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  • 1
    Electronic Resource
    Electronic Resource
    The effect of non-nicotinic drugs on the cat's adrenal medulla during block by nicotine (1972)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 275 (1972), S. 193-201 
    Details
    ISSN: 1432-1912
    Keywords: Adrenal Medulla ; Non-Nicotinic Agents ; Pilocarpine ; Muscarinic Transmission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Successive intravenous injections of nicotine cause a biphasic block of the adrenal medulla of the cat. During the early phase the adrenal glands fail to respond to any stimulant; however, during the late, non-depolarizing phase the glands respond to non-nicotinic agents (5-hydroxytryptamine, bradykinin and pilocarpine) and to potassium chloride at a time when there is a pronounced and insurmountable antagonism to nicotinic agents. During this late phase of the block the effects of most of these agents are enhanced, although the sensitivity to noradrenaline is not. The enhancement is abolished by hexamethonium, which lacks any effect on the sensitivity to noradrenaline. The results obtained with the muscarinic agent, pilocarpine, support the earlier postulate that transmission of impulses from the splanchnic nerve, as observed during the late phase of the block by nicotine, is mediated by muscarinic mechanisms sensitized by nicotine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508907
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  • 2
    Electronic Resource
    Electronic Resource
    Single-crystal electron-spin resonance study of the 4-phenyl-1,2,3,5-dithiadiazolyl radicalNRCC No. 30635. (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 1161-1165 
    Details
    ISSN: 0749-1581
    Keywords: Electron spin resonance ; Electron paramagnetic resonance ; Free radical ; π-Radical ; Heterocyclic free radical ; g Tensor ; Hyperfine interaction tensor ; Nitrogen hyperfine interaction ; Dithiadiazolyl ; Dithiadiazolylium ; Dithiadiazolium ; Unpaired electron ; Unpaired electron spin density ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Single crystals of 4-phenyl-1,2,3,5-dithiadiazolium trithiatriazinide , prepared by the reduction of S5N5+AlCl4- in SO2 with , contain a trace paramagnetic impurity which is shown by EPR spectroscopy to be the dithiadiazolyl free radical . The g and 14N hyperfine tensors of the radical were deduced from measurements made throughout three mutually orthogonal planes of crystallographically aligned specimens: g = (2.0011, 2.0075, 2.0197); 14N(2) = (37.1, 11.3, 3.4 MHz.). Within experimental error, the two nitrogen hyperfine interaction tensors are collinear and have their maximum principal value aligned parallel to gmin and perpendicular to the plane of the host cation. The results are interpreted in terms of a planar π-radical which substitutes for the planar host cation, and which has considerable unpaired spin density in N(2px) atomic orbitals directed perpendicular to the heterocyclic ring.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260271210
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    Paper (German National Licenses)
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