Changes

Other microbes that are butyric acid producers, probably won't be found in the brewhouse. These include bacteria that are commonly found in the guts of animals such as ''Butyrivibrio fibrisolvens'' <ref>[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC203391/ Cotta, M A, and R B Hespell. “Proteolytic Activity of the Ruminal Bacterium Butyrivibrio Fibrisolvens.” Applied and Environmental Microbiology 52.1 (1986): 51–58. Print.]</ref> and ''Eubacterium limosum'' <ref>[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3372111/ Lee, Meng-Rui et al. “Clinical and Microbiological Characteristics of Bacteremia Caused by Eggerthella, Paraeggerthella, and Eubacterium Species at a University Hospital in Taiwan from 2001 to 2010.” Journal of Clinical Microbiology 50.6 (2012): 2053–2055. PMC. Web. 22 June 2015.]</ref>. Some strains of ''Brettanomyces bruxellensis'' have been shown to produce butyric acid in growth media when supplemented with the amino acids phenylalanine and tyrosine <ref name="Lucy_2015">[http://www.ajevonline.org/content/66/3/379 Brettanomyces bruxellensis Aroma-Active Compounds Determined by SPME GC-MS Olfactory Analysis. C.M. Lucy Joseph, Elizabeth A. Albino, Susan E. Ebeler, Linda F. Bisson. 2015.]</ref>.