Jennifer Glass has a new publication in Limnology & Oceanography entitled "Molybdenum-nitrogen colimitation in freshwater and coastal heterocystous cyanobacteria", coauthored with Anbar alum Felisa Wolfe-Simon, collaborator Jim Elser and Ariel Anbar. This work experimentally evaluates the sensitivity of several species of cyanobacteria to molybdenum and nitrogen limitation. Molybdenum (Mo) is a metal critical for nitrogen fixation, and the requirements for freshwater and salt water organisms might be expected to vary due to the more than five-fold Mo concentration decrease in freshwater compared to the ocean. Contrary to expectation, cyanobacteria from both environments were able to continue fixing nitrogen for more than a month even under low Mo conditions. Details of the rates of nitrogen fixation and chlorophyll content suggest that freshwater cyanobacteria were more robust in Mo-limited conditions due to gene expression of the Mo-storage protein mop.