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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 177 (1991), S. 27-38 
    ISSN: 1615-6110
    Keywords: Angiosperms ; Caryophyllaceae ; Moehringia intricata ; Taxonomy ; morphology ; Flora of S. Spain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The new taxonMoehringia intricata subsp.giennensis, from the calcareous mountains of the south-eastern Iberian Peninsula is described. A comparative morphological study with regard to the most closely related taxa, contributes information of leaf anatomy, seed and pollen morphology, ecology and distribution.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2048
    Keywords: Age (pea root) ; Lectin (pea root) ; Nitrate (nodulation) ; Nodule ; Pisum (root lectin) ; Root lectin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Root lectins are believed to participate in the recognition between Rhizobium and its leguminous host plant. Among other factors, testing this hypothesis is difficult because of the very low amounts in which root lectins are produced. A double-antibody-sandwich enzyme-linked immunoassay, was used to determine nanogram quantities of pea lectin in root slime and salt extracts of root cell-wall material when pea seedlings were 4 and 7 d old. In addition, a critical NO 3 - concentration (20 mM) which inhibited nodulation was found, and the lectin present in root slime and salt extracts of root cell walls of 4- and 7-d-old peas supplied with 20 mM NO 3 - was comparatively determined. With the enzyme-linked immunoassay, lectin quantities ranging between 20 and 100 nanograms could be determined. The assay is not affected by monomeric mannose and glucose (pealectin haptens). The slime of the 4-d-old roots contained more lectin than the slime of the 7-d-old roots. Salt-extractable, cell-wall-associated lectin accumulated in the older roots. Nitrate affected slime and cell-wall production, and the extractability of cell-wall material in both age groups. The presence of NO 3 - increased lectin in the slime, most notably in the younger roots; the relative amount of lectin in the slime was almost doubled. The cell-wall-associated, salt-extractable lectin decreased two- to threefold compared with the control group.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sulfenamide als Liganden in der Übergangsmetall-Chemie. Pentacarbonyl(Sulfenamid)-Chrom(0)-KomplexeDie Komplexe Cr(CO)5(R′SNR2) [R′ = CH3; NR2 = N(CH3)2, N(C4H8)O; R′ = C6H5; NR2 = N(CH3)2, N(C4H4)O, N(CH2—C6H5)2, N(C6H11)2] werden durch Reaktionen der Sulfenamide mit Cr(CO)5 · THF hergestellt und mittels analytischer und spektrometrischer Methoden charakterisiert. Die IR-, 1H-NMR-, UV-VIS- bzw. Massenspektra deuten auf eine Koordination via Schwefelatom hin. Die aus IR- und UV-VIS-Daten erhaltenen π-Akzeptoreigenschaften der Sulfenamide in den Komplexen werden mit denen anderer divalenter Schwefel-Verbindungen verglichen.
    Notes: The complexes Cr(CO)5(R′SNR2) [R′ = CH3; NR2 = N(CH3)2, N(C4H8)O. R′ = C6H5; NR2 = N(CH3)2, N(C4H4)O, N(CH2—C6H5)2, N(C6H11)2] have been prepared by reaction of the sulfenamides with Cr(CO)5 · THF and characterized by analytical and spectroscopic methods. The IR, 1H-NMR, UV-VIS, and mass spectra of the complexes support the coordination of the sulfenamide via the sulfur atom. π-acceptor abilities of sulfenamides in the prepared coordination compounds, determined from IR and UV-VIS data, were compared with those of other divalent sulfur conpounds.
    Additional Material: 1 Ill.
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  • 5
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have examined the kinetics and mechanism of the dediazoniation reaction of p-methylbenzenediazonium tetrafluoroborate in the presence and absence of CuCl2 using a methodology developed by us that allows, simultaneously, and within the same experiment to identify, to quantify, and to obtain the rate constants for the formation of all dediazoniation products, and, indirectly, the rate constant for the diazonium salt decomposition. The methodology developed combines the use of coupling reactions, to form a stable azo dye, followed by analysis by HPLC. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet 30: 31-39, 1998.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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