escherichia coli e.coli cultured with eosin methylene blue emb agar in petri dish show the metallic green sheen colonies using

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