Hardware Description The Lysogenic Bacteria Experiment Packages are designed to grow replicate 1.2 ml cultures of two strains of lysogenic bacteria (Escherichia coli and Salmonella typhimurium P-22), without radiation and irradiated at three dose levels of gamma from 85Sr. The packages are fabricated to conform to isodose lines at an appropriate distance from the point 85Sr source. The chambers are sealed with nylon machine screws and silicone O-rings.