Helena van Tol

Graduate student

Benjamin Hall IRB 323

M.Sc. Oceanography. University of Washington, Seattle, WA, 2015.
B.Sc. Environmental Science (Hon.), Biology minor. Mount Allison University, Sackville, NB, 2011.


For my Master's project I studied interactions between the flavobacterium Croceibacter atlanticus and diatoms. C. atlanticus was isolated from the pennate chain-forming diatom Pseudo-nitzschia multiseries, and was found to inhibit growth in many different diatoms. When C. atlanticus was grown with the centric diatom Thalassiosira pseudonana, we observed large polyploid cells with multiple plastids. These features indicate that C. atlanticus may inhibit cytokinesis in diatoms.

Epifluorescence microscopy image of T. pseudonana in mono-culture (left) and in co-culture (right) with C. atlanticus. Green = SYBR-stained DNA, red = plastid autofluorescence.