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  • 2000-2004  (1)
  • 1990-1994  (5)
  • 1950-1954  (2)
  • 1
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The study distinctly shows that structural changes take place in the silicate framework during the swelling process of glasses in aqueous solutions. The presence of a modified Q3 group is evidence for the exchange of protons and sodium ions; condensation reactions also take place. Using various techniques (1H NMR, infrared spectroscopy and thermal analysis) it has been demonstrated that water is present in the hydrated glass not only in the form of H2O molecules and silanol groups, but also in different structures of these two species. A molar H2O:SiOH ratio was found of approximately 1:1 (in agreement with the assumption that H3O+ ions of the solution and sodium ions of the glass are exchanged and ≡ SiOH and H2O are formed from the hydroxonium ions).
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  • 2
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cluster Analysis has been shown to be partially suitable for the classification of glasses. The expansion of the clusters on the Seger's diagram allows an investigation of the influence of the different glass components. Variation of the SiO2 content results in a smaller change of properties than variation of the Na2O/RO relationship. Principal Component Analysis is convenient for showing correlations between the composition of the examined glasses, the glass structure parameters, and the different electrode properties.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5406-5408 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An infinite staged Ettingshausen cooler of exponential shape has been constructed, using an oriented single crystal of Bi97Sb3. The magnetic field of B=0.75 T was provided by a permanent magnet system. A maximal temperature difference ΔT=42 K was achieved maintaining the heat sink at T=160 K. Referring to the temperature range and magnetic field strength used, this result represents a large cooling effect for an Ettingshausen cooling device. A simulation program that takes into account the temperature dependence of the transport coefficients was developed. Not only the predicted maximal temperature difference but also the electrical current necessary to obtain this maximum are in reasonable agreement with experimental results.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Kondensation von Benzylcyanid mit 3-Halogenpyridin sowie mit 6-Chlor-nicotinsäure-äthylester in Gegenwart von Natriumamid führte zu den entsprechenden Phenyl-pyridyl-acetonitrilen, aus welchen durch partielle Verseifung, Hydrierung und Veresterung einerseits der α-Phenyl- α-piperidyl-(3)-essigsäure-methylester und anderseits der α-Phenyl-α-[piperidyl-(2)-5-carbonsäure-äthylester]-essigsäure-äthylester gewonnen wurden.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 35 (1952), S. 2016-2022 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In Erweiterung früherer Arbeiten über spasmolytisch wirksame Substanzen wurden einige cycloaliphatisch substituierte Essigsäuren mit Doppelbindung in verschiedenen Stellungen sowie ihre basischen Ester beschrieben.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Monatsschrift Kinderheilkunde 148 (2000), S. 496-497 
    ISSN: 1433-0474
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
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  • 7
    ISSN: 1432-1440
    Keywords: Coronary angioplasty ; Excercise ; Atrial natriuretic factor ; Pulmonary artery pressure ; Right atrial pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary According to several reports of close correlations between pulmonary artery pressure and ANF plasma levels it would be convenient to replace invasive pressure monitoring by ANF determination. Mean pulmonary artery and right atrial pressures and pulmonary artery as well as peripheral venous ANF plasma concentrations were measured in 24 patients before and after coronary angioplasty (PTCA) continuously at rest and during exercise: At rest, both pressure and ANF-values remained unchanged before and after PTCA. At exercise, there was a decrease of mean pulmonary artery pressure (from 41.3±8.6 to 31.5±7.4 mmHg,p〈0.001), mean right atrial pressure (from 11.9±3.0 to 9.0±2.3 mmHg,p〈 0.001), pulmonary artery (282.5±191.0 to 207.3±157.2 pg/ml,p〈0.05) and peripheral venous (112.7±48.0 to 97.1±53.2 pg/ml, n.s.) ANF concentration after PTCA. We found no correlation between PTCA-induced changes of right arterial pressures and ANF concentrations, while changes of pulmonary artery pressures were significantly correlated to changes of peripheral venous (r=0.79,p〈0.001) as well as pulmonary artery (r=0.59,p〈0.01) ANF concentrations at exercise. In 6 of the 24 patients, however there was an inverse relationship between changes of pulmonary artery pressures and ANF concentrations. — Our data demonstrate a significant correlation between changes of ANF plasma level and pulmonary artery pressure values at exercise after PTCA. In the individual case however invasive pressure monitoring cannot be replaced by determination of ANF plasma levels.
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  • 8
    ISSN: 1432-1440
    Keywords: Myocardial infarction ; Hodgkin's disease ; Radiation therapy ; Chemotherapy ; Splenectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Among a total of 2147 patients admitted to our hospital for acute myocardial infarction between 1978 and 1987, three young patients aged 24, 29, and 39 years had previously been treated for Hodgkin's disease. Staging laparotomy, including splenectomy, had been performed in all three patients. Two patients had both mediastinal irradiation (21 and 27 months before infarction) and chemotherapy. In the first patient, postmortem histologic examination of the coronary arteries revealed fibrotic changes, which were probably induced by radiotherapy. In our second patient, myocardial infarction developed 5 days after vinblastine treatment; early angiography showed thrombotic occlusion of the proximal right coronary artery, which was recanalized using the diagnostic Sones catheter. Subsequent angiography revealed normal coronary arteries. This is, to our knowledge, the first case of documented coronary artery thrombosis after treatment with vinca-alkaloids. In our third patient, neither mediastinal irradiation nor chemotherapy had been performed prior to myocardial infarction. However, a marked increase in platelet counts following splenectomy was observed in this patient. The role of radiotherapy, chemotherapy, and splenectomy with consecutive thrombocytosis as a third possible pathogenic factor for subsequent development of myocardial infarction is discussed.
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