Pulsed EPR/ENDOR Characterization of the Cu2+Surface Site in Photosynthetic Bacterial Reaction Centers

2004 ◽  
Vol 108 (30) ◽  
pp. 11150-11156 ◽  
Author(s):  
L. M. Utschig ◽  
A. V. Astashkin ◽  
A. M. Raitsimring ◽  
M. C. Thurnauer ◽  
O. G. Poluektov
Keyword(s):  
Reaction Centers ◽  
Surface Site ◽  
Pulsed Epr ◽  
Bacterial Reaction Centers

scholarly journals Nanostructured interfaces between photosynthetic bacterial Reaction Center and Silicon electrodes

MRS Advances ◽  
2019 ◽  
Vol 4 (31-32) ◽  
pp. 1741-1748 ◽  
Author(s):  
Marco Lo Presti ◽  
Danilo Vona ◽  
Gabriella Leone ◽  
Giorgio Rizzo ◽  
Roberta Ragni ◽  
...  
Keyword(s):  
Silicon Film ◽  
Reaction Centers ◽  
Electrode Surfaces ◽  
Bacterial Reaction Centers ◽  
Diatomaceous Silica ◽  
Quaternary Structures ◽  
Silicon Based ◽  
New Generation ◽  
Nanostructured Interfaces

ABSTRACT:Optimizing interfaces between photosynthetic natural photoconverters, like photosynthetic bacterial Reaction Centers (RCs) and electrode surfaces represents a challenge in the progress of bio-optoelectronic devices. The features of the surfaces may result detrimental for the tertiary and quaternary structures of the RC, even resulting in the denaturation of the enzyme. Functional surfaces possessing both confinement capability and conductive features able to preserve the conformation of the biomolecule and its bioelectronic behaviours are highly needed. In this work, the RC is adsorbed on diatomaceous silica and plasma treated hydrophobic silicon based materials. Both the materials are demonstrated to be able to preserve and enhance the RC photoconverting activity. In particular, we evaluate the functioning of isolated bacterial RC interacting with flat pSi electrode through two nanotextured interfaces designed to address the RC: a thin conductive silicon film nanotextured in pillars via plasma treatment, and a cast film of nanostructured dielectric biosilica obtained from diatomaceous earth. The characterization of these interfaces, together with the RC photocurrent production measurements, pave the way to new generation RC based bio-devices for photocurrent investigation.

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