Excited-state dynamics of carotenoids in light-harvesting complexes. 2. Dissecting pulse structures from optimal control experiments

Article Abstract:

Dispersed multipump-probe (PPP) spectroscopy is used to investigate the role of saturation, annihilation and structures pulses in coherent control experiments on the light-harvesting 2 complex from Rhodopseudomonas acidophila. The conditions that are required for incoherent effects to control experimental signals are discussed with particular emphasis on pulse intensities and are shown that the optimization of a ratio of conservative signals is needed to exclude saturation effects from coherent control studies.

Carotenoids, Excited state chemistry

---

Do proteins at low temperature behave as glasses? A single-molecule study

Article Abstract:

Long spectral diffusion trajectories from individual LH2 pigment-protein complexes from the purple bacterium Rhodobacter sphaeroides at 1.4 K were recorded. It seems that that first and second cumulants cannot be described by the predictions of the well tested standard two-level system (TLS) model for spectral diffusion in glasses and the results show that there is a basic difference between the relaxation behavior of the test protein and that of glasses.

STONE, CLAY, AND GLASS PRODUCTS, Glass Products, Glass and Glass Product Manufacturing, Analysis, Glass, X-ray crystallography, Bacterial proteins, Diffusion, Diffusion (Physics), Properties, Structure

---

Stark spectroscopy on the LH2 complex from rhodobacter sphaeroides strain G1C; frequency and temperature dependence

Article Abstract:

Electroabsorption (Stark effect) spectroscopy using dual-phase lock-in detection was applied to the B850 absorption band of the peripheral antenna (LH2) complex from the purple non-sulfur bacterium Rhodabacter sphaeroides strain G1C. Electroabsorption signals due to the electrostatic interaction between pigments and surrounding apoproteins were clearly detected from the phase-retarded signal.

Sulfur bacteria, Sulphur bacteria, Stark effect

Similar abstracts:

• Abstracts: Implicit solvent simulations of DNA and DNA-protein complexes: Agreement with explicit solvent vs. experiment
• Abstracts: Fast and slow dynamics of water-soluble dendrimers consisting of amido-amine repeating units by neutron spin-echo
• Abstracts: An ab initio study on the effect of carbon surface curvature and ring structure on N2(O2)-carbon intermolecular potentials
• Abstracts: Excited-state properties of flavin radicals in flavoproteins: femtosecond spectroscopy of DNA photolyase, glucose oxidase, and flavodoxin
• Abstracts: Simultaneous transport of water and organic molecules through polyelectrolyte membranes. Self-consistent field theory of polyelectrolyte systems

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.