Biology Reference
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3.2.7 Statistical analyses
Correlation between attachment efficiency and sphericity, motility, and zeta potential were
determined with Pearson correlation. Correlation between attachment efficiency and cell-
aggregation was determined using the Spearman rank correlation test. Correlation between
attachment efficiencies, saccharides and genes were determined using Fisher's exact test, and
correlation between cell aggregation and the presence of the flu gene was determined using the
Kruskal-Wallis test. Most of the tests were carried out in Systat (SPSS Inc. Chicago, Il), except
for Fisher's test ( www.socr.ucla.edu ).
3.3 Results
3.3.1 Breakthrough curves
In general, breakthrough was rapid and started to increase within one pore volume (data not
shown). Not all curves started to breakthrough at exactly the same (dimensionless) moment. This
was possibly due to an equilibrium sorption component, which caused minor horizontal
translations of the breakthrough curves. In all cases, after the bacteria were flushed, relative
concentrations rapidly fell to values below the detection limit of the spectrophotometer.
2.5
2.0
1.5
1.0
0.5
0.0
1.E-03
1.E-02
1.E-01
1.E+00
Max C/C 0 (-)
Fig. 3.1:
Relation between maximum recorded breakthrough and attachment efficiency for
the 54 E. coli strains used in this study .
 
 
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