view from microbiologist’s eye on loop in flame during passage

agar background bacteria bacterial bacteriology biological biology biotechnology burner candlewick cell clinic close colonies color cultivation danger dish exam fire flame growth health healthcare hygiene image incubate incubator laboratory lamp medical medicine micro microbiology microorganisms object passage pathogen pathogenic petri plate prokaryote reinoculation research reseeding risk safety sample scientific spirit strain subcloning subcultivation test unhygienic warning wick