A. Growth curves of Halobacterium NRC-1 at elevated temperatures 42 (squares), 46 (triangles), 48 (cross), 49 (asterisks), 50 (dark circles), 52 (diamonds), and 56 °C. (open circles). B. Survival of Halobacterium NRC-1 at sublethal (49 °C- triangles), Pretreatment of cells at 49 °C for 1 hour, then shifted at 56 °C (cross), and directly at lethal (56 °C- open circles) temperature. Control was grown at 42 °C (dark squares).