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  • Hordeum (embryo, peptide transport)  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • SPACECRAFT PROPULSION AND POWER
  • CHEMISTRY AND MATERIALS (GENERAL)
  • 1990-1994  (2)
Collection
Keywords
Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of the peptide carrier in the scutellum of barley embryos by photoaffinity labelling (1991)
    Springer
    Planta 186 (1991), S. 44-51 
    Details
    ISSN: 1432-2048
    Keywords: Embryo (peptide carrier) ; Hordeum (embryo, peptide transport) ; Peptide transport ; Photoaffinity probe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The preparation of a phenylalanine analogue containing an azido group and its incorporation into dipeptides is described. Peptides modified in this way are taken up into barley (Hordeum vulgare L.) scutella via the previously characterized peptide-transport system. Photoactivation of modified peptides in the presence of isolated scutella resulted in irreversible inhibition of peptide uptake in a concentration-dependent manner. Transport of other solutes which share a common mechanism of energy coupling, but which are transported via distinct carriers, was not inhibited after photo-derivatization of scutella with the modified peptides. Derivatization of isolated scutellar tissue with a 14C-labelled peptide analogue, resulted in incorporation of label into two proteins of Mr = 54000 and 41000. Scutellar tissue from early-germinating seeds, which do not show active peptide uptake, did not incorporate label into these polypeptides. It is concluded that these proteins are components of the barley peptide-transport system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201496
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    A spacecraft charging study on the SCEX 3 rocket (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Instruments on the SCEX 3 rocket payload were used to study charging during electron beam emissions. The data show that electrostatic analyzers can be used to measure vehicle charging and direct beam return currents in dense plasma conditions. The data also show return current dependencies on pitch angle, beam current and beam energy. It is found that if the proper care is taken, ESAs can be used to detect charging on vehicles in low altitude orbits which are contaminated with high levels of outgassing and in dense plasma regimes. These results are particularly important for the TSS-1 electrodynamic tether program where ESAs are being used to determine Shuttle charging levels during tether employment and to look for high fluxes of directly returning electrons during electron generator operations to balance the Shuttle charging.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 38; 1622-162
    Format: text
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    NASA TECHNICAL REPORTS
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