| | 1 | Author
| Snezhana Bakalova | Requires cookie* | | | Title
| S  | | | | 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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| default:Reihe_A/46/ZNA-1991-46a-0823.pdf | | | | Identifier
| ZNA-1991-46a-0823 | | | | Volume
| 46 | |
| 2 | Author
| Z. Naturforsch | Requires 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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| default:Reihe_C/46/ZNC-1991-46c-0687.pdf | | | | Identifier
| ZNC-1991-46c-0687 | | | | Volume
| 46 | |
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