Sökning: "Anna Stenberg"

Hittade 2 avhandlingar innehållade orden Anna Stenberg.

  1. 1. Isotopic analyses of biological materials by single and multi-collector sector field ICP-MS

    Författare :Anna Stenberg; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Investigations concerning naturally occurring, mass dependent isotope fractionation of transition elements in biological materials have only been carried out during a very short period of time. Due to the lack of detailed descriptions of the analytical performance in previously reported work, the major focus of this study has therefore been to evaluate aspects of sample preparation and detection for obtaining precise and accurate isotopic ratios by multi-collector inductively coupled plasma mass spectrometry (MC- ICP-MS) using high mass-resolution. LÄS MER

  3. 2. Methodological aspects of unspecific building related symptoms research

    Författare :Bo Glas; Berndt Stenberg; Anna-Lena Sunesson; Erik Zimerson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Sick building syndrome; SBS; exposure measurement; GC-MS; questionnaire; symptom; variability; PCA; PLS-DA; Occupational medicine; Yrkesmedicin;

    Sammanfattning : This thesis deals with methological issues in the study of chemical exposure and sick building syndrome (SBS). SBS is a combination of general, mucosal and skin symptoms that some people experience when staying in specific buildings. The aim was to find chemical patterns associated with SBS, but also to address methological problems in such study. LÄS MER