[Changes produced by the administration of rhodamine 6GO in the albino mouse]

The two doses, 5 and 7 mg/kg/day, were applied for periods of 14 or 28 days, with a 21 day break between two 14 days treatments in the latter case. Controls were only treated with physiological saline. A decrease in corporal weight and rectal temperature, as well as a decrease in ingestion and faeces together with urine increment were observed in the experimental animals during the first period of treatment. Normal levels were recovered during the break time, but the previous pattern reappeared during the second period of treatment. Suprarenals, liver, kidneys and spleen increased in some experimental groups when compared with controls whereas the thymus presented no significant differences. The studied organs showed signs of impairment.

A layered model for visual processing in avian retina

Visual processing in avian retina is interpreted by means of a layered model in which: a) outer layers provide with spatio temporal fast and retarded versions of the stimuli incident on the retina; a possibility is that horizontal cells are involved in isotropically generating the retarded version which is transversally translated; b) prominent specialization of ganglion cells is the result of local non-linear lateral interaction at the inner plexiform layer, mediated by amacrines which return, also isotropically, the translated retarded signals. Small though systematic deviations in the sites of the lateral interaction result in anisotropic but uniform receptive fields for some ganglion cells. A simple though general expression for the model is derived which includes the various types of recorded avian ganglion retinal cells responses, which also permits a unified interpretation of visual processing in avian and cat's retinae.

[Prevention of burns in children (author's transl)]

Based on their experience of 1,870 burned children, authors point out the main etiologic factors involved and discuss the preventive actions among which an improvement of the familial income and an adequate diffusion of safety rules seem to be the most relevant.