Asymmetric polymerization of triphenylmethyl methacrylate leading to a one-handed helical polymer: mechanism of polymerization

1992 ◽  
Vol 114 (4) ◽  
pp. 1318-1329 ◽  
Author(s):  
Tamaki Nakano ◽  
Yoshio Okamoto ◽  
Koichi Hatada
Keyword(s):  
Helical Polymer ◽  
Asymmetric Polymerization

Micelle-provided microenvironment facilitating the formation of single-handed helical polymer-based nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59066-59072 ◽  
Author(s):  
Biao Zhao ◽  
Jianping Deng
Keyword(s):  
Helical Polymers ◽  
Helical Polymer ◽  
Synthetic Helical Polymers ◽  
Asymmetric Polymerization

Micelles provide microenvironment effects for asymmetric polymerization: an unprecedented methodology for controlling the preferential helicity of synthetic helical polymers.

Electron Microscopy and image analysis of nucleo-protein complexes

1994 ◽  
Vol 52 ◽  
pp. 88-89
Author(s):  
E. H. Egelman ◽  
X. Yu
Keyword(s):  
Electron Microscopy ◽  
Image Analysis ◽  
Normal Cell ◽  
Genetic Recombination ◽  
Protein Complexes ◽  
Chromosomal Rearrangements ◽  
Reca Protein ◽  
E Coli ◽  
Helical Polymer ◽  
Specific Protease

The RecA protein of E. coli has been shown to mediate genetic recombination, regulate its own synthesis, control the expression of other genes, act as a specific protease, form a helical polymer and have an ATPase activity, among other observed properties. The unusual filament formed by the RecA protein on DNA has not previously been shown to exist outside of bacteria. Within this filament, the 36 Å pitch of B-form DNA is extended to about 95 Å, the pitch of the RecA helix. We have now establishedthat similar nucleo-protein complexes are formed by bacteriophage and yeast proteins, and availableevidence suggests that this structure is universal across all of biology, including humans. Thus, understanding the function of the RecA protein will reveal basic mechanisms, in existence inall organisms, that are at the foundation of general genetic recombination and repair.Recombination at this moment is assuming an importance far greater than just pure biology. The association between chromosomal rearrangements and neoplasms has become stronger and stronger, and these rearrangements are most likely products of the recombinatory apparatus of the normal cell. Further, damage to DNA appears to be a major cause of cancer.

SuFExable Polymers with Helical Structures Derived from Thionyl Tetrafluoride (SOF4)

2019 ◽  
Author(s):  
Suhua Li ◽  
Gencheng Li ◽  
Bing Gao ◽  
Sidharam P. Pujari ◽  
Xiaoyan Chen ◽  
...  
Keyword(s):  
Functional Polymers ◽  
Polymer Chains ◽  
New Materials ◽  
Helical Structures ◽  
Polymer Backbone ◽  
Silyl Ethers ◽  
Helical Polymer ◽  
Key Characteristics ◽  
Post Modification ◽  
Individual Polymer

The first SuFEx click chemistry synthesis of SOF<sub>4</sub>-derived copolymers based upon the polymerization of bis(iminosulfur oxydifluorides) and bis(aryl silyl ethers) is described. This novel class of SuFEx polymer presents two key characteristics: First, the newly created [-N=S(=O)F-O-] polymer backbone linkages are themselves SuFExable and primed to undergo further high-yielding and precise SuFEx-based post-modification with phenols or amines to yield branched functional polymers. Second, studies of individual polymer chains of several of these new materials indicate the presence of helical polymer structures, which itself suggests a preferential approach of new monomers onto the growing polymer chain upon the formation of the stereogenic linking moiety.

scholarly journals Synthesis, Methanolysis, and Asymmetric Polymerization of meta- and para-substituted Triphenylmethyl Methacrylates

1987 ◽  
Vol 19 (10) ◽  
pp. 1183-1190 ◽  
Author(s):  
Yoshio Okamoto ◽  
Eiji Yashima ◽  
Motoshi Ishikura ◽  
Koichi Hatada
Keyword(s):  
Asymmetric Polymerization

scholarly journals Asymmetric Polymerization of N,N-Disubstituted Acrylamides

1989 ◽  
Vol 21 (7) ◽  
pp. 543-549 ◽  
Author(s):  
Yoshio Okamoto ◽  
Hiromi Hayashida ◽  
Koichi Hatada
Keyword(s):  
Asymmetric Polymerization
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