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  • 1
    Electronic Resource
    Electronic Resource
    Submicrometer x-ray beam production by a thin film waveguide (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4471-4473 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A hard x-ray waveguide capable of reducing a 13 keV monochromatic beam in one direction from 30 to only 0.1 μm has been characterized with synchrotron radiation. The guiding structure consisted of a carbon layer sandwiched between two Ni layers sputter-deposited onto float glass. A beam exiting at the end of the guide in guiding direction was observed when a resonance effect due to the formation of x-ray standing waves in the total reflection region takes place. The measured beam divergence (1.3 mrad) agrees with expectations. The total efficiency (exiting photon flux/incident photon flux) can ideally exceed 10−2 but is only 10−4 for this first prototype. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361761
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  • 2
    Electronic Resource
    Electronic Resource
    Background reduction in experiments with x-ray glass capillary optics (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4061-4063 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An analysis of the background at the exit of tapered borosilicate glass capillaries in synchrotron radiation scattering experiments suggests scattering due to short-range order at larger angles while low-angle scattering is attributed to phase separation in the glass. Background scattering can be largely suppressed by introducing a pinhole aperture at the exit of the capillary. The lowest background was obtained for a pinhole approaching the size of the exit beam. Background reduction is particularly important for wide- and small-angle scattering experiments on weakly scattering samples like thin polymeric fibers. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147551
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  • 3
    Electronic Resource
    Electronic Resource
    Improved capillary optics applied to microbeam x-ray fluorescence: Resolution and sensitivity (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 24-27 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new and improved type of x-ray capillary optics unit (ellipsoidal), is developed, tested, and characterized using a table-top x-ray microbeam setup. The beam profiles of the x-ray beams generated by the 7.5 μm ellipsoidal capillary were constructed from "knife-edge'' scans across the beam. The detection limits for various elements were determined, and the spatial resolution, when the beam was used in scanning mode, was demonstrated. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145266
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  • 4
    Electronic Resource
    Electronic Resource
    Testing of submicrometer fluorescence microprobe based on Bragg–Fresnel crystal optics at the ESRF : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1461-1463 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An x-ray fluorescence microprobe with circular Bragg–Fresnel lens was tested at the European Synchrotron Radiation Facility Microfocus beamline. A focal spot of 0.7 μm was observed using the knife-edge technique at the energy 7.6 keV (wavelength 1.6 A(ring)). The intensity in the focal spot was measured to 108 ph/s in energy bandwidth of 10−5. The fluorescence microprobe was applied for mapping 100 μm size micrometeorite at 13.5 keV. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145941
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  • 5
    Electronic Resource
    Electronic Resource
    Microdiffraction instrumentation and experiments on the microfocus beamline at the ESRF : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1348-1350 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A microfocus beamline has been installed at an ESRF undulator. The applications of this beamline will be mainly in diffraction and diffuse scattering. An ellipsoidal mirror has been commissioned which results in a flux of 2×1011 Ph/s in a 10 μm (circular) collimated beam at 13 keV at a bandwidth of about 3 eV. Further tests on capillary optics and Bragg–Fresnel optics have been done. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145971
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  • 6
    Electronic Resource
    Electronic Resource
    Submicrometer fluorescence microprobe based on Bragg-Fresnel optics (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 827-829 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An x-ray fluorescence microprobe with linear Bragg-Fresnel lens was tested at the European Synchrotron Radiation Facility Microfocus beamline. A focal line with a width of 0.8 μm was observed using the knife-edge technique at a wavelength of 0.85 A(ring) (14.6 eV). Wiener filtering with the Fast Fourier Transformation was applied to solve a convolution equation to evaluate the size of the probe from fluorescence data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112244
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  • 7
    Electronic Resource
    Electronic Resource
    Constitutive expression of the water deficit-inducible homeobox gene ATHB7 in transgenic Arabidopsis causes a suppression of stem elongation growth (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The Arabidopsis gene ATHB7 encodes a transcription factor of the homeodomain-leucine zipper class. The activity of the gene is dependent on the water conditions of the plant; expression being strongly induced in plants subjected to water deficit or to treatment with abscisic acid (ABA). In this report we demonstrate that ATHB7, when constitutively expressed at levels typical for plants exposed to water-deficit conditions, caused a reduction in elongation growth in the leaf and in the inflorescence stem. The reduction in stem growth mimics the effect on growth caused by water-deficit conditions, but is independent of water conditions in plants that express ATHB7 constitutively. These results indicate that ATHB7 in the wild-type plant may be a mediator of the plant growth response to limiting water conditions in the leaf and in the inflorescence stem. In support of this notion we also show that the ATHB7 promoter in wild-type plants exposed to water-deficit conditions is highly active in the elongating parts of the inflorescence stem as well as leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.01037.x
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  • 8
    Electronic Resource
    Electronic Resource
    High level histone H2A gene expression during early stages of adventitious bud formation in Norway spruce (Picea abies) (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 94 (1995), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We have demonstrated the correlation between cell division and the expression of a histone H2A-encoding gene, His2A, in Norway spruce. Picea abies (L.) Karst and used a cDNA clone in in situ hybridization experiments to monitor the cytokinin-induced cell division during early stages of adventitious bud development. A general stimulation of division of epidermal and cortical cells followed upon the cytokinin treatment. After two weeks in culture a high mitotic activity was detected only in single cells or small groups of cells in the epidermis and subepidermal cell layers. These cells presumably constitute the early stages of meristem primordia. The small clusters of dividing cells enlarge and subsequently form adventitious buds. Cells of the meristem and needle primordia of adventitious buds divide frequently as do the corresponding cells in vegetative buds. A quiescent center is distinguished within the apical meristem of vegetative buds. These cells, in the summit of the domed meristem, divide with a considerably lower frequency than cells in the flanking region. Differences in the temporal expression pattern of the histone H2A gene in cells of the vascular tissue, detected between embryos germinating in vitro and bud-induced embryos, suggest that the cytokinin treatment affects the timing of cell divisions in the differentiating procambium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1995.tb05301.x
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  • 9
    Electronic Resource
    Electronic Resource
    Inheritance of a bacterial hygromycin phosphotransferase gene in the progeny of primary transgenic pea plants (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 443-450 
    Details
    ISSN: 1432-2242
    Keywords: Transformation ; Pisum sativum ; Agrobacterium tumefaciens ; Regeneration ; Transgenic plants ; Progeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An analysis of the progeny of primary transgenic pea plants in terms of transmission of the transferred DNA, fertility and morphology is presented. A transformation system developed for pea that allows the regeneration of fertile transgenic pea plants from calli selected for antibiotic resistance was used. Expiants from axenic shoot cultures were co-cultivated with a nononcogenic Agrobacterium tumefaciens strain carrying a gene encoding hygromycin phosphotransferase as selectable marker, and transformed callus could be selected on callus-inducing media containing 15 mg/l hygromycin. After several passages on regeneration medium, shoot organogenesis could be reproducibly induced on the hygromycin resistant calli, and the regenerated shoots could subsequently be rooted and transferred to the greenhouse, where they proceeded to flower and set seed. The transmission of the introduced gene into the progeny of the regenerated transgenic plants was studied over two generations, and stable transmission was shown to take place. The transgenic nature of the calli and regenerated plants and their progeny was confirmed by DNA and RNA analysis. The DNA and ploidy levels of the progeny plants and primary regenerants were studied by chromosome analysis, and the offspring of the primary transformants were evaluated morphologically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229505
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  • 10
    Electronic Resource
    Electronic Resource
    A Double Multilayer Monochromator at an ESRF Undulator for Microbeam Experiments (1995)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 2 (1995), S. 124-131 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A water-cooled double W/Si-multilayer monochromator has been operated at an ESRF low-β undulator beam. For a fixed distance of the two multilayers the first-order Bragg reflection was at 8̃ keV. The peak power density of the beam at the exit of the multilayers was 1̃ W mm−2 and the flux density of the first order after a 10 μm collimator was 4 × 105 photons s−1 μm−2 mA−1. The performance of the beam in microbeam diffraction has been tested on a 20 μm W wire. The observed pseudo-Laue pattern is discussed with respect to the multilayer spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049595001592
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