Role of Bath Fluctuations in the Double-Excitation Manifold in Shaping the 2DES of Bacterial Reaction Centers at Low Temperature

2018 ◽  
Vol 122 (4) ◽  
pp. 1348-1366 ◽  
Author(s):  
Olga Rancova ◽  
Ryszard Jankowiak ◽  
Darius Abramavicius
Keyword(s):  
Low Temperature ◽  
Reaction Centers ◽  
Double Excitation ◽  
Bacterial Reaction Centers

Pathway of Proton Transfer in Bacterial Reaction Centers: Role of Aspartate-L213 in Proton Transfers Associated with Reduction of Quinone to Dihydroquinone

Biochemistry ◽  
1994 ◽  
Vol 33 (3) ◽  
pp. 734-745 ◽  
Author(s):  
M. L. Paddock ◽  
S. H. Rongey ◽  
P. H. McPherson ◽  
A. Juth ◽  
G. Feher ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Reaction Centers ◽  
Bacterial Reaction Centers ◽  
Proton Transfers

TEMPERATURE DEPENDENCE OF THE RATE CONSTANTS OF CHARGE RECOMBINATION REACTIONS IN BACTERIAL REACTION CENTERS

2011 ◽  
Vol 25 (12n13) ◽  
pp. 1127-1132
Author(s):  
T. T. THUY ◽  
V. T. H. YEN ◽  
T. T. THAO ◽  
NGUYEN AI VIET
Keyword(s):  
Electron Transfer ◽  
Low Temperature ◽  
Rhodobacter Sphaeroides ◽  
Charge Recombination ◽  
Reaction Centers ◽  
Approximation Formula ◽  
Medium Temperature ◽  
Bacterial Reaction Centers ◽  
Electron Transfer Theory ◽  
Recombination Reactions

The bacterial reaction center couples light-induced electron transfer via a tightly bound ubiquinone ( Q A ) to a mobile ubiquinone ( Q B ). Based on the electron transfer theory by Marcus, we have investigated the rate of charge recombination reactions from Rhodopseudomonas viridis and Rhodobacter sphaeroides, by mean of finding an approximation formula. The results obtained are verified for not only at high and low temperature as the previous works but also at the medium temperature range.

scholarly journals Dissecting the Roles of Cuticular Wax in Plant Resistance to Shoot Dehydration and Low-Temperature Stress in Arabidopsis

2021 ◽  
Vol 22 (4) ◽  
pp. 1554
Author(s):  
Tawhidur Rahman ◽  
Mingxuan Shao ◽  
Shankar Pahari ◽  
Prakash Venglat ◽  
Raju Soolanayakanahally ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Low Temperature ◽  
Cold Acclimation ◽  
Water Loss ◽  
Cuticular Wax ◽  
Dehydration Stress ◽  
Wax Deposition ◽  
Cuticular Waxes ◽  
Gas Chromatography Mass Spectroscopy

Cuticular waxes are a mixture of hydrophobic very-long-chain fatty acids and their derivatives accumulated in the plant cuticle. Most studies define the role of cuticular wax largely based on reducing nonstomatal water loss. The present study investigated the role of cuticular wax in reducing both low-temperature and dehydration stress in plants using Arabidopsis thaliana mutants and transgenic genotypes altered in the formation of cuticular wax. cer3-6, a known Arabidopsis wax-deficient mutant (with distinct reduction in aldehydes, n-alkanes, secondary n-alcohols, and ketones compared to wild type (WT)), was most sensitive to water loss, while dewax, a known wax overproducer (greater alkanes and ketones compared to WT), was more resistant to dehydration compared to WT. Furthermore, cold-acclimated cer3-6 froze at warmer temperatures, while cold-acclimated dewax displayed freezing exotherms at colder temperatures compared to WT. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis identified a characteristic decrease in the accumulation of certain waxes (e.g., alkanes, alcohols) in Arabidopsis cuticles under cold acclimation, which was additionally reduced in cer3-6. Conversely, the dewax mutant showed a greater ability to accumulate waxes under cold acclimation. Fourier Transform Infrared Spectroscopy (FTIR) also supported observations in cuticular wax deposition under cold acclimation. Our data indicate cuticular alkane waxes along with alcohols and fatty acids can facilitate avoidance of both ice formation and leaf water loss under dehydration stress and are promising genetic targets of interest.

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