A5050480031- Photosynthetic Processes and Mechanisms
- Photoreceptor and optogenetics research
- Spectroscopy and Quantum Chemical Studies
- Light effects on plants
- Algal biology and biofuel production
- Photochemistry and Electron Transfer Studies
- Porphyrin and Phthalocyanine Chemistry
- Antioxidant Activity and Oxidative Stress
- DNA and Nucleic Acid Chemistry
- Advanced Fluorescence Microscopy Techniques
- Marine and coastal ecosystems
- Plant Stress Responses and Tolerance
- Mitochondrial Function and Pathology
- bioluminescence and chemiluminescence research
- Protein Structure and Dynamics
- Electrochemical Analysis and Applications
- Molecular spectroscopy and chirality
- Bacteriophages and microbial interactions
- Plant and animal studies
- Enzyme Structure and Function
- Molecular Junctions and Nanostructures
- Retinal Development and Disorders
- Microbial Community Ecology and Physiology
- Protein Interaction Studies and Fluorescence Analysis
- ATP Synthase and ATPases Research
Vrije Universiteit Amsterdam
2014-2024
Canadian Institute for Advanced Research
2018-2022
University of Amsterdam
2000-2018
University of Pretoria
2016-2017
Amsterdam UMC Location VUmc
2014-2017
Amsterdam University of Applied Sciences
2017
University of Glasgow
1997-2016
Institut de Biologie Moléculaire et Cellulaire
2016
Charles University
2016
Czech Academy of Sciences, Institute of Physics
2016
Great progress in the study of structure and dynamics photosynthetic light-harvesting pigment−protein complexes has recently resulted detailed understanding light-...
We overview experimental and theoretical studies of energy transfer in the photosynthetic light-harvesting complexes LH1, LH2, LHCII performed during past decade since discovery high-resolution structure these complexes. Experimental findings obtained with various spectroscopic techniques makes possible a modelling excitation dynamics at quantitative level. The modified Redfield theory allows precise assignment pathways together direct visualization whole where regimes from coherent motion...
We present temperature-dependent fluorescence quantum yield and lifetime measurements on the LH-1 LH-2 complexes of Rhodobacter sphaeroides isolated B820 subunit Rhodospirillum rubrum. From these superradiance is calculated, which related to delocalization excitations in complexes. In preparation we find a radiative rate that 30% higher than monomeric bacteriochlorophyll, agreement with dimer model this subunit. At room temperature both are superradiant relative Bchl-a enhancement factors...
Intense sunlight is dangerous for photosynthetic organisms. Cyanobacteria, like plants, protect themselves from light-induced stress by dissipating excess absorbed energy as heat. Recently, it was discovered that a soluble orange carotenoid protein, the OCP, essential this photoprotective mechanism. Here we show OCP also member of family photoactive proteins; unique example protein containing photoresponsive chromophore. Upon illumination with blue-green light, undergoes reversible...
Since the crystal structure of major light-harvesting complex II (LHCII) green plants was obtained by Kühlbrandt, Wang and Fujiyoshi (Nature 1994, 367, 614−621), this chlorophyll-containing trimeric membrane protein has been subject intensive investigation. The contains between 36 42 chlorophyll molecules per trimer (Chl a Chl b) 10 to 12 xanthophyll (lutein, neoxanthin violaxanthin). displays rich spectrum interactions, both pigments protein, these interactions have studied with multitude...
Carotenoids are important biomolecules that ubiquitous in nature and find widespread application medicine. In photosynthesis, they have a large role light harvesting (LH) photoprotection. They exert their LH function by donating excited singlet state to nearby (bacterio)chlorophyll molecules. photosynthetic bacteria, the efficiency of this energy transfer process can be as low 30%. Here, we present evidence an unusual pathway relaxation carotenoids underlies poor function, which carotenoid...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcitation Transfer in the Core Light-Harvesting Complex (LH-1) of Rhodobacter sphaeroides: An Ultrafast Fluorescence Depolarization and Annihilation StudyStephen E. Bradforth, Ralph Jimenez, Frank van Mourik, Rienk Grondelle, Graham R. FlemingCite this: J. Phys. Chem. 1995, 99, 43, 16179–16191Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October...
We have modeled steady-state spectra and energy-transfer dynamics in the peripheral plant light-harvesting complex LHCII using new structural data (Liu, Z.; Yan, H.; Wang, K.; Kuang, T.; Zhang, J.; Gui, L.; An, X.; Chang, W. Nature. 2004, 428, 287). The of chlorophyll (Chl) b→Chl a transfer decay selectively excited "bottleneck" Chl b states been studied by femtosecond pump−probe spectroscopy. propose an exciton model trimer (with specific site energies) which allows simultaneous...
We consider a model of the photosystem II (PS II) reaction center in which its spectral properties result from weak (approximately 100 cm-1) excitonic interactions between majority chlorins. Such is consistent with structure similar to that purple bacteria but reduced coupling chlorophyll special pair. find this many experimental studies PS II. The similarity magnitude exciton and energetic disorder results states being structurally highly heterogeneous. This suggests P680, primary electron...