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  • 1
    Electronic Resource
    Electronic Resource
    Alkaline and ultramafic carbonate lamprophyres in Central Bohemian carboniferous basins, Czech Republic (1993)
    Springer
    Mineralogy and petrology 48 (1993), S. 65-81 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Alkalische und ultramafische Karbonat-Lamprophyrgänge (Monchiquit-Ouachitit und Aillikit) intrudieren in karbonische Sedimente Zentralböhmens. Sie sind charakterisiert durch das Auftreten von beträchtlichen Mengen an Mineralen der Sodalith-Gruppe (v.a. Haüyn), Karbonaten und Baryt. Ihre Isotopenzusammensetzung von⊙ 13C (−3.4 bis −6.2‰) undδ 18O (13.5 bis 15.9‰) zeigt, daß die Karbonate primär magmatischen Ursprungs sind und daß assoziierte Fluide in einem Temperaturbereich von 350 bis 500°C gebildet wurden. Hohe Gehalte an CO2 (3.6 bis 17.6 Gew. %), inkompatiblen Elementen, hohe LREE/HREE-Verhältnisse (30.0 bis 57.7), sowie niedrige Rb/Sr—(0.025 bis 0.078) und87Sr/86Sr-(0.7038 bis 0.7042) Verhältnisse lassen vermuten, daß die ultramafischen Lamprophyre mit karbonatischen Magmen des Mantels in Beziehung stehen. Eine niedrige Aufschmelzungsrate ( 〈 1%) von Mantelperidotit mit zusätzlichem Transport von, an inkompatiblen Elementen angereicherten Fluiden, in die krustale Magmenkammer wird diskutiert. Alkalische Lamprophyre sind als stärker fraktionierte Magmen, die derselben Quelle entstammen, zu verstehen. Die Intrusion der aus verschiedenen Bereichen der Magmenkammer stammenden Magmen in durch horizontale Dehnung verursachte Störungszonen könnte das Fehlen eines zentralen Intrusionskörpers und die unterschiedliche Zusammensetzung der Lamprophyre (Kumulate oder entwickelte Derivate) erklären.
    Notes: Summary Dykes of alkaline and ultramafic carbonate lamprophyres (monchiquite-ouachitite and aillikite) intrude the Carboniferous sediments of Central Bohemia. Their characteristic feature is the presence of substantial amounts of a sodalite group mineral (presumably haüyne), carbonate and barite. Isotopic compositions ofδ 13C (−3.4 to −6.2‰) andδ 18O ( + 13.5 to + 15.9‰) indicate that the carbonate is of primary magmatic origin and that fluids were formed at temperatures of 500 to 350°C. High contents of CO2 (3.6 to 17.6 wt.%) and incompatible elements, high LREE/HREE ratios (30.0 to 57.7), and low Rb/Sr (0.025 to 0.078) and87Sr/86Sr (0.7038 to 0.7042) ratios suggest the ultramafic lamprophyres are related to deep-seated carbonated magmas of mantle origin. Low degree of partial melting ( 〈 1%) of the mantle peridotite is envisaged, with additional transport of fluids rich in incompatible elements into the crustal chamber. Alkaline lamprophyres are fractionated derivatives which originated from the same source. Magma intrusion from different levels of a magma chamber into fracture zones under horizontal tension without a central intrusion could result in variability in lamprophyre composition (cumulates or evolved derivatives).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01164909
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  • 2
    Electronic Resource
    Electronic Resource
    Epigenetic dolomitization of the Přaídolí formation (Upper Silurian), the Barrandian basin, Czech Republic: implications for burial history of Lower Paleozoic strata (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 264-277 
    Details
    ISSN: 1437-3262
    Keywords: Dolomitization ; Burial diagenesis ; Oil window ; Saddle dolomite ; Barrandian basin ; Bohemian massif ; Vitrinite reflectance ; Fluid inclusions ; Illite crystallinity ; Thermal history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Stratabound epigenetic dolomite occurs in carbonate facies of the Barrandian basin (Silurian and Devonian), Czech Republic. The most intense dolomitization is developed in bioclastic calcarenites within the transition between micritic limestone and shaledominated Přídolí and Lochkov formations deposited on a carbonate slope. Medium-crystalline (100–400 µm), inclusion-rich, xenotopic matrix dolomite (δ 18O=−4.64 to −3.40‰ PDB;δ 13C=+1.05 to +1.85‰ PDB) which selectively replaced most of the bioclastic precursor is volumetrically the most important dolomite type. Coarse crystalline saddle dolomite (δ 18O=−8.04 to −5.14‰ PDB;δ 18C=+0.49 to +1.49 PDB) which precipitated in fractures and vugs within the matrix dolomite represents a later diagenetic dolomitization event. In some vugs, saddle dolomite coprecipitated with petroleum inclusion-rich authigenic quartz crystals and minor sulfides which, in turn, were post-dated by semisolid asphaltic bitumen. The interpretation of the dolomitization remains equivocal. Massive xenotopic dolomite, although generally characteristic of a deeper burial setting, may have been formed by a recrystallization of an earlier, possibly shallow burial dolomite. Deeper burial recrystallization by reactive basinal pore fluids that presumably migrated through the more permeable upper portion of the Přídolí sequence appears as a viable explanation for this dolomitization overprint. Saddle dolomite cement of the matrix dolomite is interpreted as the last dolomitization event that occurred during deep burial at the depth of the oil window zone. The presence of saddle dolomite, the fluid inclusion composition of associated quartz crystals, and vitrinite paleogeothermometry of adjacent sediments imply diagenetic burial temperatures as high as 160°C. Although high geothermal gradients in the past or the involvement of hydrothermally influenced basinal fluids can account for these elevated temperatures, burial heating beneath approximately 3-km-thick sedimentary overburden of presumably post-Givetian strata, no longer preserved in the basin, appears to be the most likely interpretation. This interpretaion may imply that the magnitude of post-Variscan erosion in the Barrandian area was substantially greater than previously thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422233
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of human blood T lymphocytes labeled with monoclonal antibodies (1985)
    Springer
    Bulletin of experimental biology and medicine 100 (1985), S. 1438-1440 
    Details
    ISSN: 1573-8221
    Keywords: subpopulations of T lymphocytes ; electron microscopy of lymphocytes ; monoclonal antibodies ; immunomorphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00837884
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  • 4
    Electronic Resource
    Electronic Resource
    Immunobiology of gonococcal outer membrane protein I (1987)
    Springer
    Antonie van Leeuwenhoek 53 (1987), S. 461-464 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Monoclonal antibodies have been obtained which react with gonococcal outer membrane protein I. One antibody recognised the majority of strains expressing P.IA and another recognised the majority of strains expressing P.IB. In in vitro tests both antibodies were bactericidal in the presence of complement, opsonic for phagocytosis by human PMN and protected epithelial cells against gonococcal invasion. Thus conserved epitopes on P.I. are potentially effective targets for immunoprophylaxis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415503
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  • 5
    Electronic Resource
    Electronic Resource
    Epigenetic dolomitization of the Přídolí formation (Upper Silurian), the Barrandian basin, Czech Republic: implications for burial history of Lower Paleozoic strata (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 264-277 
    Details
    ISSN: 0016-7835
    Keywords: Key words Dolomitization ; Burial diagenesis ; Oil window ; Saddle dolomite ; Barrandian basin ; Bohemian massif ; Vitrinite reflectance ; Fluid inclusions ; Illite crystallinity ; Thermal history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Stratabound epigenetic dolomite occurs in carbonate facies of the Barrandian basin (Silurian and Devonian), Czech Republic. The most intense dolomitization is developed in bioclastic calcarenites within the transition between micritic limestone and shale-dominated Přídolí and Lochkov formations deposited on a carbonate slope. Medium-crystalline (100–400 μm), inclusion-rich, xenotopic matrix dolomite (δ18O=–4.64 to –3.40ö PDB;δ13C=+1.05 to +1.85ö PDB) which selectively replaced most of the bioclastic precursor is volumetrically the most important dolomite type. Coarse crystalline saddle dolomite (δ18O=–8.04 to –5.14ö PDB;δ18C=+0.49 to +1.49 PDB) which precipitated in fractures and vugs within the matrix dolomite represents a later diagenetic dolomitization event. In some vugs, saddle dolomite coprecipitated with petroleum inclusion-rich authigenic quartz crystals and minor sulfides which, in turn, were postdated by semisolid asphaltic bitumen. The interpretation of the dolomitization remains equivocal. Massive xenotopic dolomite, although generally characteristic of a deeper burial setting, may have been formed by a recrystallization of an earlier, possibly shallow burial dolomite. Deeper burial recrystallization by reactive basinal pore fluids that presumably migrated through the more permeable upper portion of the Přídolí sequence appears as a viable explanation for this dolomitization overprint. Saddle dolomite cement of the matrix dolomite is interpreted as the last dolomitization event that occurred during deep burial at the depth of the oil window zone. The presence of saddle dolomite, the fluid inclusion composition of associated quartz crystals, and vitrinite paleogeothermometry of adjacent sediments imply diagenetic burial temperatures as high as 160  °C. Although high geothermal gradients in the past or the involvement of hydrothermally influenced basinal fluids can account for these elevated temperatures, burial heating beneath approximately 3-km-thick sedimentary overburden of presumably post-Givetian strata, no longer preserved in the basin, appears to be the most likely interpretation. This interpretaion may imply that the magnitude of post-Variscan erosion in the Barrandian area was substantially greater than previously thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050073
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  • 6
    Electronic Resource
    Electronic Resource
    Some mechanisms of stimulation of erythropoiesis by T lymphocytes during local irradiationin vivo (1984)
    Springer
    Bulletin of experimental biology and medicine 98 (1984), S. 1128-1130 
    Details
    ISSN: 1573-8221
    Keywords: T lymphocyte ; stimulation ; erythropoiesis ; irradiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01262487
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  • 7
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    New constraints on the Polish moldavite finds: a separate sub-strewn field of the central European tektite field or re-deposited materials? (2016)
    Czech Geological Society
    Details
    Publication Date: 2016-10-17
    Print ISSN: 1802-6222
    Electronic ISSN: 1803-1943
    Topics: Geosciences
    Published by Czech Geological Society
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  • 8
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    Conducting blends of polyaniline with conventional polymers (1997)
    Elsevier
    Details
    Publication Date: 1997-01-01
    Print ISSN: 0379-6779
    Electronic ISSN: 1879-3290
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 9
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    The effect of yttrium addition on the chemical composition of the non-metallic phase in liquid steel (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-12-11
    Description: The introduction of yttrium as an alloy additive to steel is connected with the formation of non-metallic inclusions resulting in the losses of this element. The presence of yttrium is expected to minimize the precipitation processes caused by sulphur and oxygen in steel. Therefore the order in which the additives are introduced during refining processes decides about yttrium final content in steel in bounded and dissolved form. For defining the amount of the generated non-metallic phase and kinetics of deoxidation and desulphurization processes authors used a non-commercial computer program based on the worked out calculation models. The process was analyzed in view of the order of introducing additives: Al, Y and Ca to preliminarily deoxidized steel. It was revealed that yttrium dosing is connected with the formation of oxide and sulphide phases. The introduction of yttrium prior to aluminium brings about huge losses, mainly as far as oxides formation is concerned. In the case...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 10
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    The behaviour of Al 2 O 3 precipitation at the steel-slag interface (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-12-11
    Description: The paper focuses on the numerical investigation of the Al 2 O 3 precipitation behaviour at the steel-slag phases interface. Several assumptions were made to simplify the process in order to prepare its description. A mathematical model of the steel-slag-precipitation system was introduced. The model base on the equation of motion, and takes into account forces balance of buoyancy force, added mass force, drag force and rebound force. Mentioned forces act in the same direction which is perpendicular with the steel-slag interface surface, but is positive or negative. The precipitation initial velocity can be calculated on the base of steel and inclusion density, liquid steel viscosity and particle radius. The numerical model based on the firstly prepared mathematical model was presented. Results of the computations show what is the precipitation radius size influence on particle movement and its assimilation to the slag.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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