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  • 1990-1994  (10)
  • 1925-1929
  • 1990  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Oxazolophanes as masked cyclopeptide alkaloid equivalents: cyclic peptide chemistry without peptide couplings (1990)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 112 (1990), S. 7032-7041 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00175a039
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Examination of urine metabolites in the newborn period and during protein loading tests at 6 months of age—part 1 (1990)
    Springer
    European journal of pediatrics 149 (1990), S. 17-24 
    Details
    ISSN: 1432-1076
    Keywords: Phenylketonuria ; Phenylpyruvic acid ; Phenyllactic acid ; Protein loading test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the course of the collaborative study of children treated for PKU, urine samples from a total of 165 patients were analysed at six different times: in the newborn period before onset of therapy, after beginning of dietary management, during and immediately after a protein loading test at 6 months of age. In 95.9% of newborns with elevated Phe levels in plasma, metabolites of this amino acid as well as of Tyr could be detected. Of all metabolites phenylpyruvate always showed the highest concentration, followed by phenyllactate and o-hydroxy-phenylacetate. During the protein loading test an increase of the same metabolites occured. At the age of 6 months the percentage of p-hydroxylated compounds related to the sum of all metabolites was lower than in the newborn period. Comparing the results of urine analyses at 6 months of age after the protein loading tests with the classification of HPA into the reaction types I–III, it can be clearly stated that patients with the milder forms II and III have already lower levels of Phe metabolites in urine before onset of therapy compared to the reaction type I. In retrospect 52% of the newborns could therefore be classified as reaction type I even before beginning of dietary management. The analysis of urinary Phe metabolites before the onset of therapy therefore provides sufficient information about the reaction type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02126294
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of phase transformations in thermal processing of phosphate rock (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 1699-1705 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde der Reaktionsmechanismus des hydrothermischen Sinterverfahrens von Hydroxyfluorapatit (HFA) untersucht. Proben aus einem Industriedrehofen und aus dem Labor wurden mittels Thermo-, röntgenographischer und chemischer Analyse untersucht. Es wurde gefunden, da\ HFA durch eine Feststoffreaktion mit Ca-Mg-Phosphaten und mittels einer Wechselwirkung mit geschmolzener Schlacke zerfÄllt. Die Zersetzung von Apatit wird von keiner Abdampfung von Fluor begleitet; es schafft lediglich die Hauptvoraussetzung für die Freisetzung von Fluor aus Schlacke.
    Notes: Abstract The reaction mechanism of the hydrothermal sintering processing of hydroxyfluorapatite (HFA) was studied. Samples from an industrial rotary kiln and laboratory-made samples were investigated by thermal, X-ray and chemical analysis. It was found that HFA decomposes by a solid-solid reaction with Ca-Mg-phosphates and by interaction with fused clinker. Apatite decomposition is not accompanied by fluorine evaporation; it merely creates the main precondition for fluorine evolution from clinker.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913416
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal study of decomposition of Cu1/2Mg1/2(H2PO4)2.0.5 H2O (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 677-684 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung CuMgP4O12 ist ein Industrieprodukt, das zu vielen praktischen Zwecken verwendet wird. Seine Herstellung aus Cu0.5Mg0.5(H2PO4)2.0.5H2O durch Kalzinieren wurde mittels Thermoanalyse und Extraktionsverfahren unter verschiedenen experimentellen Bedingungen untersucht, insbesondere bezogen auf den die Probe umgebenden partiellen Wasserdampfdruck. Zwischenprodukte und Endprodukte wurden identifiziert und die optimalen Bedingungen für die Bildung von c-CuMgP4O12 gegeben.
    Notes: Abstract c-CuMgP4O12 is an industrial product used for various practical purposes. Its preparaton from Cu1/2Mg1/2(H2PO4)2.0.5H2O by calcination was studied by means of thermal analysis and extraction methods under different experimental conditions, in particular at different partial pressures of water vapour with the sample in contact. The intermediates and end-products were identified and the optimal conditions for the formation ofc-CuMgP4O12 are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914519
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  • 5
    Electronic Resource
    Electronic Resource
    Role of the DTG curve in the evaluation of TG curve by computer in case of overlapping reactions (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 2313-2322 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Auf computergestützte Art weisen die Autoren an einander überlagernden Reaktionen die Berechtigung der Anwendung der DTG-Kurven zur Erstellung von TG-Kurven nach.
    Notes: Abstract The authors justified in a computer controlled way the application of the DTG curve to the evaluation of TG curves of overlapping reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913628
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanism of the thermal dehydration of Co1/2Ca1/2(H2PO4)2.2H2O (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 929-938 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels Thermoanalyse bei nichtisothermen (dynamischen) und bei quasi-isotherman-isobaren Bedingungen wurde der Mechanismus der Dehydratations- und der Kondensationsreaction bei der Kalzinierung von Co1/2Ca1/2(H2PO4)2.2H2O untersucht. Die isotherme Kalzinierung des binären Dihydrogenphosphates als Ausgangsstoff wurde in einem Elektroofen bei verschiedenen Temperaturen durchgefürt. Zwischen- und Endprodukte der Reaktion wurden durch instrumentelle analytische Methoden und durch Extraktionsexperimente mit Lösungen von anorganischen Verbindungen und mit organischen Reagenzien analysiert. Es wurde weiterhin der Einfluß des Wasserdampfdruckes auf Weg, Geschwindigkeit und Ausbeute der Kondensationsreaktionen und auf die Bildung des Hauptproduktes (binäres Cyclotetraphosphat (Tetramethaphosphat)c-CoCaP4O12) untersucht.
    Notes: Abstract The mechanism of the dehydration and condensation reaction taking place during calcination of Co1/2Ca1/2(H2PO4)2.2H2O has been followed by means of thermal analyses at non-isothermal (dynamic) and at quasi-isothermal-isobaric conditions. Isothermal calcination of starting binary dihydrogenphosphate was carried out in electric oven at various temperatures. The reaction intermediates and products obtained were analyzed by instrumental analytical methods and extraction experiments with solutions of inorganic compounds and with organic reagents. Effect of water vapour pressure has been followed on course, rate and yield of the condensation reactions and of the formation of main considered product-binary cyclo-tetraphosphate (tetrametaphosphate)c-CoCaP4O12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904629
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  • 7
    Electronic Resource
    Electronic Resource
    Study of the thermal dehydration of Mn1/2Ca1/2(H2PO4)2.2H2O (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 881-889 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Dehydratations- und Kondensationsreaktion während der Kalzinierung von Mn1/2Ca1/2(H2PO4)2.2H2O wurden unter quasi-isothermen-isobaren Bedingungen mittels Thermoanalyse untersucht. Die isotherme Kalzinierung der binären Dihydrogenphosphat-Ausgangssubstanz wurde bei verschiedenen Temperaturen auch in einem Elektroofen durchgefährt. Erhaltene Reaktionsprodukte wurden mittels Chromatographie, IR-Spektroskopie, Röntgendiffraktionsanalyse und Elektronenmikroskopie untersucht. Die Zusammensetzung der Kalzinierungsprodukte wurde über Auslaugen bestimmt. Weiterhin wurde der Einfluß des partiellen Druckes von Wasser auf den Verlauf der Kondensationsreaktionen und die Bildung des Hauptproduktes {binäres Cyclotetraphosphat (Tetramethaphosphat) MnCaP4O12} untersucht.
    Notes: Abstract The dehydration and condensation reactions taking place during the calcination of Mn1/2Ca1/2(H2PO4)2.2H2O has been followed by means of thermal analyses under quasi-isothermal-isobaric conditions. Isothermal calcination of starting binary dihydrogenphosphate has been also carried out in an electric oven at various temperatures. The reaction products obtained were analyzed by chromatography, IR-spectroscopy, X-ray diffraction analysis, and electron microscopy. The compositions of the calcinates were determined through extraction. The effect of the partial pressure of water vapour has been followed on course, of the condensation reactions and of the formation of the main product: binary cyclotetraphosphate (tetrametaphosphate) MnCaP4O12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904624
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  • 8
    Electronic Resource
    Electronic Resource
    The Derivatograph-PC a new type of personal computer-controlled derivatograph (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 2693-2699 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Derivatograph-PC ist ein Gerät für die Durchführung von simultanen TG, DTG, DTA, TD and EGA Untersuchungen unter Anwendung von nicht-isothermen, isothermen und quasi-isothermen Aufheizungsmethoden. Dieses Gerät ist der neueste Typ in der Serie der Derivatographen. Die Einrichtung funktioniert mit Hilfe von einem “IBM compatible personal Computer”.
    Notes: Abstract The Derivatograph-PC is an instrument for simultaneous TG, DTG, DTA, TD and EGA investigations, using non-isothermal, isothermal and quasi-isothermal heating techniques. This is the latest type in the series of derivatographs. It is operated by means of an IBM-compatible personal computer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913663
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  • 9
    Electronic Resource
    Electronic Resource
    Mass spectrometric analysis of rabbit and bovine trypsin-solubilized cytochrome b5 (1990)
    Springer
    The protein journal 9 (1990), S. 695-703 
    Details
    ISSN: 1573-4943
    Keywords: Cytochrome b5 ; molecular weight determination ; amino acid sequence ; tandem mass spectrometry ; mass spectrometry of peptides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The sequence and blocking group of the amino-terminal 15 amino acids of rabbit trypsin-solubilized cytochrome b5 were determined by liquid secondary ion mass spectrometry (LSIMS) and tandem mass spectrometry (MS/MS). The molecular weights of peptides generated from aStaphylococcus aureus V8 protease digest of this protein were determined by LSIMS analysis and the two peptides containing the blocked amino-terminus were sequenced by tandem mass spectrometry to yield the sequence; N-acetyl-Ala-Ala-Glu-Ser-Asp-Lys-Asp-Val-Lys-Tyr-Tyr-Thr-Leu-Glu-Glu. Comparison of this sequence with a recently reported cDNA sequence (Dariushet al., 1988) indicates that Gln at position 3 is selectively deamidated, although no other discrepancies were found. Intact rabbit and bovine trypsin-solubilized cytochrome b5 were also analyzed by LSIMS on a high-field mass spectrometer equipped with a diode array detector. Mass measurement of the unresolved protonated molecular ion peak tops gave average molecular weights of 9462.2±2 and 9502.3±2 for bovine and rabbit trypsin-solubilized cytochrome b5, respectively. In both cases, these molecular weights correspond to a cytochrome b5 fragment consisting of amino acids Asp(7)-Arg(88). The average molecular weight for the rabbit amino-terminal-blocked form of trypsin-solubilized cytochrome b5 was found to be 10,144.5±2, which was consistent with the molecular weight predicted for the extended N-acetylated form (residues 1–88) of Mr 10,146.1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024764
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous TG, DTG, DTA and EGA examination of argillaceous rock. Part II (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 67-83 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels der in Teil I beschriebenen Methoden wurden fünf Silurschiefer untersucht und deren Sulfat-, Sulfid-, Karbonat-, Illit- und Chloritgehalt halbquantitativ ermittelt.
    Notes: Abstract With the new technique described in Part I of this paper, the authors investigated five Silurian shale samples and semiquantitatively determined their sulphate, sulphide, carbonate, illite and chlorite contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912069
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