Sökning: "linear ion trap"

Hittade 4 avhandlingar innehållade orden linear ion trap.

  1. 1. Numerical simulation of the dynamics of a trapped molecular ion

    Författare :Avazeh Hashemloo; Claude Dion; Michael Drewsen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; diatomic molecular ion; linear Paul trap; rigid rotor; quantum rotational dynamics; wave-packet dynamics; time-dependent Schrödinger equation; stability;

    Sammanfattning : This thesis explores the dynamics of a heteronuclear diatomic molecular ion, possessing a permanent electric dipole moment, µ, which is trapped in a linear Paul trap and can interact with an off-resonance laser field. To build our model we use the rigid-rotor approximation, where the dynamics of the molecular ion are limited to its translational and rotational motions of the center-of-mass. LÄS MER

  3. 2. Mass Spectrometric Analysis of Oxylipins : Application to Cytochrome P450-Dependent Metabolism

    Författare :Tomas Nilsson; Ernst Oliw; Johan Bylund; Mikael Hedeland; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; epoxyalcohols; fatty acids; hydroperoxides; electrospray ionization; ichthyosis; CYP4; linear ion trap; fragmentation mechanism; Pharmaceutical pharmacology; Farmaceutisk farmakologi; Biochemical Pharmacology; Biokemisk farmakologi;

    Sammanfattning : Cytochrome P450 (CYP) family 4 constitutes monoxygenases responsible for hydroxylation of fatty acids and other lipids. For example, CYP4F3 metabolizes leukotrienes and CYP4F8 prostaglandin H. Importantly, six of the twelve CYP4 enzymes are orphans, i.e. LÄS MER

  4. 3. Novel Solid Phase Extraction and Mass Spectrometry Approaches to Multicomponent Analyses in Complex Matrices

    Författare :Nahid Amini; Gunnar Thorsén; Tuulia Hyötyläinen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sample preparation; SPE; RAM; GCB µ-trap; GCB disk; High temperature LC; LC MS; ESI; APCI; Matrix effects; LIT-MS; SALDI; Sample screening; Oxidized GCB; Silicon nitride; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

    Sammanfattning : Analysis of compounds present in complex matrices is always a challenge, which can be partly overcome by applying various sample preparation techniques prior to detection. Ideally, the extraction techniques should be as selective as possible, to minimize the concentration of interfering substances. LÄS MER

  5. 4. Purification, structure and function of bioactive peptides

    Författare :Elo Eriste; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Peptides are vitally important molecules and many evoke cellular responses. The completion of several genome sequencing projects has revealed a number of new genes. LÄS MER