The activation of membrane ATPase by ouabain in several tissues of the golden hamster (Mesocricetus auratus) in the absence of potassium

Summary The activity of the membrane ATPase of 5 organs of the golden hamster was increased by 10^–7–10^–3 moles/l ouabain in K⁺-free medium. In similar experiments on rats no increase was observed.     

Urease inhibition by hydroxamic acids

Summary Ureases from jack beans andRhodototorula pilimanae were observed to be inhibited by primary hydroxamic acids but were not inhibited by acyclic-secondary (N-alkyl) hydroxamic acids.This project was supported by a Lamar University organized research grant.     

Acidolytic cleavage of peptide bonds during acetylation

Zusammenfassung Eine Spaltung von Peptiden tritt auf, wenn versucht wird, gewisse Derivate in an sich üblicher Weise herzustellen. Damit wird auf die Möglichkeit einer Fehlinterpretation hingewiesen.     

Effects of anaesthesia and chronic catheterization on circulating levels of prostaglandins (PGE2 and PGF2a in dogs

Summary Chronic catheterization of aorta and inferior vena cava in dogs did not significantly affect circulating levels of prostaglandins (PGE₂ and PGF_2a ). Pentobarbital (30 mg/kg i.v.) anaesthesia produced a significant decrease in PGF_2a .This work was supported by INSERM (grant No. 76.5.183.5).We wish to thank Miss Laure Eloy and Mrs Annick Soubrier for their technical assistance.     

The effects of intraventricular injection of 6-hydroxydopamine on the sleep of kittens during development]

Intraventricular injection of 6-hydroxydopamine does not modify the states of alertness in the Kitten, if it is performed in the first week of postnatal life. At three weeks of age, it induces the same sleep impairments as those observed in the adult Cat. Therefore, in the immediate postnatal period, sleep control is not achieved through the monoaminergic systems.