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  • Analytical Chemistry and Spectroscopy  (2)
  • Amino acids  (1)
  • γ-Aminobutyric acid  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Effects of taurine on GABA release from synaptosomes of rat olfactory bulb (1996)
    Springer
    Amino acids 10 (1996), S. 49-57 
    Details
    ISSN: 1438-2199
    Keywords: Amino acids ; Taurine ; γ-Aminobutyric acid ; Synaptosome ; Olfactory bulb ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Superfusion of synaptosomes prepared from rat olfactory bulb revealed constant basal release of endogenous taurine (Tau), aspartate (Asp), glutamate (Glu) andγ-aminobutyrate (GABA): their release rates were 110.4 ± 13.0, 30.3 ± 6.7, 93.7 ± 13.1, and 53.3 ± 8.8 pmol/min/mg protein, respectively. The depolarizing-stimulation with 30mM KCl evoked 1.17-, 2.18-, 2.55- and 1.53-fold increases, respectively. Tau release was calcium-independent. However, the perfusion of synaptosomes with Tau (10µM) inhibited the evoked increase in GABA release by 63% without changing basal release, although it did not affect release of Asp and Glu. Phaclofen (10µM, a GABAB receptor antagonist), but not bicuculline (10µM, a GABAA receptor antagonist), counteracted the Tau-induced reduction in GABA release. These data suggest that Tau may be abundantly released from nerve endings of rat olfactory bulb and that it may regulate GABA release through the activation of presynaptic GABAB autoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806092
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance Raman spectra of dioxygen adducts of manganese(II) porphyrins in dioxygen matrices (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 315-319 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The resonance Raman spectra of side-on type dioxygen adducts of Mn(TMP), Mn(TPP) and Mn(OEP), where TMP, TPP and OEP denote the dianions of tetramesityl-, tetraphenyl- and octaethyl-porphines, respectively, were measured in O2-Ar(1 : 30) matrices at ca. 15 K. The bands near 990, 710 and 430 cm-1 were assigned to ν(O2), νs(Mn—O) and νa(Mn—O), respectively, based on 16O2/18O2 isotopic shifts and normal coordinate calculations on an isosceles MnO2 moiety. Vibrational coupling between the νs (Mn—O) and porphyrin modes obscured the location of the former mode in the spectra of Mn(TPP)O2 and Mn(OEP)O2. The bands near 825 cm-1 which appear in all three porphyrins are shifted 34-36 cm-1 on 16O2/18O2 substitution. Evidence is presented to show that this band is due to the ν(Mn=O) of oxomanganese(IV) porphyrin, which was produced by photo-cleavage of the O—O bond of the dioxygen adduct. These ν(Mn=O) are ca. 70 cm-1 higher than those observed in acetonitrile solution. This has been attributed to the difference in the spin state; the oxomanganese(IV) porphyrins in acetonitrile solution are of high spin whereas those produced in O2-Ar matrices are of low spin.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250220603
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Raman resonance excitation profile of the μ-oxobis[pentacyanomanganate (III)] ion (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 577-579 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The resonance Raman spectra of potassium μ-oxobis[pentacyanomanganate(III)] cyanide, K7[Mn2O(CN)10]CN, were measured using exciting lines at 356.4, 406.7, 530.9, 568.2, 603.5, 647.1 and 676.4 nm. By combining these data with those obtained previously (excitations at 457.9, 476.5, 488.0, 496.5, 514.5 and 608.6 nm), the excitation profiles were plotted for three totally symmetric vibrations at 1880 (CNax strech), 527 (MnCax stretch) and 259 cm-1 (MnOMn stretch). It was found that the equation derived by Mingardi et al. can adequately express these excitation profiles and that the previous assignment of the electronic transition at 509 nm needs revision.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180808
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    Paper (German National Licenses)
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