Search for dissertations about: "Diffusion chambers"

Showing result 1 - 5 of 7 swedish dissertations containing the words Diffusion chambers.

  2. 1. The Sink-Effect in Indoor Materials : Mathematical Modelling and Experimental Studies

    Author : Peter Hansson; KTH; []
    Keywords : sink-effect; sorption; adsorption; diffusion; indoor air quality; volatile organic compounds; VOC; contaminants; building materials;

    Abstract : In this thesis the sink-effect in indoor materials wasstudied using mathematical modelling and experimental studies.The sink-effect is a concept which is commonly used tocharacterise the ability of different indoor materials to sorbcontaminants present in the indoor air. The sorption process ismore or less reversible, i.e. READ MORE

  4. 2. Models for the Transfer of Drugs from the Nasal Cavity to the Central Nervous System

    Author : Björn Jansson; Erik Björk; Sveinbjörn Gizurarson; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Biopharmacy; Administration; intranasal; Nasal mucosa; Central nervous system; Olfactory bulb; Rat; Mouse; Swine; Cattle; Diffusion chambers; culture; In vitro; Biological models; Biological transport; Dextrans; Dopamine; Gels; Polysaccharides; Autoradiography; Fluorescence microscopy; Biofarmaci; Biopharmacy; Biofarmaci;

    Abstract : The blood-brain barrier restricts the access of many compounds, including therapeutic agents, to the brain. Several human studies indicate that nasal administration of hydrophilic compounds, such as peptides, can bypass the blood-brain barrier. The aims of this thesis were to develop and refine models for this direct nose-to-brain transfer. READ MORE

  5. 3. Intestinal barrier function in health and disease

    Author : Pernilla Nejdfors; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; VIP.; PACAP; secretion; ion transport; urine reservoir; radiation therapy; ulcerative colitis; macromolecules; dextran; mannitol; Ussing chamber; Intestinal permeability; mucosa; Animal physiology; Djurfysiologi; Physiology; Fysiologi;

    Abstract : The intestinal epithelium has the dual function of absorbing nutrients and water as well as being a barrier to potentially harmful substances such as macromolecules and bacteria. In the present thesis the barrier function of the intestinal mucosa was studied in vitro in Ussing diffusion chambers. READ MORE

  6. 4. Transformation and Release of Potassium, Chlorine, and Sulfur from Biomass under Conditions Relevant to Dual Fluidized Bed Gasification

    Author : Placid Tchoffor Atongka; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cl; release of K; Char gasification; and S;

    Abstract : The transformation and release of ash-forming elements during thermal conversion of biomass areconducive to ash-related problems, for example, agglomeration of bed material in fluidized beds. Theoccurrence and severity of these problems largely depend on the extent to which K, Cl, and S arereleased from biomass during thermal conversion processes. READ MORE

  7. 5. Metabolic communication between individual yeast cells

    Author : Martin Mojica Benavides; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Metabolic synchronization; Single-cell; glycolytic oscillations; synchronization waves;

    Abstract : With the recent progress in sensitive cell manipulation and microfabrication techniques, glycolytic oscillations in yeast have been observed at a single-cell level. It was shown that individually, oscillating cells could entrain their phases by periodic external perturbations. READ MORE