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INNOVATIVE METHODOLOGY

Preventing annoyance from odors in spaceflight: a method for evaluating the sensory impact of rodent housing

¹Monell Chemical Senses Center, Philadelphia, Pennsylvania 19104; ²National Aeronautics and Space Administration Ames Research Center, Moffett Field, California 94035; ³BioServe Space Technologies, Aerospace Engineering Sciences Department, University of Colorado, Boulder, Colorado 80309; and ⁴Bioengineering Department, Clemson University, Clemson, South Carolina 29634

Submitted 22 April 2003 ; accepted in final form 24 July 2003

For the scientific community, the ability to fly mice under weightless conditions in space offers several advantages over the use of rats. These advantages include the option of testing a range of transgenic animals, the ability to increase the number of animals that can be flown, and reduced demands on shuttle resources (food, water, animal mass) and crew time (for water refill). Mice have been flown in animal enclosure module (AEM) hardware only once [Space Shuttle Transport System (STS)-90] and were dissected early in the mission, whereas rats have been flown in the AEM on >20 missions. This has been due, in part, to concerns that strong and annoying odors from mouse urine (vs. rat urine) will interfere with crew performance in the shuttle middeck. To screen and approve mice for flight, a method was developed to evaluate the odor containment performance of AEMs housing female C57BL/6J mice compared with AEMs housing Sprague-Dawley rats across a 21-day test period. Based on the results of this test, consensus was reached that mice could fly in the AEM hardware for up to 17 days (including prelaunch and contingency) and that the AEM hardware would likely contain odors beyond this duration. Human sensory and electronic nose analysis of the AEMs postflight demonstrated their success in containing odors from mice for the mission duration of STS-108 (13 days). Although this paper focuses specifically on odor evaluations for the space shuttle, the concern is applicable to any confined, closed-system environment for human habitation.

animal habitat; sensory evaluation

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