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The ability to preserve specimens at cryogenic temperatures is necessary for the analysis of specimens collected for many aspects of biological research. For spaceflight experiments flown on the Space Shuttle and the International Space Station (ISS), cryogenic preservation is important to avoid sample degradation before recovery. The increasing scientific demand for on-orbit cryogenic capability continues to stimulate further development of spaceflight hardware. The unique environment of a manned spacecraft presents many technical and operational challenges when designing and developing cryogenic systems. Power consumption and stowage volume are two such design limitations that illustrate the need for non-powered, passive cryogenic hardware. This paper will present an overview of passive cryogenic hardware that is currently in development by the Life Sciences Services Contract (LSSC) at Kennedy Space Center (KSC).

Engineers and scientists from BioServe Space Technologies and Kennedy Space Center (KSC) are developing a flight-rated payload for the evaluation of two space-based plant nutrient delivery systems (NDS's). The hardware is comprised of BioServe's Plant Generic Bioprocessing Apparatus (PGBA) and KSC's Porous Tube Insert Module (PTIM). The PGBA, a double-middeck locker, will serve as the host carrier for the PTIM and will provide computer control of temperature, relative humidity, and carbon dioxide levels. The PTIM will insert into the PGBA's growth chamber and will facilitate the side-by-side comparison of the two NDS's: 1) the porous tube NDS, consisting of six porous tubes with seeds mounted in close proximity to the tubes, and 2) a substrate-based NDS, with three compartments each containing a porous tube embedded in a particulate substrate.