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  • 1
    Electronic Resource
    Electronic Resource
    Contamination of a well in a uniform background flow (1992)
    Springer
    Stochastic environmental research and risk assessment 6 (1992), S. 191-207 
    Details
    ISSN: 1436-3259
    Keywords: Hydrodynamic dispersion ; Fokker-Planck equation ; backward equation ; boundary layer ; complex potential function ; fraction of contaminated particles that enter a well
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract In this paper we describe the transport of pollution in groundwater in the neighbourhood of a well in a uniform background flow. We compute the rate at which contaminated particles reach the well as a function of the place of the source of pollution. The motion of a particle in a dispersive flow is seen as a random walk process. The Fokker-Planck equation for the random motion of a particle is transformed using the complex potential for the advective flow field. The resulting equation is solved asymptotically after a stretching transformation. Finally, the analytical solution is compared with results from Monte Carlo simulations with the random walk model. The method can be extended to arbitrary flow fields. Then by a numerical coordinate transformation the analytical results can still be employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01581450
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Arctic-Antarctic disjunctions in the benthic seaweeds Acrosiphonia arcta (Chlorophyta) and Desmarestia viridis/willii (Phaeophyta) are of recent origin (1993)
    Springer
    Marine biology 115 (1993), S. 381-386 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two examples of the most extreme biogeographic disjunctions in benthic marine algae are found in Acrosiphonia arcta (Chlorophyta) and Desmarestia viridis/willii (Phaeophyta). Both species are members of the Arctic and Antarctic boreal and subboreal marine floras. Although both genera have temperate species, neither genus has subtropical or tropical representative. Comparisons of the fast-evolving ribosomal DNA internal transcribed spacer regions among isolates in each of the two species collected from both hemispheres showed an unexpected near sequence identity suggesting that these biogeographic disjunctions are of recent origin, possibly as recent as the last Pleistocene glacial maximum (18000 yr ago). Paleoclimatic explanations that rely on a much earlier transequatorial passage of cold-adapted species through a narrowed and cooler tropical belt during the Oligocene/Miocene (38 to 7 Ma ago) are unlikely. We hypothesize that despite the separated evolutionary histories of the northern and southern hemisphere coldwater marine floras, deep-water dispersal of microthalli has occurred and probably occurs on a regular basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349835
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of epoetin in haemodialysis patients after subcutaneous administration: influence of chronic treatment (1993)
    Springer
    Pharmacy world & science 15 (1993), S. 252-256 
    Details
    ISSN: 1573-739X
    Keywords: Anemia ; Epoetin ; Hemodialysis ; Injections, subcutaneous ; Pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The purpose of this study was to investigate whether chronic subcutaneous administration of epoetin has an influence on its pharmacokinetics in patients with chronic renal failure and anaemia. 14 Patients were included in the study. The data of 8 patients could be evaluated at the end of the study. All patients were on maintenance haemodialysis. The pharmacokinetic profile of epoetin was studied directly after the first subcutaneous administration of 60 U/kg body weight. Patients were further treated with epoetin to maintain haemoglobin concentration between 6.0 and 6.5 mmol/l. After about one year of treatment the pharmacokinetic profile was studied again, using the same dosage. Between both profiles no significant differences (paired Student's t-test) were found in the pharmacokinetic parameters studied: absorption half-life, time to maximum concentration, maximum concentration, elimination half-life, area under the curve and mean residence time. However, in individual patients large differences may be found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01871126
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    Paper (German National Licenses)
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