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  • 1
    Electronic Resource
    Electronic Resource
    Fluorescent styryl dyes applied as fast optical probes of cardiac action potential (1986)
    Springer
    European biophysics journal 14 (1986), S. 103-111 
    Details
    ISSN: 1432-1017
    Keywords: Potential sensitive dyes ; myocardium ; action potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Several styryl dyes were tested as fast optical probes of membrane action potentials in mammalian heart muscle tissue. After staining, atrial specimens were superfused in physiological salt solution, and fluorescence was excited by an argon ion laser. Excitation spot size on the surface of the preparation was 60 μm in diameter. Dyes RH 160, RH 237, and RH 421 performed excellently as fast fluorescent probes of cardiac membrane potential. Fractional fluorescence changes, ΔF/F, due to the action potential were in the range 2 to 6% at 514.5 nm excitation. Rise times of the action potential onset detected with each of the dyes were less than 0.5 ms, which is as fast or even faster than microelectrode measurements (atria of the rat). Thus membrane potential changes could be monitored with high resolution in both time and space. Emission spectra from heart muscle preparations stained with these dyes were shifted to shorter wavelengths by 70 nm and more as compared to spectra of the dyes in ethanol solution. The fluorescence spectrum of RH 160 at resting potential and the spectrum recorded during the plateau phases of the action potential were measured and showed no difference within the spectral resolution. As can be concluded from measurements of fluorescence changes at different excitation wavelengths, electrochromism cannot be the only mechanism causing the potential response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263067
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  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 63. Darstellung und Kristallstruktur von Tetramethyltitan-tetrahydrofuran (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 861-864 
    Details
    ISSN: 0044-2313
    Keywords: Tetramethyltitanium tetrahydrofuran ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Alkyl Compounds. 63. Preparation and Crystal Structure of Tetramethyltitanium TetrahydrofuranMe4Ti · 2THF 1 dissoziates partially in n-pentane. The formed Me4Ti · THF 2 could be isolated. According to X-ray structure determination the molecules of 2 have a trigonalbipyramidal shape with the THF molecule in axial position.
    Notes: Me4Ti · 2THF 1 unterliegt in n-Pentan einer partiellen Dissoziation. Das dabei entstehende Me4Ti · THF 2 konnte isoliert und die Kristallstruktur ermittelt werden. Danach liegen die Moleküle von 2 im Kristall in trigonal-bipyramidaler Form vor, mit dem THF-Molekül in axialer Position.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210526
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 62. Darstellung und NMR-spektroskopische Untersuchung von Komplexen des Tetramethyltitans (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 697-702 
    Details
    ISSN: 0044-2313
    Keywords: Tetramethyltitanium complexes ; n.m.r. data ; MO calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Alkyl Compounds. 62. Preparation and NMR-spectroscopic Characterization of Tetramethyltitanium ComplexesComplexes of tetramethyltitanium with THF and oxygen, nitrogen and phosphorous containing chelating ligands were synthesized and characterized by low temperature n.m.r. spectroscopy. The obtained complexes show a dynamic behaviour in solutions. The results of semiempirical MO calculations favour octahedral and not a trigonal prismatic configuration of the complexes.
    Notes: Komplexe des Tetramethyltitans mit THF, sowie sauerstoff-, stickstoff- und phosphorhaltigen Chelatliganden wurden synthetisiert und 1H- und 13C-NMR-spektroskopisch bei tiefen Temperaturen charakterisiert. Die erhaltenen Komplexe zeigen in Lösung ein dynamisches Verhalten. Aufgrund semiempirischer MO-Berechnungen ist einer oktaedrischen Konfiguration der Vorrang gegenüber einem trigonal-prismatischem Aufbau einzuräumen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200419
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 61. Darstellung und Kristallstruktur von Tetramethyltitan-1,2-bis(dimethylphosphino)ethan (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 523-526 
    Details
    ISSN: 0044-2313
    Keywords: Tetramethyltitanium-1,2-bis(dimethylphosphino)-ethane ; NMR data ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Alkyl Compounds. 61. Preparation and Crystal Structure of Tetramethyltitanium-1,2-bis(dimethylphosphino)ethaneThe title complex 1 was synthesized by addition of 1,2-bis(dimethylphosphino)ethane to a solution of tetramethyltitanium in diethylether. The complex was characterized by 1H, 13C and 31P NMR spectra and by X-ray crystal structure analysis. 1 consists of two independent molecules with distorted octahedral structure.
    Notes: Der Titelkomplex 1 wurde durch Addition von 1,2-Bis(dimethylphosphino)ethan an Tetramethyltitan in Diethylether erhalten. Der Komplex wurde 1H-, 13C- und 31P-NMR-spektroskopisch, sowie durch Röntgenkristallstruktur-analyse charakterisiert. 1 tritt in der Elementarzelle in zwei unabhängigen Molekülen mit verzerrt oktaedrischer Konstitution auf.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200322
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  • 5
    Electronic Resource
    Electronic Resource
    Widersprüche und Irrtümer in der analytischen Chemie. I. Die Fällung des Aluminiums durch Thiosulfat und seine Trennung vom Eisen. II. Das Altern maßanalytischer Thiosulfat-Lösungen (1922)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 55 (1922), S. 3161-3165 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19220550926
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