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A method for floating at least one substance for growing a tissue part in a bioreactor. The method includes providing at least one substance consisting of one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including a tissue part thereon. The method further includes furt

A method for floating at least one substance for growing a tissue part in a bioreactor. The method includes providing at least one substance consisting of one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including a tissue part thereon. The method further includes further acting upon the substance with fluid, wherein the fluid holds the substance in free floatation. The fluid flows in a direction counter to gravity when a density of the substance is greater than a density of the fluid, and in a direction counter to buoyancy when a density of the substance is less than a density of the fluid. The bioreactor for floating at least one substance for growing a tissue part includes a container including a first flow chamber and at least one substance consisting of one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including a tissue part thereon. The substance is acted upon with fluid. The bioreactor further includes an apparatus for conveying the fluid. The substance is arranged in the first flow chamber in such a manner that the fluid holds the substance in free floatation.

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1. A method for floating at least one substance for growing a tissue part in a bioreactor, the method comprising:providing at least one substance consisting of one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including a tissue part thereon; and acting upon said substa

1. A method for floating at least one substance for growing a tissue part in a bioreactor, the method comprising:providing at least one substance consisting of one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including a tissue part thereon; and acting upon said substance with fluid, wherein the fluid holds the substance in free flotation; wherein the fluid flows in a direction counter to gravity when a density of said substance is greater then a density of the fluid, and in a direction counter to buoyancy when a density of said substance is less then a density of the fluid. 2. A method in accordance with claim 1, wherein the fluid has an increasingly lower flow speed in the direction counter to gravitation.3. A method in accordance with claim 1, wherein the substance is acted upon with at least one fluid jet.4. A method in accordance with claim 1, wherein a position of the substance in the bioreactor is measured by a sensor, and wherein a speed of the fluid in the bioreactor is regulated to hold the substance in flotation.5. A method in accordance with claim 1, wherein the fluid flows downward in the direction of gravitation, and wherein a gaseous fluid is led into the downward flowing fluid.6. A method in accordance with claim 5, wherein a flow of the gaseous fluid is slowed down by a flow of the downward flowing fluid.7. A method in accordance with claim 5, wherein the gaseous fluid is oxygen.8. A method in accordance with claim 5, wherein the gaseous fluid is air.9. A bioreactor for growing a tissue part comprising:a container comprising a first flow chamber; at least one substance consisting of one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including a tissue part thereon, wherein the substance is acted upon with fluid; and an apparatus for conveying the fluid, wherein the substance is arranged in the first flow chamber in such a manner that the fluid holds the substance in free flotation. 10. A bioreactor in accordance with claim 9 further comprising:a sensor; and a regulation apparatus, wherein the fluid conveying apparatus is connected to the first flow chamber, and wherein the regulation apparatus is connected to the fluid conveying apparatus and to the sensor in such a manner that the position of the substance may be measured and regulated. 11. A bioreactor in accordance with claim 9, wherein the first flow chamber widens upwardly.12. A bioreactor in accordance with claim 11, wherein the container has a section of the wall, wherein said section widens upwardly and forms the first flow chamber.13. A bioreactor in accordance with claim 9, wherein at least one fluid line opens into the first flow chamber.14. A bioreactor in accordance with claim 13 wherein the at least one fluid line is arranged such that it opens into the first flow chamber from below with respect to the first flow chamber.15. A bioreactor in accordance with claim 13 wherein the at least one fluid line is arranged such that it opens into the first flow chamber laterally with respect to the first flow chamber.16. A bioreactor in accordance with claim 9 further comprising at least one fluid guiding means arranged in the container, wherein the fluid guiding means forms the first flow chamber, and wherein the first flow chamber widens upwardly.17. A bioreactor in accordance with claim 16, wherein the fluid guiding means is a hollow body.18. A bioreactor in accordance with claim 17, wherein the hollow body has an inner space, and wherein said inner space widens upwardly and forms the first flow chamber.19. A bioreactor in accordance with claim 17, wherein the container comprises a wall, wherein the hollow body has an upwardly reducing outer contour, and wherein the hollow body is arranged in the container in such a manner that the first flow chamber is formed between said outer contour and the container wall.20. A bioreactor in accordance with claim 17, wherein the hollow body is formed in the shape of a truncated circular cone.21. A bioreactor in accordance with claim 9, wherein the container has at least one closeable opening.22. A bioreactor in accordance with claim 21, wherein the closeable opening has a surface of at least one fourth of a cross-sectional area of the container.23. A bioreactor in accordance with claim 21, wherein the closeable opening is arranged above the first flow chamber.24. A bioreactor in accordance with claim 9, wherein the fluid conveying apparatus is outside the container, and wherein the fluid conveying apparatus is connected to the container.25. A bioreactor in accordance with claim 9, wherein the fluid conveying apparatus comprises a fluid conveying means arranged inside the container.26. A bioreactor in accordance with claim 25, wherein the fluid conveying apparatus comprises an electric motor having a static motor part arranged outside the container and a rotatable motor part arranged inside the container, and wherein the fluid conveying means is connected to the rotatable motor part.27. A bioreactor in accordance with claim 26, wherein the electric motor is a canned motor, and wherein the rotatable motor part is rotated without a through-going shaft.28. A bioreactor in accordance with claim 26, wherein the fluid conveying apparatus comprises a magnetic coupling drive adapted for coupling to the rotatable motor part.29. A bioreactor in accordance with claim 26, wherein the rotatable motor part is journalled at least with respect to one degree of freedom with magnetically acting means.30. A bioreactor in accordance with claim 29, wherein the rotatable motor part is completely magnetically journalled.31. A bioreactor in accordance with claim 25, wherein the fluid conveying means is a vaned wheel.32. A bioreactor in accordance with claim 9 further comprising a second flow chamber arranged above the first flow chamber, wherein the second flow chamber is formed in such a manner that fluid flowing from top to bottom therein has a lower speed with decreasing height.33. A bioreactor in accordance with claim 32, wherein the first and the second flow chambers form a common inner space which has an inlet opening for the fluid at the top and at the bottom and which has an outlet opening between the top and bottom inlet opening.34. A bioreactor in accordance with claim 32, wherein the fluid conveying means is a pump that is connected to the top and bottom inlet opening and to the outlet opening in such a manner that the quantity of fluid flowing into the top and bottom inlet opening may be controlled.35. A method for floating a substance for growing a tissue part in a bioreactor, the method comprising:providing at least one substance consisting of at least one of a tissue part, a scaffold having cells deposited thereon, and a scaffold including one or more tissue parts thereon; and acting upon said substance with fluid, wherein the fluid holds the substance in free flotation; wherein the fluid flows in a direction counter to gravity when a density of said substance is greater then a density of the fluid, and in a direction counter to buoyancy when a density of said substance is less then a density of the fluid. 36. A method in accordance with claim 35, wherein the substance is acted upon with at least one fluid jet.37. A method in accordance with claim 35, wherein a position of the substance in the bioreactor are measured by a sensor, and wherein a speed of the fluid in the bioreactor is regulated to hold the substance in floatation.38. A method in accordance with claim 35, wherein the fluid flows downward in the direction of gravity, and wherein a gaseous fluid is led into the downward flowing fluid.39. A method in accordance with claim 38, wherein a flow of gaseous fluid is slowed down by a flow of the downward flowing fluid.40. A method in accordance with claim 35, wherein the fluid has an increasingly lower speed in the direction counter to gravity.41. A bioreactor comprising a container for a substance, the bioreactor comprising:a first flow chamber to which a flowing fluid may be supplied, with the first flow chamber being designed such that the fluid flowing upwardly therein has a lower speed with increasing height; and a second flow chamber arranged above the first flow chamber, the second flow chamber being designed such that fluid flowing from top to bottom within the second flow chamber has a smaller speed with decreasing height; wherein the first flow chamber and the second flow chamber form a common inner space that has a first inlet opening for the fluid at a top of the common inner space and a second inlet opening for the fluid at a bottom of the common space; and wherein the common inner space has an outlet opening between the first and second inlet openings.