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  • 1
    Electronic Resource
    Electronic Resource
    Influence of oxygen on production and consumption of nitric oxide in soil (1991)
    Springer
    Biology and fertility of soils 11 (1991), S. 38-42 
    Details
    ISSN: 1432-0789
    Keywords: Nitric oxide ; Nitrous oxide ; Denitrifiers ; Nitrifiers ; Compensation concentrations ; Uptake rate constants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary NO and N2O release rates were measured in an acidic forest soil (pH 4.0) and a slightly alkaline agricultural soil (pH 7.8), which were incubated at different O2 concentrations (〈0.01 – 20% O2) and at different NO concentrations (40 – 1000 ppbv NO). The system allowed the determination of simultaneously operating NO production rates and NO uptake rate constants, and the calculation of a NO compensation concentration. Both NO production and NO consumption decreased with increasing O2. NO consumption decreased to a smaller extent than NO production, so that the NO compensation concentrations also decreased. However, the NO compensation concentrations were not low enough for the soils to become a net sink for atmospheric NO. The release of N2O increased relative to NO release when the gases were allowed to accumulate instead of being flushed out. The forest soil contained only denitrifying, but not nitrifying bacteria, whereas the agricultural soil contained both. Nevertheless, NO release rates were less sensitive to O2 in the forest soil compared to the agricultural soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335832
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  • 2
    Electronic Resource
    Electronic Resource
    Experiments on interferometric enhanced scattering in a plasma with a nonuniform magnetic field (1998)
    Springer
    Technical physics letters 24 (1998), S. 806-809 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results are presented from the first experiments on interferometric enhanced scattering (IES) in a plasma in a nonuniform magnetic field. Measurements of the lower hybrid fluctuations of the plasma density by the IES and rf probe methods in an experimental geometry that models a tokamak configuration are found to be in satisfactory agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262275
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  • 3
    Electronic Resource
    Electronic Resource
    Propagation and damping of m=+1 and m=−1 helicon modes in an inhomogeneous plasma column (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1052-1058 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of the density gradient on the dispersion of the m=+1 and m=−1 helicon modes is investigated both theoretically as well as numerically. In particular, attention is focussed on the helicon wave damping that is closely related to the rf power absorption and the Poynting flux. It is shown that the propagation characteristics of the m=−1 mode changes drastically when the density gradient is sufficiently strong. This mode exhibits a cutoff that depends on the gradient scale length and the plasma parameters. In the regime where both helicon modes propagate, the excitation of the m=−1 mode is unlikely as it is strongly damped. The results give evidence that the density gradient effect is decisive for the formation of helicon discharges, which are predominantly sustained by the m=+1 mode. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873352
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  • 4
    Electronic Resource
    Electronic Resource
    Radio frequency power deposition in a high-density helicon discharge with helical antenna coupling (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4308-4319 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A high-density helicon discharge (ne≤1020 m−3) produced through a new m=1 helical antenna is investigated. Various diagnostics are applied to measure the discharge parameters and the radio frequency (rf) quantities like the plasma resistance and the rf field distribution. Special attention is paid to the axial asymmetry of the discharge, which is characteristic for helicon devices with helical antennas. The axial profiles of the rf wave fields, as well as the energy deposition profiles, reveal that the rf power is mainly transferred and absorbed via the m=+1 helicon mode traveling in the positive magnetic-field direction. The experimental findings are compared with numerical results obtained from a fully electromagnetic model, which takes into account the rf current distribution of the launching antenna, as well as the finite size of the plasma column. The antenna–plasma coupling, as well as the total rf power deposited in the plasma, can be explained satisfactorily if the measured profiles are taken in the computations. In particular, the axial asymmetry of the helicon discharge can be understood in terms of the radial inhomogeneity of the plasma column. Furthermore, the calculations show that the small-scale Trivelpiece–Gould waves may be excited near the plasma edge. These waves would carry a considerable fraction of the absorbed rf power and may thus be important for the rf power coupling. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288399
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  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructural localization of transferrin synthesis in rat hepatocytes during prenatal and postnatal development
    Amsterdam : Elsevier
    Cell Differentiation 10 (1981), S. 211-217 
    Details
    ISSN: 0045-6039
    Keywords: development ; rat liver ; transferrin synthesis ; ultrastructural localization
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0045-6039(81)90003-8
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  • 6
    Electronic Resource
    Electronic Resource
    Demonstration of the simultaneous presence of transferrin, hemopexin and albumin in the same adult rat hepatocyte
    Amsterdam : Elsevier
    Cell Differentiation 8 (1979), S. 39-48 
    Details
    ISSN: 0045-6039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0045-6039(79)90016-2
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  • 7
    Electronic Resource
    Electronic Resource
    Development of the fetal rat liver: ultrastructural and stereological study of hepatocytes
    Amsterdam : Elsevier
    Cell Differentiation 24 (1988), S. 9-24 
    Details
    ISSN: 0045-6039
    Keywords: Development ; Hepatocyte ; Rat liver ; Stereology ; Ultrastructure
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0045-6039(88)90082-6
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of active ingredients and preservatives in creams by capillary electrochromatography (CEC) (1999)
    Springer
    Chromatographia 49 (1999), S. S35 
    Details
    ISSN: 1612-1112
    Keywords: Capillary electrochromatography ; Packing materials ; Mixed-mode phase ; Active ingredients and preservatives in creams ; Cortisone derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Capillary electrochromatography (CEC) is an analytical method of growing interest to the pharmaceutical industry. Because CEC is a combination of high-performance liquid chromatography (HPLC) and capillary electrophoresis (CE) it has the advantages of the high selectivity of HPLC and the high efficiency of CE. The capillaries can be packed with different packing materials. The mixed-mode phase consisting of a strong cation exchanger and alkyl chains on the silica surface has some advantages over conventional reversed-phase (RP) packing materials. In this article the authors describe the use of CEC to separate the active ingredients and preservatives in creams from different manufactures. On the basis of the high efficiency of CEC it was possible to develop one isocratic method for all the compounds in the different samples. The method was validated with regard to identification, reproducibility, linearity, limit of detection, and quantitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02468974
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  • 9
    Electronic Resource
    Electronic Resource
    Radiation-induced activation of transcription factors in mammalian cells (1990)
    Springer
    Radiation and environmental biophysics 29 (1990), S. 303-313 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary In mammalian cells radiation induces the enhanced transcription of several genes. The cis acting elements in the control region of inducible genes have been delimited by site directed mutagenesis. Several different elements have been found in different genes. They do not only activate gene transcription in response to radiation but also in response to growth factors and to tumor promoter phorbol esters. The transcription factors binding to these elements are present also in non-irradiated cells, but their DNA binding activity and their transactivating capability is increased upon irradiation. The signal chain linking the primary radiation-induced signal (damaged DNA) to the activation of transcription factors involves the action of (a) protein kinase(s).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01210410
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  • 10
    Electronic Resource
    Electronic Resource
    Response of pig lung to irradiation with accelerated 12C-ions (1999)
    Springer
    Radiation and environmental biophysics 38 (1999), S. 185-194 
    Details
    ISSN: 1432-2099
    Keywords: Key words Normal tissue ; Minipig ; Lung ; Heavy particles ; Carbon ionsIntroduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract  The response of pig lungs to irradiation with 12C-ions was assessed in two experiments to validate the procedures for heavy ion therapy planning at the Gesellschaft für Schwerionenforschung (GSI) and to explore their range of applicability. In both experiments, the target volume (spread-out Bragg peak, SOBP) was planned to be a 4 cm long cylinder with a diameter of 4 cm. Doses in the SOBP were prescribed to be equivalent to 5×4 Gy, 5×5.5 Gy and 5×7 Gy of x-rays in the first experiment, and to 5 fractions of 7 Gy and 9 Gy in the second experiment. The lung response in the first experiment was less than expected on the basis of earlier experiments with photons. Pneumonitis reaction and chronic fibrotic changes were observed outside the prescribed high-dose region. In the second experiment, the effects were more pronounced than had been expected on the basis of the first experiment. Changes were most intense in the high-dose region, but were also seen throughout the lung along the beam channel. Moreover, significant skin reactions were observed at the beam entrance site in all animals and – less pronounced – at the beam exit site in 3 of the 6 animals. In conclusion, the complex irradiation geometry of the pig lung, the changes of body weight between the two experiments, and insufficient accounting for a change in the relative biological effectiveness (RBE) computation led to substantial deviations of the observed reactions from expectations, the reasons for which could be identified in a subsequent analysis. The less pronounced lung reaction in the first experiment was due to an overestimation of RBE in a preliminary version of the algorithm for its determination. The extension of the fibrotic reaction resulted from the smear-out of the high-dose region due to density variations in tissue structures, respiratory movement, and limited positioning accuracy. The skin reactions at the entrance port reflect the different treatment geometry in the two experiments. The one unexplained observation is the mild skin reaction that was observed in the second experiment at the beam exit site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004110050154
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