use in the acclimatizing culture medium to prepare the wild chinese hawthorn extract 500 g of fresh wild chinese hawthorn is dried under sterile conditions to reduce water content u2266 8 the dried fruit is then ground u2267 20 mesh and added to 1500 ml of sterile water the hawthorn slurry is allowed to stand for 6 hours at 4 u00b0 c under sterile conditions the hawthorn supernatant is collected to be used in the acclimatizing culture medium to prepare the yeast compositions of the invention an apparatus depicted in fig2 or an equivalent thereof can be used this apparatus includes three containers a first container 1 a second container 2 and a third container 3 each equipped with a pair of electrodes 4 one of the electrodes is a metal plate placed on the bottom of the containers and the other electrode comprises a plurality of electrode wires evenly distributed in the space within the container to achieve even distribution of the electric field energy all three pairs of electrodes are connected to a common signal generator the culture medium used for this purpose is a mixed fruit extract solution containing the following ingredients per 1000 l 300 l of wild chinese hawthorn extract 300 l of jujube extract 300 l of schisandra chinensis turez baill seeds extract and 100 l of soy bean extract to prepare hawthorn jujube and schisandra chinensis turez baill seeds extracts the fresh fruits are washed and dried under sterile conditions to reduce the water content to no higher than 8 one hundred kilograms of the dried fruits are then ground gt 20 mesh.