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ambient acidity
Temperature, osmolarity, ferrous iron ion concentration, nutrition availability, the quality of materials used to make biofilms, light, and ________ are all environmental factors that impact pellicles formation.
Aseptic procedures
________ are used in laboratories to limit the entry of pollutants or germs into the solution.
pellicle
A(n) ________ is a thin transparent bacterial membrane that forms on the surface of the broth when it comes into contact with air, reducing contamination and allowing the bacteria to inhabit a healthy biological niche.