Biofilm Biomass Normalized Adhesion

Normalize blank-corrected crystal-violet stain OD by matched biomass OD to compare adhesion among cultures.

Description

Blank-corrected crystal-violet stain measures an assay signal associated with adhered material.

Blank-corrected crystal-violet stain measures an assay signal associated with adhered material. Dividing by a matched biomass OD can help compare cultures with different biomass, under the declared assay basis.^[1]

Normalize blank-corrected crystal-violet stain OD by matched biomass OD to compare adhesion among cultures.

When to use Biofilm Biomass Normalized Adhesion

Use this tool to normalize blank-corrected crystal-violet stain OD by matched biomass OD to compare adhesion among cultures.

Prepare the sample, count, growth or assay measurements requested by this tool. Confirm units, sampling periods and reporting bases; supply independently established comparison criteria where requested.

How to use Biofilm Biomass Normalized Adhesion and understand its results

Prepare the sample, count, growth or assay measurements requested by this tool. Confirm units, sampling periods and reporting bases; supply independently established comparison criteria where requested.
Enter stainOds, blankOd, planktonicBiomassOds using the field table and calculation rules, then run the tool.
Read correctedStainOds, adhesionIndexes. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
stainOds	Stain ods	list of number	Required
blankOd	Blank od	number; minimum: 0	Required
planktonicBiomassOds	Planktonic biomass ods	list of number	Required

Enter aligned nonempty nonnegative stain ODs and positive biomass ODs with nonnegative blank OD. The tool clips negative blank-corrected stain to zero and returns corrected ODs plus aligned dimensionless ratios. No further background correction is applied to the biomass denominator.

Paired lists must be nonempty and have equal lengths.

correctedStain=max(0,stain−blank); adhesionIndex=correctedStain/biomassOD

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
correctedStainOds	Corrected stain ods	list of number
adhesionIndexes	Adhesion indexes	list of number

json

{
  "input": {
    "stainOds": [
      0.5,
      0.9
    ],
    "blankOd": 0.1,
    "planktonicBiomassOds": [
      0.2,
      0.4
    ]
  },
  "output": {
    "correctedStainOds": [
      0.4,
      0.8
    ],
    "adhesionIndexes": [
      2,
      2
    ]
  }
}

Limitations and assumptions

This is a normalization, not a direct viable-cell count or universal adhesion probability. Assay linearity, stain specificity and matched biomass measurements must be established independently.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Control Derived Biofilm Bands: Classify crystal-violet biofilm OD using a supplied control-SD cutoff and conventional 1×/2×/4× bands; these are assay bands, not clinical severity. For a complementary task, use Batch Biomass Productivity: Compute net biomass production and volumetric productivity in a constant-volume batch culture.

References

Biofilm Biomass Normalized Adhesion — tool.io

Similar or alternative tools

Control Derived Biofilm Bands
Classify crystal-violet biofilm OD using a supplied control-SD cutoff and conventional 1×/2×/4× bands; these are assay bands, not clinical severity.
Batch Biomass Productivity
Compute net biomass production and volumetric productivity in a constant-volume batch culture.