Exact helical polymer synthesis by directionally fixed connection of a C2-chiral 9,9′-spirobifluorene unit with a C2- or Cs-symmetric unit

2013 ◽  
Vol 49 (48) ◽  
pp. 5486 ◽  
Author(s):  
Ryota Seto ◽  
Yasuhito Koyama ◽  
Kun Xu ◽  
Susumu Kawauchi ◽  
Toshikazu Takata
Keyword(s):  
Polymer Synthesis ◽  
Helical Polymer

scholarly journals Effects on Circular Dicroism of pyridil-oxazolinic monomers: preparatory studies on the helical polymer synthesis

2013 ◽  
Author(s):  
George H. Sakae ◽  
Rafaela C. Carmona ◽  
Edison P. Wendler ◽  
Alcindo A. Dos Santos
Keyword(s):  
Polymer Synthesis ◽  
Helical Polymer

Exact helical polymer synthesis by a two-point-covalent-linking protocol between C2-chiral spirobifluorene and C2- or Cs-symmetric anthraquinone monomers

2015 ◽  
Vol 51 (52) ◽  
pp. 10423-10426 ◽  
Author(s):  
Zhaozhong Yi ◽  
Hitoshi Okuda ◽  
Yasuhito Koyama ◽  
Ryota Seto ◽  
Satoshi Uchida ◽  
...  
Keyword(s):  
Polymer Synthesis ◽  
Helical Polymers ◽  
Helical Polymer

Two types of one-handed exact helical polymers, coil- and screw-shaped polymers, were selectively synthesized by a two-point-covalent-linking protocol.

Direct formation of the helical polymer conformation in stereospecific polymer synthesis: x-ray crystallographic determination of linear chloral oligomers

1989 ◽  
Vol 22 (12) ◽  
pp. 4658-4660 ◽  
Author(s):  
Otto Vogl ◽  
Fu Xi ◽  
Frantisek Vass ◽  
Koichi Ute ◽  
Tohru Nishimura ◽  
...  
Keyword(s):  
Polymer Synthesis ◽  
Polymer Conformation ◽  
X Ray ◽  
Helical Polymer ◽  
Direct Formation

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 and Self-assembly of Amphiphilic Precision Glycomacromolecules

2021 ◽  
Author(s):  
Alexander Banger ◽  
Julian Sindram ◽  
Marius Otten ◽  
Jessica Kania ◽  
Alexander Strzelczyk ◽  
...  
Keyword(s):  
Self Assembly ◽  
Solid Phase ◽  
Building Blocks ◽  
Polymer Synthesis

We present the synthesis of so called amphiphilic glycomacromolecules (APGs) by using solid-phase polymer synthesis. Based on tailor made building blocks, monosdisperse APGs with varying compositions are synthesized, introducing carbohydrate...

Sign in / Sign up

Export Citation Format

Share Document