High CO2 and Silicate Limitation Synergistically Increase the Toxicity of Pseudo-nitzschia fraudulenta Tatters, Avery O. ; Fu, Fei-Xue ; Hutchins, David A. Abstract Publication: PLoS ONE Pub Date: February 2012 DOI: 10.1371/journal.pone.0032116 Bibcode: 2012PLoSO...732116T