We recently studied a small number of highly inclined spiral galaxies, and used their special geometry to determine absolute extinction values of the dust in their dust lanes. We apply a simple model of a uniform mixture of stars and dust to the data, and find that the extinction values in these galaxies are the same as those making up the Galactic

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A sample of spiral galaxies is examined, applying moments analysis to their broad-band azimuthal profiles, in order to search for evidence of coherent large-scale star-forming processes in the form of star-formation fronts on one side of the arms. The methods employed enable to determine the position of Lindblad resonances and corotation, showing

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