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  • PACS: 68.35.Bs; 68.55.Jk; 61.16.Ch  (1)
  • Receptor  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscopy of the GaN(000 〈 ![IGNORE[$\bar{1}$]] ) surface (1998)
    Springer
    Applied physics 66 (1998), S. S947 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35.Bs; 68.55.Jk; 61.16.Ch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: ) surface. Four dominant reconstructions have been observed: 1×1, 3×3, 6×6, and c(6×12). The 1×1 structure is formed by annealing the as-grown GaN surface to desorb excess Ga atoms. The higher-order reconstructions are formed by depositing sub-monolayer quantities of Ga atoms onto this 1×1surface. STM images showing the details of the reconstructions are presented and results of quantitative measurements of the number of Ga atoms required to form the various reconstructions are reported. Structural models are compared with the STM data. Reversible order/disorder phase transitions and adatom motion on the GaN surface are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051272
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear and chloroplast cytokinin-binding proteins from barley leaves participating in transcription regulation (2000)
    Springer
    Plant growth regulation 32 (2000), S. 329-335 
    Details
    ISSN: 1573-5087
    Keywords: Cytokinins ; Cytokinin-binding protein ; Receptor ; Transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The 67 cytokinin-binding protein (CBP) previously isolated from the cytosol of mature leaves of 10-day-old barley seedlings has now been purified from nuclei isolated from the same leaves. The procedure of CBP isolation included protein purification by Sephadex G-50, hydrophobic chromatography on phenyl-Sepharose and affinity chromatography on zeatin-Sepharose. Interaction of trans-zeatin with the nuclear protein was demonstrated by the ELISA technique based on cytokinin competition with anti-idiotype antibodies (raised against antibodies to trans-zeatin) for complex formation with the protein immobilized on polystyrene microtiter plates. Nuclear 67 protein in concert with trans-zeatin activated transcription elongation in vitro in systems containing chromatin associated with RNA polymerase I or nuclei isolated from barley leaves. Nuclear 67 protein had no effect on the chloroplast transcription system. A 64 CBP was isolated from chloroplasts of barley leaves by the same procedure as that used for CBP isolation from nuclei. The cytokinin-binding properties of the chloroplast protein were demonstrated by competition of trans-zeatin with Aba-i in complex formation with the protein in ELISA. Chloroplast CBP activated RNA synthesis markedly in chloroplast lysate without any effect on transcription in the chromatin-containing system. Therefore both nuclear and chloroplast transcription machineries are regulated by cytokinins by means of special nuclear and chloroplast cytokinin-binding proteins which can be considered cytokinin receptors with the properties of transfactors regulating the elongation phase of transcription.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010783212459
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    Paper (German National Licenses)
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