I of 5%) and between the membrane types (2-tailed paired t test,

I. of 5%) and between the membrane types (2-tailed paired t test, C.I. of 5% or repeated-measures ANOVA, C.I. of 5%). Counts obtained from the individual fields of each slide were RG7112 first evaluated using the Shapiro-Wilks test. Data sets that failed the Shapiro-Wilks test (having p-values < 0.05) were transformed using the Box-Cox transformation. The resulting transformed variables were consistent with a normal distribution. Mauchly's test of sphericity was performed and if the test was found to be significant

(having p-values < 0.05) either the Huynh-Feldt (for epsilon values > 0.75) or the Greenhouse-Geisser (for epsilon values < 0.75) correction was applied. Acknowledgements This work was funded by the National Science Foundation (OCE-0550485 to AB and OCE-0825405 and OCE-0851113 to SWW). The authors would like to thank J. Dunlap for assistance with SEM. References 1. Brussaard CPD, Wilhelm SW, Thingstad F, Weinbauer MG, Bratbak G, Heldal M, Kimmance SA, Middelboe M, Nagasaki K, Paul JH, et al.: Global-scale

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