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1986 (1)
1985 (1)
1Author    K. KirschfeldRequires cookie*
 Title    The Effect of Volatile Anesthetics on Giant Neurons in the Lobula Plate in the Fly  
 Abstract    Movement sensitive giant neurons in the lobula plate of the fly (H,-neurons, V-neurons) are affected by low con­ centrations of volatile anesthetics (halothane, N20): the spike frequency generated by motion in the preferred di­ rection decreases, that in the opposite direction increases. This means that the response to the motion stimulus de­ fined as the spike frequency modulation decreases. Higher concentrations of the anesthetics lead to an increasing spike frequency which is unaffected by the motion stimulus, until eventually no spikes are generated any longer. The results are in agreement with the assumption that the anesthetics increase the membrane permeability of these neurons. 
  Reference    Z. Naturforsch. 41c, 1137—1138 (1986); received September 17 1986 
  Published    1986 
  Keywords    Insect, Central Nervous System, Halothane, Nitrous Oxide 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-1137_n.pdf 
 Identifier    ZNC-1986-41c-1137_n 
 Volume    41 
2Author    A. HengleinRequires cookie*
 Title    Sonolysis of Carbon Dioxide, Nitrous Oxide and Methane in Aqueous Solution  
 Abstract    Water was irradiated with ultrasonic waves under an argon atmosphere which contained small amounts of carbon dioxide, nitrous oxide or methane. The yield of the products was measured as a function of the composition of the gas atmosphere. Maximum yields were observed at a few per cent of the added polyatomic gas. No chemical effects occurred in the irradiation under an atmosphere of pure C0 2 , N 2 0 or CH 4 . It is concluded that the gas mixture in the tiny gas bubbles, in which the chemical effects are brought about, is not in Henry's equilibrium with the aqueous gas solution. The main product of the sonolysis of C0 2 is CO, a small amount of formic acid also being formed. The sonolysis is explained by both the attack of H atoms from the sonolysis of water and direct decomposition of C0 2 due to the high temperatures existing in compressed gas bubbles. The main products of the sonolysis of N 2 0 are nitrogen, nitrite and nitrate. N 2 0 enhances the rate of various oxidations such as that of iodide, nitrite and propanol-2. In the methane containing solution, a lot of hydrogen is produced, the main oxidation products being ethane, ethylene, C 3 -and C 4 -hydrocarbons and carbon monoxide. A mechanism is postulated which involves both the attack on methane by radicals from the decomposition of water and thermal decomposition of methane. The local radical concentrations are so high that a methane molecule may undergo multiple radical attack. The similarity between sonolytic reactions and reactions occurring in flames is emphasized. 
  Reference    (Z. Naturforsch. 40b, 100—107 [1985]; received August 14 1984.) 
  Published    1985 
  Keywords    Ultrasonic Waves, Carbon Dioxide, Nitrous Oxide, Methane, Free Radicals 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0100.pdf 
 Identifier    ZNB-1985-40b-0100 
 Volume    40