Amylases (EC3.2.1) are enzymes which hydrolyze starch and at present are classified into the three groups based on their action modes and the end product from starch degradation. They are α-amylases (EC3.2.1.1), β-amylases ...Thesis (Ph. D. in Agriculture)--University of Tsukuba, (A), no. 2547, 2001.3.23Includes bibliographical referencesTitlepage,Contents,Abbreviations -- General Introduction -- Chapter 1. Purification,Crystallization and Preliminary Crystallographic Study of αAmylase from Bacillus Stearothermophilus -- Chaprer 2. Crystal Structure of Bacillus Stearothermophilus α-Amylase : Possible Factors Determining the Termostability -- Acknowledgements -- Refereces -- Appendix,Schemas,Tables,Figure