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'fluorescence' in keywords Facet   Publication Year 1991  [X]
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1Author    Snezhana BakalovaRequires cookie*
 Abstract    o lv e n t E f fe c ts o n th e F lu o re s c e n c e P r o p e r tie s o f M e th y ld ih y d ro q u in o lin o n e s The absorption and fluorescence spectra and the fluorescence quantum yields of two methyl-2,3-dihydro-4(lH)-quinolinones in various solvents are reported. In some solvents deuteration-induced fluorescence enhancement has been observed. The solvent effects in aprotic solvents are consistent with the general type of solvent interaction. For protic solvents, solute-solvent complexation in the excited state is suggested. 
  Reference    Z. Naturforsch. 46a, 823—827 (1991); received May 24 1991 
  Published    1991 
  Keywords    Fluorescence, Dihydroquinolinones, Hydrogen bond 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0823.pdf 
 Identifier    ZNA-1991-46a-0823 
 Volume    46 
2Author    Z. NaturforschRequires cookie*
 Title    Propagation of Voltage Transients in Arborized Neurites of Retzius Cells of the Leech in Culture  
 Abstract    Propagation o f electrical signals is studied in Retzius cells o f the leech in culture using volt­ age-sensitive fluorescent dyes at a spatial resolution o f 8 x 8 (am2 and 1 4 x 1 4 |im 2 and at a sam ­ pling interval o f 0.12 ms. The neurons are stimulated by a microelectrode impaled in the soma. Action potentials o f a halfwidth o f 2 -3 ms are triggered close to the end o f the primary neurite dissociated from the leech. They propagate back to the soma at invariant halfwidth at a veloci­ ty o f 5 0 -2 3 0 jam/ms. They pervade extended arborized secondary neurites which are grown on extracellular matrix protein. Their width is enhanced up to a factor two. The velocity is around 1 0 0 -150 (im/ms such that delays up to 3.5 ms are observed. Accordingly the neuritic trees are not isopotential. The features o f propagation are found to be incompatible with passive spread. 
  Reference    Z. Naturforsch. 46c, 687—6 (1991); received March 5 1991 
  Published    1991 
  Keywords    Leech, Neuron, Arborization, A ction Potential, Fluorescence 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0687.pdf 
 Identifier    ZNC-1991-46c-0687 
 Volume    46