scholarly journals Exciton delocalization, charge transfer, and electronic coupling for singlet excitation energy transfer between stacked nucleobases in DNA: An MS-CASPT2 study

2014 ◽  
Vol 140 (9) ◽  
pp. 095102 ◽  
Author(s):  
Lluís Blancafort ◽  
Alexander A. Voityuk
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Electronic Coupling

Charge transfer-induced assembly of a gold nanocomposite mediated by N-methylfulleropyrrolidine: excitation energy transfer from Rhodamine B

2017 ◽  
Vol 41 (6) ◽  
pp. 2401-2408 ◽  
Author(s):  
Sanjeeb Sutradhar ◽  
Archita Patnaik
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Excitation Energy ◽  
Rhodamine B ◽  
Excitation Energy Transfer ◽  
Aurophilic Interactions ◽  
Composite Self ◽  
Energy Acceptor ◽  
Ph Controlled

A pH controlled functionalized fullerene-C60-gold NP composite self-assembles via electrostatic as well as aurophilic interactions and acts as an excitation energy acceptor from fluorescent Rhodamine B (3.79 × 6.5 inch).

scholarly journals Chlorophyll–carotenoid excitation energy transfer and charge transfer in Nannochloropsis oceanica for the regulation of photosynthesis

2019 ◽  
Vol 116 (9) ◽  
pp. 3385-3390 ◽  
Author(s):  
Soomin Park ◽  
Collin J. Steen ◽  
Dagmar Lyska ◽  
Alexandra L. Fischer ◽  
Benjamin Endelman ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Excitation Energy ◽  
Transient Absorption ◽  
Excitation Energy Transfer ◽  
Excited State Absorption ◽  
Thermal Dissipation ◽  
Live Cells ◽  
Nannochloropsis Oceanica

Nonphotochemical quenching (NPQ) is a proxy for photoprotective thermal dissipation processes that regulate photosynthetic light harvesting. The identification of NPQ mechanisms and their molecular or physiological triggering factors under in vivo conditions is a matter of controversy. Here, to investigate chlorophyll (Chl)–zeaxanthin (Zea) excitation energy transfer (EET) and charge transfer (CT) as possible NPQ mechanisms, we performed transient absorption (TA) spectroscopy on live cells of the microalga Nannochloropsis oceanica. We obtained evidence for the operation of both EET and CT quenching by observing spectral features associated with the Zea S1 and Zea●+ excited-state absorption (ESA) signals, respectively, after Chl excitation. Knockout mutants for genes encoding either violaxanthin de-epoxidase or LHCX1 proteins exhibited strongly inhibited NPQ capabilities and lacked detectable Zea S1 and Zea●+ ESA signals in vivo, which strongly suggests that the accumulation of Zea and active LHCX1 is essential for both EET and CT quenching in N. oceanica.

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