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. 2016 Feb 3;7:59. doi: 10.3389/fmicb.2016.00059

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Copyright © 2016 Harvey, Deering, Rowley, El Gamal, Schorn, Moore, Johnson, Mincer and Whalen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Growth rates (μ d^-1) of Emiliania huxleyi (strain 624, either xenic or axenic) were measured in response to (A) live Pseudoalteromonas piscicida cells and filtrate. Growth rates (μ d^-1) of axenic E. huxleyi (strain 624) were measured in response to (B) crude extracts of P. piscicida secreted metabolites and appropriate media (F/2 and TSY) and solvent (DMSO) controls. Compared to the control, the growth rate of E. huxleyi significantly decreased in response to high concentrations (10⁶ cells mL^-1) of P. piscicida and the crude extracts. Additionally, high concentrations of culture filtrate and low concentrations (10³ cells mL^-1) of P. piscicida resulted in a significant decrease in E. huxleyi growth but only in the xenic subculture. Significance is denoted as being less than 0.05 (^∗), less than 0.01 (^∗∗), or less than 0.001 (^∗∗∗). For all treatments, n = 3. All error bars are one standard deviation of the mean.