malt extract agar in petri dish close up, using for growth media to isolate and cultivate yeasts, molds and fungal testing.

agar air alcohol anaerobic aseptic autoclave backdrop background bacteria biology bright clinical close closeup colonies colony conkey contamination counter cultivate culture disease dish ecoli enterovirus environmental experiment extract food fungal fungi glass gram growth health infection inflection investigation isolate isolated lab laboratory light mac malt media medical medicine methylene microbiology molds negative organic petri plate red research room samples science selective source species spread technique test testing using yeasts