1. Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences; Northwestern Polytechnical Univ; Xi'an Shaanxi 710072 People's Republic of China
2. Dept. of Biological and Agricultural Engineering; Univ. of California; Davis Davis CA 95616 USA
3. Healthy Processed Foods Research Unit, Western Regional Research Center; Agricultural Research Service, USDA; Albany CA 94710 USA