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  • 1
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 1 (1975), S. 363-428 
    ISSN: 0360-0572
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Sociology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Apical senescence ; Gibberellins ; Photomorphogenesis ; Pisum ; Senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In an early-flowering line of pea (G2) apical senescence occurs only in long days (LD), while growth in short days (SD) is indeterminate. In SD, G2 plants are known to produce a graft-transmissible substance which delays apical senescence in related lines that are photoperiod-insensitive with regard to apical senescence. Gibberellic acid (GA3) applied to the apical bud of G2 plants in LD delayed apical senescence indefinitely, while N6-benzyladenine and α-naphthaleneacetic acid were ineffective. Of the gibberellins native to pea, GA9 had no effect whereas GA20 had a moderate senescence-delaying effect. [3H]GA9 metabolism in intact leaves of G2 plants was inhibited by LD and was restored by placing the plants back in SD. Leaves of photoperiod-insensitive lines (I-types) metabolized GA9 readily regardless of photoperiod, but the metabolites differed qualitatively from those in G2 leaves. A polar GA9 metabolite, GAE, was found only in G2 plants in SD. The level of GA-like substances in methanol extracts from G2 plants dropped about 10-fold after the plants were moved from SD to LD; it was restored by transferring the plants back to SD. A polar zone of these GA-like materials co-chromatographed with GAE. It is suggested that a polar gibberellin is synthesized by G2 plants in SD; this gibberellin promotes shoot growth and meristematic activity in the shoot apex, preventing senescence.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2048
    Keywords: Apical senescence ; Pisum ; Photomorphogenesis ; Grafting ; Growth regulators ; Senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Apical senescence in an early flowering line of pea, G2, is greatly delayed by short days. This behavior is controlled by two dominant genes. Apical senescence of ungrafted, insensitive (I) lines is unaffected by photoperiod. When I-type scions with one of the two required genes were grafted onto G2, apical senescence of the I-type was delayed in short days, but not in long days. Flowering of the I-type was unaffected. The apex of the G2 stock was unaffected as well. Apical senescence of an I-type line lacking both photoperiod genes was not delayed when grafted on G2 in short days. It is concluded that G2 plants grown in short days produce a graft-transmissible factor which delays apical senescence of photoperiodically insensitive lines.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 267 (1989), S. 1108-1112 
    ISSN: 1435-1536
    Keywords: Analyticalultracentrifuge ; Schlieren optic ; photo electrical scanner ; diffusion measurement ; scientificsoftware
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Data obtained from experiments by use of an ultracentrifuge, are either given in the form of photos of the refractive index curve, or as registrations of the absorption-profiles, occurring within the cell, which are registered by differential records. Until now only sophisticated and time-consuming data analyses have been applied to measurements of diffusion and sedimentation coefficients by use of photos and records. For improving data handling the optical systems of the ultracentrifuge were computerized by using modern electric equipment. Schlieren photos are handled with a digitizer, scanner registrations by an AD-converter combined with a PC. Various programs are shown for further data acquisition. The specific software and the significant improvements resulting from this procedure, are discussed in the determination of diffusion coefficients.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 37 (1986), S. 101-102 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Detection of selective corrosion on stainless steel material no 1.4306 by radioisotope methods
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Nature of the Transition Metal Carbon-σ Bond. III. Phenylethinyl Metal Phthalocyanines of the First Transition SeriesAs well as the reaction of the anionic metal phthalocyanines Li2[MPc] ·6 THF (M = Cr, Ni, Cu, Zn) and Li[MnPc]·6 THF with alkyl iodides and experiments of a normal organylation by carbanionic addition with the metal phthalocyanines CrPcCl and MPc (M = Mn, Fe, Co, Ni, Cu, Zn) are runing by a relative quick electron transfer with no indications for formation of σ-organyl derivatives of the corresponding metal phthalocyanines.But with lithium or sodium phenylacetylide, respectively, the following phenylethinyl complexes could be prepared, whose mode of formation and constitution are discussed including some iron complexes already described in other connection: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm Li}\left[{\left({{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} } \right)_2 {\rm M}^{{\rm III}} {\rm Pc}} \right] \cdot {\rm xTHF}\left({{\rm M} = {\rm Cr,Co}} \right),} \hfill \\ {{\rm Li}\left[{{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm M}^{{\rm II}} {\rm Pc}} \right] \cdot 4,5{\rm THF,C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm Co}^{{\rm III}} {\rm Pc} \cdot {\rm 0,5THF,}} \hfill \\ {{\rm Li}_{\rm 2} \left[{{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm Co}^{{\rm II}} {\rm Pc}} \right]_2 \cdot 8{\rm THF,Na}\left[{{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm ZnPc}} \right] \cdot 5{\rm THF}} \hfill \\\end{array} $$\end{document}.
    Notes: Sowohl die Umsetzung der anionischen Metallphthalocyanine Li2[MPc] · 6 THF (M = Cr, Ni, Cu, Zn) und Li[MnPc] · 6 THF mit Alkyljodiden als auch Versuche einer normalen Organylierung durch Carbanionen-Addition mit den Metallphthalocyaninen CrPcCl und MPc (M = Mn, Fe, Co, Ni, Cu, Zn) verliefen unter einer relativ schnellen Elektronenübertragung ohne Anzeichen einer Bildung von σ-Organylderivaten der entsprechenden Metallphthalocyanine.Dagegen konnten mit Lithium- bzw. Natriumphenylacetylid die folgenden Phenyläthinyl-Komplexe dargestellt werden, deren Bildungsweise und Konstitution unter Einbeziehung einiger bereits in anderem Zusammenhang beschriebener Eisen-Komplexe zusammenfassend diskutiert wird: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm Li}\left[{\left({{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} } \right)_2 {\rm M}^{{\rm III}} {\rm Pc}} \right] \cdot {\rm xTHF}\left({{\rm M} = {\rm Cr,Co}} \right),} \hfill \\ {{\rm Li}\left[{{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm M}^{{\rm II}} {\rm Pc}} \right] \cdot 4,5{\rm THF,C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm Co}^{{\rm III}} {\rm Pc} \cdot {\rm 0,5THF,}} \hfill \\ {{\rm Li}_{\rm 2} \left[{{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm Co}^{{\rm II}} {\rm Pc}} \right]_2 \cdot 8{\rm THF,Na}\left[{{\rm C}_{\rm 6} {\rm H}_{\rm 5} {\rm C}_{\rm 2} {\rm ZnPc}} \right] \cdot 5{\rm THF}{\rm .}} \hfill \\\end{array} $$\end{document}
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 145-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Influence of Modification of γ-Alumina by Halides on the Acidic BehaviourThe influence of modification of γ-alumina by Cl and F on the acidic properties was studied by means of i.r. spectroscopic methods using ammonia as probe molecule. The measurements show a significant rise in Lewis acidity.
    Notes: Mittels IR-spektroskopischer Methoden wurde der Einfluß der Halogen-modifizierung auf das acide Verhalten von γ-Al2O3 im Hinblick auf dessen Verwendung als Träger in Reformingkatalysatoren untersucht. Als Sondenmolekül diente NH3. Die Messungen wiesen eine deutliche Verstärkung der Lewis-aciden Eigenschaften des modifizierten Al2O3 aus.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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