Investigations for the comparison of culture media serving for the determination of the number of yeasts and lactic acid bacteria in beers

acide acide gras acide lactique acide organique acids agent de conservation alcoholic beverages alimentos bebidas beers beverages boisson cervezas fatty acids fermented products foods growing media lactic acid levadura levure lipide lipids medio de cultivo organic acids organic compounds plantas plante plants preservadores preservatives productos productos fermentados products produit produit alimentaire substrat de culture yeasts