The agitation of cell cultures is problematic because the large mechanically sensitive eukaryotic cells can be destroyed by the cutting edges of any stirrer. And even completely round stirrers create eddies on their back side! Thus, the question arises: What is better?
1) either increase stirring speed and get good medium oxygenation and gas exchange and partially destroy cells or
2) to protect cells and work under suboptimal gas exchange in medium?
Nature has invented the right solution long before mankind appeared on earth! It is the shape of the fish tail, which has a perfect design which completely eliminates eddies (turbulences) in order to maximize the propulsion of the fish in water. When, in contrary, the fish tail is fixed then water will stream away with maximal efficiency.
It is clear that the very thin and soft rim of a fish tail has no cutting edge which would break cells. By mimicking the fish tail, LAMBDA created a new mixing disc, where high efficiency of stirring is provided without the destructive mechanical damaging and cutting of living cells. Thus, with the “Fish-Tail” stirring disks cell cultures with sensitive cells can be well aerated without destroying the cells.