The crew moved a number of scientific experiments back and forth between the vehicles to return completed experiments to Earth and deploy new experiments at the station. Transfer items included a set of liver cell tissue samples from an experiment studying the function of human liver cells in microgravity, moved from the station onto the shuttle for return to Earth. Payload experiments such as Marshall Space Flight Center's protein crystal growth thermal enclosures for growing high-quality protein crystals in micro-gravity experiments were moved to and from the station. Seven water containers were transferred to the station.
Commander Jeff Ashby initiated a nitrogen transfer process that moved about 15 pounds of the gas from the shuttle to the station by the end of Friday. About another 35 pounds will be transferred through Flight Day 8.
STS-112 spacewalkers Dave Wolf and Piers Sellers, assisted by Pilot Pam Melroy, readied the EVA equipment for Saturday's excursion outside the station-shuttle complex. They recharged water on the extravehicular mobility unit, configured their tools and prepared the airlock.
Since it wasn't an EVA day, there was time for the crew to relate their experiences to several media organizations during live interviews. STS-112 Mission Specialists Sandy Magnus, Wolf and Sellers discussed Thursday's EVA and first-time experiences in space with CBS Radio Network and Cable News Network (CNN). Russian Commander Valery Korzun, Expedition Five Flight Engineer Sergei Treschev and STS-112 Mission Specialist Fyodor Yurchikhin participated in several interviews with the Russian press.
This evening, shortly before sleep, the crew reviewed procedures for tomorrow's spacewalk. Saturday the spacewalkers reverse positions for most of the EVA, with Sellers riding the arm and Wolf free-floating while tethered to the station. They'll attach umbilicals, install a second camera - this time on the U.S. laboratory Destiny, install spool positioning devices to quick disconnect fittings on ammonia lines and release radiator beam launch locks.
Completing the day, the crew had a joint meal in the Service Module. Wake up time Saturday is 4:16 a.m.