English: Methyl red test: Escherichia coli (left), showing a positive result (the microorganism has produced a large amount of acid during fermentation of glucose, which is detected by the pH indicator), and Enterobacter cloacae (right) showing a negative result (the microorganism has produced a small amount of acid or no acid during fermentation of glucose).
Deutsch: Methylrot-Probe: Escherichia coli (links), mit positivem Ergebnis (der Mikroorganismus hat eine große Menge an Säure während der Fermentation von Glucose gebildet, die durch den pH-Indikator angezeigt wird), und Enterobacter cloacae (rechts) mit negativem Ergebnis (der Mikroorganismus hat nur geringe Säuremengen oder gar keine Säure in der Fermentation von Glucose gebildet).
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