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A PDF based digital signed document format for interoperable institutional stru...
Luís M. Valente; Luís A. Maia; Manuel E. Correia; Lígia M. Ribeiro; Luís AntunesIt is widely recognized that information systems constitute a key tool for the overall performance improvement of administrative tasks in academic institutions. However at their genesis lies a latent promise of a paper-less environment that stays most of the time unfulfilled due to the lack of appropriate digital document integrity and accountability mechanisms. Academic institutions are thus most of the time s...
Interaction between DNA and Cationic Surfactants: Effect of DNA Conformation an...
Dias, Rita S.; Magno, Luís M.; Valente, Artur J. M.; Das, Dibyendu; Das, Prasanta K.; Maiti, Souvik; Miguel, Maria G.; Lindman, BjörnThe interactions between DNA and a number of different cationic surfactants, differing in headgroup polarity, were investigated by electric conductivity measurements and fluorescence microscopy. It was observed that, the critical association concentration (cac), characterizing the onset of surfactant binding to DNA, does not vary significantly with the architecture of the headgroup. However, comparing with the ...
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