Intrachain conduction and main-chain conformation of conducting polymers as studied by frequency-domain electric birefringence spectroscopy

1994 ◽  
Vol 72 (13) ◽  
pp. 2073-2076 ◽  
Author(s):  
Takeshi Shimomura ◽  
Haruhiko Sato ◽  
Hiroshi Furusawa ◽  
Yasuyuki Kimura ◽  
Hajime Okumoto ◽  
...  
Keyword(s):  
Conducting Polymers ◽  
Frequency Domain ◽  
Main Chain ◽  
Chain Conformation ◽  
Electric Birefringence

Frequency-domain electric birefringence spectra of conducting polymers

1995 ◽  
Vol 69 (1-3) ◽  
pp. 689-690 ◽  
Author(s):  
T. Shimomura ◽  
Y. Kimura ◽  
K. Ito ◽  
R. Hayakawa ◽  
S. Hotta
Keyword(s):  
Conducting Polymers ◽  
Frequency Domain ◽  
Electric Birefringence

Study of the effect of aggregation on the structure of syndiotactic poly(methyl methacrylate) by infrared spectra of its deuterated analogues

1984 ◽  
Vol 49 (10) ◽  
pp. 2259-2268 ◽  
Author(s):  
Jiří Dybal ◽  
Bohdan Schneider ◽  
Marian Mihailov
Keyword(s):  
Methyl Methacrylate ◽  
Infrared Spectra ◽  
Main Chain ◽  
Chain Conformation ◽  
Conformational Structure ◽  
Poly Methyl Methacrylate ◽  
Carbon Backbone ◽  
Temperature Trends ◽  
Extended Chain ◽  
Vibrational Bands

The temperature trends of the infrared spectra of the films of some specifically deuterated analogues of syndiotactic poly(methyl methacrylate) were measured and vibrational bands sensitive to the conformational structure of the carbon backbone and to the orientation of ester groups with respect to the main chain were determined. Analysis of the spectra has confirmed that aggregated syndiotactic poly(methyl methacrylate) contains a higher population of diads in the extended chain conformation in long syndiotactic sequences as compared to the nonaggregated polymer, and has shown that in the aggregate, ordering of ester groups also takes place.

scholarly journals Mechanisms of Deamidation of Asparagine Residues and Effects of Main-Chain Conformation on Activation Energy

2020 ◽  
Vol 21 (19) ◽  
pp. 7035
Author(s):  
Koichi Kato ◽  
Tomoki Nakayoshi ◽  
Eiji Kurimoto ◽  
Akifumi Oda
Keyword(s):  
Activation Energy ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Density Functional ◽  
Main Chain ◽  
Density Functional Method ◽  
Md Simulations ◽  
Chain Conformation ◽  
Dihydrogen Phosphate ◽  
Chain Conformations

Deamidation of asparagine (Asn) residues is a nonenzymatic post-translational modification of proteins. Asn deamidation is associated with pathogenesis of age-related diseases and hypofunction of monoclonal antibodies. Deamidation rate is known to be affected by the residue following Asn on the carboxyl side and by secondary structure. Information about main-chain conformation of Asn residues is necessary to accurately predict deamidation rate. In this study, the effect of main-chain conformation of Asn residues on deamidation rate was computationally investigated using molecular dynamics (MD) simulations and quantum chemical calculations. The results of MD simulations for γS-crystallin suggested that frequently deamidated Asn residues have common main-chain conformations on the N-terminal side. Based on the simulated structure, initial structures for the quantum chemical calculations were constructed and optimized geometries were obtained using the B3LYP density functional method. Structures that were frequently deamidated had a lower activation energy barrier than that of the little deamidated structure. We also showed that dihydrogen phosphate and bicarbonate ions are important catalysts for deamidation of Asn residues.

Study of the chain conformation of thermotropic nematic main chain polyesters

1994 ◽  
Vol 4 (10) ◽  
pp. 1843-1863 ◽  
Author(s):  
M. H. Li ◽  
A. Brûlet ◽  
J. P. Cotton ◽  
P. Davidson ◽  
C. Strazielle ◽  
...  
Keyword(s):  
Main Chain ◽  
Chain Conformation
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