Limnology and Oceanography, Vol. 54, No. 4 (Jul., 2009), pp. 1403-1411 (9 pages) This study investigated the bulk nitrogen isotopic composition and fractionation of marine and freshwater cyanobacteria ...

The microbes, known as blue-green algae or cyanobacteria, have two different forms of a ubiquitous enzyme that rarely appear together in the same organism. "This is one of those great examples of ...