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 ...

Dr Helen Liang is proud of her 100% recycled petri dish, the first ever made in the UK Scientists have opened the UK's first facility that can recycle plastic waste from research labs. Every year ...

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.