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  • Electronic Resource  (5)
  • Chemistry  (4)
  • Blended stationary phases  (1)
  • Germination (embryo)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Intracellular levels of polyadenylated RNA and loss of vigour in germinating wheat embryos (1982)
    Springer
    Planta 156 (1982), S. 413-420 
    Details
    ISSN: 1432-2048
    Keywords: Embryo vigour ; Germination (embryo) ; Poly(A) RNA ; Vigour (seed) ; Triticum (seed vigour)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Polyadenylated-RNA (Poly(A)+RNA) levels have been studied during the germination of wheat embryos of high viability but differing vigour. In high-vigour embryos imbibed at 20°C the level of poly(A)+RNA falls dramatically over the first hour of imbibition, then remains constant up to 3 h of imbibition before increasing rapidly to a level similar to that found in the quiescent state by 7 h of imbibition. Median-vigour embryos imbibed at 20°C show similar changes in poly(A)+RNA content but the initial decrease and subsequent increase in poly(A)+RNA levels are less marked. On imbibition at 10°C, the poly(A)+RNA content in high-vigour embryos decreases to a lesser extent during the first hour than at 20°C and the level increases more slowly over the next 6 h than during the same time period at 20°C. The level of poly(A)+RNA in medianvigour embryos remains constant over the first 4 h of germination and then falls to a level of about half that found in quiescent high-vigour embryos. Polyacrylamide gel electrophoresis of total-RNA samples shows that the polyadenylic acid (poly(A)) sequences occur in RNA species ranging in size from 35-7S. Polyacrylamide gel electrophoresis of isolated poly(A) sequences demonstrates the presence of two size classes of poly(A) in quiescent embryos, but at 20°C a more heterodisperse pattern appears by 2 h of imbibition. At 10°C, two size classes of poly(A) persist throughout the period studied in both high- and median-vigour embryos, although in median-vigour embryos the ratio of larger: smaller poly(A)-tail sizes decreases more rapidly than in high-vigour embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393312
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of gas-chromatographic glass capillary columns of high efficiency with liquid crystal stationary phases (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 355-356 
    Details
    ISSN: 0935-6304
    Keywords: Gas-liquid chromatography (GLC) ; Open tubular glass capillary columns ; Blended stationary phases ; Liquid crystals ; Polycyclic aromatic hydrocarbons (PAH) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030710
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-pressure solution reservoir for fabrication of capillary columns of reduced internal diameter (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 444-445 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Open-tubular columns ; Reduced diameter ; High pressure ; Coating reservoir ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240060810
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  • 4
    Electronic Resource
    Electronic Resource
    The rate of the reaction of OH with HCl (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 16 (1984), S. 1151-1160 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The absolute rate constant for the OH + HCl reaction has been measured from 240 to 295 K utilizing the techniques of laser/flash photolysis-resonance fluorescence. The HCl concentrations were monitored continuously by ultraviloet and infrared spectrophotometry. The results can be fit to the following Arrhenius expression: \documentclass{article}\pagestyle{empty}\begin{document}$$k_1 = (4.6{\rm } \pm {\rm }0.3){\rm } \times {\rm }10^{ - 12} \exp [- (500{\rm } \pm {\rm }60)/T{\rm cm}^3 /{\rm molecule} \cdot {\rm s}$$\end{document} The rate constant values obtained in this study are 20-30% larger than those recommended previously for modeling of stratospheric chemistry.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550160910
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics of the reaction of OH with pernitric and nitric acids (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 16 (1984), S. 41-55 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The absolute rate constants for the reactions of OH + HO2NO2 (1) and OH + HNO3 (2) have been measured with the technique of flash photolysis resonance fluorescence over the temperature ranges of 240-330 K at 760 torr He for reaction (1) and of 240-370 K at 50 and 760 torr He for reaction (2). Reactant concentrations were monitored continuously by ultraviolet and infrared spectrophotometry. The data can be fitted to the following Arrhenius expressions: \documentclass{article}\pagestyle{empty}\begin{document}$$ k_1 = \left( {5.9 \pm 0.4} \right) \times 10^{ - 13} \exp \left[ {{{\left( {650 \pm 30} \right)} \mathord{\left/ {\vphantom {{\left( {650 \pm 30} \right)} T}} \right. \kern-\nulldelimiterspace} T}} \right]{{{\rm cm}^{\rm 3} } \mathord{\left/ {\vphantom {{{\rm cm}^{\rm 3} } {{\rm molecule} \cdot {\rm s}}}} \right. \kern-\nulldelimiterspace} {{\rm molecule} \cdot {\rm s}}} $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm CH}_{\rm 3} {\rm SiD}_{\rm 3} \mathop {\longrightarrow} \limits^3 {\rm CH}_{\rm 2} \raise1pt\hbox{=\kern-3.45 pt=} {\rm SiD}_{\rm 2} \left( {0.14} \right) $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ k_2 = \left( {8.3 \pm 0.9} \right) \times 10^{ - 15} \exp \left[ {{{\left( {850 \pm 40} \right)} \mathord{\left/ {\vphantom {{\left( {850 \pm 40} \right)} T}} \right. \kern-\nulldelimiterspace} T}} \right]{{{\rm cm}^{\rm 3} } \mathord{\left/ {\vphantom {{{\rm cm}^{\rm 3} } {{\rm molecule} \cdot {\rm s}}}} \right. \kern-\nulldelimiterspace} {{\rm molecule} \cdot {\rm s}}} $$\end{document} These results are in very good agreement with recent studies of reaction (2), and also of reaction (1) at 295 K.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550160107
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