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And in regards to liquid cultures and storage:
''"I'm not sure about the liquid cultures - I freeze mine at -80°C (lab freezer), which (stores) indefinitely. As a rule refrigerated liquid cultures should last longer... but there is anecdotal evidence (for some species) of poorer survival of refrigerated versus room temp in liquid cultures. IMO, stable temps are likely more important for non-frozen stocks than hitting an 'ideal' temperature."'' <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1067614393266774/ Conversation with Bryan Heit on Milk The Funk. 05/04/2015.]</ref>
== Commercially available Lactobacillus strains and their pH change over time ==