Plastic Mixing Beads

Polystyrene beads, 6 mm diameter, density 1.1 g/ml and 1.8 g/ml.  Sold in bottle containing approximately 1000 count.  The spherical beads are used to enhance the mixing or stirring of solutions placed on slow rpm shakers, rotators, or rocking lab equipment. The stirring action is gentle, with minimal shearing forces. 

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Prime example:  Single-cell isolation from tissue.  The inert, plastic stirring beads gently massage the tissue during digestion of the intracellular matrix with proteolytic enzymes. The tedious trituration step of the classic method is eliminated.  Single-cell yields are enhanced and digestion time is shortened.  For more on this specific example, see "Enhanced Enzymatic Dispersion of Primary Cells from Tissue"