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  • 1975-1979  (5)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of ribonuclease on the replicative forms of Sindbis virus RNA (1979)
    Springer
    Archives of virology 60 (1979), S. 131-146 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three species of double-stranded RNA, designated RF I, RF II, and RF III in order of decreasing size (25), are produced by ribonuclease treatment of extracts of chicken embryo cells infected for 6 hours with Sindbis virus. Only one class of replicative form RNA is present in extracts not treated with ribonuclease; this class contains some molecules which can be enzymatically cleaved to produce the other two replicative forms. At a low level of enzyme (0.001 µg/ml) the major species obtained was RF I, the replicative form of the genome. When the enzyme concentration was increased 10-, 100-, and 1000-fold, there was a progressive increase in the proportions of RF's II and III and a concomitant decrease in the proportion of RF I. The generation of RF's II and III by nuclease resulted in the ratio expected for these two species if they are produced by cleavage of RF I-like molecules. In preparations of isolated double-stranded RNA, only RF I and replicative intermediate RNA were present. Mild nuclease treatment of these preparations converted the replicative intermediates primarily to RF I. Higher enzyme levels generated greater proportions of RF II and RF III, but RF I-like molecules were the major source for these increased proportions. Treatment of the isolated naturally occurring replicative form with 0.01 µg of ribonuclease per ml cleaved some molecules migrating as RF I during gel electrophoresis into molecules which migrated as RF II and RF III.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01348029
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the change of polarization of positive muons in alkali halides (1975)
    Springer
    The European physical journal 22 (1975), S. 109-115 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positive muons implanted in nonconducting solids form with high probability hydrogenlike muonium atoms (µ + e −) with properties similar to those ofU 2-centers. The influence of superhyperfine interactions with neighbor nuclei on the evolution of the polarization of the muon is investigated theoretically. The resulting muon polarization in longitudinal magnetic fields is calculated for muonicU 2-centers in some alkali halides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322352
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ermittlung der Wärmeübergangszahl beim Erspinnen monofiler Fäden aus der Schmelze bei freier Konvektion (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 1156-1164 
    Details
    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 Mit in der Literatur veröffentlichten Angaben wird der Fadenbildungsvorgang aus der Schmelze für Polyamid 6 und Polyäthylenterephthalat bei der freien Konvektion untersucht. Mit dem Spinnwegx s, der dem Glasumwandlungspunkt zugeordnet ist, werden der mittlere Fadendurchmesser und die Oberfläche des Polymerstrahles bestimmt. Die mittlere Wärmeübergangszahl ergibt sich aus der Wärmemenge der Polymerschmelze des monofilen Fadens, die zur Oberfläche und zur mittleren Fadentemperatur ins Verhältnis gesetzt wird. Nach dem gefundenen Ergebnis ist die mittlere Wärmeübergangszahl zum mittleren Fadendurchmesser umgekehrt proportional. Für Polyamid 6 und Polyäthylenterephthalat sind Gleichungen angegeben, die zeigen, daß die mittlere Wärmeübergangszahl zur Wärmeleitzahl des jeweiligen Polymers proportional ist. Bei den 30 ausgewerteten Meßwetten aus der Literatur wird gefunden, daß die Fadenkühlung, die sich aus dem Verhältnis der mittleren Fadentemperatur zum Spinnwegx s ergibt, bei der freien Konvektion zur Durchsatzmenge des monofilen Fadens umgekehrt proportional ist. Der Nachweis wird geführt, wie relevant der Durchmesser der Kapillârbohrung der Düse für den mittleren Fadendurchmesser und damit die mittlere Wärmeübergangszahl ist. Gleichungen zur Berechnung des mittleren Fadendurchmessers, des Spinnwegesx s, der mittleren Wärmeübergangszahl und der Fadenkühlung sind angegeben. In der Abbildung 1 läßt sich zum mittleren Fadendurchmesser die mittlere Wärmeübergangszahl ablesen. Bei der freien Konvektion ist die mittlere Wärmeübergangszahl für Polyamid 6 größer als für Polyäthylenterephthalat. Die Fadenkühlung dagegen ist für Polyamid 6 kleiner als für Polyäthylenterephthalat, da der Wärmeinhalt des Polymerstrahles des monofilen Fadens bei Polyamid 6 größer ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447583
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    In-flight test of a continuous laser remote sensing system (1978)
    Springer
    Applied physics 15 (1978), S. 257-260 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 07.62
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An airborne laser system for remote sensing has been developed and tested at flight altitudes from 500 to 1200 m. The system is based on two continuous-wave CO2 lasers (output 3 W), tunable to different wavelengths, and detects the laser radiation scattered back from earth by heterodyne reception. The feasibility of the heterodyne reception technique under aircraft environment conditions was demonstrated, and man-made SF6 clouds and different types of uncovered minerals were traced. The data obtained indicate that the measuring range of the system can be increased to satellite distance by using a larger telescope and a more powerful laser and by reducing the electrical bandwidth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896105
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Acid precipitation effects on soil pH and base saturation of exchange sites (1977)
    Springer
    Water, air & soil pollution 7 (1977), S. 401-408 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The typical values and probable ranges of acid-precipitation are evaluated in terms of their theoretical effects on pH and cation exchange equilibrium of soils characteristic of the humid temperature region. The extent of probable change in soil pH and the time required to cause such a change are calculated for a range of common soils. Hydrogen ion input by acid precipitation is compared to cation inputs from nutrient cycling and other sources. For example it can be calculated that 100 yr of acid precipitation (10000 cm at pH 4.0) could be expected to shift the percentage base saturation in the top 20 cm of a typical midwestern forest soil location exchange capacity of 20 meq 100 g−1 downward 20%, thus lowering the pH of the Al horizon by approximately 0.6 units, if there are no countering inputs of basic materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284134
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    Paper (German National Licenses)
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