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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3939-3944 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A method is demonstrated to measure high resolution absorption spectra, in the near ultraviolet region, with a bolometer in a molecular beam. The high resolution absorption spectrum of the P, Q, and R branches of the 1B3u (0–0) electronic transition of pyrazine was recorded. The observed residual Doppler linewidth is reduced to 50 MHz in the near ultraviolet region. Simultaneously with the absorption spectrum, the laser induced fluorescence spectrum was observed. A comparison is made between excitation and absorption intensities of the molecular eigenstate spectrum. It is concluded that substantial differences exist between both spectra. The intensities are not proportional, which is most clearly visible in the Q branch. This confirms earlier time resolved measurements and low resolution absorption spectra. However, the quantum yield of various, closely spaced molecular eigenstates is in the same order of magnitude. This observation justifies the approximation of absorption intensities by excitation intensities in some work.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Der Nervenarzt 70 (1999), S. 920-923 
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Bandscheibenprolaps ; Chemonukleolyse ; Komplikationen ; Myelopathie ; Key words Disc prolapse ; Chemonucleolysis ; Complications ; Myelopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Chemonucleolysis is a debated therapeutic method for herniated lumbar disc. We report a patient who suffered a sequence of characteristic sequels cumulating in late-onset myelopathy with persistent spastic paraplegia, sensory loss below T8 and bladder incontinence. Complications of chemonucleolysis are less frequent as compared to herniated disc surgery, but may cause severe impediment. Serious complications are anaphylactic shock, intracranial or spinal hemorrhage and transverse myelitis. This has to be taken into account for indication and patient information.
    Notes: Zusammenfassung Die Chemonukleolyse ist eine kontrovers beurteilte Behandlungsmethode des lumbalen Bandscheibenprolaps. Wir berichten über eine Patientin, die eine Reihe typischer Komplikationen erlitt, darunter eine subakute Spätmyelopathie. Statistisch treten nach Chemonukleolyse zwar seltener Komplikationen auf als bei operativen Therapieverfahren des lumbalen Bandscheibenprolaps, sie führen jedoch z.T. zu erheblichen Beeinträchtigungen. Zu den schwersten Komplikationen zählen allergische Reaktionen, zerebrale und spinale Blutungen und transverse Myelitiden. Dies muß bei Indikationsstellung der Chemonukleolyse und bei der Aufklärung der Patienten berücksichtigt werden.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The nucleotide sequence of the entire histidine transport operon from Salmonella typhimurium has been determined and is shown to consist of four genes, hisJ, hisQ, hisM and hisP. This operon provides the only example of a binding protein-dependent transport system for which the total number of ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 112-116 
    ISSN: 0044-2313
    Keywords: Bis(trimethylsilyl)-, bis(trimethylgermyl)carbodiimide ; substitution compounds ; chloro- and dimethylmetal(III) derivatives ; syntheses ; vibrational spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substitution Reactions of Bis(trimethylelement)carbodiimides of Silicon and Germanium with Metal Chlorides and Dimethylmetalchlorides of Sb, Al, Ga, and InThe reaction of Me3Ge—N=C=N—GeMe3 (Me=CH3) with SbCl5 in a 1 : 1 molar ratio forms dimeric Cl4SbNCNGeMe3 in high yields. The corresponding compounds (X2MNCNSiMe3)2-3 (with X=Cl, Me and M = Al, Ga), formed by reactions of X2MCl and Me3SiNCNSiMe3, are less stable and tend to condensations, eliminating Me3SiX. The carbodiimide derivates (Me2MNCNEMe3)2-3 (with E = Si, Ge) are also available in aprotic solvents from polymeric LiNCNEMe3 and Me2MCl (M = Al, Ga, In). According to the IR and Raman spectra the low associated substitution products consists of cyclic ring skeletons and asymmetric 〉 N—C≡N—EMe3 units with cyanamide conformation.
    Notes: Bei der Reaktion von Me3Ge—N=C=N—GeMe3 (Me=CH3) mit SbCl5 im Molverhältnis 1 : 1 entsteht in hoher Ausbeute dimeres Cl4SbNCNGeMe3. Die entsprechend aus X2MCl und Me3SiNCNSiMe3 dargestellten Verbindungen (X2MNCNSiMe3)2-3 (mit X = Cl, Me und M = Al, Ga) sind weniger beständig und neigen zu Kondensationen unter Abspaltung von Me3SiX. Carbodiimidderivate der Form (Me2MNCNEMe3)2-3 (mit E = Si, Ge) sind auch aus polymerem LiNCNEMe3 und Me2MCl (M = Al, Ga, In) in aprotischen Lösungsmitteln zugänglich. Die IR- und Ramanspektren der Verbindungen werden aufgenommen und diskutiert, danach weisen die niedrig assoziierten Produkte ein cyclisches Ringgerüst und unsymmetrische 〉N—C≡N—EMe3 Einheiten mit Cyanamidkonformation auf.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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