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  • American Institute of Physics (AIP)  (2)
  • Munksgaard International Publishers  (1)
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  • 1
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The capability for making ongoing characterization measurements of the spatial resolution and spectral reflectance of the Wölter x-ray optics used at Nova is essential for the interpretation of data taken with these imaging diagnostics. Equally important is an assessment of the long-term performance of grazing incidence x-ray optics used in the harsh environment of an ICF target chamber. We have designed and are currently building an off-line facility for such a characterization. The facility will consist of an x-ray source with specially designed pinhole-target foil array, the Wölter optics housing, monitoring and measuring detectors, a data acquisition system, and an in situ alignment system for rapid periodical verification. Each component of this lab will be discussed, along with possible initial results. This work was performed under the auspices of the U. S. Department of Energy by the Lawrence Livermore National Laboratory under contract No. W-7405-ENG-48.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The expression of anthocyanin biosynthesis genes during flower colour development in Anthurium andraeanum (anthurium) was studied. A cDNA library was constructed from mRNA from the anthurium spathe, and full-length cDNA clones identified for the flavonoid biosynthetic enzymes chalcone synthase (CHS), flavanone 3-hydroxylase (F3H), dihydroflavonol 4-reductase (DFR) and anthocyanidin synthase (ANS). These were used to measure transcript levels in the spathe during flower development, in cultivars with different flower colours, over the diurnal cycle, and in the spadix. CHS, F3H and ANS were expressed at all stages of spathe and spadix development. However, DFR transcript levels varied significantly between stages, and DFR may represent a key point of regulation. A diurnal rhythm of DFR transcript abundance in the spathe was also observed, with transcript levels high at dawn and dusk and low at noon. Control of anthocyanin biosynthesis in anthurium spathe differs from that described for flowers of other species, with DFR a key regulatory point and a complex mix of developmental and environmental control signals.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed an off-line facility for very precise characterization of the reflectance and spatial resolution of the grazing incidence Wölter type I x-ray optics used at Nova. The primary component of the facility is a new, very versatile, high brightness x-ray source consisting of a focused DC electron beam incident onto a precision manipulated target-pinhole array. The data are recorded with a selection of detectors. For imaging measurements we use direct exposure x-ray film modules or an x-ray charge-coupled device camera. For energy-resolved reflectance measurements, we use lithium drifted silicon detectors and a proportional counter. An in situ laser alignment system allows precise location and rapid periodic alignment verification of the x-ray point source, the statically mounted Wölter optic, and the chosen detector. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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