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  • Chemistry  (31)
  • Bi garnets  (1)
  • Methodenvergleich, Spurenanalyse  (1)
  • Magnetism
  • 1970-1974  (33)
  • 1965-1969
  • 1973  (13)
  • 1970  (20)
  • 1
    Electronic Resource
    Electronic Resource
    Preparation and optical properties of single crystal thin films of bismuth substituted iron garnets for magneto-optic applications (1973)
    Springer
    Applied physics 2 (1973), S. 219-228 
    Details
    ISSN: 1432-0630
    Keywords: Magneto-optics ; Bi garnets ; Liquid phase epitaxy ; Crystal growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Single crystal thin films of Bi substituted iron garnets have been grown by the liquid phase epitaxy technique. The growth conditions and compositions are presented together with the segregation coefficients of Bi and Pb as a function of growth temperature. The Faraday rotation and optical absorption have been measured for wavelengths between 0.7 and 0.46 μm. The superior magneto-optic properties (Faraday rotations of up to ten times larger than that observed for Y3Fe5O12) make these epitaxial layers attractive for magneto-optic devices. The influence of Pb incorporation on the optical properties of the films is discussed. Compositions of Bi and Ga(Al) substituted Gd3Fe5O12, which exhibit a magnetic compensation temperature near room temperature and high Faraday rotation, have also been prepared. The magnetic switching behaviour as a function of temperature has been determined. It shows that these films are especially suited for thermomagnetic recording using an argon ion laser at a wavelength of 5145 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889503
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  • 2
    Electronic Resource
    Electronic Resource
    Zellphysiologie des Stoffwechsels. Von D. Pette. Bd. 13 der Konstanzer Universitätsreden. Herausgeg. von G. Hess. Konstanzer Universitätsverlag 1970. 50 S., brosch. DM 4,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 196-196 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040613
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  • 3
    Electronic Resource
    Electronic Resource
    Notiz über ein einfaches Verfahren zur Darstellung von 3,4-Bismethylencyclobuten (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3461-3462 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061031
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  • 4
    Electronic Resource
    Electronic Resource
    Vergleich von Methoden zur Bestimmung von Spurenmetallen im Wasserkreislauf (1973)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 267 (1973), S. 267-270 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Metallen in Wasser ; Spektralphotometrie, Atomabsorption,Voltammetrie, Potentiometrie ; Methodenvergleich, Spurenanalyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe verschiedener physikalisch-chemischer Analysenmethoden können Spurenmetalle in Wasser bestimmt werden. Die speziellen Arbeitsbedingungen und die Anwendbarkeit von Atomabsorptions-Spektrometrie, Multiple-Anodic-Stripping-Analyse und ionenspezifischen Elektroden bei der Untersuchung von Oberflächen-, Grund- und Trinkwasserproben werden verglichen. Im Hinblick auf die Durchführung von systematischen Serienuntersuchungen ist eine weitgehende Automatisierung von Probenahme, Probenvorbereitung, Nachweisverfahren und Auswertung anzustreben. Die entsprechenden Untersuchungsergebnisse und die daraus ableitbaren Beurteilungsmöglichkeiten für korrosionschemische und wassertechnologische Fragen werden diskutiert.
    Notes: Abstract A number of physical/ chemical methods of analysis may be used to determine trace elements in water samples. The special conditions of operation and the applicability of atomic absorption spectrometry, multiple anodic stripping analysis, and ion-specific electrodes for the analysis of samples from surface, ground, and drinking water are compared. With a view to systematic serial analysis, an automation as complete as possible, of sampling, preparation of samples, methods of identification and evaluation will be developed. Corresponding analytic results and possibilities of evaluation that may be derived on this basis for problems of corrosion chemistry and water technology are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425299
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  • 5
    Electronic Resource
    Electronic Resource
    Umsetzung von 1,1-Diphenylcyclopropan mit TetracyanäthylenDiese Arbeit wurde vom National Cancer Institute, Public Health Service Research Grant CA-06 535, unterstützt. (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 82 (1970), S. 216-217 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19700820504
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental thermodynamics of the helix-random coil transition. III. Determination of the transition enthalpies of the helical complexes poly(I + C) and poly I in solution (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 923-936 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enthalpies of the helix-coil transitions of the ordered polynucleotide systems of poly(inosinic acid)-poly(cytidylic acid) [poly(I + C)], (helical duplex), and of poly (inosinic acid) [poly(I + I + I)], (proposed secondary structure: a triple-stranded helical complex), were determined by using an adiabatic twin-vessel differential calorimeter. Measuring the temperature course of the heat capacity of the aqueous polymer solutions, the enthalpy values for the dissociation of the helical duplex poly (I + C) and the three-stranded helical complex poly(I + 1 + 1), respectively, were obtained by evaluating the additional heat capacity involved in the conformational change of the polynucleotide system in the transition range. The ΔH values of the helix-coil transition of poly (I + C) resulting from the analysis of the calorimetric measurements vary between the limits 6.5 ± 0.4 kcal/mole (I + C) and 8.4 ± 0.4 kcal/mole (I + C). depending on the variation of the cation concentration ranging from 0.063 mole cations kg H2O to 1.003 mole cations/kg H2O. The calorimetric investigation of an aqueous poly I solution (cation concentration 1.0 mole/kg H2O) yielded the enthalpy value ΔH = 1.9 ± 0.4 kcal/mole (I), a result which has been interpreted qualitatively following current models of inter- and intramolecular forces of biologically significant macromolecules. Additional information on the transition behavior of poly(I+ C)Was obtained by ultraviolet and infrared absorption measurements.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090806
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  • 7
    Electronic Resource
    Electronic Resource
    A calorimetric study of a polymer-monomer complex formed by polyuridylic acid 3′,5′-cyclic AMP (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 373-385 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The existence of a soluble complex formed by polyuridylic acid (poly (U)) and 3′,5′-cyclic AMP (cAMP) is demonstrated by u.v. extinction vs. temperature curves, optical rotation, equilibrium dialysis, and reaction calorimetry. The complex hasthe stoichiometry of 2 poly (U)-cAMP and its formation is accompanied by an enthalpy change of -13.0 kcal/mole of base triplet. The introuction of an empirical factor α in the equations given by Damle2 and Crothers2 leads to the evolution of a ΔH value of -13.4 keal/mole. The parameter α is considered as a correction factor for the concentration dependence of the binding process. There is no relation between α and the reduction of monomer activity due to self-association of monomers. The study of the binding process at several temperatures showed that the cooperativity parameter, σ, is independent of temperature and its value of 6.5 × 10-3 is in good agreement with σ = 5 × 10-3 for the poly (U)·poly(A) system.3
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120214
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  • 8
    Electronic Resource
    Electronic Resource
    Berechnung verfahrenstechnischer Übertragungsprozesse mit dem AnalogrechnerVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 30. September bis 2. Oktober 1969 in Bayreuth. (1970)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 42 (1970), S. 509-515 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden zwei Analogrechenschaltungstypen abgeleitet, die aufgrund der Ähnlichkeit von Stoff- und Enthalpiebilanzen zur Berechnung verschiedener Wärme- und Stoffübertragungsprozesse bzw. kombinierter Wärme- und Stoffübertragungsvorgänge verwendet werden können. Bei konstanten Stoffwerten und Übergangszahlen sind darin lediglich die Gleichgewichtsbeziehungen vom jeweiligen Prozeß abhängig. Die Einsatzmöglichkeiten dieser Rechenschaltungen werden an zwei Beispielen (Rektifikation, Verdunstung) erläutert.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330420717
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  • 9
    Electronic Resource
    Electronic Resource
    Recherches dans la série des cyclitols XXXIX RMN. de protons d'hydroxyles de cyclopentane- et de cyclopentène-polyols (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1511-1525 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several mono-, di-, and tri-hydroxy derivatives of cyclopentane and cyclopentene have been studied by NMR. spectroscopy. The chemical shifts and the coupling constants of the OH groups have been correlated with their position, with their configuration and, in some cases, with their conformation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530637
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  • 10
    Electronic Resource
    Electronic Resource
    Synthese von Haschisch-Inhaltsstoffen. 6. Mitteilung5. Mitt. s. [1]. (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 519-524 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of a new (-)-Δ8-6a,10a-trans-tetrahydrocannabinol analogue, containing a N-methyl-3-propyl-pyrrolidin-3-yl side-chain, is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560149
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