Naomi Levine, a graduate student in the MIT/WHOI Joint Program, is
studying a critical but little-known process called the "bacterial
switch," by which a compound made by phytoplankton called
dimethylsulfonionpropionate (DMSP) can be broken up by bacteria in two
different ways. Each route leads to different impacts on the environment.
(Photo courtesy of Naomi Levine, Woods Hole Oceanographic Institution)