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  • 1990-1994  (3)
  • 1993  (3)
  • 1H and 13C NMR  (1)
  • Drechslera tritici-repentis  (1)
  • Organic Chemistry
  • 1
    Digitale Medien
    Digitale Medien
    The influence of disease complexes involving Leptosphaeria (Septoria) nodorum on detection of resistance to three leaf spot diseases in wheat (1993)
    Springer
    Euphytica 72 (1993), S. 31-42 
    Details
    ISSN: 1573-5060
    Schlagwort(e): wheat ; Triticum aestivum ; resistance selection ; disease complexes ; pathogen mixtures ; septoria nodorum blotch ; Leptosphaeria nodorum ; septoria tritici blotch ; Mycosphaerella graminicola ; yellow spot ; tan spot ; Drechslera tritici-repentis ; Pyrenophora tritici-repentis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary In controlled inoculation studies with Septoria nodorum and Pyrenophora tritici-repentis, estimates of the relative proportion of each pathogen demonstrated differences in the responses of cultivars to pathogen mixtures that were not apparent from measurements of diseased leaf areas. Under field conditions estimates of the relative proportion of S. nodorum, P. tritici-repentis and S. tritici varied between field screening locations in Western Australian but also between lines within locations. Lines with known resistance to P. tritici-repentis and S. tritici, but susceptible to S. nodorum, could not be distinguished from susceptible lines on the basis of leaf area diseased or grain weight depression when S. nodorum was present in the disease complex. Such conditions, while suitable for the selection of combined resistance to these pathogens, were unsuitable for identifying resistance to individual pathogens. As symptoms were similar, the proportion of diseased leaf area sporulating with each pathogen provided a means of measuring the variation in disease development induced on lines varying in resistance. Knowledge of the components of disease and their relative importance were essential in understanding varietal response information under mixed infections of these leaf spot pathogens.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00023770
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Compounds with bridgehead nitrogen. Part 72For Part 71, see Ref. 1. - NMR spectra and stereochemistry of 8,9,10,11,11a,11b,12,13-octahydro-7aH-quino [1,2-c][1,3]benzoxazines and perhydropyrido [1,2-c][1,3]benzoxazines. NMR chemical shifts of methylene group protons adjacent to a nitrogen atom (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 505-508 
    Details
    ISSN: 0749-1581
    Schlagwort(e): Octahydro-7aH-quino[1,2-c][1,3]benzoxazines ; Perhydropyrido[1,2-c][1,3]benzoxazines ; 1H and 13C NMR ; Conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The positions of conformational equilibria in the four diastereoisomers of 8,9,11,11a,11b,12,13-octahydro-7aH-quino [1,2-c] [1,3] benzoxazines were investigated using 13C and 1H NMR spectroscopy. Comparison of the NMR chemical shifts of these isomers with those in the corresponding isomers of perhydropyrido [1,2-c] [1,3]benzoxazine shows the effect on NMR shifts of fusion of the aromatic ring on to the fully saturated system. The Δδ values are discussed in terms of degree of overlap of the nitrogen lone pair orbitals with the aromatic π-system.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260310516
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  • 3
    Digitale Medien
    Digitale Medien
    Confusion between dimethyl selenenyl sulfide and dimethyl selenone released by bacteria (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 7 (1993), S. 335-342 
    Details
    ISSN: 0268-2605
    Schlagwort(e): Bioremediation ; biodegradation ; dimethyl selenenyl sulfide ; biomethylation ; pathway ; chemiluminescence ; micro-organism ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Dimethyl selenone [(CH3)2SeO2] has been reported in the literature as a metabolite released by bacteria in contact with selenium metal or selenium salts. In this study, mass spectral, chromatographic, and boiling-point data are presented that show that dimethyl selenone has been confused with dimethyl selenenyl sulfide (CH3SeSCH3). In addition, the headspaces above monocultures of selenium-resistant bacteria were examined using gas chromatography followed by fluorine-induced chemiluminescence detection. A number of alkyl sulfur and selenium species were detected, along with dimethyl selenenyl sulfide. A pathway from oxidized selenium salts to reduced methylated selenides and dimethyl selenenyl sulfide is also presented.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590070507
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