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Structural study of Bombyx mori silk...

Ha, Sung-Won.

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Structural study of Bombyx mori silk fibroin during processing for regeneration.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structural study of Bombyx mori silk fibroin during processing for regeneration./
Author:	Ha, Sung-Won.
Description:	192 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0302.
Contained By:	Dissertation Abstracts International66-01B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3162442
ISBN:	0496961233

Structural study of Bombyx mori silk fibroin during processing for regeneration.
Ha, Sung-Won.

Structural study of Bombyx mori silk fibroin during processing for regeneration. - 192 p.

Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0302.

Thesis (Ph.D.)--North Carolina State University, 2005.

Bombyx mori silk fibroin has excellent mechanical properties combined with flexibility, tissue compatibility, and high oxygen permeability in the wet condition. This important material should be dissolved and regenerated to be utilized as useful forms such as gel, film, fiber, powder, or non-woven. However, it has long been a problem that the regenerated fibroin materials show poor mechanical properties and brittleness. These problems were technically solved by improving a fiber processing method reported here. The regenerated fibroin fibers showed much better mechanical properties compared to the original silk fibers. This improved technique for the fiber processing of Bombyx mori silk fibroin may be used as a model system for other semi-crystalline fiber forming proteins, becoming available through biotechnology. The physical and chemical properties of the regenerated fibers were characterized by SinTechRTM tensile testing, X-ray diffraction, solid state 13C NMR spectroscopy, and SEM.

ISBN: 0496961233Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Structural study of Bombyx mori silk fibroin during processing for regeneration.
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245 1 0 $a Structural study of Bombyx mori silk fibroin during processing for regeneration.
300 $a 192 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0302.
500 $a Director: Samuel M. Hudson.
502 $a Thesis (Ph.D.)--North Carolina State University, 2005.
520 $a Bombyx mori silk fibroin has excellent mechanical properties combined with flexibility, tissue compatibility, and high oxygen permeability in the wet condition. This important material should be dissolved and regenerated to be utilized as useful forms such as gel, film, fiber, powder, or non-woven. However, it has long been a problem that the regenerated fibroin materials show poor mechanical properties and brittleness. These problems were technically solved by improving a fiber processing method reported here. The regenerated fibroin fibers showed much better mechanical properties compared to the original silk fibers. This improved technique for the fiber processing of Bombyx mori silk fibroin may be used as a model system for other semi-crystalline fiber forming proteins, becoming available through biotechnology. The physical and chemical properties of the regenerated fibers were characterized by SinTechRTM tensile testing, X-ray diffraction, solid state 13C NMR spectroscopy, and SEM.
520 $a Unlike synthetic polymers, the molecular weight distribution of Bombyx mori silk fibroin is mono-disperse because silk fibroin is synthesized from DNA template. Genetic studies have revealed the entire amino acid sequence of Bombyx mori silk fibroin. It is known that the crystalline silk II structure is composed of hexa-amino acid sequences, GAGAGS. However, in the amino acid sequence of Bombyx mori silk fibroin heavy chain, there are present 11 chemically irregular but evolutionarily conserved sequences with about 31 amino acid residues (irregular GT&sim;GT sequences). The structure and role of these irregular sequences have remained unknown. One of the most frequently appearing irregular sequences was synthesized by a peptide synthesizer. The three-dimensional structure of this irregular silk peptide was studied by the high resolution two-dimensional NMR technique. The three-dimensional structure of this peptide shows that it makes a turn or loop structure (distorted O shape), which means the proceeding backbone direction is changed 180° by this sequence. This may facilitate the beta-sheet formation of the crystal forming building blocks, GAGAGS/GY&sim;GY sequences, in fibroin heavy chain. It may also facilitate the solubilization of the fibroin heavy chain within the silk gland.
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650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Textile Technology. $3 1020710
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710 2 0 $a North Carolina State University. $3 1018772
773 0 $t Dissertation Abstracts International $g 66-01B.
790 1 0 $a Hudson, Samuel M., $e advisor
790 $a 0155
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3162442