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  • Chemistry  (9)
  • Czech Republic  (2)
  • Atlantis II Deep brines
  • CR: G1.3
  • 1
    Electronic Resource
    Electronic Resource
    On the monotonity of incomplete factorization (1990)
    Springer
    Numerische Mathematik 57 (1990), S. 473-479 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65F10 ; CR: G1.3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The Meijerink, van der Vorst type incomplete decomposition uses a position set, where the factors must be zero, but their product may differ from the original matrix. The smaller this position set is, the more the product of incomplete factors resembles the original matrix. The aim of this paper is to discuss this type of monotonity. It is shown using the Perron Frobenius theory of nonnegative matrices, that the spectral radius of the iteration matrix is a monotone function of the position set. On the other hand no matrix norm of the iteration matrix depends monotonically on the position set. Comparison is made with the modified incomplete factorization technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386424
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence from zircon dating for existence of approximately 2.1 Ga old crystalline basement in southern Bohemia, Czech Republic (1993)
    Springer
    International journal of earth sciences 82 (1993), S. 42-50 
    Details
    ISSN: 1437-3262
    Keywords: Zircon dating ; Sphene dating ; Bohemian Massif ; Orthogneisses ; Czech Republic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Zircon ages are reported for three Moldanubian amphibolite grade orthogneisses from the southern Bohemian Massif obtained by conventional U/Pb analyses. For two of these orthogneisses, conventional U/Pb data are supported by ion microprobe single zircon ages or single grain evaporation data. The amphibolite grade orthogneisses, occurring in three small tectonic lenses within the Varied Group close to the South Bohemian Main Thrust, are of tonalitic, granodioritic or quartz dioritic composition. Conventional bulk size fraction and ion microprobe analyses of nearly euhedral zircons from a metatonalite, erroneously interpreted as a metagreywacke in a previous study, yielded an upper Concordia intercept age of 2048 ± 12 Ma. The well preserved euhedral grain shapes of the zircons suggest crystallization from a magmatic phase, and the upper Concordia intercept age is now interpreted as reflecting a magmatic event at that time. The age of this rock is compatible with the conventional zircon data and the (207Pb/206Pb)* single grain evaporation result from two further orthogneisses providing intrusion ages of 2 060 ± 12, 2 104 ± 1 and 2 061 ± 6 Ma, respectively. For one sample a concordant U/Pb age for sphene of 355 ± 2 Ma defines the age of amphibolite facies metamorphism. The upper Concordia intercept ages of three orthogneisses constitute the first direct evidence for the presence of early Proterozoic crust under the supracrustal cover in the southern part of the Bohemian Massif.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00563269
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  • 3
    Electronic Resource
    Electronic Resource
    Flexistipes sinusarabici, a novel genus and species of eubacteria occurring in the Atlantis II Deep brines of the Red Sea (1990)
    Springer
    Archives of microbiology 154 (1990), S. 120-126 
    Details
    ISSN: 1432-072X
    Keywords: Flexistipes ; Eubacteria ; Atlantis II Deep brines ; Red Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four isolates of a gram-negative flexible bacterium have been obtained from brine water samples of the Atlantis II Deep of the Red Sea at a depth of 2000 m. One isolate (MAS 10) was studied in detail. Cells are nonmotile, flexible rods, measuring about 0.3 μm in width and 5 to 50 μm in length. The new organisms are heterotrophs growing anaerobically on yeast extract, meat extract, peptone, tryptone, and, less efficiently, on acetate and casamino acids. Growth occurs between 30% and 53°C at pH 6 to 8 in the presence of at least 3% NaCl. The shortest doubling time is 8.5 h under optimal growth conditions. Cells are sensitive to the antibiotics penicillin, ampicillin, vancomycin, and streptomycin, but resistant to tetracyclin and rifamipicin. The GC-content of the DNA is 39 mol%. Based on their 16S rRNA the new isolates group with the general cluster of eubacterial phyla. Since they show no specific relationship to any of them, a new genus is described, which is named Flexistipes, the flexible stick. Type species is Flexistipes sinusarabici strain MAS 10 (DSM 4947).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423320
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  • 4
    Electronic Resource
    Electronic Resource
    Diagnostika Sostava Materialov Rentgenodifrakcionnimi I Spektralnymi Metodami (Identification of materials by X-ray diffraction and spectroscopical Techniques) (in Russian), M. S. Nakhmanson and V. G. Feklitschev, Mashinostroenie, Leningrad, 1990. 357 pages. ISBN 5-217-00915-2, Rubl 5.40 (1991)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 5 (1991), S. 546-547 
    Details
    ISSN: 0886-9383
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180050608
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  • 5
    Electronic Resource
    Electronic Resource
    Zircon dating of North Bohemian granulites, Czech Republic: further evidence for the Lower Carboniferous high-pressure event in the Bohemian Massif (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 154-161 
    Details
    ISSN: 0016-7835
    Keywords: Key words HP granulites ; Zircon dating ; Rutile dating ; Lower Carboniferous ; N Bohemia ; Czech Republic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  U–Pb zircon and rutile multigrain ages and 207Pb/206Pb zircon evaporation ages are reported from high-pressure felsic and metapelitic granulites from northern Bohemia, Czech Republic. The granulites, in contrast to those from other occurrences in the Bohemian Massif, do not show evidence of successive HT/MP-LP overprints. Multigrain size fractions of nearly spherical, multifaceted, metamorphic zircons from three samples are slightly discordant and yield a U–Pb Concordia intercept age of 348±10 Ma, whereas single zircon evaporation of two samples resulted in 207Pb/206Pb ages of 339±1.5 and 339±1.4 Ma, respectively. A rutile fraction from one sample has a U–Pb Concordia intercept age of 346±14 Ma. All ages are identical, within error, and a mean age of 342±5 Ma was adopted to reflect the peak of HP metamorphism. Because rutile has a lower closing temperature for the U–Pb isotopic system than zircon, the results and the P–T data imply rapid uplift and cooling after peak metamorphism. The above age is identical to ages for high-grade metamorphism reported from the southern Bohemian Massif and the Granulite Massif in Saxony. It can be speculated that all these granulites were part of the same lower crustal unit in early Carboniferous, being separated later due to crustal stacking and subsequent late Variscan orogenic collapse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192073
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  • 6
    Electronic Resource
    Electronic Resource
    Nucleophilic Chlorination of 3-Formyl-4-hydroxy-quinolin-2(1H)-ones (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 128-134 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chlorination of 1-substituted 3-formyl-4-hydroxy-2-quinolones (1a, b) with phosphorylchloride leads to 4-chloro-3-dichloromethylquinolones (2), which can be hydrolyzed to 4-chloro-3-formyl-quinolones (4). From the anilinomethylene quinolinediones (3), at low temperatures the formylquinolones 4 can be obtained directly, whereas at high temperatures cleavage of the tautomeric azomethine moiety followed by subsequent ring closure to the naphthyridines (7) takes place. With 1-unsubstituted 3-formyl-4-hydroxy-2-quinolones (1d) either the 3-dichloromethylquinolone (2d) or the 2,4-dichloro-3-dichloro-methylquinoline (10) is obtained depending on the reaction conditions. Similar results are obtained with the 1-unsubstituted anilinomethylene compounds (3). Attempts to obtain the 3-formyl-2,4-dichloroquinoline (11) were unsuccessful because in all experiments the 2-chloro-group was converted to an oxygen function.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350203
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  • 7
    Electronic Resource
    Electronic Resource
    Umsetzung von benzoesäureglycidylester mit primären und sekundären aminen in alkohol als lösungsmittel (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 154 (1972), S. 81-88 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The reaction course of glycidyl benzoate with aliphatic, aromatic, heterocyclic primary and secondary amines and imidazol in the presence of isobutanol has been studied. The reaction of glycidyl compounds with amines has a termolecular mechanism. In the presence of an alcohol the reaction is pseudobimolecular. The basic dissociation constant of the amine can be applied for the determination of the approximate velocity constant for the reaction of glycidyl benzoate with amines. A greater deviation from the dependence between the dissociation constant of an amine and the velocity constant of the reaction was found with benzylamine. The activation energy of the reaction of glycidyl benzoate with amines has been determined.
    Notes: Die Umsetzung von Benzoesäureglycidylester mit aliphatischen, aromatischen und heterocyclischen primären und sekundären Aminen in Gegenwart von Isobutylalkohol wurde studiert. Die Reaktion der Glycidylverbindungen mit Aminen verläuft nach einem termolekularen Mechanismus. In Alkohol als Lösungsmittel wird ein pseudobimolekularer Reaktionsverlauf ermittelt. Die basische Dissoziationskonstante des Amins kann zur Bestimmung der approximativen Geschwindigkeitskonstante der Benzoesäureglycidylester-Amin-Reaktion verwendet werden. Eine größere Abweichung von der Abhängigkeit zwischen der Dissoziationskonstante des Amins und der Geschwindigkeitskonstante der Umsetzung wurde beim Benzylamin gefunden. Die Aktivierungsenergie für die Reaktion von Benzoesäureglycidylester mit Aminen wurde bestimmt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021540107
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  • 8
    Electronic Resource
    Electronic Resource
    Benzyldimethylamin-katalysierte Copolyaddition von Benzoesäureglycidylester mit Hexahydrophthalsäureanhydrid (1971)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 20 (1971), S. 103-110 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The benzyl dimethylamine catalyzed copolyaddition of glycidyl benzoate with hexahydrophthalic anhydride has been investigated. The orders of reaction towards hexahydrophthalic anhydride, glycidyl benzoate and benzyl dimethylamine have been determined. The activation energy of the reaction has been determined from the reaction rate constant/temperature dependence. It has been found that the reaction mechanism is strongly influenced by the catalytic amine concentration as well as by the fact that practically all amine is complexed. A reaction mechanism has been suggested.
    Notes: Die mit Benzyldimethylamin katalysierte Copolyaddition von Benzoesäureglycidylester mit Hexahydrophthalsäureanhydrid wurde untersucht. Dazu wurde die Reaktionsordnung für Hexahydrophthalsäureanhydrid, Benzoesäureglycideylester und Benzyldimethylamin bestimmt. Aus der Abhängigkeit der Reaktionsgeschwindigkeitskonstante von der Temperatur wurde die Aktivierungsenergie der Readtion ermittelt. Der Reaktionsmechanismus wird durch die katalytische Konzentration des Amins und durch die Tatsache, daß praktisch das gesamte Amin in Komplexe eingebaut wird, stark beeinflußt. Ein Reaktionsmechanisums wurde entworfen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1971.050200108
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  • 9
    Electronic Resource
    Electronic Resource
    Reaction of glycidyl benzoate with acid in the presence of tertiary amines as the catalyst (1970)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 12 (1970), S. 157-165 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Umsetzung von Epoxydverbindungen mit Carbonsäuren unter der Katalyse mit tertiären Aminen diskutiert. Auf Grund von experimentellen Resultaten wurde der Reaktionsmechanismus am Beispiel der Umsetzung von Glycidylbenzoat mit Benzoesäure unter der Katalyse durch Benzyldimethylamin in Xylol abgeleitet und bestätigt. Die Umsetzung verläuft nach einem kombinierten Ionenmechanismus und über Komplexbildung. Damit können die abnormale Abhängigkeit der Reaktionskonstante von der Dielektrizitätskonstante des Mediums und die nicht ganzzahligen Ordnungen bezüglich Amin und Säure erklärt werden.
    Notes: The reaction of epoxides with carboxylic acids catalysed by tertiary amines has been discussed. The mechanism of the reaction has been deduced and confirmed, using experimental results, on the example of the reaction of glycidyl benzoate with benzoic acid in xylene, catalysed by benzyldimethylamine. The reaction occurs via a combined ionic mechanism as well as via a complex formation, thus explaining the abnormal dependence of the reaction constant on the dielectric constant of the milieu and the found non-integer orders of reaction with respect to the amine and to the acid.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1970.050120112
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  • 10
    Electronic Resource
    Electronic Resource
    Die polymerisation der lactame XIVXIII. Mitteilung: Eur. Polym. J. 12 (1976) 729. Einfluß des hexamethylguanidiniumchlorides auf die aktivierte anionische polymerisation der lactame (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 63 (1977), S. 105-116 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: It was proved that hexamethylguanidiniumchloride (HMGC) exhibited a pronounced accelerating effect on the activated anionic polymerization of 2-pyrrolidone (40°C) and 6-caprolactam initiated by alkali metal salts of the corresponding lactams. The accelerating effect of HMGC was not specific for a certain type of alkali metal salt of lactams as initiator, it was proved that the effect is operative for polymerization of 6-caprolactam when using sodium or cesium salt of 6-caprolactam. It was proved that HMGC does not form growing centers under reaction conditions studied. The initial polymerization rate in the homogeneous phase is a linear function of square root of HMGC concentration at constant concentrations of initiator and activator. On the basis of this finding it was possible to suggest a plausible mechanism of HMGC influence on the polymerization process.
    Notes: Es wurde eine beschleunigende Wirkung von Hexamethylguanidiniumchlorid (HMGC) auf die durch Alkalisalze der entsprechenden Lactame initiierte Polymeisation des 2-Pyrrolidons (40°C) sowie des 6-Caprolactams (CL) nachgewiesen. Diese beschleunigende Wirkung tritt nicht selektiv für einen bestimmten Typ des Alkalisalzes des Lactams als Initiator auf; sie wurde bei der Polymerisation des 6-Caprolactams bei Initiierung sowohl durch sein Natrium- als auch Cäsimsalz nachgewiesen. Es wurde festgestellt, daß HMGC unter diesen Bedingungen selst keine Wachsumszentren bildet. Bei konstanten Konzentrationen des Initiators und des Aktivators ist die Anfangsgeschwindigkeit der Polymeisation in homogener Phase eine lineare Funktion der Quadratwurzel der Konzentration des HMGC. Auf Grund dieser Tatsache konnte ein möglicher Mechanismus der Wirkung von HMGC im Polymerisationsprozeß vorgesclagen werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050630107
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