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Methyl red is an indicator dye that turns red in acidic solutions. It is a pH indicator, turning red under pH 4.4, yellow over pH 6.2, and orange in between those values. It is used in microbiology in the Voges-Proskauer test to identify bacteria that produce stable acids through mixed acid fermentation of glucose. Methyl-red positive bacteria include Proteus vulgaris and Escherichia coli. Methyl-red negative bacteria include Enterobacter aerogenes and Serratia marcescens.
Bin Zhao.; Jeffrey S. Moore.; David J. Beebe. Surface-Directed Liquid Flow Inside Microchannels. Science. 2001, 291 (5506),1023-1026.
Shizhuo Yin.; Kun-Wook Chung.; Xin Zhu. A novel all-optic tunable long-period grating using a unique double-cladding layer. Opt. Commun.. 2001, 196 (1-6),181-186.