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  • 1980-1984  (2)
  • 1955-1959
  • 4,6-dimethyl-3-nonanone  (1)
  • Demyelinated plaques  (1)
  • 1
    ISSN: 1432-1920
    Keywords: Demyelinated plaques ; Xenonenhanced CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Studies of xenon-enhanced CT for detecting cerebral demyelination have produced conflicting results. Therefore, we studied the effect of xenon inhalation on the CT appearance of five demyelinated plaques. The plaques and the surrounding white matter increased commensurately in attenuation during xenon inhalation. Therefore, xenon enhancement does not generally increase the sensitivity of CT for detecting cerebral demyelination.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 6 (1980), S. 895-903 
    ISSN: 1573-1561
    Keywords: Dasymutilla occidentalis ; Dasymutilla ; Timulla ; Pseudomethoca ; Smicromyrme ; Traumatomutilla ; Pappognatha ; Hymenoptera ; Mutillidae ; 4-methyl-3-heptanone ; 4,6-dimethyl-3-nonanone ; 4,6-dimethyl-3-octanone ; allomones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The mandibular gland secretion of the mutillid wasp,Dasymutilla occidentalis, possesses three short-chained ketones-4-methyl-3-heptanone (4MH), 4,6-dimethyl-3-nonanone (4,6DMN), 4,6-dimethyl-3-octanone (4,6DMO)—and several unidentified compounds. This is the first report of 4,6DMN as a natural product and its synthesis is described. These ketones, which are either known to be ant alarm pheromones or are structurally very similar to ant alarm pheromones, appear to function as allomones against ants, major potential predators of mutillid wasps. The major secretory component, 4-methyl-3-heptanone, which was identified in females and/ or males of the species analyzed within the generaDasymutilla, Timulla, Traumatomutilla, andPappognatha, appears to constitute a chemical character of the defensive secretions of these genera.
    Type of Medium: Electronic Resource
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