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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of low temperature physics 105 (1996), S. 903-908 
    ISSN: 1573-7357
    Schlagwort(e): 74.25.Bt ; 74.72.Fq
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have measured the magnetic field dependence of the electronic specific heat γel (=Cel/T) of polycrystalline Tl2Ba2CuO6+δ from 8 K to above Tc, for samples with Tc = 24 K to 72 K using a high resolution, differential technique. We find that in applied fields of up to 13 T the position of the specific heat jump does not shift significantly for any Tc. This is in strong disagreement with HC2(T) inferred from magnetoresistance experiments on the same compound, where the resistive transition is shifted down considerably by similar fields. However, there is a dramatic collapse of the specific heat anomaly height in field — signifying a loss in entropy around Tc — compensated by a corresponding increase in γel at lower temperatures. The superconducting anomaly is almost completely suppressed in 13 T for the lowest Tc sample, compared to a reduction of 65 % for the sample with Tc = 72 K. We find simple vertical scaling of γel(T) — γn suggesting that the field forces a proportion of the superconductor into the normal state, while the remainder in the superconducting state is unaffected.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 3 (1989), S. 180-182 
    ISSN: 0269-3879
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A simple, accurate and precise procedure for the quantitation of itazigrel (a potent lipophilic inhibitor of collagen and arachidonic acid-induced aggregation being studied for its effects on peripheral vascular disease) from granulated rodent diet is presented. The drug was extracted from rodent diet using methanol + water (80:20) following dissolution of the diet in water. Samples of the supernatant were injected into the HPLC and the eluent was monitored with a fluorescent detector (λex = 320 and λem = 430) to achieve analytical specificity. Interday coefficients of variation of the calibration curve slope were ±6% on standards between 0 and 1000 μg/g. Potency and homogeneity of the drug spiked diet prepared over a 1 year interval at 70,200 and 600 μg/g was 99.3 ± 2.5%, 100 ± 1.8%, and 101 ± 1.9% of label, respectively. Samples prepared for chromatography were stable for 24 h at 20°C, and drug in diet was stable for 102 days when protected from light and stored at 20°C.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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