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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of optical activity of isotropic compounds in suspension (1993)
    Springer
    Monatshefte für Chemie 124 (1993), S. 217-227 
    Details
    ISSN: 1434-4475
    Keywords: Isotropic solids ; Optical activity ; Sodium bromate ; Sodium chlorate ; Suspension measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde eine verläßliche Methode zur Messung der optischen Aktivität isotroper Verbindungen in Suspensionen unter Verwendung zweier mischbarer Flüssigkeiten als Medium zur Suspension feiner Pulver entwickelt. Die optische Rotation wurde nach einer präzisen Anpassung des Brechungsindex des Suspensionsmediums an den der Festpartikel gemessen. Zur Entwicklung der Methode wurden Natriumchlorat und Natriumbromat als Festkörper eingesetzt. Die Messungen waren in perfekter Übereinstimmung mit Rotationswerten aus entsprechenden großen Kristallen.
    Notes: Summary A reliable method for the measurement of the optical activity of optically active isotropic solid substances in suspension was developed using two miscible liquids as media for suspending the fine solid powders. The optical rotation was measured after precise matching of the refractive index of the suspending media with that of the solid particles. Sodium chlorate and sodium bromate were used as optically active solids for the development of this method. The measurements were in complete agreement with the measurements of the optical rotation of the corresponding large crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808681
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  • 2
    Electronic Resource
    Electronic Resource
    Solid-state, optical-rotation measurements on macromolecules using powder-suspensions (1990)
    Springer
    Monatshefte für Chemie 121 (1990), S. 311-316 
    Details
    ISSN: 1434-4475
    Keywords: Solid state measurement ; Optical rotation ; Powder-suspension ; Sodium chlorate ; RNA ; Synthetic polymers ; Biopolymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über eine Methode zur Messung der optischen Rotation von Festkörpern in Suspensionen berichtet, wobei dissymetrische Kristalle (z. B. Natriumchlorat und -bromat), synthetische Polymere, Polypeptide und Biopolymere behandelt werden. Die Beispiele umfassen Poly(triphenylmethylmethacrylat), Poly-S-lactid, Poly-L-hydroxyprolin, Hemocyanin, Celluloseacetat undRNA. Die Ergebnisse zeigen, daß die optischen Rotationen bezüglich Unterschiede in der Sekundärstruktur empfindlich sind und daß diese Messungen als ein Maß für Strukturunterschiede zwischen Festzustand und Lösung herangezogen werden können.
    Notes: Summary We report techniques for measuring optical rotation of suspended solids, including dissymmetric molecular crystals (e.g. sodium chlorate and bromate), synthetic polymers, polypeptides and biopolymers. Examples include poly(triphenylmethyl methacrylate), poly-S-lactide, poly-L-hydroxyproline, hemocyanine, cellulose acetate andRNA. The results indicate that optical rotation measurements are sensitive to differences in secondary structure and can serve as a probe for structural differences between solid-state and solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808933
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  • 3
    Electronic Resource
    Electronic Resource
    Optical activity measurements in solids 7. Polylactides and poly(β-hydroxybutyrates)This paper is dedicated to Professor Hermann Janeschitz Kriegl on the occasion of his 70th Birthday with our warmest wishes. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 34 (1994), S. 433-442 
    Details
    ISSN: 0959-8103
    Keywords: optical activity ; polylactides ; poly(β-hydroxybutyrates) ; solid state measurements ; circular dichroism ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The optical activities of poly-(R)-lactide, poly-(S)-lactide, poly(β-hydroxybutyrate) and two β-hydroxyvalerate copolymers were measured in solution, as solid powders in suspension, and where possible, as films. Poly-(+)-3-methyl-1-pentene was also reinvestigated. In some cases the specific rotation values of powder samples showed significant differences from the values of the solution measurements. The discrepancies of the data observed seem to reflect the local environment of the polymer chains in supermolecular assemblies and consequently the solid state structure(morphology)of the polymers.The circular dichroism (CD) spectra of the polymers were also measured in solution and in the form of their films. For comparison, the CD spectra of the naturally occurring protein casein and of the synthetic polypeptide poly-(L)-proline were also measured.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210340413
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Optical activity measurements in solids 5. Optical rotation of natural polymersDedicated to Professor Milan Lazár on the occasion of his 65th birthday, with warmest personal wishes. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 25-36 
    Details
    ISSN: 0959-8103
    Keywords: optical activity ; solid-state measurements ; natural polymers ; suspension ; birefringence ; isorefractive media ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The optical activity of ten natural-type polymers [poly(α-aminoacids), polysaccharides, proteins and nucleic acids] was measured in solution, as solid powders in suspension, and where possible in the form of films. In some cases the specific rotation of powder samples showed significant differences to the values obtained from solution measurements. The discrepances seem to reflect the arrangements of polymer chains in supermolecular assemblies in the polymer solid state.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210330104
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    Paper (German National Licenses)
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