Mixer having means for periodically mechanically striking liquid-containing tubes to induce motion of the tubes

A mixer for mixing substances, resuspending pellets and disintegrating living cells, including yeast cells, placed in tubes comprising:

• a base, a tube holder and an electric motor with at least one striking attachment;
• said base supporting said tube holder;
• said tube holder having a supporting structure and at least two rigid spaced apart rings rigidly attached to the supporting structure;
• said rings having a number of registered holes the tubes can be supportingly placed in, the at least two rigid rings being located apart at a distance providing contact of each tube with at least two of the at least two rigid rings rings:
• one ring at the upper part of the tube and another ring at the lower part of the tube;
• said holes having diameters larger than diameters of the tubes which are to be placed therein, so that there are gaps between the tubes and the holes, the holes being positioned on the rings so that the distances from the points nearest to the motor shaft, of each of the holes, to the axis of the motor shaft are equal;
• said electric motor having an extended shaft with the at least one striking attachment affixed thereto, which extended shaft is located inside the tube holder, coaxial with the rings of the tube holder;
• said at least one striking attachment including at least one blade extended from said shaft;
• and
• said at least one blade having a length which provides striking engagement with said tubes when the motor shaft rotates.