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  • 1985-1989  (3)
  • 79.70  (2)
  • Acetylcholine  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Acetylcholine-induced change in intracellular Cl− activity of the mouse lacrimal acinar cells (1985)
    Springer
    Pflügers Archiv 405 (1985), S. 108-111 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Lacrimal gland ; Cl− activity ; Acetylcholine ; Cl− permeability ; Ca2+ ionophore
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Using double-barreled Cl−-sensitive microelectrodes, intracellular Cl− activity (A Cl i ) in the mouse lacrimal acinar cells in vitro was determined in both resting and secretory phases. In the resting stateA Cl i was 31 mmol/l which was 1.4 times higher than that predicted for the passive distribution according to the membrane potential (V m) of −41 mV. Addition of acetylcholine (ACh, 1μM) hyperpolarizedV m to −63 mV and decreasedA Cl i to 20 mmol/l which was still twice the equilibrium activity. A-23178 produced similar changes inV m andA Cl i to those induced by ACh. It was concluded that Cl− was actively accumulated in the acinar cells and, in the secretory phase, Cl− efflux was enhanced by the increased driving force and Ca2+-mediated increase in the Cl− permeability across the cell membrane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00584530
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  • 2
    Digitale Medien
    Digitale Medien
    Cluster cations ejected from liquid metal ion source: alkali metals (Li, Na) and group IV elements (Si, Ge, Sn, Pb) (1989)
    Springer
    The European physical journal 12 (1989), S. 225-227 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40 ; 79.70 ; 35.20.X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Cluster abundance of Li n + (n≤19), Na n + (n≤25), Si n z+ (n≤8 forz=1, 3≤n≤7 forz=2), Ge n z+ (n≤11 forz=1, 3≤n≤9 forz=2,n=4 forz=3), Sn n z+ (n≤7 forz=1, 3≤n≤9 forz=2,n=4 forz=3) and Pb n z+ (n≤6 forz=1, 5≤n≤7 forz=2) ejected from a liquid metal ion source has been investigated by mass spectrometry. The abundance spectra of alkali metal clusters showed distinct maxima and steps atn=3, 7, 9, 13 and 19 for Li, and atn=3, 5, 11, 13 and 19 for Na. Mass spectra of Si, Ge and Sn clusters were very similar each other, showing intensity drops aftern=4 and 6 (and alson=10 for Ge) for singly charged clusters. The magic numbers observed are discussed in terms of stability of charged clusters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01426943
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  • 3
    Digitale Medien
    Digitale Medien
    Abundance of Na cluster ions ejected from a liquid metal ion source (1989)
    Springer
    The European physical journal 11 (1989), S. 87-91 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40 ; 79.70 ; 35.20.X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Sodium cluster ions Na+ n withn ranging up to 25 have been observed from a liquid sodium ion source by using a magnetic mass analyzer. Ion intensity as a function of cluster size showed distinct steps and local maxima atn=3, 5, 11, 13 and 19 (magic numbers), and a pronounced odd-even alternation. The features in the ion abundance curve are attributed to the relative stability of cluster ions. The observed magic numbers are only partially explained by the electronic shell model, indicating need to include a consideration of atomic structure in a cluster.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01436588
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