Effect of heavy physical training on the catecholamine content of the heart and adrenals of the guinea-pig

Zusammenfassung Ein langdauerndes Training bewirkt keine Herabsetzung der Catecholamine in Herz und Nebennieren des Meerschweinchens.

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This work has been supported by a grant from Svenska Nationalföreningen mot Hjärt- och Lungsjukdomar.     

ATPase activity of guinea pig heart muscle

Riassunto L'Autore ha studiato l'influenza della concentrazione degli ioni Ca⁺⁺ e Mg⁺⁺ sull'ATPasi degli atri e dei ventricoli di cuore di cavia. Tale attività è maggiore a pH 9,2 che a pH 6,8. Mentre il Ca⁺⁺ influisce differenziando decisamente le attività degli atri da quelle dei ventricoli, il Mg⁺⁺ accentua piuttosto una differenza tra la parte destra e la sinistra. Il calore distrugge quasi completamente l'attività enzimatica dopo una permanenza a 60° per 20 min.     

The histamine content of guinea pig mast cells

Zusammenfassung Von der Voraussetzung ausgehend, dass alles Histamin in den Mastzellen lokalisiert ist, wurde berechnet, dass jede Mastzelle in Aorta, Trachea, Uterus und Jejunum des Meerschweinchens 25–34 µµg Histamin-Base enthält. Die anaphylaktische Freisetzung des Histamins war proportional der Verminderung des Mastzellengehaltes und wurde zu 12–17 µµg/Mastzelle berechnet. Jejunum gab keine anaphylaktische Reaktion.     

Action potentials of the guinea pig heart in sodium deficient solutions

Zusammenfassung Es werden Aktionspotentiale vom Meerschweinchenvorhof in Badelösungen verschiedener Na-Konzentrationen mittels intrazellulärer Elektroden registriert. Während das Aktionspotential desVentrikels relativ unempfindlich gegen Veränderungen der Na-Konzentration bleibt^{4, 6}, lässt sich die «Na-Hypothese» für denVorhof anwenden.

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Aided by a grant from the Italian Consiglio Nazionale delle Ricerehe.     

Effect of taurine administration on liver lipids in guinea pig

The oral administration of 0.4% taurine in drinking water for 14 consecutive days showed the following hepatic effects in male guinea pig. The percentage of tauro-conjugated biliary bile acids was increased from 17.2-54.2%; the ratio liver weight/body weight was increased, and fatty change was induced. Liver triglyceride concentration was accordingly increased; diglyceride and phosphatidylcholine concentrations were reduced by the treatment, while phosphatidylethanolamine level was not affected. These changes suggest an adverse effect of taurine administration on phosphatidylcholine hepatic synthesis.     

Effect of taurine administration on liver lipids in guinea pig

Summary The oral administration of 0.4% taurine in drinking water for 14 consecutive days showed the following hepatic effects in male guinea pig. The percentage of tauro-conjugated biliary bile acids was increased from 17.2–54.2%; the ratio liver weight/body weight was increased, and fatty change was induced. Liver triglyceride concentration was accordingly increased; diglyceride and phosphatidylcholine concentrations were reduced by the treatment, while phosphatidylethanolamine level was not affected. These changes suggest an adverse effect of taurine administration on phosphatidylcholine hepatic synthesis.     

Ascorbic acid: Effect of high doses on brain and heart catecholamine levels in guinea-pigs and rats

Zusammenfassung Längerdauernde Zufuhr hoher Dosen von Ascorbinsäure (1000 mg/kg) senkt bei Meerschweinchen, nicht aber bei Ratten, den Noradrenalin-Spiegel im Herzen signifikant. Hingegen wird bei beiden Tierspezies der Noradrenalin-Spiegel im Hirn nicht verändert.     

Nerve-mediated action of forskolin on guinea pig ileal mucosa

Summary The effects of forskolin on myenteric neuronal activity and mucosal function were examined in guinea pig ileum. Forskolin increased the excitability of myenteric neurons, and increased mucosal chloride secretion by stimulating enteric neurons as well as by acting directly on enterocytes.Acknowledgment. The authors thank E. Martens, S. Bowen for technical assistance and N. Schaad for secretarial assistance. This work was supported by National Institutes of Health Grants, F32-AM07301, K-104-AM1004, RO1-AM29699, RO1-AM26742 and an Eloise Gerry Fellowship.     

Nerve-mediated action of forskolin on guinea pig ileal mucosa

The effects of forskolin on myenteric neuronal activity and mucosal function were examined in guinea pig ileum. Forskolin increased the excitability of myenteric neurons, and increased mucosal chloride secretion by stimulating enteric neurons as well as by acting directly on enterocytes.     

Thermoadaptive influence on reactivity pattern of vasopressinergic neurons in the guinea pig

In cold-adapted guinea pigs, increased amounts of arginine-vasopressin (AVP) immunoreactive material could be visualized in neurons of the supraoptic and paraventricular nucleus, in fibers projecting to the neurohypophysis and in fiber terminals in the ventral lateral septum and in the amygdala. In warm-adapted animals the reactivity to AVP antiserum was poor in all neuronal structures examined. High AVP-immunoreactivity was accompanied by a reduced febrile response to bacterial pyrogen in cold-adapted guinea pigs.