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  • 1
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The sporicidal activity of gaseous propylene oxide was determined at several concentrations and at low and high relative humidity (RH). At 37°C, 85% RH, and a concentration of 1250 mg/L, propylene oxide will kill 90% of a population of dry spores of B. subtilis var. niger in one hour. If RH is lowered to 25% under the same conditions, 90% of the spores are killed in 40 minutes. Microbial decontamination of several flaked or powdered foods with propylene oxide was determined in 4-L rolling jars or in a 4-cu-ft revolving blender. The bacterial count of cereal flakes inoculated with dry spores of B. subtilis var. niger was reduced 95% in 4 hours at 37 and 55°C, hut further reduction in count was achieved only after prolonged holding times. Studies with cocoa powder showed that exposure to a propylene oxide concentration of l-2% by weight of cocoa (or 1000-2000 mg/L of space) at 37°C for 2-3 hours reduced bacterial count by 50-70% and thermophilic count by 50-90%. Destruction of molds and vegetative bacteria in cocoa or other foods was 90-99.9% under these conditions. Destruction of the microbial flora of cocoa was greater when the treated Cocoa was stored with some residual propylene oxide in bottles or plastic bags. Addition of liquid propylene oxide directly to small samples of cocoa gave good reduction of the microbial flora, but also some physical destruction of the contents.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2013-08-31
    Description: A Urine Sampling and Collection System (USCS) engineering model was developed to provide for the automatic collection, volume sensing and sampling of urine from each micturition. The purpose of the engineering model was to demonstrate verification of the system concept. The objective of the optimization and testing program was to update the engineering model, to provide additional performance features and to conduct system testing to determine operational problems. Optimization tasks were defined as modifications to minimize system fluid residual and addition of thermoelectric cooling.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: GE-75SDS4231 , NASA-CR-144401
    Format: application/pdf
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  • 3
    Publication Date: 2018-12-01
    Description: Biological and engineering problems in spacecraft sterilization, noting heat treatment
    Keywords: BIOTECHNOLOGY
    Format: text
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  • 4
    Publication Date: 2006-01-12
    Description: Truckloads of materials such as rare books, papers, engineering drawings, blue prints, art work, leather objects such as shoes, and clothing were successfully dried, decontaminated and impregnated against future infestation by microorganisms in a large 12 x 24 foot vacuum chamber designed originally for testing unmanned spacecraft. The process is unique in that it allows either frozen or wet material, soaked by some castastrophic event to be dried and sterilized in the same chamber with a minimum of handling and transportation.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: PAPER-47 , NASA. Goddard Space Flight Center 8th Conf. on Space Simulation; p 589-590
    Format: text
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  • 5
    Publication Date: 2019-07-13
    Description: The basic Waste Collection System (WCS) design under consideration utilized air flow to separate the stool from the WCS user and to transport the fecal material to a slinger device for subsequent deposition on a storage bowel. The major parameters governing stool separation and transport were found to be the area of the air inlet orifices, the configuration of the air inlet orifice and the transport air flow. Separation force and transport velocity of the stool were studied. The developed inlet orifice configuration was found to be an effective design for providing fecal separation and transport. Simulated urine tests and female user tests in zero gravity established air flow rates between 0.08 and 0.25 cu sm/min (3 and 9 scfm) as satisfactory for entrapment, containment and transport of urine using an urinal. The investigation of air drying of fecal material as a substitute for vacuum drying in a WCS breadboard system showed that using baseline conditions anticipated for the shuttle cabin ambient atmosphere, flow rates of 0.14 cu sm/min (5 cfm) were adequate for drying and maintaining biological stability of the fecal material.
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-140227 , DOC-74SD4221
    Format: application/pdf
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