THE EFFECT OF X-RAYS ON THE SURVIVAL OF BACTERIA AND YEAST .1. A COMPARATIVE STUDY OF THE DOSE-SURVIVAL CURVES OF AZOTOBACTER-AGILE, ESCHERICHIA-COLI, PSEUDOMONAS-FLUORESCENS, RHODOPSEUDOMONAS-SPHEROIDES, AND SACCHAROMYCES-CEREVISIAE IRRADIATED IN THE RESTING STATE