Search for dissertations about: "repeated samples"

Showing result 1 - 5 of 154 swedish dissertations containing the words repeated samples.

  2. 1. Inductively Coupled Plasma Atomic Emission Spectrometry : Exploring the Limits of Different Sample Preparation Strategies

    Author : Barbro Kollander; Jean Pettersson; Marit Andersson; Jonas Bergquist; Grethe Wibetoe; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; multi element analysis; trace element; ICP-AES; inductively coupled plasma atomic emission spectromtery; water analysis; liver analysis; non digested samples; medical samples; biological samples; samples from biopsies and autopsies; mice organ; fast analysis; internal standard; preconcentration; matrix elimination; Cu; Zn; Mn; Co; Pb; Cd; Mg; Ca; Fe; Ni; Cr; S; P; K; Al; Analytical chemistry; Analytisk kemi; Analytical Chemistry; Analytisk kemi;

    Abstract : This thesis describes two different sample preparation strategies for inductively coupled plasma atomic emission spectrometry (ICP-AES), and their ability regarding multi element quantification in complex samples. Sensitivity, repeatability, reproducibility and accuracy were investigated. READ MORE

  4. 2. Molecular epidemiology approach : nested case-control studies in glioma and lymphoid malignancies

    Author : Florentin Späth; Beatrice S. Melin; Carl Wibom; Ann Sofie Johansson; Ingvar Bergdahl; Ola Landgren; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Glioma; B cell lymphoma; multiple myeloma; risk; repeated samples; prospective longitudinal study; nested case-control study; circulating sEGFR and sERBB2; circulating immune markers and growth factors; marker disease association; disease progression; NSHDS; Janus; linear mixed modeling; epidemiologi; Epidemiology; Oncology; onkologi;

    Abstract : BACKGROUND: Nested case-control studies aim to link molecular markers with a certain outcome. Repeated prediagnostic samples may improve the evaluation of marker-disease associations. However, data regarding the benefit of repeated samples in such studies are sparse. READ MORE

  5. 3. Nonlinear Quantile Regression for Longitudinal Data

    Author : Andreas Karlsson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; bootstrap; dependent errors; median regression; Monte Carlo simulation; panel data; repeated measures; Statistics; Statistik; Biostatistics; Biostatistik;

    Abstract : The overall objective of the two papers in this thesis is to examine the properties of the weighted nonlinear quantile regression estimator for the analysis of longitudinal data. To this end, the question of which weights to be used, the bias of the estimator and the possibility to calculate confidence intervals has to be examined. READ MORE

  6. 4. Liquid Chromatography – Mass Spectrometry Analysis of Short-lived Tracers in Biological Matrices : Exploration of Radiotracer Chemistry as an Analytical Tool

    Author : Martin Lavén; Karin Markides; Bengt Långström; Rolf Ekman; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; liquid chromatography - mass spectrometry; radiotracer chemistry; positron emission tomography; biological samples; radionuclide imaging; Analytisk kemi; Analytical chemistry; Analytisk kemi;

    Abstract : Liquid chromatography – mass spectrometry (LC-MS) methods were developed for the analysis of positron emission tomography (PET) radiotracers in biological matrices. Additionally, radiotracer chemistry was explored as an analytical tool for supporting LC-MS method development and imaging molecular interactions in miniaturised chemical analysis systems. READ MORE

  7. 5. Complementary feeding based on Nordic foods : effects on nutrient intake, growth, biomarkers and eating behavior

    Author : Ulrica Johansson; Torbjörn Lind; Inger Öhlund; Lene Lindberg; Anna Winkvist; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Infant feeding; healthy diet; food preference; complementary feeding; eating behavior; repeated exposure; vegetables; fruit; Nordic diet; sustainable diet; nutrition; roots; berries; flavor learning; pediatrik; Pediatrics; Medicine; medicin; Nutrition; näringslära; Public health; folkhälsa;

    Abstract : Background: Early nutrition is fundamental to growth and development. Infants develop long lasting food preferences very early in life from food exposures when the brain is impressionable and sensory pathways are receptive. READ MORE