Autoradiographs of human sera tagged with radioactive thyroxine and investigated in immunoelectrophoresis

Zusammenfassung Radioautographien menschlichen Plasmas, dem kleine Mengen von radioaktivem Thyroxin zugesetzt worden war, zeigten ein Präzipitat bei der Immunoelektrophorese mit Characteristika, die denen des ₁-Glykoproteins entsprechen. Grosse Mengen des Thyroxins verbanden sich auch mit der Albuminfraktion.     

14-3-2 protein in rat brain synapses

Summary The distribution of the 14-3-2 protein in rat brain synapses was studied by immuno electron microscopy. The protein was localized to the postsynaptic web and to the postsynaptic membrane, but was also prominent both in the presynaptic membrane and in the presynaptic densities. No significant activity was observed in the synaptic vesicles.Acknowledgments. Our sincere thanks to Mrs Ulla Svedin, Eng., for skilled technical assistance. This work was supported by grants from the Swedish Medical Research Council, the Medical Faculty of Göteborg, Tore Nilson's Foundation for Medical Research and by the Swedish-Italian Group of Neurobiology. A. G. received financial support from Consiglio Nazionale delle Ricerche (CNR, ROME).     

Ringschlußversuche mit halogenierten Naphthalinthioglykolsäuren

Summary It has been found that cyclisation of -halogenated -naphthalene-thioglycolic acids can occur in -position with the elimination of the halogen. The influence of the temperature and of a further substituent (halogen) in the second nucleus are discussed.     

Tensile strength and chemical composition of the middle lamella of the flax fibre

Zusammenfassung Es wurde die Zugkraft nasser Flachsfasern nach Behandlung mit verschiedenen Chemikalien geprüft. Es wurde gefunden, daß die Mittellamelle der Flachsfaser verschiedene miteinander verbundene Systeme enthält, nämlich Pektin, Lignin und eine im Oxalat unlös iche alkaliempfindliche Komponente.     

The importance of the lateral line system for the perception of surface waves in the claw toad,Xenopus laevis daudin

Zusammenfassung Blinde Krallenfrösche reagieren auch dann auf konzentrische Oberflächenwellen, wenn das gesamte Seitenliniensystem zerstört wird. Weitere Ausschaltversuche zeigen, dass der Reiz (Eintauchen eines Stabes) sehr wahrscheinlich über das Labyrinth perzipiert wird. Ob die Oberflächenwelle selbst oder (und) das Geräusch beim Eintauchen des Stabes wahrgenommen wird, ist noch nicht sicher entschieden.

---

---

My thanks are due to Dr.M. L. Mittelstaedt for critical help and to MissA. Middelmann for valuable technical assistance. This work was partly supported by a grant from the DFG.     

Inhibition of noradrenaline release from sympathetic nerves by pentobarbital

Summary Pentobarbital concentrations of 10–100 M selectively inhibited the noradrenaline release evoked by activation of the nicotinic receptors on the terminals sympathetic nerves of the rabbit heart. Higher concentrations also decreased the noradrenaline release induced by KCl or by electrical stimulation of the nerve axons.This paper is dedicated to Professor Dr. G. Malorny on the occasion of his 65th birthday.Acknowledgment: We thank Mrs G. Thielecke for technical assistance.     

Specificity in the hydrolysis of N-acyl-L-phenylalanine 4-nitroanilides by chymotrypsin

Summary The affinity of N-acyl-L-phenylalanine 4-nitroanilides for chymotrypsin is enhanced as the hydrophobicity of non-amino acid residues in the P₂-position of the substrates increases, whereas k_cat remains nearly constant. On the other hand, if alanine or leucine is in the P₂-position k_cat increases with decreasing K_M.