scholarly journals Triple Helix and Random Coil of Scleroglucan in Dilute Solution

1983 ◽  
Vol 15 (5) ◽  
pp. 389-396 ◽  
Author(s):  
Toshio Yanaki ◽  
Takashi Norisuye
Keyword(s):  
Triple Helix ◽  
Random Coil ◽  
Dilute Solution

Rodlike and Random‐Coil Behavior of Poly(n‐butyl Isocyanate) in Dilute Solution

1969 ◽  
Vol 51 (1) ◽  
pp. 406-420 ◽  
Author(s):  
Anthony J. Bur ◽  
Donald E. Roberts
Keyword(s):  
Random Coil ◽  
Dilute Solution

Reversible polypeptide hydrogels from asymmetric telechelics with temperature-dependent and Ni2+-dependent connectors

Soft Matter ◽  
2016 ◽  
Vol 12 (22) ◽  
pp. 4979-4984 ◽  
Author(s):  
Thao T. H. Pham ◽  
Jasper van der Gucht ◽  
J. Mieke Kleijn ◽  
Martien A. Cohen Stuart
Keyword(s):  
Triple Helix ◽  
Random Coil ◽  
Temperature Dependent ◽  
Self Assembling ◽  
C Terminus ◽  
N Terminus ◽  
Asymmetric Hybrid

An asymmetric (‘hybrid’) triblock polypeptide TR4H with two different, orthogonally self-assembling end blocks has been constructed by conjugating a long (37 kDa) random coil block (R4) with a triple helix former T = (Pro-Gly-Pro)9 at the N terminus, and a histidine hexamer (‘Histag’, H) at the C terminus.

Unperturbed Dimensions of Atactic Poly(phenylacetylene)

2005 ◽  
Vol 70 (11) ◽  
pp. 1787-1798 ◽  
Author(s):  
Dana Rédrová ◽  
Jan Sedláček ◽  
Majda Žigon ◽  
Jiří Vohlídal
Keyword(s):  
Molecular Weight ◽  
Random Coil ◽  
Radius Of Gyration ◽  
Dilute Solution ◽  
Chain Branching ◽  
Unperturbed Dimensions ◽  
Molecular Weight Dependence ◽  
Atactic Polystyrene ◽  
Tetrahydrofuran Solution ◽  
Insight Into

Dilute solution characteristics of atactic (ca. 30% trans) poly(phenylacetylene), PPA, were determined by using the SEC/MALS technique in order to obtain a deeper insight into discrepancy between presumed rigidity of conjugated polyvinylene molecules and their random-coil behavior in solutions resulting from earlier viscometry measurements. PPA was found to exhibit the molecular-weight dependence of the radius of gyration in tetrahydrofuran solution similar to that of atactic polystyrene (saturated analogue of PPA); also unperturbed dimensions of these polymers are almost equal. This rather surprising observation is explained as a consequence of the increased π-π attraction between highly polarizable PPA segments with well-delocalized π-electrons, which compensates the effect of stiffening of these segments due to conjugation. Possible influence of chain branching is also discussed.

scholarly journals Contractility and Conformation

1967 ◽  
Vol 50 (6) ◽  
pp. 5-27 ◽  
Author(s):  
Harold A. Scheraga
Keyword(s):  
Partition Function ◽  
Mechanical Treatment ◽  
Random Coil ◽  
Dilute Solution ◽  
Factors Affecting ◽  
Macromolecular Conformation ◽  
Counting Procedure ◽  
Coil Transition ◽  
Statistical Mechanical ◽  
Α Helix

Contractility in fibers can arise from changes of macromolecular conformation caused by changes in some thermodynamic variable such as temperature, pH, or solvent composition. Illustrations are given of contractile processes in fibers and of changes in macromolecular conformation in dilute solution. These may involve order-disorder transitions, e.g. of the type exhibited by the helix-coil transition. A statistical mechanical treatment of the helix-coil transition involves the assignment of statistical weights to various states and the proper counting of these statistical weights in the formation and evaluation of the partition function; the thermodynamic properties of the system are derivable from the partition function. The counting procedure involved in the consideration of the α-helix and random coil is described. In addition, the factors affecting the relative stabilities of various helical conformations are discussed. These considerations of macromolecular conformation provide a basis for discussing contractile mechanisms in which changes of conformation are involved.

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