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  • 1990-1994  (6)
  • 1940-1944  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 12186-12196 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 20 (1941), S. 867-868 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die Nachteile der bisher angegebenen Methoden zur Herstellung der Ausgleichslösung bei der Vitamin B1-Bestimmung mittels Thiochrom werden aufgezeigt. Es wird eine neue Methode zur Herstellung einer Ausgleichslösung beschrieben, die darin besteht, daß die Untersuchungslösung mit Natronlauge versetzt wird. Zur Vermeidung der Bildung blaufluorescierender Substanzen aus Aneurin wird dieser Ausgleichslösung vor dem Natronlaugezusatz Natriumhydrosulfit zugefügt. Zur Berechnung des mittleren Fehlers des Mittelwertes und der Einzelmessung wird eine Beleganalyse vorgelegt.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4252-4259 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The scattering of high vibrationally excited sodium molecules Na2(v=31) with Ne atoms at 180 meV collision energy is investigated in a crossed molecular beam arrangement using laser optical methods. Angularly resolved rotationally inelastic and vibrationally elastic cross sections ji→jf are measured for ji =5, 7, and 9≤jf ≤25. Pronounced rotational rainbow maxima are observed, the angular position of which indicates a significantly larger anisotropy of the interaction potential compared to that of Na2(v=0)–Ne. Except for the increase of the anisotropy the vibrational excitation has little effect on the dynamics of rotational energy transfer. Good agreement with a new semiempirical Na2–Ne potential surface V(r,R,γ) is found.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4215-4223 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The feasability of selective and complete population transfer between atomic or molecular levels by stimulated Raman scattering with delayed pulses involving spectrally broad light with characteristics typical for pulsed lasers is investigated. In extension of previous work, the effect on the transfer efficiency of phase fluctuations and of the detuning ΔR of the laser frequencies from the two-photon resonance is analyzed. The minimum pulse energy Pmin required to achieve a transfer efficiency of nearly unity is derived analytically, with some restrictions imposed on the type of phase fluctuations. Pmin increases approximately proportional to the square of the bandwidth of the laser radiation and to the square of ΔR. The conclusions are confirmed by the results of extensive numerical calculations. These studies also reveal a high sensitivity of the transfer efficiency to the autocorrelation of the fluctuating light.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 130 (1994), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Although myoepithelial cells are detectable in many benign sweat gland tumours, little is known about their role in sweat gland carcinomas. To specifically demonstrate myoepithelial cells, paraffin sections from 46 sweat gland carcinomas were stained, using a standard avidin-biotin-peroxidase complex method, with the monoclonal α-smooth muscle actin antibody 1A4. Myoepithelial cells were not found in adenoid cystic eccrine carcinoma (n=2), malignant nodular hidradenoma (n=2), porocarcinoma (n=4), extramammary Paget's disease (n= 12), sclerosing sweat duct carcinoma (n=4) or in adenosquamous mucoepidermoid carcinoma (n=l). In contrast, myoepithelial cells were demonstrated in two of eight apocrine adenocarcinomas, one of six mucinous eccrine carcinomas and two of seven eccrine adenocarcinomas. In all these tumours myoepithelial differentiation was found in peripheral cells of solid tumour islands, or in basal cells of tubular structures. However, in most areas of the tumours, myoepithelial layers were discontinuous. Cells in the centre of solid tumour nodules, and luminal cells of tubular structures, were negative for α-smooth muscle actin. In analogy to breast tumours, in which malignancy and invasiveness correlate with scattered or absent myoepithelial cells, we suggest that disrupted myoepithelial layers in sweat gland carcinomas may be interpreted as a loss of the invasion barrier.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 100 (1942), S. 126-135 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 20 (1941), S. 1174-1176 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Es wird eine neue Methode zur Bestimmung von Ascorbinsäure mittels Dichlorphenol-Indophenol beschrieben, die darin besteht, der zu titrierenden Lösung einen geringen Überschuß an Farbstoff zuzusetzen (2 ccm über den annähernden Umschlagpunkt) und diesen Überschuß nach 1/2 Minute mit einer n/200 -Lösung von Mohrschem Salz in Gegenwart von Natriumoxalat zurückzutitrieren. Die Methode liefert einen scharfen Umschlagpunkt im Gegensatz zu der ziehenden direkten Titration. Es werden Vergleichsanalysen für direkte Titration und Rücktitration gegeben, die gute Übereinstimmung ergeben.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 10 (1940), S. 133-150 
    ISSN: 1432-1246
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 103 (1943), S. 130-135 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung 1. Unbehandelte Kohle adsorbiert Askorbinsäure unter gleichzeitiger Oxydation. Die Adsorption folgt nicht der Boedeckerschen Adsorptionsformel. 2. Durch Vorbehandlung mit Reduktionsmitteln läßt sich die Oxydation stark vermindern. Besonders geeignet sind Na-hydrosulfit (Na2S2O4) und Na-sulfid. 3. Der Einfluß des Eisens der Kohle auf die Oxydation ist weniger bedeutend, vielmehr überträgt die Kohle direkt Sauerstoff auf die Askorbinsäure. 4. An mit Na-hydrosulfit vorbehandelter Kohle wurde die Adsorption von Askorbinsäure und Dehydroaskorbinsäure entsprechend der Boedeckerschen Formelx=K·(c−x) n gefunden (Fig. 1). Für Askorbinsäure + Dehydroaskorbinsäure:K = 1,55 undn = 1,28 (Kurve 1) für Dehydroaskorbinsäure:,K = 2,05 undn = 0,798 (Kurve 3) daraus für Askorbinsäure berechnetK ∼ 2,3 undn ∼ 0,8 (Kurve 4). Infolge der geringen Adsorption der Dehydroaskorbinsäure findet sich diese im Filtrat neben der Askorbinsäure. 5. Floridin, Bentonit und Frankonit adsorbieren die Askorbinsäure in metaphosphorsaurer Lösung praktisch in den verwendeten Mengen nicht, oxydieren diese aber etwas. Fullererde adsorbiert etwas, ohne dabei zu oxydieren.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 22 (1992), S. 491-494 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
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