Phase-contrast microscopy is entirely label-free, allowing cells to move about on a petri dish closer to their native state, and is not affected by the optical properties of the plastic petri ...

Phase-contrast microscopy is entirely label free, allowing cells to move about on a petri dish closer to their native state, and is not affected by the optical properties of the plastic petri ...

In it, an apparently normal-looking petri dish is treated so as to reveal a message when wetted with water vapor. The contrast between hydrophobic and hydrophilic surfaces, which is not visible to ...

Petri dish A glass or plastic circular dish. Used in combination with agar to grow cells. Quadrat A square grid, often 1m squared. Used to sample plants or slow moving animals e.g. snails.

It is therefore important that any petri dish or agar used is sterilised before use, and that aseptic techniques are used to inoculate the plates. An inoculating loop can be used to transfer bacteria.