ISOLATION OF PURIFIED TGF- 1 AND TGF- 2 FROM BONE TISSUE

摘要

A corrugated heat exchanger element (30) may have grooves (36) and ribs (38) on the interior and exterior surfaces of the tube. The corrugations on the tube may be linear corrugations or helical corrugations. The texturing of the interior and exterior surfaces (32, 34) of the tube, and the corrugations in the tube may provide a heat exchanger element (30) that has a large surface area. The surface texturing and corrugations may also provide a heat exchanger element that promotes internal mixing of fluids that flow by and through the element. Increased internal mixing and increased surface area of an element may allow the heat exchanger element to have a high heat transfer coefficient. A heat exchanger element (30) or heat exchanger elements may be assembled into a heat exchanger that has a high overall heat transfer coefficient. Ends of the heat exchanger element may be pointed to focilitate attachment of the element to a support structure.