Sökning: "fragmentation mechanism"

Visar resultat 1 - 5 av 60 avhandlingar innehållade orden fragmentation mechanism.

  1. 1. Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Daniel Norberg; Uppsala universitet.; [2007]
    Nyckelord :Quantum chemistry; quantum chemistry; coupled-cluster; density functional theory; meta-GGA; reaction mechanism; potential energy surface; isomerization; fragmentation; dissociation; condensation; addition; SH2; hydrogen abstraction; iodine atom transfer; complex; weakly interacting system; hyperfine coupling constant; Kvantkemi;

    Sammanfattning : Quantum chemical calculations have been performed to investigate radical cation rearrangement, radical carbonylation, and homolytic substitution reactions of organic molecules.The rearrangement of the bicyclopropylidiene radical cation to the tetramethyleneethane radical cation is predicted to proceed with stepwise disrotatory opening of the two rings. LÄS MER

  2. 2. Burden Dynamics and Fragmentation

    Detta är en avhandling från Luleå tekniska universitet

    Författare :Nikolaos Petropoulos; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : Drill and blast is a dominant technique in several surface and underground mines in the world. The purpose of this technique is to break rock mass into fragments, which can be handled by mining equipment. The identified major influencing factors in rock blasting are stress waves and gas pressurization. LÄS MER

  3. 3. New Proteomics Methods and Fundamental Aspects of Peptide Fragmentation

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Mikhail Savitski; Uppsala universitet.; [2007]
    Nyckelord :Bioinformatics; Proteomics; Peptide fragmentation; Bioinformatik;

    Sammanfattning : The combination of collision-activated dissociation, (CAD) and electron capture dissociation, (ECD) yielded a 125% increase in protein identification. The S-score was developed for measuring the information content in MS/MS spectra. This measure made it possible to single out good quality spectra that were not identified by a search engine. LÄS MER

  4. 4. Mass Spectrometric Analysis of Oxylipins Application to Cytochrome P450-Dependent Metabolism

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tomas Nilsson; Ernst Oliw; Johan Bylund; Mikael Hedeland; [2009]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; epoxyalcohols; fatty acids; hydroperoxides; electrospray ionization; ichthyosis; CYP4; linear ion trap; fragmentation mechanism; PHARMACY Pharmaceutical pharmacology; FARMACI 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

  5. 5. Interactions of chiral ions and molecules in gas phase Towards an understanding of chiral recognition mechanism

    Detta är en avhandling från Stockholm : Department of Physics, Stockholm University

    Författare :Oleksii Rebrov; Mats Larsson; Richard Thomas; Vitali Zhaunerchyk; Anne Zehnacker-Rentien; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; fysik;

    Sammanfattning : This thesis comprises the research related to interactions of enantiopure amino acids with chiral and achiral molecules in gas phase. The investigation of the mechanism responsible for chiral discrimination is of the special interest in this work. LÄS MER