TY JOUR TI Optimizing Probiotic Starter Consortia for Shelf-Stable Frozen Yogurt KW propionic acid microorganisms KW Lactobacillus bulgaricus KW Lactobacillus acidophilus KW fermentation of dairy mix KW microbial survival KW metabolism JO Dairy industry AU Matveeva, E.S. AU Tvorogova, A.A. AU Landikhovskaya, A.V. PY 2026 IS PB Kemerovo State University