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  • 2000-2004  (1)
  • 1965-1969  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Forensic evaluation of mtDNA in a population from south west Switzerland (2000)
    Springer
    International journal of legal medicine 113 (2000), S. 89-97 
    Details
    ISSN: 1437-1596
    Keywords: Key words Mitochondrial DNA ; Control region ; PCR ; Sequencing ; Population study ; Forensic ¶casework
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Notes: Abstract The polymorphism of the two hypervariable segments (HVI and HVII) of the control region of mtDNA was analyzed in a population of 154 unrelated individuals from south west Switzerland using a fluorescent based capillary electrophoresis sequencing method. In our population data of 154 random individuals, ¶137 mtDNA types were observed. Of these, 124 sequences were observed only in one individual whereas 10 sequences were observed in 2 individuals, 2 sequences in 3 individuals and 1 sequence in 4 individuals. The probability of two unrelated individuals having the same sequence was 0.84%. The results were compared with four other Caucasian populations. Furthermore, the usefulness of the mtDNA sequencing was tested, for exclusion and inclusion, in 18 forensic cases including 69 evidence samples and 44 reference samples. Despite the fact that 55% of the evidence samples yielded a negative result for the nuclear DNA with the human dot quantitation system, the success rate of the mtDNA sequencing was 71.0%. This validation study proves the great usefulness and sensitivity of the mtDNA sequencing technique using nested PCR and fluorescent capillary electrophoresis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00007715
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  • 2
    Electronic Resource
    Electronic Resource
    Comparaison des techniques de fractionnement des polyoxyéthylèneglycols par chromatographie en phase gazeuse, liquide et en couche mince (1968)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 236 (1968), S. 228-240 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Les polyoxyéthylèneglycols de masses moléculaires faibles (¯Mw⩽600) ont des répartitions moléculaires étroites qui rendent leur fractionnement difficile. Certaines techniques chromatographiques permettent cependant une bonne séparation des chaînes macromoléculaires et en conséquence, la détermination quantitative de leur répartition. C'est ainsi que les auteurs ont utilisé avec succès les techniques suivantes: Chromatographie en phase gazeuse. Elle donne une très bonne séparation, mais reste limitée aux masses moléculaires faibles (¯Mw⩽400) du fait de la dégradation des chaînes macromoléculaires de poids moléculaire plus élevé lorsqu'on augmente la température d'injection. Chromatographie en phase liquide. Elle fournit une bonne séparation et permet de faire facilement des mesures quantitatives. Cette technique a par ailleurs l'avantage de pouvoir être utilisée en fractionnement préparatif. Chromatographie en couche mince. Elle donne une bonne séparation même pour les masses moléculaires plus élevées, mais les résultats quantitatifs sont moins précis. Les auteurs comparent les conditions particulières dans lesquelles les fractionnements sont obtenus et les résultats fournis par ces diverses méthodes chromatographiques. Ils discutent leurs avantages et inconvénients respectifs ainsi que leurs limites.
    Notes: Summary Polyethylene glycols of small molecular weight (¯Mw⩽600) have narrow molecular distributions which make their fractionation difficult. However, some chromatographic techniques allow a good separation of the macromolecular chains and from that the quantitative determination of their distribution is possible. The following techniques have been successfully employed: Gas chromatography gives a very good separation but remains limited to small molecular weights (¯Mw⩽400) because of the degradation of the macromolecular chains of higher molecular weight when the temperature of injection is increased. Liquid chromatography yields a good separation and permits to do easily quantitative measurements. Moreover, this technique has the advantage of being used for preparative fractionation. Thin-layer chromatography gives a good separation even for the higher molecular weights but the quantitative results are less accurate. The various conditions on which the fractionations are obtained and the results given by these three chromatographic methods are compared. Their respective advantages and drawbacks as well as their limits are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503277
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  • 3
    Electronic Resource
    Electronic Resource
    Comparaison des méthodes de fractionnement par chromatographie de perméation et par gradient d'elution pour la détermination des répartitions moléculaires des polypropylénes (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 205-213 
    Details
    ISSN: 0021-8995
    Keywords: 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: Molecular weight distributions for polypropylene samples have been determined by a permeation fractionation method (GPC). Porous silica beads were used as a packing material for the columns. The set of columns allows a good separation of the polypropylene macromolecular chains in a range of molecular weights from 5000 to 1.5 × 106, and the thermal and mechanical stabilities of these beads are very good. The calibration has been carried out with fractions of polypropylene of narrow molecular weight distribution prepared by a large-scale column fractionation. The molecular weights M̄w and M̄n and the ratios M̄w/M̄n calculated from the GPC curves show, in general, good agreement with the ones calculated from the column fractionation curves. However, the M̄w/M̄n ratios are always highter in the case of GPC fractionation. This could be due to diffusion phenomena.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130119
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of poly(n-butyl methacrylate) near its glass transition temperature. (J. Polymer sci., A3, 1785-1792, 1965) (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 4000-4000 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100031135
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of poly(n-butyl methacrylate) near its glass transition temperature (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 1785-1792 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The storage and loss shear compliances (J′, J″) of poly(n-butyl methacrylate) (number-average molecular weight 320,000) were measured at frequencies between 0.08 and 1.0 cycle/sec. in the temperature range of 18-33°C., encompassing the glass transition. Data were obtained both at voluminal equilibrium and as a function of time during the slow isothermal contraction which follows a quench to a temperature near the transition. The latter data were supplemented by dilatometric measurements on similar samples to determine the magnitude of the volume contraction. Correlation of the dependences of J′ and J″ on temperature and on elapsed time (at constant frequency) indicated that the relaxation mechanisms are controlled primarily by free volume. The method of reduced variables was successfully applied to the dependence of J′ on temperature and elapsed time using shift factors aT,t calculated from the modified Doolittle equation and the magnitudes of volume contraction measured dilatometrically. The dependence of J″ on both temperature and elapsed time was more complicated, indicating a change in the shape of the retardation spectrum with free volume. The behavior is qualitatively very similar to that of poly(vinyl acetate), previously studied, except that the magnitudes of J′ are considerably larger and the thermal expansion coefficient of the free volume is smaller.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030510
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