Effect of strychnine on the electroretinogram of the isolated rabbit retina

Zusammenfassung Strychnin in einer Konzentration von 3×10^–6 bis 3,5×10^–5 M/l verursacht eine vorübergehende Vergrösserung derb-Welle des ERG der isolierten Kaninchennetzhaut, in einer Konzentration von 7×10^–5 bis 7×10^–4 M/l verkleinert es dieb-Welle. Aus den Ergebnissen wird geschlossen, dass die Substanz zumindest teilweise schon auf die Schicht des zweiten Neurons wirkt.     

Weak neuronal accumulation of octopamine in dopaminergic neurons of the rabbit retina

Summary Dopaminergic retinal neurons become weakly radioactive after the injection of tritiated octopamine into the vitreous, but no other neurons do so. This indicates the absence of any effective mechanism for the accumulation of octopamine in rabbit retina. *** DIRECT SUPPORT *** A2025055 00008     

Formation of lipoperoxide in the retina of rabbit exposed to high concentration of oxygen

Summary When rabbit was exposed to high concentration of oxygen, lipoperoxide in the retina was increased at 12 h of the exposure, after which period amplitude of electro-retinogram decreased. The degeneration was observed in the visual cell layer of the retina of the exposed animal. The exposure increased lipoperoxide in isolated retina. These data show the intervention of lipoperoxide in retinal degeneration induced by exposure to high concentration of oxygen.     

Formation of lipoperoxide in the retina of rabbit exposed to high concentration of oxygen.

When rabbit was exposed to high concentrations of oxygen, lipoperoxide in the retina was increased at 12 h of the exposure, after which period amplitude of electro-retinogram decreased. The degeneration was observed in the visual cell layer of the retina of the exposed animal.The exposure increased lipoperoxide in isolated retina. These data show the intervention of lipoperoxide in retinal degeneration by exposure to high concentration of oxygen.     

Demonstration of catecholaminergic neurons in rat retina by fluorescence histochemistry on cryostat sections]

A fluorescence histochemical technique using glyoxylic acid and cryostat sections has been worked out to visualize the dopamine-containing neurons of the retina. It allows the demonstration of catecholaminergic junctional cells and alloganglion cells, classically described. Moreover, the observation of some fluorescent fibers in the external zone of the inner nuclear layer, in contact with the outer plexiform, suggests the presence of catecholamine-containing interplexiform cells, in the Rat retina.     

Formation of norepinephrine from tyrosine in isolated rabbit heart

Zusammenfassung Die Bildung des Noradrenalins aus Tyrosin konnte im isolierten Kaninchenherzen nachgewiesen werden. Die Reaktion scheint für Tyrosin spezifisch zu sein. Aus Tyramin wurde kein Noradrenalin gebildet. Ebenfalls wurde die Umwandlung von Tyramin in Norsynephrin und von Dopamin in Noradrenalin nachgewiesen.     

Effect of isoprenaline on dopamine receptors in the rabbit isolated renal artery

Summary The relaxant effects of isoprenaline on rabbit isolated renal artery and aorta were compared. The results suggest that although isoprenaline acts on -adrenoceptors in the aorta it stimulates dopamine receptors in the renal artery.     

Staining of isolated rabbit neurons and neuroglial clumps

Summary Isolated rabbit neurons stained just as intensely as neuroglial clumps did with Mallory's phosphotungstic acid haematoxylin, Weil and Davenport's, Marsland, Glees and Erikson's and with Gallyas's silver stain.We wish to thank the Handicapped Children's Aid Committee, London, for generous support and a Unity Research Fellowship to K. D.     

Bayliss myogenic response in the isolated ductus arteriosus of guinea-pig and rabbit fetuses

Summary Isolated ductus arteriosus responds by marked constriction to increases in perfusion pressure. If, however, these increases exceed 90 mm Hg-130 mm Hg, the vessel suddenly dilates and its responsiveness becomes depressed. The importance of these findings in postnatal closure of ductus arteriosus is discussed.