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  • 1
    Electronic Resource
    Electronic Resource
    Calcium-dependent induction of novel proteins by abscisic acid in wheat aleurone tissue of different developmental stages (1989)
    Springer
    Planta 179 (1989), S. 156-164 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid and protein synthesis ; Aleurone ; Calcium and protein synthesis ; Protein synthesis ; Protein phosphorylation ; Seed development ; Triticum (ABA, Ca2+, protein synthesis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aleurone tissue of mature wheat (Triticum aestivum L. cv. Sappo) grains make novel polypeptides in response to abscisic acid (ABA), but only in the presence of Ca2+. Effects of ABA plus Ca2+ include up- and down-modulation of other polypeptides. The ABA-induced polypeptides appear not to be the 21-kilodalton (kDa) amylase inhibitor which has been reported to be ABA-inducible in barley. Aleurone tissue from developing grains of different ages failed to respond to ABA plus Ca2+ in any way. Endogenous ABA levels were determined by monoclonal radioimmunoassay in developing, mature, and “sensitised” developing tissues. The ABA level rose to a maximum at 35 days post anthesis but was not detectable in mature cells. Developing layers sensitised to gibberellic acid (GA) showed decreased levels of ABA, similar to those in mature tissue, concurrent with acquired responsiveness to GA in respect of its induction of α-amylase. However, these sensitised cells still remained non-responsive to added ABA in terms of modulation of polypeptide pattern, though they did respond to ABA in the blocking of GA-induced α-amylase production. The role of protein phosphorylation in signal transduction was examined. The implications of these findings are discussed with reference to the role of ABA in developing and mature aleurone cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393685
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A hybrid electronically scanned pressure module for cryogenic environments (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Pressure is one of the most important parameters measured when testing models in wind tunnels. For models tested in the cryogenic environment of the National Transonic Facility at NASA Langley Research Center, the technique of utilizing commercially available multichannel pressure modules inside the models is difficult due to the small internal volume of the models and the requirement of keeping the pressure transducer modules within an acceptable temperature range well above the -173 degrees C tunnel temperature. A prototype multichannel pressure transducer module has been designed and fabricated with stable, repeatable sensors and materials optimized for reliable performance in the cryogenic environment. The module has 16 single crystal silicon piezoresistive pressure sensors electrostatically bonded to a metalized Pyrex substrate for sensing the wind tunnel model pressures. An integral temperature sensor mounted on each silicon micromachined pressure sensor senses real-time temperature fluctuations to within 0.1 degrees C to correct for thermally induced non-random sensor drift. The data presented here are from a prototype sensor module tested in the 0.3 M cryogenic tunnel and thermal equilibrium conditions in an environmental chamber which approximates the thermal environment (-173 degrees C to +60 degrees C) of the National Transonic Facility.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-110146 , NAS 1.15:110146
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Residual stress measurement and analysis using ultrasonic techniques. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A technique which utilizes ultrasonic radiation has been developed to measure residual stresses in metals. This technique makes it possible to detect and measure the magnitude of the principle stresses and also to obtain their direction. The velocities of ultrasonic waves in materials are measured as the time to travel a fixed path length, and the change in transit time is related to the applied stress. The linear relationship obtained allows a procedure based on this principle to be used for the measurement of residual stress using surface waves and shear waves. A method for plotting stress profiles through a material using surface waves uses varying frequencies for the ultrasonic wave. A limitation of the shear wave method is considered. The system used for this technique is called the Modified Time of Flight System.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Testing and Evaluation; 1; May 1973
    Format: text
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    NASA TECHNICAL REPORTS
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