title: Phase separated membrane bioreactor:  results from model system studies.
abstract: The operation and evaluation of a bioreactor designed for high intensity oxygen transfer in a microgravity environment is described.  The reactor itself consists of a zero headspace liquid phase separated from the air supply by a long length of silicone rubber tubing through which the oxygen diffuses in and the carbon dioxide diffuses out.  Mass transfer studies show that the oxygen is film diffusion controlled both externally and internally to the tubing and not by diffusion across the tube walls.  Methods of upgrading the design to eliminate these resistances are proposed.  Cell growth was obtained in the fermenter using Saccharomyces cerevisiae showing that this concept is capable of sustaining cell growth in the terrestrial [correction of terrestial] simulation.
authors.affiliation: Jet Propulsion Laboratory, Pasadena, CA 91109.
authors.forename: G R
authors.initials: GR
authors.lastname: Petersen
authors.forename: P K
authors.initials: PK
authors.lastname: Seshan
authors.forename: E H
authors.initials: EH
authors.lastname: Dunlop
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism; D015194:Diffusion Chambers, Culture; D018504:Ecological Systems, Closed; D004867:Equipment Design; D005285:Fermentation; D005524:Food Technology; D008021:Life Support Systems / Q000295:instrumentation*; D010100:Oxygen / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000254:growth & development*; D012826:Silicone Elastomers; D013026:Space Flight / Q000295:instrumentation; D018505:Waste Management; D014893:Weightlessness
chemical_list: D012826:Silicone Elastomers; D002245:Carbon Dioxide; D010100:Oxygen