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  • 2005-2009
  • 1980-1984  (4)
  • 1970-1974
  • 1982  (4)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 557-559 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The structure of the rotor is shown schematically in Fig. 1; it has an axis of rotation on which rests a float and three transverse bars to which blades (or vanes) are attached with wax. The axis and transverse bars are made of glass capillaries. The blades at each end of the transverse bars ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Mutant (Rhizobium) ; Nodulation ; Capsule (bacterial) ; Lectin ; Polysaccharide ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spontaneous mutants with altered capsule synthesis were isolated from a marked strain of the symbiont,Rhizobium japonicum. Differential centrifugation was used to enrich serially for mutants incapable of forming capsules. The desired mutants were detected by altered colony morphology and altered ability to bind host plant lectin. Three mutants failed to form detectable capsules at any growth phase when cultured in vitro or in association with the host (soybean,Glycine max (L.) Merr.) roots. These mutants were all capable of nodulating and attaching to soybean roots, indicating that the presence of a capsule physically surrounding the bacterium is not required for attachment or for infection and nodulation. Nodulation by several of the mutants was linearly proportional to the amount of acidic exopolysaccharide that they released into the culture medium during the exponential growth phase, indicating that such polysaccharide synthesis is important and perhaps required for nodulation. Two of the mutants appeared to synthesize normal lectin-binding capsules when cultured in association with host roots, but not when cultured in vitro. Nodulation by these mutants appeared to depend on how rapidly after inoculation they synthesized capsular polysaccharide.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 61 (1982), S. 113-116 
    ISSN: 1432-2242
    Keywords: Clonal selection ; Euphorbia millii ; Anthocyanin ; Cell-pedigree ; Cultured cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A high pigment-producing strain of cultured Euphorbia millii cells was isolated by clonal selection. The pigment obtained was red and consisted mainly of anthocyanin. The amount of this pigment obtained after 24 selections was seven times that found in the original cells. Statistical and cell-pedigree analyses proved that this cell strain has stable productivity for this red pigment.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 310 (1982), S. 234-238 
    ISSN: 1618-2650
    Keywords: Best. von Tributylzinnchlorid, Dibutylzinndichlorid ; Polarographie, Differential-Puls ; Fischernetz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The pulse-polarographic behaviour of tributyltin chloride (TBTC) and dibutyltin dichloride (DBTC) in ethanol-water mixtures has been studied. The effects of temperature, pH, modulation amplitude, solvent and supporting electrolyte compositions were investigated. The reduction processes are complicated and pH-dependent. DBTC gave one reversible reduction wave and TBTC showed a quasi-reversible one and also several irreversible waves. Both the organotin compounds in the concentration of 10−7 mol/l were determined by differential pulse polarography. The method was successfully applied to the analysis of commercially available fishing nets. Detection limits were 2.2×10−7 and 6.2×10−8 mol/l for TBTC and DBTC, respectively.
    Notes: Zusammenfassung Das puls-polarographische Verhalten von Tributylzinnchlorid (TBTC) und Dibutylzinndichlorid (DBTC) in Ethanol-Wasser-Gemischen wurde untersucht und die Wirkung von Temperatur, pH, Modulationsamplitude sowie Zusammensetzung des Lösungsmittels und Leitelektrolyts geprüft. Die Reduktionsprozesse waren kompliziert und abhÄngig vom pH. DBTC ergab eine reversible Reduktionswelle, TBTC eine quasireversible Welle, sowie daneben einige irreversible Wellen. Beide Organozinnverbindungen konnten in einer Konzentration von 10−7 mol/l durch Differential-Puls-Polarographie bestimmt werden. Die Methode wurde erfolgreich auf die Analyse von handelsüblichen Fischernetzen angewandt. Die Nachweisgrenzen lagen bei 2,2·10−7 (TBTC) bzw. 6,2 · 10−8 mol/l (DBTC).
    Type of Medium: Electronic Resource
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