The Inheritance of Environmentally Induced Characters in Bacteria

Water Relations of Salmonellae At 30°C

“…It is of some interest to compare the limiting aw of c. 0.945 in the present experiments with the approximate aw's which may be deduced from the limiting conditions reported by other workers. Severens and Tanner (1945) found no growth of unadapted salmonellae above 3 per cent. NaCI, but after adaptation growth occurred in up to 8 per cent.…”

“…The results reported in this paper have been obtained with unadapted cultures and no attempt has been made to determine whether salmonellae could be adapted or selected to grow at even lower aw's. Although Severens and Tanner (1945) reported that salmonellae acquired permanently increased tolerance to NaCI as a result of selection, the maximum concentration of salt tolerated after adaptation was 8 per cent. (aw 0.95).…”

“…Similar studies do not appear to have been made previously, although some authors have studied the inhibition of growth by solutes such as sodium chloride. Severens and Tanner (1945) reported that 3 per cent. NaCl was the highest concentration permitting growth of unadapted strains of S.…”

Adaptation by Tetrahymena pyriformis to Potassium Cyanide II. Adaptation Against Respiratory Inhibition*

“…Cells in fresh culture medium and in contact with K C S for 1 hour before test. V. Fresh culture medium contained 2 X M KCN for [8][9][10] hours, then cells added to give 1 O P M KCN and usual cell density. VI.…”

Chemically Induced Mutations and Their Bearing on Carcinogenesis

“…Certain color mutants of Drosophila also vary in their resistance to thiourea (Goldsmith and Harnly, 1946). Mutation in microorganisms leads to increased resistance to bacterial viruses (Luria, 1947;Demerec and Latarjet, 1947), to heavy metal salts (Severens and Tanner, 1945), and to penicillin (Demerec, 1945).…”