INTERNATIONAL SPACE STATION
                       Expedition Two Science Operations

               Status Report for the week ending, April 11, 2001

 The Expedition Two Space Station crew transmitted the first science data to
 the scientists on the ground Wednesday night using the Station's Ku band
 antenna.

 A massive 610 megabytes of data, representing 61 files of tests with the
 Middeck Active Control Experiment - MACE - were transmitted from the
 Station to NASA ground controllers, who distributed it to experimenters.

 Earlier Station science data on the Hoffman Reflex neurological experiment
 was downlinked using the Space Shuttle communications system.   Station
 science data is transmitted using the KU band antenna because it can
 transmit data faster than the S band antenna used for voice communications.

 MACE studies the effects of vibrations on moving structures in space.  The
 results are expected to help engineers design and build lighter, stronger,
 space structures.

 The experiment platform is 60 inches (152 cm) long, including four struts
 and five nodes.  Astronauts use a hand control unit to make gimbals and
 reaction wheels on one side to vibrate while gimbals and wheels on the
 other side try to damp the vibration.

 MACE involves science teams from the Air Force Research Laboratory at
 Kirtland Air Force Base in New Mexico and the Massachusetts Institute of
 Technology at Cambridge.

 Flight Engineer Susan Helms conducted several tests using the MACE
 equipment during the past week.  In addition, the Expedition Two crew also
 monitored the operation of automated radiation-measuring experiments and
 participated in a study of crew relationships.

 The Bonner Ball Neutron Detector and the Dosimetric Mapping radiation
 experiments continued to collect radiation data that will be used to more
 accurately predict human radiation exposure during long-duration missions
 and develop counter-measures to safely prolong human exposure to radiation
 during space travel.  Flight Engineer Jim Voss kept the experiment hard
 drives changed out with fresh units with additional memory storage.

 Dr. Tateo Goka, of the National Space Development Agency of Japan, is the
 principal investigator for Bonner Ball.  Dr. Guenter Reitz of the German
 Space Agency, is the principal investigator for DOSMAP.

 Using a laptop computer, the crew continued to fill out questionnaires as
 part of the Interactions experiment.  After the mission, their answers to
 questions about living and working with their colleagues will help
 experimenters identify and characterize interpersonal and cultural factors
 that may affect crew performance in space.

 Dr. Nick Kanas, of the Veterans Administration Medical Center in San
 Francisco, is the principal investigator for Interactions.

 A pair of Earth photography experiments - Crew Earth Observations and
 EarthKAM - are on the crew's task list for the week as time permits during
 the early phase of setting up the orbiting laboratory.

 The Payload Operations Center is also busy planning for the next Space
 Shuttle mission, which will carry two additional payload racks and many new
 experiments to the Space Station.   These experiments include the first
 commercial experiments, developed by private companies through NASA's
 Commercial Space Centers across the United States.

 Editor's Note: The Payload Operations Center at NASA's Marshall Space
 Flight Center in Huntsville, Ala., manages all science research experiments
 aboard the International Space Station.  The center is also home for
 coordination of the mission-planning work of a variety of international
 sources, all science payload deliveries and retrieval, and payload training
 and payload safety programs for the Station crew and all ground personnel.