In the above citied letter to Nature the authors concluded out of their experiments: «Here we demonstrate using stable carbon isotopes that methane is readily formed in situ in terrestrial plants under oxic conditions by a hitherto unrecognized process.» (realclimate.org)
Lenski and his student Zachary Blount note that «E. coli cells can not grow on citrate under oxic conditions, and that inability has long been viewed as a defining characteristic of this important, diverse, and widespread species.» (religion.blogs.cnn.com)
He and his colleagues did not find a statistically significant increase in the proportion of oxic to anoxic water at the boundary between the Ediacaran and the Cambrian. (scientificamerican.com)