Sökning: "Semipermeable membrane devices"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Semipermeable membrane devices.

  1. 1. Semipermeable membrane devices in monitoring of organic pollutants in the aquatic environment

    Författare :Darius Sabaliunas; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; effect studies; environmental monitoring; organic pollutants; bioconcentration; passive samplers; Semipermeable membrane devices; SPMDs; toxicity; genotoxicity; bioassays; Ecology; Ekologi;

    Sammanfattning : Semipermeable membrane devices (SPMDs) are passive samplers capable of concentrating hydrophobic chemicals from water, sediments, soil and air. They consist of layflat polymeric membrane such as polyethylene containing a thin film of synthetic lipid such as triolein. LÄS MER

  3. 2. Semipermeable membrane devices as integrative tools for monitoring nonpolar aromatic compounds in air

    Författare :Hanna Söderström; Mats Tysklind; Per-Anders Bergqvist; Jochen F. Muller; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Environmental chemistry; air pollution; alkyl-PAHs; atmosphere; bioavailability; boundary layer; diffusive sampling; emissions; integrative; membrane; monitoring; nitro-PAHs; PAHs; particles; passive samplers; PCBs; plants; PRCs; release rate; sampler design; sources; SPMDs; traffic; uptake rate; wind effect; wood burning; Miljökemi; Environmental chemistry; Miljökemi;

    Sammanfattning : Air pollutants pose a high risk for humans, and the environment, and this pollution is one of the major environmental problems facing modern society. Active air sampling is the technique that has been traditionally used to monitor nonpolar aromatic air pollutants. LÄS MER

  4. 3. Cell transplantation and immunoisolation : studies on a macroencapsulation device

    Författare :Ehab Rafael; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Encapsulation of cellular grafts in semipermeable membranes may provide a way to protect the graft from immune attack without the need for pharmacological immunosuppression. In this thesis, the use of immunoisolating devices consisting of a bilaminar PTFE membrane was evaluated. LÄS MER

  5. 4. Advanced Methods for Evaluation of the Performance of Complex Drug Delivery System

    Författare :Caroline Alvebratt; Christel Anna Sofia Bergström; Maria Strömme; Caitriona O'Driscoll; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; amorphous solid dispersion; coadministration; digestion; dissolution; drug absorption; enabling formulation; in vitro assay; lipid-based formulation; mesoporous carrier; supersaturation; Farmaceutisk vetenskap; Pharmaceutical Science;

    Sammanfattning : Low oral bioavailability of drugs originating from poor aqueous solubility is a common issue in drug development. Various enabling formulations have been presented to circumvent this limitation, many making use of supersaturation. In these, the drug is delivered to the gastro-intestinal lumen in a high energy state e.g. LÄS MER

  7. 5. Safety and biological aspects of present techniques of haemodialysis

    Författare :Per Jonsson; Hans Dietrich Polaschegg; Umeå universitet; []
    Nyckelord :haemodialysis; safety; leakage current; central dialysis catheter; microbubbles; microemboli; air contamination; transfusion medicine; transfusionsmedicin;

    Sammanfattning : Introduction: Haemodialysis (HD) is a treatment in which blood from the patient is lead through a tubing system into a dialysis device in a extracorporeal circuit. This circuit contains semipermeable membranes (dialyzer). Blood with uraemic toxins flows on one side, and a salt solution flows on the other side. LÄS MER