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  • 1975-1979  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Particle densities in a decaying SF6 plasma (1978)
    Springer
    Applied physics 16 (1978), S. 425-432 
    Details
    ISSN: 1432-0630
    Keywords: 52.75Kq ; 52.25Dg ; 52.80Mg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Particle densities are determined for a decaying axially blown SF6 are between current zero and brekdown, some 100 μs later. During the time of interest, primarily only atoms, diatomic molecules and ions can be built up by reactions. Therefore, in a first approach equilibrium densities are derived for SF6 which has decomposed into its considemic and diatomic components. In a second approach reaction kinetics are considered. It turns out that the development of densities occurs in two steps. During the first approx. 100 μs there is a strong deviation from equilibrium. Afterwards the most abundant particles remain near their partial, diatomic equilibrium values. Near breakdown the degree of ionization is of the order of 1013 cm−3 with the most abundant ions S 2 + and F−. This density is sufficient to distort the applied electric field. Future theories of breakdown in hot gases must take into account this principal difference as compared with the conditions in cold gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885870
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    TIME-DEPENDENT PARTITIONING OF GLUCOSE CARBONS METABOLIZED BY THE SUPERIOR CERVICAL GANGLION FROM CALVES (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 31 (1978), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Glucose metabolism in the superior cervical ganglion for calves has been studied by incubating slices with [1-14C]-, [6-14C]- and [U-14C]-labelled glucose at 37°C and pH 7.4. Glucose utilization and the metabolic partitioning of glucose carbon in products during different incubation periods ranging from 5 to 60 min were determined by isotopic methods.Separation and identification of labelled compounds have been achieved by anion and cation exchange chromatography as well as by TLC and enzymatic analyses.From the data obtained a carbon balance could be constructed showing lactate to be the major product of glucose metabolism followed by CO2 and amino acids. Measuring the release of 14CO2 from differently 4C-labelled glucose, the existence of an active pentose phosphate pathway in the ganglion could be demonstrated although this pathway seems to contribute only to a small extent to glucose metabolism. The marked decrease of the C-U: C-6 and the C-U:C-1 ratios in 14CO2 observed in the course of incubation is discussed in terms of a time-dependent change in the rate of synthesis of amino acids which are directly connected with intermediates of the citric acid cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1978.tb12450.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Breakdown field strength of unitary attaching gases and gas mixtures (1979)
    Springer
    Applied physics 18 (1979), S. 321-333 
    Details
    ISSN: 1432-0630
    Keywords: 51.50.+v ; 52.20F s ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A model is presented, which yields the breakdown field strength for space-chargefree configurations and the corona onset voltage for conditions with space charges in unitary, attaching gases and gas mixtures. It is entirely based on a physical description. Therefore, it does not require form parameters to be adjusted by comparison with experiments. It only necessitates the knwoledge of a set of any three material data out of a list of eight material properties which are available for a large number of gases. The model is applied to SF6 as well as to binary and multiple mixtures of N2, CO2, SF6, C4F6,c-C4F8, C3F8, CBrClF2. The results generally agree to within 10% with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899684
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of xylitol and glucose metabolism in nonhepatic rat tissues (1976)
    Springer
    European journal of nutrition 15 (1976), S. 345-354 
    Details
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Es wurde untersucht, ob und in welchem Ausmaß eine Reihe isolierter, nicht-hepatischer Rattengewebe Xylit verwerten. Nur die Nierenschnitte waren in der Lage, Xylit signifikant zu verwerten, während bei Schnitten von Lunge, Hirn, Herz- und Skelettmuskulatur sowie bei Fettzellen weder mit enzymatischer Analytik noch mit Isotopentechniken eine Xylitaufnahme direkt nachweisbar war. Übereinstimmend mit diesem Ergebnis war der Einbau von Radioaktivität aus [U-14C]-Xylit in CO2 und Lactat außer bei den Nierenschnitten sehr gering und verglichen zum Einbau aus Glucose (=100%) weniger als 5%. Aus den Ergebnissen wird geschlossen, daß, abgesehen von der Leber, nur die Niere in der Lage ist, Xylit zu verwerten, während er für die anderen untersuchten Organe keine geeignetes Substrat darstellt.
    Notes: Summary Capability and extent of xylitol metabolism in vitro was studied in a variety of non-hepatic tissues of rats, using enzymatic and isotopic methods. Only kidney was found to be able to utilize xylitol at a significant rate while in all other organs tested — lung, brain, heart muscle, skeletal muscle and adipose tissue — no uptake of xylitol was detectable using two independent methods. In accordance with these results the incorporation of radioactivity from [U-14C]-xylitol as substrate into the products CO2 and lactate was found to be very small in all organs with the exception of kidney and when compared to that from [U-14C]-glucose it was less than 5%. From these results it is concluded that besides liver only kidney can utilize xylitol to a significant extent while for the other tissues studied xylitol is not a suitable substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020503
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Beam-foil spectrum of silicon in the extreme UV (1976)
    Springer
    The European physical journal 279 (1976), S. 127-133 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract UV-spectra of foil-excited Si ions accelerated to 20 MeV show 120 known lines of Si VIII-XIV and about 150 additional lines in the region 8–61 nm. 28 new classifications are proposed. Then=2 level scheme of Si X is revised. Two transitions are reassigned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437867
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Xylitstoffwechsel im menschlichen Erythrozyten (1975)
    Springer
    European journal of nutrition 14 (1975), S. 268-271 
    Details
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary 1. Washed human erythrocytes metabolize 1,14μMol xylitol in 120 min under the following experimental conditions: pH 7.4 and 37° C. 2. The levels of 2,3-diphosphoglycerate and ATP decrease during the incubation with xylitol. This decrease is not a specific effect of xylitol, but depends on the amount of C-atoms taken up. This could be shown in control experiments with fructose and glucose as substrates given separated or in combination with xylitol. The highest uptake of C-atoms has been observed with glucose plus xylitol as substrate. 3. 99% of the metabolized xylitol was recovered in the products lactate, Co2 and D-xylulose. 4. There was no measurable oxalate production from xylitol.
    Notes: Zusammenfassung 1. Gewaschene, menschliche Erythrozyten verstoffwechseln unter experimentellen Bedingungen (pH 7,4, 37° C) 1,14μMol Xylit in 120 min. 2. Der 2,3-DPG- und ATP-Spiegel fällt während der Inkubation mit Xylit ab. Dieser Abfall ist keine spezifische Wirkung des Xylits, sondern hängt von der Menge der aufgenommenen C-Atome ab. Dies zeigten Vergleichsuntersuchungen mit den Substraten Fruktose und Glukose allein und in Kombination mit Xylit. Die höchste Aufnahme an C-Atomen wurde mit Glukose+Xylit als Substrat erreicht. 3. Der verstoffwechselte Xylit wurde zu 99% in den Produkten Laktat, CO2 und D-Xylulose wiedergefunden. 4. Eine Oxalatbildung aus Xylit konnte nicht nachgewiesen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02025864
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    Paper (German National Licenses)
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