Table of Contents
ISRN Materials Science
Volume 2011, Article ID 857432, 5 pages
Research Article

Crystal Structure of Locally Available Tassar Fibers Based on [ A l a - G l y ] 𝑛 Amino Acid Sequence: Using X-Ray Data and LALS Method

Department of Studies in Physics, University of Mysore, Manasagangotri, Mysore 570006, India

Received 12 April 2011; Accepted 9 May 2011

Academic Editors: M. Celino, Y. X. Gan, and Y. Sun

Copyright © 2011 Parameswara Puttanna and Somashekar Rudrappa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


X-ray diffraction pattern from locally available Tassar fibers was recorded using imaging plate system (Dip-100S). The pattern was used along with fiber processing software to identify the reflections and to compute X-ray intensities. A molecular model was first constructed with standard bond lengths and angles using helical symmetry and layer-line spacing observed in the X-ray pattern. The model was then refined against observed X-ray data using linked-atom least-squares (LALS) method. The crystal and molecular structure of Tassar fibers is reported. It is concluded that the sheet structures formed by hydrogen bonds assume the antipolar-antiparallel arrangement.