new relativistic quantum mechanics algebra has important consequences on the geometry of space-time, on quantum stochastic calculus and on the construction of quantum fields. Some of these effects are studied in this paper.Comment: 36 pages Latex, 1 eps figur

Modulation of gene expression in ex vitro grapevine (Vitis vinifera L.) by hormonal, oxidant and anti-oxidant stimuli

When in vitro plantlets developed under low light conditions are exposed to high light upon transfer to ex vitro, it is common to observe symptoms of oxidative stress. In order to unravel more of what takes place in this phase of transition, paramount for plant survival, the present study focused on the expression of genes coding for proteins related with the metabolic pathways most affected upon transfer to ex vitro and monitored their expression in response to hormones and chemicals inducing alternative sinks for photosynthetic electron transport (PET) and reactive oxygen species (ROS) production. The expression of eight genes was significantly downregulated after all the treatments: catalase, beta-glucosidase, cytochrome P450, vegetative storage protein 2, wak1, a calcium binding protein, a meprin and TRAF homology domain-containing protein and a serine/threonine kinase. It was possible to verify that abscisic acid (ABA) was able to revert light induced gene expression and that the PET inhibitors DCMU and DPI had the same effect as ABA. ABA and jasmonic acid showed parallel effects, as both induced the expression of the same set of genes. Finally, exogenous cytokinin, instead of enhancing the plant´s response to high light led to the downregulation of light-responsive genes

Relação entre pressão e volume para implantação da técnica in vitro semi-automática de produção de gases na Embrapa Cerrados.

bitstream/CPAC-2010/30269/1/comtec-144.pd

Principais resultados do estudo da cadeia produtiva do mel de abelhas do Estado do Piauí: Pesquisa socioeconômica.

O desenvolvimento da apicultura no Estado do Piauí representa uma alternativa de grande importância sócio-econômica diante da crise agrícola atual. Milhares de famílias estão direta e indiretamente envolvidas na produção e no processamento dos produtos apícolas, principalmente do mel de abelhas. A importância mencionada provocou a necessidade do desenvolvimento de estudo mais amplo que permitisse uma compreensão totalizadora dos entraves que têm limitado o desenvolvimento deste agronegócio no estado. O trabalho objetiva apresentar o resultado do estudo da cadeia produtiva do mel do Piam, através de análise dos gargalos identificados entre os elos constituintes desta cadeia

Avaliação da atividade celulolítica de agentes de controle biológico.

In: CONGRESSO BRASILEIRO DE DEFENSIVOS AGRÍCOLAS NATURAIS, 5., 2011, Jaguariúna. Anais... Jaguariúna: Embrapa Meio Ambiente, 2011. 1 CD ROM

Validação de marcadores microssatélites em Urochloa decumbens e avaliação da transferibilidade para outras espécies deste gênero.

Comissão organizadora: Grácia Maria Soares Rosinha, Alexandra Rocha de Oliveir, Rodrigo Carvalho Alva