------------------------------------------------------------------ 120 (dry) _Bacillus stearothermophilus_ 100 min ------------------------------------------------------------------ 141 _Bacillus stearothermophilus_ 12 min ------------------------------------------------------------------ 160 _Bacillus stearothermophilus_ 2 min ------------------------------------------------------------------ 166 _Bacillus stearothermophilus_ 1 min ------------------------------------------------------------------ Table VI.—_Extremes of Chemical Environmental Factors Permitting Growth or Activity_ -------------------------------------------------------- Chemical Minimum Organism factor -------------------------------------------------------- O₂ 0% HeLa cells, _Cephalobus_, anaerobic bacteria -------------------------------------------------------- O₃ (ozone) 0% -------------------------------------------------------- H₂ 0% -------------------------------------------------------- H₂O Aw 0.48 _Pleurococcus vulgaris_ ------------------------------------------ Aw 0.5 _Xenopsylla cheopis_ (prepupae) -------------------------------------------------------- H₂O₂ 0% -------------------------------------------------------- He 0% -------------------------------------------------------- CO 0% -------------------------------------------------------- CO₂ 0% -------------------------------------------------------- CH₄ 0% -------------------------------------------------------- CH₂O 0% -------------------------------------------------------- CH₃OH 0% -------------------------------------------------------- N₂ 0% -------------------------------------------------------- NO 0% -------------------------------------------------------- NO₂ 0% -------------------------------------------------------- N₂O 0% -------------------------------------------------------- Ar 0% -------------------------------------------------------- NaCl, Na₂SO₄, NaHCO₃ -------------------------------------------------------- H₂S 0% -------------------------------------------------------- H₂SO₄ 0% -------------------------------------------------------- Cu⁺⁺ -------------------------------------------------------- Zn⁺⁺ -------------------------------------------------------- pH 0 _Acontium velatum_ _Thiobacillus thioodixans_