Huie, J. L.. Princeton University, huiejl@geo.princeton.edu
Morel, F. L.. Princeton University, morel@geo.princeton.edu

 
COBALT USE BY MARINE SYNECHOCOCCUS
 
Synechococcus are abundant in the open ocean and may be responsible for up to 20% of oceanic primary productivity. Growth limitation of these picoplankton by trace metal availability in oligotrophic regions of the ocean is of particular interest. Similar to other marine Synechococcus, strain WH7803 requires cobalt for maximal growth. Zinc is required at a lower amount and does not enhance growth to the level achieved by Co addition. 57Co labeling experiments indicate that a factor in particulate matter of cell extracts contains Co. 57Co labeling is greatly enhanced by growth at low PCO2, indicating a possible link to use of bicarbonate as primary carbon source. We also see 65Zn labeling in the particulate fraction of cell extracts, but to a much lesser extent and with no obvious dependence upon PCO2 level. We are presently investigating the nature of Co use by WH7803 at different PCO2 levels.
 
Day: Thursday, Feb. 4
Time: 04:00 - 04:15pm
Location: Sweeney Center
 
Code: SS28TH0400S