Mean biofilm thickness |
\({\overset{\overline{}}{L}}_{F}\) |
µm |
Biofilm height in z-direction; calculated from the bulk-biofilm
interface to the substratum with neglection of pores |
Substratum coverage |
SC |
% |
Coverage of the flow cell
bottom with biofilm; 100 % minus this parameter would result in global
porosity |
Textural entropy |
TE |
- |
Is a measure of the randomness of
the pixel intensity distribution and thus of the biofilm heterogeneity
(raising values explain more heterogeneous biofilms) |
Fractal dimension |
FD |
- |
Describes the irregularity of
the aggregates‘ surfaces; higher values equal higher surface
roughness’s |
Skewness |
\(R_{\text{SK}}\) |
- |
Determines the occurrence of low
(valleys; \(\backslash nR_{\text{SK}}\)<0) and high biofilm
colonies (hills;\(\ R_{\text{SK}}\)>0) in the biofilm
structure |
Kurtosis |
\(R_{\text{KU}}\) |
- |
Defines the distribution of these
occurred valleys and hills on the biofilms’ surface |
Average second moment |
ASM |
- |
Direction orientated
indicator of the cell clusters (higher values describe dimensional
uniformity; lower values define a change in growth direction (x, y) of
the biofilm aggregates) |
Inverse difference moment |
IDM |
- |
Similar to ASM but
distance orientated (lower values indicate that distances between
biofilm aggregates decrease) |
Average vertical run length |
AVRL |
µm |
Mean colony width
in y-direction; calculated from separated biofilm aggregates in the flow
channel |
Average horizontal run length |
AHRL |
µm |
Mean colony
length in x-direction; calculated from separated biofilm aggregates in
the flow channel |