Microbial Metabolism Saccharomyces cerevisiae Sugar Ethyl alcohol CO2 Lactic acid bacteria Malic acid Lactic acid Acetobacter or Gluconobacter Ethyl alcohol Acetic acidMicrobial Metabolism Sugar Ethyl alcohol + CO2 Saccharomyces cerevisiae Malic acid Lactic acid Lactic acid bacteria Ethyl alcohol Acetic acid Acetobacter or Gluconobacter