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  • 1
    Electronic Resource
    Electronic Resource
    Sodium-calcium interactions in two wheat species differing in salinity tolerance (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 99 (1997), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Sodium/calcium interactions were compared in two species of wheat known to differ in sodium accumulation in the shoot and biomass reduction under saline conditions. Unidirectional uptake of 22Na to the roots was measured in 5, 50, 100 and 150 mM NaCl with four levels of calcium activity. Translocation of sodium to the shoot was measured as 22Na uptake over 7 days. The rate of sodium uptake into the roots did not vary between the salt-sensitive Triticum turgidum cv. Modoc and the tolerant Triticum aestivum cv. Kharchia. except at low calcium, when the rate of uptake was higher in Kharchia, and more sensitive to inhibition by additional calcium. The rate of translocation to the shoot was similar in both species, however the shootroot ratio was higher in Kharchia and so the concentration of sodium, on a shoot fresh weight basis, was more dilute in Kharchia. There was no evidence for differences in sodium transport processes between the species which might confer differential salinity tolerance. Translocation of calcium to the shoot was measured as 45Ca uptake in 5 and 150 mM NaCl with 4 levels of calcium activity. Translocation of calcium was more inhibited by sodium in the salt-sensitive Modoc, and this may reflect differences in calcium transport processes, which could account in part for the greater salt sensitivity of this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1997.tb05419.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Investigating glutamate receptor-like gene co-expression in Arabidopsis thaliana (2008)
    Wiley
    Details
    Publication Date: 2008-06-01
    Print ISSN: 0140-7791
    Electronic ISSN: 1365-3040
    Topics: Biology
    Published by Wiley
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    PAPER CURRENT
  • 3
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    Testing Evaluation of the Electrochemical Organic Content Analyzer (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The breadboard electrochemical organic content analyzer was evalauted for aerospace applications. An awareness of the disadvantages of expendables in some systems resulted in an effort to investigate ways of reducing the consumption of the analyzer's electrolyte from the rate of 5.17 kg/30 days. It was found that the electrochemical organic content analyzer can result in an organic monitor in the water quality monitor having a range of 0.1 to 100 mg/1 total organic carbon for a large number of common organic solutes. In a flight version it is anticipated the analyzer would occupy .0002 cu m, weigh 1.4 kg, and require 10 W or less of power. With the optimum method of injecting electrolyte into the sample (saturation of the sample with a salt) it would expend only 0.04 kg of electrolyte during 30 days of continuous operation.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-160569 , LSI-TR-334-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Advanced water iodinating system (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Potable water stores aboard manned spacecraft must remain sterile. Suitable sterilization techniques are needed to prevent microbial growth. The development of an advanced water iodinating system for possible application to the shuttle orbiter and other advanced spacecraft, is considered. The AWIS provides a means of automatically dispensing iodine and controlling iodination levels in potable water stores. In a recirculation mode test, simulating application of the AWIS to a water management system of a long term six man capacity space mission, noniodinated feed water flowing at 32.2 cu cm min was iodinated to 5 + or - ppm concentrations after it was mixed with previously iodinated water recirculating through a potable water storage tank. Also, the AWIS was used to successfully demonstrate its capability to maintain potable water at a desired I2 concentration level while circulating through the water storage tank, but without the addition of noniodinated water.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-141937 , LSI-ER-218-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation and characterization of the methane-carbon dioxide decomposition reaction (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A program was conducted to evaluate and characterize the carbon dioxide-methane (CO2-CH4) decomposition reaction, i.e., CO2 + CH4 = 2C + 2H2O. The primary objective was to determine the feasibility of applying this reaction at low temperatures as a technique for recovering the oxygen (O2) remaining in the CO2 which exits mixed with CH4 from a Sabatier CO2 reduction subsystem (as part of an air revitalization system of a manned spacecraft). A test unit was designed, fabricated, and assembled for characterizing the performance of various catalysts for the reaction and ultraviolet activation of the CH4 and CO2. The reactor included in the test unit was designed to have sufficient capacity to evaluate catalyst charges of up to 76 g (0.17 lb). The test stand contained the necessary instrumentation and controls to obtain the data required to characterize the performance of the catalysts and sensitizers tested: flow control and measurement, temperature control and measurement, product and inlet gas analysis, and pressure measurement. A product assurance program was performed implementing the concepts of quality control and safety into the program effort.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA-CR-143890 , ER-207-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Water electrolysis system - H2 and O2 generation (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An oxygen generation system design based on the static feed water electrolysis concept is described. The system is designed to generate 4.20 kg/d of oxygen to satisfy the metabolic needs of a three-person crew, to compensate for spacecraft leakage, and to provide the oxygen required by the electrochemical depolarized CO2 concentrator. The system has a fixed hardware weight of 75 kg, occupies a volume of 0.11 cu m, and requires only 1.1 kw of electrical power. The static feed electrolysis concept is discussed, and experimental data on the high-performance electrode are presented.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: ASME PAPER 78-ENAS-3 , American Society of Mechanical Engineers, Intersociety Conference on Environmental Systems; Jul 10, 1978 - Jul 13, 1978; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Integrated Oxygen-Recovery System (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: System for revitalizing breathing air in enclosed environment converts carbon dioxide and water to oxygen and methane. Chemical conversions take place in reactor module containing solid-metal-cathode water electrolyzer integrated with Sabatier reactor. According to design estimates, fully developed version of system sized to maintain breathable air for four persons, occupies 67 percent less volume, weighs 60 percent less, and consumes 3.4 percent less power than system of same capacity in which electrolyzer and Sabatier reactor are distinct components. Although oxygen primary desired end product in system originally contemplated, product methane also of value in industrial version of system.
    Keywords: PHYSICAL SCIENCES
    Type: MFS-26266 , NASA Tech Briefs (ISSN 0145-319X); 20; 3; P. 52
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Measuring Thicknesses of Wastewater Films (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Sensor determines when thickness of film of electrically conductive wastewater on rotating evaporator drum exceeds preset value. Sensor simple electrical probe that makes contact with liquid surface. Made of materials resistant to chemicals in liquid. Mounted on shaft in rotating cylinder, liquid-thickness sensor extends toward cylinder wall so tip almost touches. Sensor body accommodates probe measuring temperature of evaporated water in cylinder.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: MSC-20915 , NASA Tech Briefs (ISSN 0145-319X); 11; 3; P. 23
    Format: text
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    NASA TECHNICAL REPORTS
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