Abstract: A method and apparatus for reducing the emission of pollutants resulting from static test firings of rocket and jet engines. The apparatus comprises a test stand for capturing the exhaust gas from an engine undergoing a static test. The test stand includes a duct system for guiding the exhaust gas from a duct inlet to a duct outlet through stages that reduce the exhaust gas pollutants. Liquid oxygen (“LOX”) is introduced into the duct system to interact with the engine exhaust gas stream. By introducing LOX, the pollutant CO is converted to non-pollutant carbon dioxide (“CO2”) as the exhaust stream moves through the duct system.

Abstract: A bioreactor and cell culturing method using the bioreactor have been developed to enhance cell production and growth and decrease the shear forces on the cells and multicellular aggregates. The bioreactor contains a dome-shaped culture vessel having walls defining an interior volume, an apex, a bottom circular edge, and a axis of symmetry perpendicular to the bottom circular edge; and a gas-permeable membrane fluidtightly integrated with the bottom circular edge of the culture vessel. The bioreactor may further contain a rotating base fluidtightly integrated with the gas-permeable membrane, wherein the rotating base is fixed to rotate about the axis of symmetry of the dome-shaped culture vessel set on a substantially horizontal axis.