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  • 1
    Electronic Resource
    Electronic Resource
    Intracranial lipomas (1991)
    Springer
    Acta neurochirurgica 110 (1991), S. 124-128 
    Details
    ISSN: 0942-0940
    Keywords: Computed tomography ; intracranial lipoma ; magnetic resonance imaging ; surgical management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intracranial lipomas are very rare, probably congenital lesions. Though they can occur anywhere in the intracranial space, a good proportion of cases tend to be located around the midline. Review of the literature as well as our own three cases — which forms the basis of this article — shows that they are mostly asymptomatic. When symptoms occur, they are frequently the result of coexisting general clinical conditions. Lipomas used to be reported mainly as incidental findings at autopsy. Advances in neuro-imaging techniques have vastly improved the likelihood of their being discovered during life. At present however, significant increase in the reported incidence of these tumours is yet to be seen. Surgical extirpation of the tumour is not considered necessary in the majority of patients, many of whom show remarkable clinical improvement following shunt procedures for obstructive hydrocephalus as well as treatment of coexisting conditions such as epilepsy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400679
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  • 2
    Electronic Resource
    Electronic Resource
    The significance of periventricular lucency on computed tomography: Experimental study with canine hydrocephalus (1981)
    Springer
    Neuroradiology 20 (1981), S. 221-227 
    Details
    ISSN: 1432-1920
    Keywords: Computed tomography ; Hydrocephalus ; Periventricular lucency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to investigate the pathogenesis of periventricular lucency (PVL) in hydrocephalus, CT scans were performed with monitoring of the epidural pressure in a series of dogs with hydrocephalus induced with kaolin. PVL of various degrees was detected in the experimental animals, which disappeared immediately after a shunting operation. Correlations have been attempted between PVL on CT scans and histological examinations, contrast enhancement studies, metrizamide ventriculography, and measurement of regional cerebral blood flow in the periventricular white matter. PVL in hydrocephalus is considered to represent acute edema or chronic CSF retention in the periventricular white matter caused by an increase of water content. In other words, it is regarded as a sign of existing or preceding intraventricular hypertension on CT scan, and seems to be a reversible phenomenon to some extent. PVL may therefore became an indication for a shunt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342088
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sex-specific activity of (R)-(−)- and (S)- (+)-1,7-dioxaspiro[5.5]undecane, the major pheromone ofDacus oleae (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 1559-1568 
    Details
    ISSN: 1573-1561
    Keywords: Dacus oleae ; olive fruit fly ; Diptera ; Tephritidae ; pheromones ; enantiomers ; sex attractants ; sex-specific enantiomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract 1,7-Dioxaspiro[5.5]undecane (olean), the major component of the female sex attractant pheromone blend of the olive fruit flyDacus oleae (Gmelin) was shown to be released as a racemate. The response of males and females to pure (R)-(−) and (S)-(+)-enantiomers was tested under laboratory and field conditions. Males in laboratory and field tests responded only to (R)-(−)-olean, which functions as a sex attractant. Females responded only to (S)-(+)-olean in laboratory tests but not in the field. There are indications that the latter enantiomer fuctions as a short-range arrestant throughout the day and as an aphrodisiac in the process of mating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012372
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  • 4
    Electronic Resource
    Electronic Resource
    Dendroctonus pseudotsugae hopkins (Coleoptera: Scolytidae): Production of and response to enantiomers of 1-methylcyclohex-2-en-1-ol (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 1201-1208 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonus pseudotsugae ; Douglas-fir beetle ; Coleoptera ; Scolytidae ; aggregation pheromone ; production ; response ; methylcyclohexenol ; seudenol ; enantiomers ; trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Female Douglas-fir beetles,Dendroctonus pseudotsugae, produced an average 45∶55 mixture of the (S)-(−)- and (R)-(+)-enantiomers of 1-methylcyclohex-2-en-1-ol (MCOL). The (S)-(−)∶(R)-(+) ratio of 3-methylcyclohex-2-en-1-ol (seudenol) produced by this population of females was 34∶66. Lindgren funnel traps baited with (R)-(+)-MCOL attracted significantly more males and females than (S)-(−)-MCOL-baited traps, which captured significantly more beetles than unbaited controls. The combined effect of the enantiomers was additive, rather than synergistic. Either enantiomer of MCOL increased catches by frontalin-baited traps. Racemic MCOL can be used for trapping Douglas-fir beetles in south-central British Columbia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980074
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  • 5
    Electronic Resource
    Electronic Resource
    Species discrimination in five species of winter-flying geometrids (Lepidoptera) based on chirality of semiochemicals and flight season (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2721-2735 
    Details
    ISSN: 1573-1561
    Keywords: Chirality ; enantiomers ; sex pheromones ; (3Z,9Z)-(6R,7S)-epoxynonadecadiene ; (3Z,9Z)-(6S,7R)-epoxynonadecadiene ; (6Z,9Z)-(3S,4R)-epoxynonadecadiene ; Colotois pennaria ; Erannis defoliaria ; Agriopis aurantiaria ; A. marginaria ; A. leucophearia ; Lepidoptera ; Geometridae ; electroantennogram ; field trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Enantiomer separation of (6Z,9Z)-cis-3,4-epoxynonadecadiene and (3Z,9Z)-cis-6,7-epoxynonadecadiene could be achieved using chiral high-resolution gas chromatography and a cyclodextrin-bond column. (3Z,9Z)-(6R,7S)-Epoxynonadecadiene was identified from ovipositor extracts ofColotois pen-Naria, while inErannis defoliaria the 6S,7R-enantiomer was found. In field trapping tests pure synthetic enantiomers caught only conspecific males of these species. (3Z,6Z,9Z)-Nonadecatriene was found in both species, while the presence of (3Z,6Z,9Z)-heneicosatriene was indicated inC. Pennaria only. A 10∶10∶3 blend of (3Z,9Z)-(6R,7S)-epoxynonadecadiene, (3Z,6Z,9Z)-heneicosatriene, and (3Z,6Z,9Z)-nonadecatriene was found to be optimal for catchingC. Pennaria, whileE. Defoliaria males were optimally caught by a 1∶1 mixture of (3Z,9Z)-(6S,7R)-epoxynonadecadiene and (3Z,6Z,9Z)-nona-decatriene. (6Z,9Z)-(3S,4R)-Epoxynonadecadiene was identified from ovipositor extracts ofAgriopis (Erannis) aurantiaria. In field tests the pure enantiomer proved to be a highly specific sex attractant for both the late autumn/early winter flyingA. Aurantiaria and the late winter/early spring flyingA. Leucophearia. Males ofAgriopis marginaria, which fly in late winter/early spring, were attracted to (3Z,9Z)-(6S,7R)-epoxynonadecadiene. The addition of (3Z,6Z,9Z)-nonadecatriene to theS,R-enantiomer increased captures. Optimal catches were recorded with a 10∶3 epoxide-hydrocarbon blend. Enantiomer specificity in all species was confirmed in EAG measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980703
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