Bacterial utilization of a hydrazine derivative as nitrogen source for growth

The ability of microbes to metabolize the N--N bond seems rare. Pseudomonas sp. from soil can utilize 1,4,5,6-tetrahydro-6-oxo-3-pyridazinecarboxylic acid as C and N source. This appears to be the first report that a microbe can cleave a nitrogen--nitrogen bond in an organic compound and use the products for growth.