Sökning: "PilA"

Hittade 5 avhandlingar innehållade ordet PilA.

  1. 1. The role of the Type IV pili system in the virulence of Francisella tularensis

    Författare :Emelie Salomonsson; Åke Forsberg; Jean-Pierre Gorvel; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Francisella tularensis; tularemia; bacterial pathogenesis; Type IV pili; Type II secretion; Neisseria gonorrhoeae; PilA; RD18; RD19; Molecular biology; Molekylärbiologi;

    Sammanfattning : Francisella tularensis is a Gram-negative intracellular pathogen causing the zoonotic disease tularemia. F. tularensis can be found almost all over the world and has been recovered from several animal species, even though the natural reservoir of the bacterium and parts of its life cycle are still unknown. LÄS MER

  3. 2. Counting solutions to Diophantine equations

    Författare :Oscar Marmon; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Integral points; rational points; counting function; exponential sums; Weyl differencing; van der Corput s method; determinant method; sum of k-th powers; counting function;

    Sammanfattning : This thesis presents various results concerning the density of rational and integral points on algebraic varieties. These results are proven with methods from analytic number theory as well as algebraic geometry. LÄS MER

  4. 3. Identification of new virulence factors in Francisella tularensis

    Författare :Anna-Lena Forslund; Åke Forsberg; Elisabeth Carniel; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Francisella tularensis; regulation; virulence; Hfq; DsbA; type IV pili; membrane; Molecular biology; Molekylärbiologi; molekylärbiologi; Molecular Biology;

    Sammanfattning : Francisella tularensis, the causative agent of tularemia, is a highly virulent bacterium with an infection dose of less than ten bacteria. The ability of a pathogen to cause infection relies on different virulence mechanisms, but in Francisella tularensis relatively few virulence factors are known. Two F. LÄS MER

  5. 4. Microbial Fuel cells, applications and biofilm characterization

    Författare :Adolf Krige; Paul Christakopoulos; Sebastià Puig; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MFC; Microbial fuel cell; Raman microscopy; BES; Geobacter sulfurreducens; Biokemisk processteknik; Biochemical Process Engineering;

    Sammanfattning : Since the 1900’s it has been known that microorganisms are capable of generating electrical power through extracellular electron transfer by converting the energy found organic compounds (Potter, 1911). Microbial fuel cells (MFCs) has garnered more attention recently, and have shown promise in several applications, including wastewater treatment (Yakar et al. LÄS MER

  7. 5. Parameters optimization of oil well drilling operation

    Författare :Ali Darwesh; Thorkild Maack Rasmussen; Nadhir Al-Ansari; Daniel Ask; Bernt Sigve Aadnøy; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bazian Block; Kurdistan; Iraq; Optimization; Drilling Parameters; Rate of Penetration; Wiper trips; Kicks; Pay zone; Bourgoyne and Young model; Exploration Geophysics; Prospekteringsgeofysik;

    Sammanfattning : In the beginning of 2005, the ministry of natural resources in the Kurdistan region of Iraq dividedits territory into more than 50 oil blocks based on geological setting. These oil blocks were awardedlater to different international oil companies for oil investments based on Production SharingContracts (PSCs). LÄS MER