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  • 1
    Electronic Resource
    Electronic Resource
    Syntheses of iron(II) bis(pyridoxal isonicotinoylhydrazone)s and the in vivo iron-removal properties of some pyridoxal derivatives (1983)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 26 (1983), S. 298-302 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00356a037
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  • 2
    Electronic Resource
    Electronic Resource
    Dielectric properties of alumina/zirconia composites at millimeter wavelengths (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7667-7671 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alumina-zirconia composites with ZrO2 contents up to 20 wt % and negligible porosity were investigated at millimeter (mm) wavelengths to determine the changes appearing in the dielectric properties of pure alumina ceramics when unstabilized or partially stabilized ZrO2 is added to improve the mechanical strength. It is demonstrated that it is essential to distinguish between the contributions of the monoclinic and the tetragonal phase of zirconia (m-ZrO2, t-ZrO2). Permittivity is raised with increasing content of either phase; the effective permittivity can be assessed by the rule of mixtures (Maxwell–Garnett formulation of the generalized Clausius–Mossotti relation) using permittivity values of 10 for Al2O3, 14–21 for m-ZrO2, and 40–45 for t-ZrO2. The permittivity data show only a small variation in the investigated range of 9–145 GHz. For the dielectric loss, there is evidence of a predominant contribution of m-ZrO2; in addition, the marked increase in loss with frequency becomes sharper. The t-ZrO2, which is responsible for strengthening, does not show any significant influence on losses. It is therefore concluded that ZrO2 strengthening of alumina is feasible without affecting mm-wave losses at room temperature as long as the presence of m-ZrO2 is avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353963
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric property measurements of ZrO2-strengthened Al2O3 (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3257-3262 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ceramic composites of alumina and zirconia with ZrO2 contents up to 20 wt % and negligible porosity were investigated at radio frequencies from 104 to 107 Hz, and in a temperature range from 20 to 550 °C. If unstabilized or partially stabilized ZrO2 is dispersed in pure alumina in order to improve the mechanical strength the dielectric properties are changed. The admixture of zirconia leads to enhanced dielectric losses and an increased temperature dependence of the permittivity. It is demonstrated that it is essential to distinguish between the contributions of the monoclinic and the tetragonal phase of zirconia. The presence of the tetragonal ZrO2 phase is correlated with the appearance of two peaks in the temperature dependence of the dielectric loss and two smoothed steps in the temperature dependence of the permittivity. This is well described by a Debye model for dipole relaxation. The presence of the monoclinic phase leads to a higher exponential temperature rise for the dielectric loss as well as for the permittivity, due to an increased ionic conductivity. At higher frequencies the influence of ionic conductivity is smaller and the dipole relaxation processes are shifted to higher temperatures. Therefore, for high-frequency applications low-loss composites with improved mechanical properties can be realized if monoclinic zirconia is kept at low levels. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364158
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  • 4
    Electronic Resource
    Electronic Resource
    Photocontrol of plastid gene expression (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 11 (1988), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Recent strategies in the analysis of plastid gene expression at both the RNA and protein level are presented and current knowledge in this rapidly expanding research area is summarized. The role of transcriptional and post-transcriptional mechanisms in the expression of nuclear and organelle genes for plastid constituents is discussed, with emphasis on the control of these mechanisms by light. Available evidence points to species-specific, tissue-specific, and developmental stage-specific differences in the extent to which photoregulation is involved at each level of plastid gene expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1988.tb01356.x
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  • 5
    Electronic Resource
    Electronic Resource
    New Orally Effective Iron Chelators (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 612 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb24322.x
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  • 6
    Electronic Resource
    Electronic Resource
    Properties and subunit composition of RNA polymerase II from plant cell cultures
    Amsterdam : Elsevier
    BBA Section Nucleic Acids And Protein Synthesis 395 (1975), S. 337-346 
    Details
    ISSN: 0005-2787
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2787(75)90205-1
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  • 7
    Electronic Resource
    Electronic Resource
    A statistical study of narrow-band noise in NbSe"3
    Amsterdam : Elsevier
    Solid State Communications 65 (1988), S. 15-17 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(88)90577-7
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  • 8
    Electronic Resource
    Electronic Resource
    Shear creep and recovery of a technical polystyrene (1987)
    Springer
    Rheologica acta 26 (1987), S. 375-384 
    Details
    ISSN: 1435-1528
    Keywords: Torsional creep ; creep recovery ; time-temperaturesuperposition ; recoverable compliance ; polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The torsional creep and recoverable bahaviour of a technical polystyrene is reported over seven orders of magnitude of the value of the compliance from 10−8 to 10−1 Pa−1 and over more than seven decades in time. The results for the recoverable compliance JR (t) reveal a dispersion region seen between the glass transition and the steady-state recoverable compliance Je. The limiting value of the final dispersion Je = 4.7 · 10−4 Pa−1 indicates a broad molecular-weight distribution. The steady-state recoverable compliance Je is independent of the temperature. The temperature dependence of the final dispersion was found to be indistinguishable from that of viscous flow. However, this temperature dependence differs significantly from that of the glass-rubber transition. A proposal has been made for the construction of creep compliance and recoverable compliance over an extended time scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332257
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  • 9
    Electronic Resource
    Electronic Resource
    1β-Hydroxylation ofd-norgestrel and norethisterone byBotryodiploadi malorum (1974)
    Springer
    Cellular and molecular life sciences 30 (1974), S. 328-329 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die mikrobiologische 1β-Hydroxylierung vond-Norgestrel und Norethisteron durch den MikroorganismusBotryodiplodia malorum wird beschrieben. Ausserdem wurde 11β-Hydroxynorethisteron isoliert und charakterisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01921644
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  • 10
    Electronic Resource
    Electronic Resource
    Regulatory factors involved in gene expression (subunits of ribulose-1,5-bisphosphate carboxylase) in mustard (Sinapis alba L.) cotyledons (1986)
    Springer
    Planta 169 (1986), S. 260-266 
    Details
    ISSN: 1432-2048
    Keywords: Gene expression ; Phytochrome ; Plastidic factor ; Ribulose-1,5-bisphosphate carboxylase ; Sinapis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytochrome-controlled appearance of ribulose-1,5-bisphosphate carboxylase (RuBP-Case) and its subunits (large subunit LSU, small subunit SSU) was studied in the cotyledons of the mustard (Sinapis alba L.) seedling. The main results were as follows: (i) Control of RuBPCase appearance by phytochrome is a modulation of a process which is turned on by an endogenous factor between 30 and 33 h after sowing (25° C). Only 12 h later the process begins to respond to phytochrome. (ii) The rise in the level of RuBP-Case is the consequence of a strictly coordinated synthesis de novo of the subunits. (iii) While the levels of translatable mRNA for SSU are compatible with the rate of SSU synthesis the relatively high LSU mRNA levels are not reflected in the rates of in-vivo LSU or RuBPCase syntheses. (iv) Gene expression is also abolished in the case of nuclear-encoded SSU if intraplastidic translation and concomitant plastidogenesis is inhibited by chloramphenicol, pointing to a “plastidic factor” as an indispensable prerequisite for expression of the SSU gene(s). (v) Regarding the control mechanism for SSU gene expression, three factors seem to be involved: an endogenous factor which turns on gene expression, phytochrome which modulates gene expression, and the plastidic factor which is an indispensable prerequisite for the appearance of translatable SSU mRNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392323
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