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986

Centuries: 9th century - 10th century - 11th century

Decades: 930s 940s 950s 960s 970s - 980s - 990s 1000s 1010s 1020s 1030s

Years: 981 982 983 984 985 - 986 - 987 988 989 990 991


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Lactic acid

... lactic acid fermentation is performed by lactic acid bacteria[?] which are responsible for the sour taste of old milk and which are used in the production of dairy product ...