Search for dissertations about: "chitin"

Showing result 1 - 5 of 29 swedish dissertations containing the word chitin.

  1. 1. Bacterial Degradation and Use of Chitin in Aquatic Habitats

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Sara Beier; Stefan Bertilsson; Ian Head; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chitin; organic matter degradation; microbial ecology; functional guild; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Abstract : Chitin belongs to the most abundant biopolymers on earth where it has an important role as a structural element in crustaceans, insects, fungi and some phytoplankton. Missing evidence for long-term accumulation of chitin in nature implies fast turnover and as chitin is composed of aminosugar subunits it holds central roles in both carbon and nitrogen cycles. READ MORE

  2. 2. Genetic and molecular regulation of epithelial tube morphogenesis

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Anna Tonning; Göteborgs universitet.; Gothenburg University.; [2006]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; epithelial tube morphogenesis; trachea; Drosophila; chitin; chitin synthase; apical extracellular matrix; paracellular diffusion barrier; tube expansion; septate junctions;

    Abstract : Networks of epithelial tubes, such as the vertebrate lung, kidney and vascular system, enable transport of gases and nutrients to all tissues in the body. These tubes are built up by a single layer of polarized epithelial cells, with the apical membrane facing the lumen. READ MORE

  3. 3. Processing and properties of nanocomposites based on polylactic acid, chitin and cellulose

    University dissertation from Luleå : Luleå University of Technology

    Author : Natalia Herrera Vargas; Kristiina Oksman; Aji P. Mathew; Jyrki Vuorinen; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanocomposite; Cellulose; Chitin; Extrusion; Polylactic acid; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : The production of bio-based and biodegradable nanocomposites has gained attention during recent years for environmental reasons; however, the large-scale production of these nanocomposites still poses challenges. The objective of this work has been to prepare bio-based and biodegradable nanocomposites via liquid-assisted extrusion and to gain a deeper understanding of the process and the relationship between the process, composition, structure and properties. READ MORE

  4. 4. Molecular regulation of epithelial tube size

    University dissertation from Luleå : Luleå University of Technology

    Author : Erika Tång Hallbäck; Göteborgs universitet.; Gothenburg University.; [2009]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Drosophila; tube shape; trachea; chitin; luminal matrix; epithelial tubes; morphogenesis; chloride channel; subapical actin;

    Abstract : In nature, epithelial tubes are vital structures in organ design and are required for transport of gases and liquids in organs, such as the vascular system, the vertebrate lung and the kidneys. The tubular epithelium is single layered, but is often reinforced by layers of muscular support. READ MORE

  5. 5. Superabsorbent Polymers from the Cell Wall of Zygomycetes Fungi

    University dissertation from Luleå : Luleå University of Technology

    Author : Akram Zamani Forooshani; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; chitin; chitosan; cell wall; zygomycetes fungi; polyphosphates; dilute sulfuric acid;

    Abstract : The present thesis presents new renewable, antimicrobial and biodegradablesuperabsorbent polymers (SAPs), produced from the cell wall of zygomycetes fungi. The cellwall was characterized and chitosan, being one of the most important ingredients, was extracted,purified, and converted to SAP for use in disposable personal care products designed forabsorption of different body fluids. READ MORE