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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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    Paper (German National Licenses)
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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 Pheromone of Glossina tachinoides: Isolation, Identification, and Synthesis (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 1563-1575 
    Details
    ISSN: 1573-1561
    Keywords: Tsetse fly ; sex stimulant ; pheromone ; hydrocarbon ; methylalkanes ; gas chromatography ; Diptera ; biting fly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Study of lipids from male and female laboratory-reared flies led to the demonstration of a potent contact sex stimulant in extracts and cuticular hydrocarbons of the female tsetse fly Glossina tachinoides (Westwood) against conspecific males. Thin-layer and column chromatography indicated that extracts contained hydrocarbons and saponifiable lipids. Biological activity was found in the alkanes from females, including prominent branched-chain alkanes that were detected by gas chromatography (GC). The alkanes were separated and collected by preparative gas chromatography (GC), and only the 37-carbon region showed biological activity. GC–mass spectrometry showed the major peak contained a mixture of isomeric 11,23-, 13,25- plus a minor amount of 11,21-dimethylheptatriacontane. Two racemic isomers were synthesized, and bioassays showed that the greatest activity was possessed by the 11,23- isomer with somewhat less activity in 13,25-dimethyl heptatria-contane. Dose–response data showed ED50 at 5 μg per decoy with solvent-washed males, nonspecific females, or corks as decoys. These alkanes released sexual activity in males that comprised most of the behaviors released by a female fly of the same species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020967918594
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  • 4
    Electronic Resource
    Electronic Resource
    Absolute configuration of mosquito oviposition attractant pheromone, 6-acetoxy-5-hexadecanolide (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 643-648 
    Details
    ISSN: 1573-1561
    Keywords: Mosquito ; Culex pipiens fatigans ; Diptera ; Culicidae ; oviposition ; attractant ; pheromone ; chiral chromatography ; acetoxyhexadecanolide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract 6-Acetoxy-5-hexadecanolide (Ia) in the oviposition attractant pheromone released from egg apical droplets of the mosquitoCulex pipiens fatigans Wied. is shown to be the (−)-(5R,6S)- enantiomer. Identification was by chromatography of the 6-trifluoroacetoxy derivatives of the natural pheromone and of the synthetic (−)-(5R,6S)- (Ib) and (+)-(5S,6R)- (IIb) enantiomers on a capillary column having a chiral stationary phase comprising a derivative of (1S,3S)-chrysanthemic acid. The synthetic (−)-(5R,6S)- enantiomer (Ia) attracted oviposition of four fold more mosquito egg rafts than the control (P 〈 0.01) whereas for the (5S,6R)- enantiomer (IIa) there was no statistically significant oviposition attraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988573
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  • 5
    Electronic Resource
    Electronic Resource
    Southern pine beetle: Olfactory receptor and behavior discrimination of enantiomers of the attractant pheromone frontalin (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 873-881 
    Details
    ISSN: 1573-1561
    Keywords: Enantiomers ; bark beetle ; pheromone ; Dendroctonus frontalis ; Coleoptera ; Scolytidae ; southern pine beetle ; electrophysiology ; olfaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In laboratory and field bioassays, the response ofDendroctonus frontalis was significantly greater to the mixture of (1S, 5R)-(−)-frontalin andalpha-pinene than to (1R,5S)-(+)-frontalin andalpfa-pinene. Electro-physiological studies revealed that antennal olfactory receptor cells were significantly more responsive to (1S, 5R)-(−)-frontalin than to (1R, 5S)-(+)-frontalin. Both enantiomers stimulated the same olfactory cells which suggests that each cell possesses at least two types of enantiomer-specific acceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994788
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    Paper (German National Licenses)
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