Peridinin, a nor-carotenoid, exhibits an exceptionally high energy transfer efficiency to chlorophyll a in photosynthesis in the sea. This efficiency would be related to the unique structure of peridinin. To answer the question of why peridinin possesses the irregular C37 skeleton, we have achieved the synthesis of three peridinin derivatives. Their ultrafast time-resolved optical absorption and Stark spectra measurements have shown the presence of the characteristic intramolecular charge transfer state and the featured electrostatic properties of peridinin.
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http://dx.doi.org/10.1021/ol901940g | DOI Listing |
J Chem Phys
December 2024
Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy.
In this work, we present a multiscale real-time approach to study the plasmonic effects of a metal nanoparticle (NP) on the electronic circular-dichroism (ECD) spectrum of a chiral molecule interacting with it. The method is based on the time-evolution of the molecule's time-dependent wavefunction, expanded in the eigenstates of a perturbed Hamiltonian. A quantum description of the molecular system is coupled to a classical representation of the NP via a continuum model.
View Article and Find Full Text PDFToxins (Basel)
October 2024
Department of Chemical Engineering, University of Almeria, 04120 Almeria, Spain.
This study investigated the impact of culture medium salinity (5-50 PSU) on the growth and maximum photochemical yield of photosystem II (/) and the composition of carotenoids, fatty acids, and bioactive substances in three marine microalgae (, , and ). The microalgae were photoautotrophically cultured in discontinuous mode in a single stage (S1) and a two-stage culture with salt shock (S2). A growth model was developed to link biomass productivity with salinity for each species.
View Article and Find Full Text PDFPlant Mol Biol
October 2024
School of Science and Technology, Hong Kong Metropolitan University, Hong Kong SAR, China.
Photosynthetic dinoflagellates play crucial roles in global primary production and carbon fixation. Despite their success in filling various ecological niches, numerous mysteries about their plastid evolution and plastid genomes remain unsolved. The plastid genome of dinoflagellates presents one of the most complex lineages in the biological realm, mainly due to multiple endosymbiotic plastid events in their evolutionary history.
View Article and Find Full Text PDFMar Pollut Bull
December 2024
Centre for Marine Living Resource and Ecology, Ministry of Earth Sciences, Kochi, India; Environmental Studies department, GITAM (Deemed to be University), Visakhapatnam, India. Electronic address:
Submarine groundwater discharge is a pivotal factor in modifying the structure of phytoplankton communities in coastal waters. The objective of the study was to investigate how variations in nutrient concentrations and ratios influence the composition of phytoplankton communities along the coastal waters of Bay of Bengal. The experiment involved mixing groundwater with coastal water at 5 % and 10 % proportions.
View Article and Find Full Text PDFBiochim Biophys Acta Bioenerg
January 2025
Protein Crystallography, Faculty of Biology and Biotechnology, Ruhr University Bochum, 44801 Bochum, Germany. Electronic address:
Light harvesting proteins are optimized to efficiently collect and transfer light energy for photosynthesis. In eukaryotic dinoflagellates these complexes utilize chlorophylls and a special carotenoid, peridinin, and arrange them for efficient excitation energy transfer. At the same time, the carotenoids protect the system by quenching harmful chlorophyll triplet states.
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