Limnology and Oceanography, Vol. 55, No. 3 (May 2010), pp. 1064-1074 (11 pages) We elucidate the controls on the δ¹ɸO values of microbially produced nitrate by tracking the δ¹ɸO of nitrite and nitrate ...

Sometimes, less really is more. By removing oxygen during synthesis, a team led by materials scientists at Penn State created ...

The energy oxygen requirement is one of the key parameters to characterize quantitatively the biological oxidation process for waste treatment. It is defined that the net consumption of oxygen other ...

It may have been unexpectedly easy for the air to become rich in oxygen. A new simulation of the rise of oxygen suggests that it was driven by the planet itself, and needed little help from living ...