High-light modification of excitation-energy-relaxation processes in the green flagellate Euglena gracilis

2021 ◽  
Author(s):  
Ryo Nagao ◽  
Makio Yokono ◽  
Ka-Ho Kato ◽  
Yoshifumi Ueno ◽  
Jian-Ren Shen ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Euglena Gracilis ◽  
Energy Relaxation ◽  
High Light ◽  
Relaxation Processes ◽  
Green Flagellate

Picosecond excitation energy relaxation processes in a ladder-type π-conjugated polymer

2006 ◽  
Vol 429 (1-3) ◽  
pp. 103-108 ◽  
Author(s):  
Richard Hildner ◽  
Ulrich Lemmer ◽  
Ullrich Scherf ◽  
Jürgen Köhler
Keyword(s):  
Excitation Energy ◽  
Conjugated Polymer ◽  
Energy Relaxation ◽  
Relaxation Processes ◽  
Picosecond Excitation

Excitation energy relaxation in chlorophyll a Langmuir-Blodgett multilayer films

1993 ◽  
Author(s):  
Nikolai V. Tkachenko ◽  
D. Grandell ◽  
Marjo Ikonen ◽  
A. Jutila ◽  
V. Moritz ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Chlorophyll A ◽  
Multilayer Films ◽  
Energy Relaxation ◽  
Langmuir Blodgett

Carotenoids and Photosystem II Characteristics of Upper and Lower Halves of Leaves Acclimated to High Light

1996 ◽  
Vol 23 (6) ◽  
pp. 669 ◽  
Author(s):  
WW Iii Adams ◽  
B Demmig-Adams ◽  
DH Barker ◽  
S Kiley
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Total Energy ◽  
Xanthophyll Cycle ◽  
Lower Surface ◽  
Thylakoid Membranes ◽  
High Light ◽  
Pigment Composition ◽  
Light Gradient

Acclimation of the leaves or stems of four succulent species to different light environments and to the light gradient across high light-acclimated tissues was examined through measurements of chlorophyll fluorescence and characterisation of the pigment composition of the thylakoid membranes. Whereas the total amounts of light striking the upper (sun-exposed) and lower (self-shaded) surfaces were quite different, resulting in a much smaller pool of the xanthophyll cycle carotenoids in the lower halves of high light-acclimated tissues, the conversion state of the xanthophyll cycle (the degree to which violaxanthin is converted to antheraxanthin and zeaxanthin) was similar throughout the tissues during exposure to natural sunlight. Under full sunlight, less than 25% of the light absorbed by the upper surface was utilised through photosynthesis, with the majority of the remaining excitation energy being dissipated thermally. In contrast, a considerably greater fraction of the light absorbed by the lower surface was utilised in photosynthesis, ranging from one-third to more than two-thirds of the total energy absorbed.

Femtosecond and Hole-Burning Studies of B800's Excitation Energy Relaxation Dynamics in the LH2 Antenna Complex ofRhodopseudomonas acidophila(Strain 10050)

1996 ◽  
Vol 100 (29) ◽  
pp. 12022-12033 ◽  
Author(s):  
H.-M. Wu ◽  
S. Savikhin ◽  
N. R. S. Reddy ◽  
R. Jankowiak ◽  
R. J. Cogdell ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Energy Relaxation ◽  
Hole Burning ◽  
Relaxation Dynamics ◽  
Antenna Complex

A very rapid electronic relaxation process in a highly conjugated Zn(ii)porphyrin–[26]hexaphyrin–Zn(ii)porphyrin hybrid tape

2016 ◽  
Vol 18 (4) ◽  
pp. 3244-3249 ◽  
Author(s):  
Sangsu Lee ◽  
Hirotaka Mori ◽  
Taegon Lee ◽  
Manho Lim ◽  
Atsuhiro Osuka ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Vibrational Relaxation ◽  
Energy Relaxation ◽  
Relaxation Processes ◽  
Electronic Relaxation ◽  
Vibronic State ◽  
Molecular Systems

We demonstrate that the electronic deactivation overtakes the vibrational relaxation processes in the energy relaxation processes from the initially excited vibronic state manifolds in highly conjugated molecular systems.

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