Estudo fitoquímico de Senna alata por duas metodologias

Senna alata leaves are a good source of propelargonidins.

Proanthocyanidins (PA) in Senna alata leaves were investigated by thiolysis with benzyl mercaptan, LC-MS and NMR and consisted of almost pure propelargonidins with <6% procyanidins, had B-type linkages and a mean degree of polymerisation of three. Epiafzelechin was the major flavan-3-ol subunit (>94%) and epicatechin a minor constituent (6.4%) in residual PA and mainly detected as an extension ...

Strategies for Developing NADH Detector Based on Meldola Blue in Different Immobilization Methods: A Comparative Study

Foi realizado um estudo comparativo entre duas metodologias de imobilização do Azul de Meldola (MB), utilizado para diminuir o potencial de oxidação do NADH. O estudo foi realizado no eletrodo de carbono vítreo através da eletropolimerização do pirrol e MB, empregando a técnica de voltametria cíclica e avaliando-se o efeito do número de ciclos para definir a espessura e a estabilidade do filme....

Serviços de Governo Eletrônico: um estudo sobre o uso por indivíduos no Brasil

Riscos Potenciais Inerentes à Computação em Nuvem Explorados por Meio de um Estudo Delphi

Information Technology (IT) is becoming a utility and, in this context, IT services in its mode called "cloud computing" are playing a growing role. This kind of outsourcing has proved advantageous in many ways, despite the existence of both barriers that oppose contracting this sort of services, and inherent risks. In order to explore in greater depth the issues related to the advantages, barr...

Contribuição ao estudo de fusão de mapas auto organizáveis de Kohonen com ponderação por meio de índices de validação de agrupamentos

The amount of collected and stored information is growing every day in several areas of knowledge and data mining techniques are applied to these datasets in order to extract useful knowledge. One or another algorithm, or the same algorithm with different attributes, can lead to different results due to the dataset diversity. To solve this problem, machines committees methods were developed. A ...