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  • Articles: DFG German National Licenses  (2)
  • 1995-1999  (2)
  • 1930-1934
  • Meloxicam; haemo- dialysis  (1)
  • Nitella  (1)
  • 1
    ISSN: 1432-1041
    Keywords: Key words End-stage renal failure ; Meloxicam; haemo- dialysis ; pharmacokinetic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: The pharmacokinetics of meloxicam have been studied following administration of a single 15-mg capsule to 12 patients with end-stage renal failure. Pharmacokinetic parameters were determined after haemodialysis. The pharmacokinetic profile obtained in these patients is compared to data obtained from age- and gender-matched healthy volunteers. Results: Total plasma meloxicam concentrations were lower in patients with end-stage renal failure (AUC0–∞12.6 μg ⋅ h ⋅ ml−1) in comparison with healthy volunteers (AUC0–∞39.3 μg ⋅ h ⋅ ml−1). This was reflected by an increase in total clearance (+211%). However, there was an enhanced free meloxicam fraction (unbound drug) in the end-stage renal failure patients (0.9% vs. 0.3% in healthy volunteers). This was observed in association with raised free Cmax (5.0 vs. 2.6 ng/ml) but similar free AUC0–∞(0.13 vs. 0.11 μg ⋅ h ⋅ ml−1) in both groups. Therefore, the raised free fraction is compensated for by the increased total clearance such that no accumulation of meloxicam occurs. Meloxicam plasma concentrations were similar before and after haemo- dialysis. Conclusion: Meloxicam has displayed a pharmacokinetic profile in end-stage renal failure which is similar to that observed for other highly protein bound non-steroidal anti-inflammatory drugs (NSAIDs). However, in view of the higher free Cmax value, and despite no evidence of accumulation, it may be prudent to treat this group of patients with a 7.5-mg dose of meloxicam. This is the lower dose normally recommended for adults. Meloxicam is not dialysable.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: boundary control ; Photogenesis control ; Nitella ; charophyte ; light regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two series of lakes with increasing attenuation were examined for trends in spectral composition. They became the basis for an evaluation of the light environment at the lower boundary (LB) of Nitella meadows in three other series of lakes. Increased attenuation (K d PAR) was marked by progressive erosion of the ‘blue window’ and caused primarily by humic substances. An increase in K d PAR from 0.06 to 0.81 produced, at the floor of the euphotic zone, a shift in K d min from 440 to 580 nm. Regressions of boundary depths of Nitella meadows on water clarity produced similar slope coefficients for the three series of lakes. Several trends became evident: 1, PAR irradiance at the LB increases with depth of the LB; 2, red light (E d 660) declines from richness at shallow LB to near extinction in deep water LB in clear lakes; while 3, blue light (K d 450) increases to an asymptote. Blue light appears to substitute, although less effectively, for red light irradiance in the growth regulation of charophytes. These data support an hypothesis that spectral quality is involved in the determination of lower boundary depths for benthic macro-algae.
    Type of Medium: Electronic Resource
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