AGAR AS A FILM BASE. MILK AS AN EMULSION ON TOP OF THE FILM BASE AND THEN BACTERIA GROWN ON TOP OF THE MILK EMULSION AS A BIO-FILM
The example images below mix and question what is a film base and what is an emulsion?
In the images below there are four layers: 1. The plastic base of the petri dish 2. The potato-dextrose agar (emulsion) that sits on the plastic (film) base of the petri dish 3. The milk (emulsion) that sits on the potato-dextrose agar (gelatine) 4. The bacterial bio-film that grows (as a film) on the milk (emulsion).
Each of the four layers consists of a polymer based material. Being a polymer material each layer shows similarities and differences to the other layers.
Materials Initially Used
Three drops from a pipette of Morrisons Semi-skimmed milk.
Potato Dextrose Agar (PDA)
Day 1 – after setting up
After 1 Week
After 2 and a half weeks
After 1 month
After 3 months