Sökning: "Stefan Öberg"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Stefan Öberg.

  1. 1. The Columnar Lined Esophagus. Pathophysiological and Clinical Aspects

    Författare :Stefan Öberg; Lund Kirurgi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Intestinal metaplasia; Barrett s esophagus; Esophageal columnar metaplasia; Metaplasia; Pathophysiology; Gastroesophageal reflux disease; Esophagus; Surgery; orthopaedics; traumatology; Kirurgi; ortopedi; traumatologi;

    Sammanfattning : There is a persisting controversy concerning the definition, etiology and pathogenesis of Barrett's esophagus. The dramatic and parallel increase in the incidence of esophageal and junctional adenocarcinoma over the past decades justifies an evaluation of the pathophysiology of premalignant metaplastic changes of the esophagus and the gastroesophageal junction. LÄS MER

  3. 2. Social bodies : family and community level influences on height and weight, southern Sweden 1818-1968

    Författare :Stefan Öberg; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; height; weight; body mass index; demography; demographic history; anthropometry; anthropometric history; standards of living; socioeconomic status; socioeconomic differences; resource dilution hypothesis; infant mortality; early life;

    Sammanfattning : This dissertation consists of an introduction, four research papers and one paper describing the data I collected for the studies and how I conducted the study. I collected information on men from conscript inspection lists and linked this to a sample of men in the Scanian Economic Demographic Database (SEDD) born between 1797 and 1950. LÄS MER

  4. 3. Creep Behavior of High Temperature Cast Materials for Exhaust Applications

    Författare :Christian Öberg; Stefan Jonsson; Baohua Zhu; John Hald; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Creep; creep behaviour; creep damage; ductile cast iron; high-alloyed austenitic cast steel; thermal cycling; tensile testing; stress relaxation; oxidation; precipitation.; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : This thesis focuses on creep of four cast materials intended for exhaust manifolds in heavy-duty truck engines. Two of the materials are ferritic ductile cast irons, SiMo51 and SiMo1000, one is an austenitic ductile cast iron, D5S, and another one is an austenitic cast steel, HK30. LÄS MER

  5. 4. Thermal Cycling, Creep- and Tensile Testing of Cast Exhaust Materials at Elevated Temperatures

    Författare :Christian Öberg; Stefan Jonsson; Henrik Östling; KTH; []
    Nyckelord :creep; constant-load; thermal cycling; tensile test; cast materials; cast iron; exhaust materials.; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : An exhaust manifold of a truck engine is subjected to tough conditions. As the truck is started, operated and shut down, it becomes subjected to thermal cycling up to around 800°C. At such high temperatures, corrosion, fatigue and creep are active degradation mechanisms. LÄS MER

  7. 5. The Role of Polyadenylation in Human Papillomavirus Type 16 Late Gene Expression

    Författare :Daniel Öberg; Stefan Schwartz; Sheila Graham; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular biology; HPV-16; polyadenylation; mRNA stability; codon usage; hnRNP H; DSE; splicing; negative element; RNA processing; Molekylärbiologi; Molecular biology; Molekylärbiologi;

    Sammanfattning : High-risk type human papillomaviruses (HPVs) are associated with cancer. HPVs are strictly epitheliotropic and infect basal cell layers, establishing a life cycle strongly linked to the differentiation stage of the infected cells. The viral capsid late genes, L2 and L1, are only expressed in terminally differentiated epithelium. LÄS MER