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Visar resultat 1 - 5 av 18 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Faraday modulation spectroscopy : Theoretical description and experimental realization for detection of nitric oxide

    Författare :Jonas Westberg; Ove Axner; Gerard Wysocki; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Faraday modulation spectroscopy FAMOS ; Westberg-Wang-Axner WWA method; Fourier coefficients; Lineshape asymmetries; Nitric oxide NO ; fysik; Physics;

    Sammanfattning : Faraday modulation spectroscopy (FAMOS) is a laser-based spectroscopic dispersion technique for detection of paramagnetic molecules in gas phase. This thesis presents both a new theoretical description of FAMOS and experimental results from the ultra-violet (UV) as well as the mid-infrared (MIR) regions. LÄS MER

  3. 2. Lab on a chip for electrophysiological measurements with control of the oxygen content : optical manipulation and spectroscopic analysis of biological cells

    Författare :Ahmed Alrifaiy; Ove Axner; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Medical Engineering for Healthcare; Medicinsk teknik för hälsovård;

    Sammanfattning : Stroke affects nearly 20 million people around the world every year. Clinically, stroke is a result of brain damage due to the shortage of oxygen delivered to the nerve cells. To minimize suffering and costs related to the disease, extensive research is performed on different levels. LÄS MER

  4. 3. Construction of force measuring optical tweezers instrumentation and investigations of biophysical properties of bacterial adhesion organelles

    Författare :Magnus Andersson; Ove Axner; Lene Broeng Oddershede; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; optical tweezers; biological physics; unfolding; Escherichia coli; force measurements; energy landscape; dynamic force spectroscopy; manipulation; polymers; pili; Physics; Fysik;

    Sammanfattning : Optical tweezers are a technique in which microscopic-sized particles, including living cells and bacteria, can be non-intrusively trapped with high accuracy solely using focused light. The technique has therefore become a powerful tool in the field of biophysics. LÄS MER

  5. 4. A study of bacterial adhesion on a single-cell level by means of force measuring optical tweezers and simulations

    Författare :Oscar Björnham; Staffan Schedin; Ove Axner; Kirstine Berg-Sörensen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; fysik; Physics; cell research; cellforskning; molecular cell biology; molekylär cellbiologi;

    Sammanfattning : The intriguing world of microbiology is nowadays accessible for detailed exploration at a single–molecular level. Optical tweezers are a novel instrument that allows for non–invasive manipulation of single cells by the sole use of laser light and operates on the nano– and micrometer scale which corresponds to the same length scale as living cells. LÄS MER

  7. 5. Enhancement of few-cycle light fields for relativistic nanophotonics

    Författare :Aitor de Andres Gonzalez; Laszlo Veisz; Ove Axner; Rodrigo Lopez-Martens; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Vacuum laser acceleration; spatio-spectral characterization; relativistic nanophotonics; optical parametric synthesis; fysik; Physics;

    Sammanfattning : Pulses of light that are both ultrashort and ultraintense are often generated using optical parametric amplifiers (OPA). These are capable of driving highly non-linear interactions with matter, which are interesting when studying the fundamental laws of our universe. LÄS MER