Femtosecond infrared spectroscopy of chlorophyll f-containing photosystem I

2019 ◽  
Vol 21 (3) ◽  
pp. 1224-1234 ◽  
Author(s):  
Noura Zamzam ◽  
Marius Kaucikas ◽  
Dennis J. Nürnberg ◽  
A. William Rutherford ◽  
Jasper J. van Thor
Keyword(s):  
Infrared Spectroscopy ◽  
Photosystem I ◽  
Charge Separation ◽  
Light Harvesting ◽  
Red Light ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy ◽  
Chlorophyll F

Femtosecond time resolved infrared spectroscopy of far-red light grown photosystem I shows chlorophyll f contributions in light harvesting and charge separation.

scholarly journals The natural design for harvesting far-red light: the antenna increases both absorption and quantum efficiency of Photosystem II

2021 ◽  
Author(s):  
Vincenzo Mascoli ◽  
Ahmad Farhan Bhatti ◽  
Luca Bersanini ◽  
Herbert van Amerongen ◽  
Roberta Croce
Keyword(s):  
Photosystem Ii ◽  
Charge Separation ◽  
Light Harvesting ◽  
Structural Information ◽  
Red Light ◽  
Time Resolved Fluorescence ◽  
Light Harvesting Complexes ◽  
Time Resolved ◽  
Light Energy Conversion ◽  
Chlorophyll F

Cyanobacteria carry out photosynthetic light-energy conversion using phycobiliproteins for light harvesting and the chlorophyll-rich photosystems for photochemistry. While most cyanobacteria only absorb visible photons, some of them can acclimate to harvest far-red light (FRL, 700-800 nm) by integrating chlorophyll f and d in their photosystems and producing red-shifted allophycocyanin. Chlorophyll f insertion enables the photosystems to use FRL but slows down charge separation, reducing photosynthetic efficiency. Here we demonstrate with time-resolved fluorescence spectroscopy that charge separation in chlorophyll-f-containing Photosystem II becomes faster in the presence of red-shifted allophycocyanin antennas. This is different from all known photosynthetic systems, where additional light-harvesting complexes slow down charge separation. Based on the available structural information, we propose a model for the connectivity between the phycobiliproteins and Photosystem II that qualitatively accounts for our spectroscopic data. This unique design is probably important for these cyanobacteria to efficiently switch between visible and far-red light.

A quantum cascade laser setup for studying irreversible photoreactions in H2O with nanosecond resolution and microlitre consumption

2020 ◽  
Vol 22 (45) ◽  
pp. 26459-26467
Author(s):  
Jessica L. Klocke ◽  
Tilman Kottke
Keyword(s):  
Infrared Spectroscopy ◽  
Quantum Cascade Laser ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Time Resolved Infrared Spectroscopy ◽  
Laser Setup

Flavin photoreduction in H2O is elucidated by developing a quantum cascade laser setup for time-resolved infrared spectroscopy on irreversible reactions.

Water Transport in Proton Exchange Membranes: Insights from Time-Resolved Infrared Spectroscopy

2019 ◽  
Vol 33 (1) ◽  
pp. 1029-1033 ◽  
Author(s):  
Daniel Hallinan ◽  
Maria Grazia De Angelis ◽  
Marco Giacinti Baschetti ◽  
Giulio Sarti ◽  
Yossef A. Elabd
Keyword(s):  
Infrared Spectroscopy ◽  
Water Transport ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Probing the Contributions to DNA Hybridization Dynamics with Time-Resolved Infrared Spectroscopy

2021 ◽  
Vol 120 (3) ◽  
pp. 8a-9a
Author(s):  
Brennan Ashwood ◽  
Paul J. Sanstead ◽  
Qing Dai ◽  
Chuan He ◽  
Andrei Tokmakoff
Keyword(s):  
Infrared Spectroscopy ◽  
Dna Hybridization ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Conformational Changes Generated in GroEL during ATP Hydrolysis as Seen by Time-resolved Infrared Spectroscopy

1999 ◽  
Vol 274 (9) ◽  
pp. 5508-5513 ◽  
Author(s):  
Frithjof von Germar ◽  
Asier Galán ◽  
Oscar Llorca ◽  
Jose L. Carrascosa ◽  
Jose M. Valpuesta ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Conformational Changes ◽  
Atp Hydrolysis ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Photochemical Release of ATP from "Caged ATP" Studied by Time-Resolved Infrared Spectroscopy

1995 ◽  
Vol 117 (41) ◽  
pp. 10311-10316 ◽  
Author(s):  
Andreas Barth ◽  
Karin Hauser ◽  
Werner Maentele ◽  
John E. T. Corrie ◽  
David R. Trentham
Keyword(s):  
Infrared Spectroscopy ◽  
Time Resolved ◽  
Caged Atp ◽  
Time Resolved Infrared Spectroscopy
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