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  • Polymer and Materials Science  (2)
  • Ag-NOR pattern  (1)
  • Differential pulse polarography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A population analysis of Robertsonian and Ag-NOR polymorphisms in brown trout (Salmo trutta) (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 105-111 
    Details
    ISSN: 1432-2242
    Keywords: Salmo trutta ; Population analysis Robertsonian polymorphism ; Ag-NOR pattern
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An analysis of Robertsonian polymorphism and variation in the number of active NORs has been carried out in several populations of brown trout (Salmo trutta) from Northwestern Spain. The karyotype of this species appears to be soundly established, and essentially no variation has been found in chromosome number. Interindividual and interpopulation variation in arm number was detected, with figures ranging between 100 and 102 among individuals, and between 100.10 and 100.80 among populations. This variation in arm number is solely attributable to the polymorphism of the short arm of the main NOR-bearing pair 11, which can appear from acrocentric to metacentric in different individuals. Most populations analyzed showed the standard distribution of active NORs previously observed in this species. The Miño drainage basin, and specially the Chamoso population, showed a multi-chromosomal distribution of active NORs, with several new locations, always telomeric. In most cases no concordance was observed between previously detected rDNA sites in S. trutta and the new Ag-NOR locations. This fact suggests a transposition mechanism rather than an activation of silent rDNA sites to explain this multichromosomal NOR pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226990
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical study of iproniazid and its analytical determination by differential pulse polarography (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 491-496 
    Details
    ISSN: 1040-0397
    Keywords: Iproniazid ; Differential pulse polarography ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Iproniazid was found to be irreversibiy reduced in two steps, involving the exchange of two electrons and two protons each, by using tast polarography, normal pulse polarography (NPP), and cyclic voltammetry (CV). The rate constants of these two steps were found to be 5.8 × 10-6 and 4.2 × 10-6 and 4.2 × 10-6 cm s-1, respectively, and their corresponding diffusion coefficients 4.5 × 10-5 and 8.3 × 10-5 cm2 s-1, Also, α, the coefficient of cathodic transfer, was found to be 0.20 to 0.25 for the first peak and 0.17 to 0.15 for the second. On the basis of the electrochemical study performed, a differential pulse polarographic method for the determination of iproniazid over the concentration range of 5 × 10-7 M to 1 × 10-4 M was developed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060522
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of heat treatment on pulsed laser deposited amorphous calcium phosphate coatings (1998)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 43 (1998), S. 69-76 
    Details
    ISSN: 0021-9304
    Keywords: calcium phosphate coatings ; pulsed laser deposition ; heat treatment ; recrystallization ; structural analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300 °C. They were heated in air at different temperatures: 300, 450, 525 and 650 °C. Chemical and structural analyses of these coatings were performed using X-ray diffraction (XRD), FTIR, and SEM. XRD analysis of the as-deposited and heated coatings revealed that their crystallinity improved as heat treatment temperature increased. The main phase was apatitic, with some β-tricalcium phosphate in the coatings heated at 525 and 600 °C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450 °C and almost solely for phosphate at 525 and 600 °C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600 °C. At 450 °C a texture on the coating surface was observable by SEM that was attributable to a calcium hydroxide and calcite formation by XRD. These phases almost disappeared at 600 °C, probably due to a transformation into calcium oxide. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 43: 69-76, 1998
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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