Abstract
We analyze here the morphological and photometrical properties of a sample of isolated spirals with (18) and without (11) an active nucleus, based on near-infrared imaging in the J and K' bands. No difference is found between the properties of bulges, disks and bars of active and non-active galaxies. Central colors (the innermost 200 pc) of active galaxies are redder that the centers of non-active spirals. Secondary bars are not ubiquitous. Recent numerical simulations seem to be able to account for those active, barred galaxies with no secondary bar, either by means of nuclear spirals or by the direct effect of the primary bar.
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