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  • 1
    Electronic Resource
    Electronic Resource
    Absorption und Streuung von Licht an Eisenoxyd-Aerosolen (1957)
    Springer
    Colloid & polymer science 154 (1957), S. 117-119 
    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 Das Absorptions- und Streuverhalten von Fe3O4-Rauch, der bei der Stahlerzeugung im Thomaskonverter in größeren Mengen auftritt, wird nach der Mieschen Theorie streng berechnet. Die Werte für die Absorptions- und Extinktionskonstanten sowie für die Richtungsabhängigkeit der Streustrahlung werden für Rauchteilchendurchmesser von 20 bis 100 mμ mitgeteilt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01520158
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  • 2
    Electronic Resource
    Electronic Resource
    Corroding iron as a hydrogen source for sulphate reduction in growing cultures of sulphate-reducing bacteria (1986)
    Springer
    Applied microbiology and biotechnology 25 (1986), S. 169-174 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In anaerobic corrosion experiments, hydrogenase-positiveDesulfovibrio strains, grown with limiting lactate concentrations in the presence of steel wool, formed more sulphide than expected or observed with lactate alone. The additional sulphide obviously originated from sulphate reduction with cathodically formed hydrogen from the steel surface. The hydrogenasenegativeD. sapovorans did not produce additional sulphide. The observations agree with the theory of von Wolzogen Kühr and van der Vlugt (1934) that explains anaerobic corrosion as a cathodic depolarization of iron surfaces by hydrogen-consuming sulphate-reducing bacteria. The influence of the iron surface area, the salt concentration and the pH-value on the utilization of cathodically formed hydrogen was investigated. The significance of an additional organic electron donor for the corrosion of iron in aqueous environments is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01982842
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  • 3
    Electronic Resource
    Electronic Resource
    Plate boundary deformation and continuing deflation of the Askja volcano, North Iceland, determined with GPS, 1987–1993 (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 136-145 
    Details
    ISSN: 1432-0819
    Keywords: Key words GPS ; Askja central volcano ; Caldera ; Deformation ; Plate boundary zone ; Magma chamber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  GPS geodetic measurements were conducted around the Askja central volcano located at the divergent plate boundary in north Iceland in 1987, 1990, 1992 and 1993. The accuracy of the 1987 and 1990 measurements is in the range of 10 mm for horizontal components; the accuracy of the 1992 and 1993 measurements is about 4 mm in the horizontal plane. Regional deformation in the Askja region is dominated by extension. Points located outside a 30–45 km wide plate boundary deformation zone indicate a displacement of 2.4±0.5 cm/a in the direction N 99° E±12° of the Eurasian plate relative to the North American plate in the period 1987–1990. Within the plate boundary deformation zone extensional strain accumulates at a rate of ∼0.8 μstrain/a. Displacement of control points next to Askja (〈7 km from the caldera center) in the periods 1990–1993 and 1992–1993 show deflation and contraction towards the caldera. These results are in accordance with the results obtained by other geodetic methods in the area, which indicate that the deflation at Askja occurs in response to a pressure decrease at about 2.8 km depth, located close to the center of the main Askja caldera. A Mogi point source was fixed at this location and the GPS data used to solve for the source strength. A central subsidence of 11±2.5 cm in the period 1990–1993 is indicated, and 5.5±1.5 cm in the period 1992–1993. The maximum tensional strain rate, according to the point source model, occurs at a horizontal distance of 2.5–6 km from the source, at the same location as the main caldera boundary. Discrepancies between the observed displacements and predicted displacements from the Mogi model near the Askja caldera can be attributed to the regional east–west extension that occurs at Askja.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301404
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  • 4
    Electronic Resource
    Electronic Resource
    Note on the Reaction of the Upper Atmosphere Potassium Layer to the 1999 Leonid Meteor Storm (1998)
    Springer
    Earth, moon and planets 82-83 (1998), S. 555-564 
    Details
    ISSN: 1573-0794
    Keywords: lower thermosphere ; Leonids 1999 ; mesosphere ; meteors ; neutral atom debris layer ; Potassium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We have performed an experiment to study the impact of the 1999 Leonid meteor storm on the upper atmosphere potassium layer. For the experiment, we used a ground-based K-lidar located at the Observatorio del Teide on the island of Tenerife (28°N, 17°W). As is now known from external sources, the activity of the storm exhibited a sharp peak of activity on November 18, 1999 close to 02:05 UT with a full width at half maximum of only 45 min. Due to unfavorable weather conditions at our lidar site, we could not observe the behavior of the K layer immediately before or during the meteor storm. However, about 1 h past the peak of the Leonid storm, the clouds above the site started to show small holes. Hence, between 03:24 and 05:22 UT, we were able to perform lidar soundings of the K layer above our site. From those we can conclude that the 1999 Leonid meteor storm has not led to an outstanding enhancement of the upper atmosphere potassium layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017085305760
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  • 5
    Electronic Resource
    Electronic Resource
    Plate boundary deformation and continuing deflation of the Askja volcano, North Iceland, determined with GPS, 1987–1993 (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 136-145 
    Details
    ISSN: 1432-0819
    Keywords: GPS ; Askja central volcano ; Caldera ; Deformation ; Plate boundary zone ; Magma chamber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract GPS geodetic measurements were conducted around the Askja central volcano located at the divergent plate boundary in north Iceland in 1987, 1990, 1992 and 1993. The accuracy of the 1987 and 1990 measurements is in the range of 10 mm for horizontal components; the accuracy of the 1992 and 1993 measurements is about 4 mm in the horizontal plane. Regional deformation in the Askja region is dominated by extension. Points located outside a 30–45 km wide plate boundary deformation zone indicate a displacement of 2.4±0.5 cm/a in the direction N 99°E±12° of the Eurasian plate relative to the North American plate in the period 1987–1990. Within the plate boundary deformation zone extensional strain accumulates at a rate of ∼0.8 μstrain/a. Displacement of control points next to Askja (〉7 km from the caldera center) in the periods 1990–1993 and 1992–1993 show deflation and contraction towards the caldera. These results are in accordance with the results obtained by other geodetic methods in the area, which indicate that the deflation at Askja occurs in response to a pressure decrease at about 2.8 km depth, located close to the center of the main Askja caldera. A Mogi point source was fixed at this location and the GPS data used to solve for the source strength. A central subsidence of 11±2.5 cm in the period 1990–1993 is indicated, and 5.5±1.5 cm in the period 1992–1993. The maximum tensional strain rate, according to the point source model, occurs at a horizontal distance of 2.5–6 km from the source, at the same location as the main caldera boundary. Discrepancies between the observed displacements and predicted displacements from the Mogi model near the Askja caldera can be attributed to the regional eastwest extension that occurs at Askja.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301404
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  • 6
    Electronic Resource
    Electronic Resource
    Programs, databases, and expert systems for human geneticists — a survey (1996)
    Springer
    Human genetics 〈Berlin〉 97 (1996), S. 129-137 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We present an overview of the variety of databases and programs that offer substantial aid to medical and molecular geneticists. Databases and expert systems for genetic diseases and birth defects, programs for segregation and linkage analysis, certain DNA and protein sequence databases, and information resources in general for molecular biology are addressed. These systems cannot be used effectively without the newly developed techniques of information exchange based on international computer networks. A short introduction is given to the Internet and to European institutions and organizations that offer help with the aquisition and use of bioinformatic resources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265253
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  • 7
    Electronic Resource
    Electronic Resource
    Programs, databases, and expert systems for human geneticists – a survey (1996)
    Springer
    Human genetics 〈Berlin〉 97 (1996), S. 129-137 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We present an overview of the variety of databases and programs that offer substantial aid to medical and molecular geneticists. Databases and expert systems for genetic diseases and birth defects, programs for segregation and linkage analysis, certain DNA and protein sequence databases, and information resources in general for molecular biology are addressed. These systems cannot be used effectively without the newly developed techniques of information exchange based on international computer networks. A short introduction is given to the Internet and to European institutions and organizations that offer help with the aquisition and use of bioinformatic resources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265253
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  • 8
    Electronic Resource
    Electronic Resource
    Corroding iron as a hydrogen source for sulphate reduction in growing cultures of sulphate-reducing bacteria (1986)
    Springer
    Applied microbiology and biotechnology 25 (1986), S. 169-174 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In anaerobic corrosion experiments, hydrogenase-positiveDesulfovibrio strains, grown with limiting lactate concentrations in the presence of steel wool, formed more sulphide than expected or observed with lactate alone. The additional sulphide obviously originated from sulphate reduction with cathodically formed hydrogen from the steel surface. The hydrogenasenegativeD. sapovorans did not produce additional sulphide. The observations agree with the theory of von Wolzogen Kühr and van der Vlugt (1934) that explains anaerobic corrosion as a cathodic depolarization of iron surfaces by hydrogen-consuming sulphate-reducing bacteria. The influence of the iron surface area, the salt concentration and the pH-value on the utilization of cathodically formed hydrogen was investigated. The significance of an additional organic electron donor for the corrosion of iron in aqueous environments is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938942
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  • 9
    Electronic Resource
    Electronic Resource
    Interspecific hydrogen transfer during methanol degradation by Sporomusa acidovorans and hydrogenophilic anaerobes (1986)
    Springer
    Archives of microbiology 144 (1986), S. 163-165 
    Details
    ISSN: 1432-072X
    Keywords: Methanogenesis ; Sulfidogenesis ; Homoacetogenesis ; Competition for H2 ; Sporomusa acidovorans ; Interspecies hydrogen transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the presence of active hydrogenophilic sulfate-reducing bacteria, the homoacetogenic bacterium Sporomusa acidovorans did not produce acetate during methanol degradation. H2S and presumably CO2 were the only end products. Since the sulfate-reducer did not degrade methnol or acetate, the sulfidogenesis from methanol was related to a complete interspecific hydrogen transfer between both species. In coculture with hydrogenophilic methanogenic bacteria (Methanobacterium formicicum, Methanospirillum hungatei), the interspecific hydrogen transfer with S. acidovorans was incomplete. Beside CH4 and presumably CO2, acetate was produced. The results suggested that H2-production and H2-consumption were involved during anaerobic methanol degradation by S. acidovorans and the hydrogenophilic anaerobes play an important role during methanol degradation by homoacetogenic bacteria in anoxic environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414728
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of Desulfovibrio fructosovorans sp. nov. (1988)
    Springer
    Archives of microbiology 149 (1988), S. 447-450 
    Details
    ISSN: 1432-072X
    Keywords: Sulfate reduction ; Fermentation ; Fructose ; Desulfovibrio fructosovorans sp. nov.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Desulfovibrio strain JJ isolated from estuarine sediment differed from all other described Desulfovibrio species by the ability to degrade fructose. The oxidation was incomplete, leading to acetate production. Fructose, malate and fumarate were fermented mainly to succinate and acetate in the absence of an external electron acceptor. The pH and temperature optima for growth were 7.0 and 35° C respectively. Strain JJ was motile by means of a single polar flagellum. The DNA base composition was 64.13% G+C. Cytochrome c 3 and desulfoviridin were present. These characteristics established the isolate as a new species of the genus Desulfovibrio, and the name Desulfovibrio fructosovorans is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425586
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