Sökning: "photon lifetime"

Visar resultat 11 - 15 av 47 avhandlingar innehållade orden photon lifetime.

  1. 11. Electronic Energy Migration/Transfer as a Tool to Explore Biomacromolecular Structures

    Författare :Therese Mikaelsson; Lennart B.-Å. Johansson; Kristine Kilså; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fluorescence; electronic energy transfer; two-photon excitation; small ribosomal protein S16; macromolecular crowding; dextran 20; fysikalisk kemi; Physical Chemistry;

    Sammanfattning : Fluorescence-based techniques are widely used in bioscience, offering a high sensitivity and versatility. In this work, fluorescence electronic energy migration/ transfer is applied to measure intramolecular distances in two types of systems and under various conditions. LÄS MER

  3. 12. Exploring nanosystems for biomedical applications focusing on photodynamic therapy and drug delivery

    Författare :Vladimir Kirejev; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Photodynamic therapy; PDT enhancement; Nitric oxide; NO-based PDT; Targeted drug delivery; Galectin-3; mTHPP; Cyclodextrin; CD-mTHPP conjugate; PpIX AuNP combination; Two-photon microscopy; FLIM; Cell phototoxicity; Ex vivo skin;

    Sammanfattning : The increasing incidences of cancer and related deaths call for the development of new and improved treatment modalities. Photodynamic therapy (PDT) today is an alternative to conventional treatments, but has limitations. This thesis explores different nanosystems with aim to improve PDT focusing on spectroscopic and ex vivo studies. LÄS MER

  4. 13. Structured Light for Ultrafast Videography

    Författare :Vassily Kornienko; Förbränningsfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Structured Light; FRAME; Coherence Lifetime Imaging; Optical Diagnostics; Ultrafast Videography; Strukturerad Belysning; FRAME; Koherent Livstidsavbildning; Optisk diagnostik; Ultrasnabb videografi;

    Sammanfattning : Monitoring natural events at ultrafast timescales is a prerequisite for our continued understanding of physical, chemical and biological processes. Due to exponential advancements in knowledge and optical technology, the field of ultrafast videography has seen a sudden uptick in activity beginning in the mid-2010s. LÄS MER

  5. 14. Excited state dynamics in the strong coupling regime

    Författare :Jürgen Mony; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Strong exciton-photon coupling; Excited state dynamics; light-matter interactions; photoswitch; aggregated states;

    Sammanfattning : Strong exciton-photon coupling exhibits the possibility to modify photophysical and photochemical properties of organic molecules without changing their structure. This is due to the formation of hybrid light-matter states, called polaritons, which are created when the strong coupling regime is achieved. LÄS MER

  7. 15. Electronic Energy Transfer within Asymmetric Pairs of Fluorophores: Partial Donor-Donor Energy Migration (PDDEM)

    Författare :Stanislav Kalinin; Lennart B.-Å. Johansson; Helge Lemmetyinen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; fluorescence resonance energy transfer FRET ; donor-donor energy migration DDEM ; homotransfer; fluorescence relaxation; lifetimes; time-resolved fluorescence anisotropy; time-correlated single photon counting; distance measurements; protein structure; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : A kinetic model of electronic energy migration within pairs of photophysically non-identical fluorophores has been developed. The model applies to fluorescent groups that exhibit different photophysical and spectral properties when attached to different positions in a macromolecule. LÄS MER