Oxygen isotope fractionation during respiration for different temperatures ofT. utilis andE. coli K12

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Abstract
Summary The temperature dependence of the oxygen isotope fractionation factor during respiration has been examined for two different microorganisms, namelyTorulopsis utilis andEscherichia coli K12 representing a yeast and a bacterium, respectively. The investigation covered a temperature range of 18° C, that is from 16° C to 34° C forT. utilis and from 19° C to 37° C forE. coli K12. Within this temperature range the fractionation factor ofT. utilis increases by 0.18‰; an insignificant change (Δδ 10° C = 0.063‰;r = 0.067), whereas withE. coli K 12 an increase of 1.12‰; has been observed (Δδ 10° C = 0.6‰;r = 0.55).