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  • cell cycle  (2)
  • ultrafine Pd particle  (2)
  • DCDPS  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Methanol synthesis from carbon monoxide and hydrogen catalyzed over Pd/CeO2 prepared by the deposition–precipitation method (2000)
    Springer
    Catalysis letters 64 (2000), S. 23-25 
    Details
    ISSN: 1572-879X
    Keywords: methanol synthesis ; palladium supported on ceria ; cationic palladium ; ultrafine Pd particle ; EXAFS of Pd ; XPS of Pd 3d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ceria‐supported palladium catalysts prepared by the deposition–precipitation method are highly active for the methanol synthesis from carbon monoxide and hydrogen in comparison with the catalyst prepared by the conventional impregnation method. Analyses by EXAFS show that palladium particles can be dispersed very well on the surface of ceria by both the methods, implying that the higher activity of the catalysts prepared by deposition–precipitation is not simply due to the particle size of palladium. Cationic palladium species are present in the samples prepared by deposition–precipitation after reduction with hydrogen at 300 °C, suggesting that the active species are produced by strong contact between palladium particles and the support.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019070516657
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal degradation of sulfone-containing polyarylates (1994)
    Springer
    Journal of polymer research 1 (1994), S. 211-214 
    Details
    ISSN: 1572-8935
    Keywords: Polyarylate ; Bisphenol-A ; DCDPS ; IPA ; TGA ; Thermal degradation ; Lifetime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Polyarylates were prepared from direct polycondensation of aromatic dicarboxylic acid such as 4,4'-dicarboxy diphenyl sulfone (DCDPS), isophthalic acid (IPA), and bisphenol-A (SPA) by means of ptoluenesulfonyl chloride and DMF in pyridine. We used thermogravimetric analysis to investigate the thermal decomposition of polyarylates and to determine kinetic parameters such as activation energy, preexponential factor and reaction order. Such information is useful for quick estimation of polymer lifetimes. Polyarylate derived from DCDPS-BPA has a longer lifetime than DCDPS/IPA-BPA or IPA-BPA at any given temperature, indicating that the former has better thermal stability than the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01374097
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  • 3
    Electronic Resource
    Electronic Resource
    Structural change of palladium particles supported on cerium oxide in catalytic methanol synthesis (2000)
    Springer
    Catalysis letters 68 (2000), S. 181-183 
    Details
    ISSN: 1572-879X
    Keywords: methanol synthesis ; palladium supported on ceria ; ultrafine Pd particle ; formation of Pd–O–Ce ; EXAFS of Pd K-edge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ultrafine palladium particles supported on cerium oxide by the coprecipitation method effectively catalyzes the methanol synthesis from carbon monoxide and hydrogen, while the catalytic activity increases in the initial stage. The Pd K-edge EXAFS (extended X-ray absorption fine structure) of the catalyst shows that a small part of palladium is still oxidized after the pretreatment with hydrogen at 573 K for 1 h. During the reaction the palladium particles in the catalyst are further oxidized due to the formation of Pd–O–Ce bonding which may stabilize the cationic palladium species being active to the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019099823810
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  • 4
    Electronic Resource
    Electronic Resource
    Protein complexes binding to cis elements of the plant histone gene promoters: multiplicity, phosphorylation and cell cycle alteration (1997)
    Springer
    Plant molecular biology 33 (1997), S. 367-379 
    Details
    ISSN: 1573-5028
    Keywords: cell cycle ; histone transcription ; Nicotiana tabacum BY2 ; trans-acting factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The S phase-specific expression of histone genes provides an interesting model for studying activation of gene transcription during the cell cycle. In plants, however, trans-acting factors responsible for histone gene transcription are poorly documented. Using combined gel shift, UV cross-linking and competition analysis, we carried out a systematic study to identify and characterize proteins binding with the previously established cis elements of the plant histone gene promoters. Nuclear extracts prepared from the highly synchronizable tobacco BY2 cells were used. We confirmed the presence of proteins binding to the hexamer (ACGTCA) motif which has been previously identified as the binding site of wheat HBP-1 proteins. Interestingly, multiple proteins were found to bind specifically with the nonamer (CAATCCAAC) element and their DNA-binding activity was abolished upon in vitro protein phosphatase treatment. This later result imply phosphorylation/dephosphorylation as a potential post-translational control for DNA-binding activity of nonamer-binding proteins. In addition, the DNA-binding activity of these nonamer-binding proteins was found to be positively correlated with the S phase-specific expression of the histone genes in the synchronized cells, suggesting their function in the activation of transcription during the G1/S transition. Finally, several proteins were observed to bind specifically with an A/T-rich hexamer (TAATAT) motif. Their DNA-binding activity, however, was insensitive to phosphatase activity in vitro and relatively constitutive during the cell cycle. This A/T-rich hexamer as a new cis-acting element of plant histone genes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005797104536
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  • 5
    Electronic Resource
    Electronic Resource
    Regulation of biosynthesis and cellular localization of Sp32 annexins in tobacco BY2 cells (1999)
    Springer
    Plant molecular biology 39 (1999), S. 361-372 
    Details
    ISSN: 1573-5028
    Keywords: calcium-dependent phospholipid-binding proteins ; cDNA ; cell cycle ; genomic organization ; immunolocalization ; TBY2 cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Annexins interact in a calcium-dependent manner with membrane phospholipids. Although their exact function is not known, annexins have been proposed to be involved in a variety of cellular processes. To determine whether plant annexins are implicated in cell division, we have isolated cDNAs encoding annexin from TBY2 cells. Based on sequence analysis, these cDNAs fall into two families, differing mainly by deletions or insertions in their 5′- and 3′- untranslated regions. The two annexins Ntp32.1 and Ntp32.2 encoded by these cDNAs are homologous to p32 from bell pepper (Cap32.1): we propose that these Solanaceae annexins constitute a distinct type which we call Sp32 annexins. There are two genes (Ntan.1 and Ntan.2) derived from the separate progenitor species of Nicotiana tabacum and analysis of Southern blots is consistent with the presence of these two genes. We show that Sp32 transcript amounts are developmentally modulated in tobacco plants: RNA levels are highest in growing and dividing tissues. Sp32 annexin gene expression is also regulated in TBY2 cultured cells: transcripts and proteins are detected only in exponentially growing cells. In synchronized TBY2 cells, Sp32 annexin transcripts are expressed at the G2/M transition, in the M phase and at the G1/S transition. These results are the first evidence that the expression of plant annexins is modulated during the cell cycle. The Sp32 annexin proteins accumulate during the cell cycle and peak at the end of mitosis. Immunolocalization shows that the majority of Sp32 annexins is present in intercellular junctions, forming a ring structure under the plasma membrane. Since annexins are known to bind secretory vesicles during exocytosis, their localization at cell junctions suggests that annexins could be involved in cell wall maturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006199814795
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