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  • 2000-2004  (5)
  • oxidative dehydrogenation  (2)
  • Chebyshev polynomials  (1)
  • IgD deficiency  (1)
  • Key words Pharmacokinetics  (1)
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  • 2000-2004  (5)
Jahr
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  • 1
    Digitale Medien
    Digitale Medien
    Promoting effect of carbon dioxide on the dehydrogenation and aromatization of ethane over gallium‐loaded catalysts (2000)
    Springer
    Catalysis letters 64 (2000), S. 215-221 
    Details
    ISSN: 1572-879X
    Schlagwort(e): gallium oxide ; titanium oxide ; carbon dioxide ; oxidative dehydrogenation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Ga2O3 and Ga2O3/TiO2 catalysts were found to be effective agents for the dehydrogenation of ethane to ethene in the presence of carbon dioxide at 650 °C. The activity of the Ga2O3 and Ga2O3/TiO2 catalysts in the presence of CO2 was 2–4 times higher than that without CO2. Ethene yields reached ca. 20–25% and selectivity was ca. 70–90% at 650°C in the 17% ethane and 83% CO2 feed at an SV of 9,000 ml/(g‐cat h). The presence of CO2 markedly promoted dehydrogenation of ethane over Ga2O3 and Ga2O3/TiO2 catalysts. Furthermore, the promoting effect of CO2 on the aromatization of ethane and ethene over a Ga2O3+H/ZSM‐5 catalyst was also observed above 650 °C. Aromatics yields were higher than those without CO2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019047306179
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  • 2
    Digitale Medien
    Digitale Medien
    Convex Optimal Designs for Compound Polynomial Extrapolation (2000)
    Springer
    Annals of the Institute of Statistical Mathematics 52 (2000), S. 557-573 
    Details
    ISSN: 1572-9052
    Schlagwort(e): Chebyshev polynomials ; convex combination ; extremal problems for polynomials ; Lagrange interpolation polynomial ; optimal discrimination designs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The extrapolation design problem for polynomial regression model on the design space [−1,1] is considered when the degree of the underlying polynomial model is with uncertainty. We investigate compound optimal extrapolation designs with two specific polynomial models, that is those with degrees |m, 2m}. We prove that to extrapolate at a point z, |z| 〉 1, the optimal convex combination of the two optimal extrapolation designs |ξ m * (z), ξ2m * (z)} for each model separately is a compound optimal extrapolation design to extrapolate at z. The results are applied to find the compound optimal discriminating designs for the two polynomial models with degree |m, 2m}, i.e., discriminating models by estimating the highest coefficient in each model. Finally, the relations between the compound optimal extrapolation design problem and certain nonlinear extremal problems for polynomials are worked out. It is shown that the solution of the compound optimal extrapolation design problem can be obtained by maximizing a (weighted) sum of two squared polynomials with degree m and 2m evaluated at the point z, |z| 〉 1, subject to the restriction that the sup-norm of the sum of squared polynomials is bounded.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004185822838
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  • 3
    Digitale Medien
    Digitale Medien
    Dehydrogenation of isopropylbenzene with vanadium-oxide-loaded activated carbon catalyst in the presence of carbon dioxide (2000)
    Springer
    Catalysis letters 69 (2000), S. 59-64 
    Details
    ISSN: 1572-879X
    Schlagwort(e): dehydrogenation ; oxidative dehydrogenation ; cumene ; α-methylstyrene ; vanadium oxide ; activated carbon ; temperature-programmed reduction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Dehydrogenation of isopropylbenzene to α-methylstyrene was carried out using various supported metal oxide catalysts in the presence of carbon dioxide. An activated carbon-supported vanadium oxide catalyst afforded a high activity in carbon dioxide atmosphere: the α-methylstyrene yield in carbon dioxide atmosphere was two times greater than that in an argon atmosphere at 723 K. In order to investigate the role of carbon dioxide in this reaction, we carried out temperature-programmed reduction (TPR) studies using both fresh and used catalysts. The TPR profiles clearly indicate that carbon dioxide could keep the surface of vanadium oxide at a high oxidation state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019084915149
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  • 4
    Digitale Medien
    Digitale Medien
    Pharmacokinetics and bioequivalence evaluation of three commercial tablet formulations of mefloquine when given in combination with dihydroartemisinin in patients with acute uncomplicated falciparum malaria (2000)
    Springer
    European journal of clinical pharmacology 55 (2000), S. 743-748 
    Details
    ISSN: 1432-1041
    Schlagwort(e): Key words Pharmacokinetics ; Bioequivalence ; Mefloquine ; Uncomplicated falciparum malaria ; Dihydroartemisinin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Abstract Objective: To assess the pharmacokinetics and relative bioavailability/bioequivalence of three commercial tablet formulations of mefloquine, i.e. Lariam (reference formulation), Mephaquin 100 Lactab and Eloquin-250, when given sequentially after dihydroartemisinin in Thai patients with acute uncomplicated falciparum malaria. Methods: Twenty-nine Thai patients with acute uncomplicated falciparum malaria were randomised to receive an initial dose of 300 mg dihydroartemisinin, followed by 1250 mg mefloquine (at 24 h and 30 h after dihydroartemisinin) given as either Lariam (n=10 cases), Mephaquin (n=9 cases) or Eloquin-250 (n=10 cases). Serial blood samples were obtained up to day 42 after treatment with mefloquine. Mefloquine concentrations were determined in whole blood by means of ultraviolet high-performance liquid chromatography. The pharmacokinetic parameters of mefloquine were estimated using non-compartmental and compartmental analysis. Results: The three combination regimens were well tolerated. Patients in all treatment groups had a rapid initial response. However, nine patients (four and five cases in regimen containing Mephaquin 100 Lactab and Eloquin-250, respectively) had reappearance of parasitaemia during the follow-up period. Mefloquine from the three formulations showed significantly different pharmacokinetic and bioavailability metrics. Significantly lower peak plasma concentrations (Cmax) and areas under the plasma concentration–time curve (AUC; AUC0–48h, AUC0–7days, and total AUC) were observed with Mephaquin 100 Lactab than with the other two formulations. Mean values for relative bioavailability of the test to standard products were 49.1% (Mephaquin 100 Lactab) and 72.4% (Eloquine-250). Based on the criteria set, the bioavailability of the two test products (Mephaquin 100 Lactab and Eloquine-250) was considered non-equivalent to the reference product with respect to the rate (tmax, Cmax) and extent (AUC0–48h, AUC0–7days, total AUC) of mefloquine absorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002280050008
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  • 5
    Digitale Medien
    Digitale Medien
    The [HLA-B18, F1C30, DR3] Conserved Extended Haplotype Carries a Susceptibility Gene for IgD Deficiency (2000)
    Springer
    Journal of clinical immunology 20 (2000), S. 216-220 
    Details
    ISSN: 1573-2592
    Schlagwort(e): IgD deficiency ; MHC ; extended haplotype ; Basques
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We showed previously that the conserved extended MHC haplotype [HLA-B8, SC01, DR3] carries recessive susceptibility genes for IgA and IgG4 deficiency and dominant genes for IgD and IgG3 deficiency. [HLA-B18, F1C30, DR3] has similar class II and III regions to [HLA-B8, SC01, DR3] and is common in the Basques. We therefore studied serum immunoglobulin concentrations in Basque homozygotes, heterozygotes, and noncarriers of (F1C30, DRB1*0301, DRB3*02, DQA1*0501, DQB1*0201) (F1C30, DR3). As shown by others, no subjects were deficient in IgA, IgM, or IgG subclasses. In contrast, 29% of homozygotes and three of seven double heterozygotes with (SC01, DRB1*0301, DRB3*0101, DQA1*0501, DQB1*0201) (presumed homozygotes for IgD deficiency susceptibility genes) were IgD deficient. Thus, 32% of presumed homozygotes were IgD deficient compared with 1.6% of noncarriers. Of haplotype heterozygotes, 25% were IgD deficient. The high frequency of IgD deficiency in both homozygotes and heterozygotes for (F1C30, DR3) suggests a partially penetrant dominant susceptibility gene for IgD deficiency on [HLA-B18, F1C30, DR3].
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006693614974
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