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  • Halotydeus destructor  (3)
  • free isoflavones  (2)
  • Computed tomography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Aspergillosis of the paranasal sinuses (1992)
    Springer
    Neuroradiology 34 (1992), S. 520-523 
    Details
    ISSN: 1432-1920
    Keywords: Computed tomography ; Paranasal sinuses ; Fungus ; Aspergillosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The CT appearances of 13 cases of pathologically proven aspergillosis involving paranasal sinuses were reviewed. Symptoms included rhinorrhea, nasal obstruction, headache, facial pain and foul smell from the nose. At operation, these lesions appeared yellowish, brownish, grey or black in colour, and contained dirty or muddy material. Microscopic examination of the tissue removed showed anAspergillus ball with chronic inflammation but without invasion of the nasal or sinus mucosa in 6 cases, and tissue invasion with necrosis and inflammation in 7. The structures involved, in order of frequency, were: maxillary sinus, nasal cavity, ethmoid sinus, orbit and cavernous sinus. The orbit was involved in 2 cases, therefore categorized as invasive; the other 11 cases were non-invasive as judged by CT. Calcification was seen in the lesions of 9 cases. In most cases the adjacent bony structures showed areas of erosion and sclerosis. Aspergillosis should be suspected in the presence of a mass in the paranasal sinuses or nasal cavity with calcification within it, which may not appear solid or dense and is separate from the walls of the sinus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00598965
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  • 2
    Electronic Resource
    Electronic Resource
    Role of Alkaloids in Resistance of Yellow Lupin to Red-Legged Earth Mite Halotydeus destructor (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 429-441 
    Details
    ISSN: 1573-1561
    Keywords: Lupinus luteus ; Halotydeus destructor ; plant resistance ; deterrent activity ; quinolizidine alkaloids ; ammodendrine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Eleven varieties of Lupinus luteus were tested in choice and no-choice experiments for their resistance to feeding by the red-legged earth mite (Halotydeus destructor). Three were found to show resistance, and the alkaloid fraction from these varieties strongly deterred mites from feeding. The alkaloid components of the extracts, lupinine, a number of acyl derivatives of lupinine, and sparteine were tested for deterrent activity. Sparteine was the most potent, with significant activity at 0.001% concentration. Quantitation of the levels of nonpolar alkaloids in the cotyledons and leaves of the 11 varieties was by gas chromatography–mass spectrometry. An inverse correlation was found between the concentrations of these alkaloids and the damage caused by the mites; varieties with levels 〈100 μg/g (fresh wt) showed a high damage index. The involvement of sparteine and the bipiperidine alkaloid ammodendrine in the deterrence to mite feeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005413606680
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Role of Isoflavonoids in Resistance of Subterranean Clover Trifoliates to the Redlegged Earth Mite Halotydeus destructor (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 2089-2100 
    Details
    ISSN: 1573-1561
    Keywords: Trifolium subterraneum ; trifoliates ; Halotydeus destructor ; free isoflavones ; bound isoflavones ; resistance ; deterrent activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Mature leaves of variety SE014 of Trifolium subterraneum are resistant to the redlegged earth mite (Halotydeus destructor). Compounds with feeding deterrent activity present in the leaves were isolated and identified by using a membrane bioassay technique. The free isoflavones, formononetin, genistein, and biochanin A, their corresponding 7-O-glucosides, and biochanin A 7-O-glucoside-6″-O-malonate and genistein 7-O-glucoside-6″-O-malonate, were active. In addition, the biosynthetic precursors of formononetin and genistein, 2,5,7-trihydroxy-4′-methoxyisoflavanol and 2,5,7,4′-tetrahydroxyisoflavanol, also were deterrent to the redlegged mites. The relative activity of these compounds was determined and some structure-activity correlations are noted. The constitutive defense mechanism that contributes to the resistance of subclover trifoliates to the mite contrasts with the induced chemical mechanism previously found for subterranean clover cotyledons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020789710706
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Levels of Isoflavonoids as Indicators of Resistance of Subterranean Clover Trifoliates to Redlegged Earth Mite Halotydeus destructor (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 795-803 
    Details
    ISSN: 1573-1561
    Keywords: Trifolium subterraneum ; trifoliate leaves ; Halotydeus destructor ; free isoflavones ; bound isoflavones ; plant resistance ; deterrent activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The extracts, obtained with methanol from crushed trifoliates and from the surface layer of the trifoliates, contained isoflavones in both the free and bound forms as the major components, compounds known to exhibit feeding deterrence towards the redlegged earth mite. The levels of these compounds were quantified and showed considerable variation in extracts of one susceptible variety and four varieties with differing levels of resistance. The relative resistance of the five varieties established from field observations was compared with the amounts of isoflavone derivatives obtained in the two extracts. A better ranking of resistance was found with levels of isoflavones on the leaf surface than with the total amount of isoflavones in the trifoliates. These results suggest a simple method for determining the relative resistance of subterranean clover to the mite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020840616583
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    Paper (German National Licenses)
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