Effect of a vitamin A-free diet on [3H]diazepam and [3H]GABA binding in the rat retina.

Benzodiazepine and GABA binding sites in the rat retina are influenced by a vitamin A-free diet. In rats fed a vitamin A-free diet, the total number of [3H]GABA and [3H]diazepam binding sites was markedly higher than in rats given a balanced diet. No differences were found in the apparent affinities of [3H]GABA and [3H]diazepam for their specific binding sites.

[Influence of a high protein diet on the urinary and fecal excretion of calcium in albino rats].

Albino rats (Sprague-Dawley) of mean weight 100 g were divided into four groups and given for 7 days a balanced diet. They were then placed in metabolic cages for fifteen days and fed diets containing different quantities of casein: 18% (D18), 36% (D36), 50% (D50) and 72% (D72). The levels of total calcium, inorganic phosphorus, alkaline phosphatase activity, total proteins and urea were determined.

[Uptake of retinol-C14 into liver mitochondrial membranes and erythrocyte stroma of albino rats on a vitamin A-free diet].

We have determined the incorporation of retinol-C14 into liver mitochondrial membranes and blood cell stroma in albino male Wistar strain rats, fed with a vitamin A deficient diet for 30, 60 and 90 days. At the end of the vitamin A deficient period, rats were kept fasting for 24 hours and then administered orally retinol-C14 (1,25 microC). They were divided into groups and killed after 3 hours, 3, 6, 12 days from the administration of retinol-C14.

[Uptake of retinol-C14 into different tissues of vitamin A deficient albino rats].

Groups of rats were fed a vitamin A free diet for 30, 60 and 90 days. They were then administered orally a single dose of 1,25 microC of retinol-C14. After 3 h, 3, 6 and 12 days from the administration, the incorporation into the different tissues was determined.