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The two have not trained for a pump module replacement but had extensive spacewalk training together.
Once again, a circuit breaker blew, indicating a problem with the pump module.
The pump module measures five and a half feet long, a bit more than four feet across and three feet high.
The spare 780-pound coolant pump, built by Boeing, is mounted on an external platform just in front of the station's airlock module, relatively close to the faulty pump module.
NASA engineers and managers at the Johnson Space Center gave preliminary approval on Sunday for "an initial spacewalk no earlier than Thursday by Wheelock and Caldwell Dyson to replace the pump module," NASA said in a statement.
Mounted on twin pallets in Atlantis's payload bay are two spare gyroscopes, used to control the space station's orientation in space, a high-pressure oxygen tank for the lab's airlock, and a spare pump module, ammonia coolant and nitrogen that will be needed at some point by the station's cooling system.
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Flash chromatography was performed with a Buchi Pump manager C-615 flash model operating with two pump modules C-605.
Medium Pressure Liquid Chromatography MPLCC) was performed on a Büchi Sepacore System equipping with pump manager C-615, pump modules C-605 and fraction collector C-660 (Büchi Labortechnik AG, Flawil, Switzerland), and columns packed with Chromatorex C-18 (40 75 μm, Fuji Silysia Chemical Ltd., Kasugai, Japan).
According to this mechanism, two pump modules are driven by two conformational strokes that are generated by stabilization of the anionic forms of semiquinone and ubiquinol that are formed in the peripheral arm of complex I during turnover.
Medium pressure liquid chromatography (MPLC) was performed on a Büchi Sepacore System equipped with pump manager C-615, pump modules C-605 and fraction collector C-660 (Büchi Labortechnik AG, Flawil, Switzerland), and columns packed with Chromatorex C-18 (dimensions 450 mm × i.d. 14 mm, particle size: 40 75 μm, Fuji Silysia Chemical Ltd., Kasugai, Japan).
Medium pressure liquid chromatography (MPLC) was performed on a Büchi Sepacore System equipping with pump manager C-615, pump modules C-605, and fraction collector C-660 (Büchi Labortechnik AG, Switzerland), and columns packed with Chromatorex C-18 (40 75 μm, Fuji Silysia Chemical Ltd., Japan).
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