Carol Chiu ’17


Chemical and Biological Engineering

Project Title

The Role of Alternative Nitogenase Usage in Environmental N2 Fixation

For summer 2015, I researched in the Morel lab on the benefits of the alternative nitrogenases over the Mo nitrogenase in a purple nonsulfur bacterium called Rhodopseudomonas palustris. Nitrogenase is the enzyme used for nitrogen fixation. R. palustris is special in that it can express three types of nitrogenase, Mo, V, and Fe. I discovered that the alternative nitrogenases grow better than the Mo nitrogenase in more reduced environments. The theory is that the alternative nitrogenases are better at getting rid of excess electrons during nitrogen fixation.

Internship Year


Project Category

Biodiversity and Conservation


Morel Laboratory, Geosciences Department, Princeton University, Princeton, NJ


François Morel, Professor, Geosciences