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  • 1
    Electronic Resource
    Electronic Resource
    Minority-carrier kinetics in heavily doped GaAs:C studied by transient photoluminescence (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5072-5078 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature photoluminescence decay time measurements in heavily doped GaAs:C-layers designed as base layers for heterojunction bipolar transistors are reported. These measurements provide access to nonequilibrium minority carrier lifetimes that determine the current gains of those devices. By systematically studying transient luminescence spectra over a wide range of excitation densities between 1013 and 1018 cm−3, we demonstrate the importance of carrier trapping processes at low excitation densities. Optimized excitation conditions that achieve trap saturation but also avoid stimulated emission are found for densities of (1–3)×1017 cm−3/pulse. Detection is limited to a spectral window well above the energy gap (beyond 1.5 eV). Values for both Auger and radiative recombination coefficients are given. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456244
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  • 2
    Electronic Resource
    Electronic Resource
    A New Procedure for the Differentiation of 01 Vibrio cholerae and Non-01 V. cholerae Recovered From Oysters (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Live oysters were inoculated with 01 V. cholerae or non-01 V. cholerae and the liquor from the oysters was spread onto thiosulfate citrate bile salts agar plates. After incubation the colonies with yellow centers were picked and streaked onto sheep blood agar plates. Biochemical tests were performed on all colonies. Isolates exhibiting characteristic V. cholerae reactions were checked for serological identity and inoculated into a vibrio medium. After incubation, the isolates were further analyzed for lactic and succinic acids by gas-liquid chromatography. Peak height ratios of lactic/succinic acid provided a testing parameter to distinguish all isolates of 01 V. cholerae from non-01 V. cholerae isolates recovered from the oysters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb14955.x
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  • 3
    Electronic Resource
    Electronic Resource
    Disposition of hexobarbital in intra- and extrahepatic cholestasis in man and the influence of drug metabolism-inducing agents (1980)
    Springer
    European journal of clinical pharmacology 17 (1980), S. 197-202 
    Details
    ISSN: 1432-1041
    Keywords: hexobarbital ; cholestasis ; phenobarbital ; rifampicin ; phenytonin ; pharmackoinetics ; drug metabolism ; induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of intravenously infused hexobarbital was studied in 10 patients with intrahepatic cholestasis and in 9 with extrahepatic biliary obstruction. The results were compared with those obtained in 16 healthy young volunteers and 5 older patients with normal liver function. After infusion, the plasma concentrations showed a rapid initial decline (α-phase) and subsequently a slower decrease (β-phase). The half-life of a latter phase was 323±84 min in the healthy group, 357±151 min in the patients with intrahepatic cholestasis and 344±115 min in the group with biliary obstruction; the clearances were 3.41±0.90, 4.08±1.95 and 3.81±1.97 ml×min−1×kg−1, respectively. The differences were not statistically significant. The mean volume of the central compartment of distribution and the steady state volume of distribution were not significantly different. In two patients hexobarbital clearance during cholestasis was greater than after it had subsided. After treatment of 11 patients with cholestasis with drug metabolism-inducing agents (phenobarbital, rifampicin or phenytoin), the half-life of hexobarbital was significantly shortened and the mean value of hexobarbital clearance was more than doubled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561900
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Ahornsirupkrankheit an zwei Familien (1964)
    Springer
    Human genetics 〈Berlin〉 1 (1964), S. 163-169 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389634
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  • 5
    Electronic Resource
    Electronic Resource
    Gold electrodes from recordable CDs for mercury quantification by flow injection analysis (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 444-448 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The development of a new methodology for the construction of very efficient flow cells for mercury detection by potentiometric stripping analysis, employing the thin gold layer of recordable CDs as working ¶electrode is reported. This new source of electrodes (CDtrodes) show very attractive performance, similar to that obtained with commercial gold electrodes, with superior versatility. The low cost of this new source of “gold electrodes” allows a frequent replacement of the electrode, avoiding cumbersome clean-up treatments. Various experimental parameters have been optimized to yield low detection limits (0.25 ng/mL of mercury for 5 min deposition at 0.3 V) and good precision (standard deviation of 1.9% was obtained for 15 repetitive measurements using 10 ng/mL of mercury). Standard curves were found to be linear over the range of 0.5–100 μg L–1 of mercury. The flow cells developed were used for the quantification of mercury in oceanic and tap water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050090
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Theorie kraftfreier Magnetfelder (1960)
    Springer
    The European physical journal 159 (1960), S. 194-211 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Force-free magnetic fields are defined by the equation rot $$\mathfrak{H} = \alpha \mathfrak{H}$$ . Making use of a moving Frenet coordinate system $$(\mathfrak{t} = tangential, \mathfrak{n} = normal, \mathfrak{b} = binormal unit vector)$$ we find the following general features of these fields: 1. grad $$\left| \mathfrak{H} \right|$$ is always parallel to the osculating plane of the $$\mathfrak{H}$$ -lines. 2. If the lines of force are rectilinear within a finite region of space, the component of grad $$\left| \mathfrak{H} \right|$$ along $$\left| \mathfrak{H} \right|$$ must be zero for a force-free field with rot . 3. The factor of proportionality $$\alpha = \alpha (\mathfrak{r})$$ and $$\mathfrak{H}$$ can be calculated by means of two equations involving only the direction of $$\left| \mathfrak{H} \right|$$ . For several models of force-free fields the effect of symmetry assumptions on $$\alpha = \alpha (\mathfrak{r})$$ is discussed using special coordinate systems. In the appendix it is pointed out that a particle drift arises in magnetic fields with .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338347
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  • 7
    Electronic Resource
    Electronic Resource
    Aussagen der Theorie von Kraichnan für die isotrope hydromagnetische Turbulenz (1962)
    Springer
    The European physical journal 169 (1962), S. 151-165 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory ofKraichnan is applied to quasi-stationary isotropic hydromagnetic turbulence. The average infinitesimal-impulse-response functionsg(k, τ), g m (k, τ) and the time-correlationsr(k, τ), r m (k, τ) are evaluated by the non-local direct-interaction approximation within the inertial range. For the range of ohmic but no viscous dissipation it is found that the magnetic energy spectrumE m (k) obeys aE(k)k −2-law in accordance with results ofGolitsyn andMoffatt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378292
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  • 8
    Electronic Resource
    Electronic Resource
    Zum Energiespektrum der isotropen hydromagnetischen Turbulenz (1963)
    Springer
    The European physical journal 174 (1963), S. 314-325 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The physical consequences emerging from a theory stated byKraichnan are considered with regard to isotropic hydromagnetic turbulence. This theory involves the direct-interaction approximation retaining the phase correlation within each triad of Fourier amplitudes. These interactions are suggested to be very important in hydromagnetic turbulence. Hydrodynamic as well as magnetic impulse-response function and time-correlation are unequivocally the same. This result suggests the existence of a universal equilibrium range. Within the inertial range the total energy spectrumE g (k)=E(k)+E m (k) obeys the same law as in hydrodynamic turbulenceE(k). The valueE m (k)≈E(k) corresponds roughly to maximum energy flux through this range. The magnetic energy flux decreases rapidly for eddies with larger wave-numbers within the range of ohmic ≫ viscous dissipation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378605
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  • 9
    Electronic Resource
    Electronic Resource
    Subchronic treatment with sodium 2,3-dimercaptopropane-1-sulfonate in methylmercury poisoning (1982)
    Springer
    Bulletin of environmental contamination and toxicology 29 (1982), S. 416-421 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605605
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  • 10
    Electronic Resource
    Electronic Resource
    Hydroxyapatite nucleation on Na ion implanted Ti surfaces (2000)
    Springer
    Journal of materials science 19 (2000), S. 1029-1031 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006782818468
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