Prof. Guido Palladini

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The pigmentary system of the planaria, Dugesia gonocephala s.l. (Platyhelminthes, Turbellaria, Tricladida), has been studied by light and electron microscopy. The system consists of granules contained in chromatophore-like cells embedded in the parenchyma. The cell processes penetrate between the muscle layers and extend to the sub-epidermal basal lamina.(More)
Photosensitization phenomena may be induced in planarias by eosin and hematoporphyrin, and as a result, dopamine agonistic behavior (“screw-like” hyperkinesia) is set up in the animal. Histochemical, ultrastructural and pharmacological investigations have shown that this hyperkinesia is of postsynaptic origin in eosin photosensitization, and of pre-synaptic(More)