scientist test escherichia coli e.coli culture with eosin methylene blue emb agar in petri dish show the metallic green sheen

agar alcohol aseptic autoclave backdrop background bacteria biology black blue bright closeup coli colonies colony culture disease dish ecoli emb eosin escherichia experiment food glass gloves green growth hands health hold inflection isolate isolated lab laboratory light media medical medicine metallic methylene microbiology nitrile organic petri petrie plate red research science scientist selective sheen show technique test white