RESUMO
Total proteins levels and the embryonic development of sea urchin (Lytechinus variegatus) eggs treated with 25 micrograms/ml of YbCl3 in sea water for one hour were studied. After the treatment, eggs were let to develop for 24 hours when the total proteins levels were determined and morphological changes as well as the synchronism of the embryonic development have been checked.
Assuntos
Óvulo/efeitos dos fármacos , Proteínas/análise , Ouriços-do-Mar/fisiologia , Itérbio/farmacologia , Animais , Óvulo/ultraestruturaRESUMO
Hemidecortication, which consists of removing one cerebral hemisphere, leaving intact the thalamus and hypothalamus, affects the hypothalamus-hypophyseal axis producing hypothyroidism. Hemidecorticate rats showed a significant decrease in the weekly eruption rate of the upper incisors and partial recovery after the administration of thyrotrophin-releasing hormone (TRH). The uptake of [3H]-glycine, 1 and 4 h after a single injection, shown by radioautography, was 25 to 50 per cent higher in the periodontal ligament of the experimental animals. Most of the labelled material was non-collagenous proteins because only 20 to 30 per cent was removed by collagenase.