Inside Front Cover: A Photosynthetic Reaction Center Covalently Bound to Carbon Nanotubes (Adv. Mater. 22/2007)

2007 ◽  
Vol 19 (22) ◽  
pp. NA-NA
Author(s):  
I. Carmeli ◽  
M. Mangold ◽  
L. Frolov ◽  
B. Zebli ◽  
C. Carmeli ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Reaction Center ◽  
Photosynthetic Reaction Center ◽  
Front Cover ◽  
Covalently Bound

A Photosynthetic Reaction Center Covalently Bound to Carbon Nanotubes

2007 ◽  
Vol 19 (22) ◽  
pp. 3901-3905 ◽  
Author(s):  
I. Carmeli ◽  
M. Mangold ◽  
L. Frolov ◽  
B. Zebli ◽  
C. Carmeli ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Reaction Center ◽  
Photosynthetic Reaction Center ◽  
Covalently Bound

Computational Investigation of the Asymmetry in Photosynthetic Reaction Center Models from First Principles

2020 ◽  
Author(s):  
Denis Artiukhin ◽  
Patrick Eschenbach ◽  
Johannes Neugebauer
Keyword(s):  
Spin Density ◽  
Reaction Center ◽  
Density Functional ◽  
Photosynthetic Reaction Center ◽  
Chem Phys ◽  
Molecular Structures ◽  
Error Characteristic ◽  
Molecular Systems ◽  
Density Distributions ◽  
The Asymmetry

We present a computational analysis of the asymmetry in reaction center models of photosystem I, photosystem II, and bacteria from <i>Synechococcus elongatus</i>, <i>Thermococcus vulcanus</i>, and <i>Rhodobacter sphaeroides</i>, respectively. The recently developed FDE-diab methodology [J. Chem. Phys., 148 (2018), 214104] allowed us to effectively avoid the spin-density overdelocalization error characteristic for standard Kohn–Sham Density Functional Theory and to reliably calculate spin-density distributions and electronic couplings for a number of molecular systems ranging from dimeric models in vacuum to large protein including up to about 2000 atoms. The calculated spin densities showed a good agreement with available experimental results and were used to validate reaction center models reported in the literature. We demonstrated that the applied theoretical approach is very sensitive to changes in molecular structures and relative orientation of molecules. This makes FDE-diab a valuable tool for electronic structure calculations of large photosynthetic models effectively complementing the existing experimental techniques.

scholarly journals A Facile and Efficient Bromination of Multi-Walled Carbon Nanotubes

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3161
Author(s):  
Sandra Zarska ◽  
Damian Kulawik ◽  
Volodymyr Pavlyuk ◽  
Piotr Tomasik ◽  
Alicja Bachmatiuk ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Covalent Attachment ◽  
Closed Vessel ◽  
Dangling Bonds ◽  
Magnetic Stirrer ◽  
Defect Sites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Covalently Bound

The bromination of multi-walled carbon nanotubes (MWCNT) was performed with vapor bromine in a closed vessel, and they were subjected to intensive stirring with a magnetic stirrer for up to 14 days. The efficiency of bromination was compared depending upon duration. The structure and surface of the crude and purified products were characterized by detailed physicochemical analyses, such as SEM/EDS, TEM, XRD, TGA, Raman, and XPS spectroscopies. The studies confirmed the presence of bromine covalently bound with nanotubes as well as the formation of inclusion MWCNT–Br2 complexes. It was confirmed that Br2 molecules are absorbed on the surface of nanotubes (forming the CNT-Br2 complex), while they can dissociate close to dangling bonds at CNT defect sites with the formation of covalent C−Br bonds. Thus, any covalent attachment of bromine to the graphitic surface achieved around room temperature is likely related to the defects in the MWCNTs. The best results, i.e., the highest amount of attached Br2, were obtained for brominated nanotubes brominated for 10 days, with the content of covalently bound bromine being 0.68 at% (by XPS).

A Comparison of Stigmatellin Conformations, Free and Bound to the Photosynthetic Reaction Center and the Cytochrome bc1 Complex

2007 ◽  
Vol 368 (1) ◽  
pp. 197-208 ◽  
Author(s):  
C. Roy D. Lancaster ◽  
Carola Hunte ◽  
Jack Kelley ◽  
Bernard L. Trumpower ◽  
Robert Ditchfield
Keyword(s):  
Reaction Center ◽  
Photosynthetic Reaction Center ◽  
Cytochrome Bc1 ◽  
Bc1 Complex ◽  
Cytochrome Bc1 Complex

scholarly journals A unique photosynthetic reaction center from Heliobacterium chlorum

FEBS Letters ◽  
1985 ◽  
Vol 182 (2) ◽  
pp. 345-349 ◽  
Author(s):  
R.Clinton Fuller ◽  
Sallie G. Sprague ◽  
Howard Gest ◽  
Robert E. Blankenship
Keyword(s):  
Reaction Center ◽  
Photosynthetic Reaction Center ◽  
Heliobacterium Chlorum
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