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  • 1
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    Secondary reinforcement or response facilitation?: IV. The retention method. (1959)
    Provincetown, Mass., etc. : Periodicals Archive Online (PAO)
    Journal of Psychology. 48 (1959) 311 
    Details
    ISSN: 0022-3980
    Topics: Psychology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1140-1959-000-00-000068
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Snail (Helix aspersa) exposure history and possible adaptation to lead as reflected in shell composition (1994)
    Springer
    Archives of environmental contamination and toxicology 27 (1994), S. 346-351 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Lead sequestration in shell was examined for English and Welsh populations of the common garden snail (Helix aspersa) with different Pb exposure histories. Isotopic Pb ratios provided signatures for Pb source and a means of implying duration of population exposure from decades to millennia. Total Pb concentrations were used to quantify the intensity of exposure experienced by the populations. Snails from populations with long histories of exposure (millennia) to high Pb levels had proportionately more Pb in their shell than soft tissue compared with snails from other surveyed populations. These observations suggest that Pb sequestration in shell has been enhanced in H. aspersa populations with long and intense exposure to Pb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213170
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Strontium isotopes as tracers of airborne fly ash from coal-fired power plants (1981)
    Springer
    Environmental geology 3 (1981), S. 363-367 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Fly ash generated by coal-fired power plants is in part collected by filters in the emission stacks while a small portion is vented into the atmosphere. Since many of the coalfired power plants in the western United States are located in the desnrt, the ability to monitor fly ash emissions requires a chemical tracer that utilizes desert soil and plant interactions with the fly ash deposited in the desert environment. This investigation presents the results of a controlled greenhouse experiment in which a native desert plant, the brittlebush (Encelia farinosa), was grown on admixtures of desert soils and fly ash. The fly ash is strongly enriched in Sr and the brittlebush is a Sr accumulator. The data demonstrate that (1) the brittlebush isotopically equilibrates with desert soils whose fly ash components are as low as 0.25% by weight, (2) the fly ash Sr is apparently more available to the plant, than Sr derived from the soils, and (3) the difference between the87Sr/86Sr ratio of the fly ash (0.70807) and soils (0.71097 to 0.71117) warrants further investigations in the natural environment to determine the practicality of this method as a natural tracer of fly ash in the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02473525
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Imaging in the trilateral retinoblastoma syndrome (1996)
    Springer
    Neuroradiology 38 (1996), S. 166-170 
    Details
    ISSN: 1432-1920
    Keywords: Key words Trilateral retinoblastoma ; Pineal ; Magnetic resonance imaging ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The medical records, CT, and MRI of ten children with trilateral retinoblastoma were reviewed. The intracranial pathology consisted of eight pineal neoplasms and two parasellar lesions, at least seven of the which were calcified. Two lesions demonstrated calcification only (no soft tissue mass) at initial presentation. Hydrocephalus was seen in eight cases, and concurrent or subsequent subarachnoid dissemination was documented in seven. Only one patient is known to be alive at the present time. The imaging features of the midline intracranial tumors mirror those of the ocular neoplasm. As calcification may be the only clue to the presence of the intracranial malignancy, close surveillance of high-risk patients with retinoblastoma with initial CT and follow-up MRI is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604810
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Imaging in the trilateral retinoblastoma syndrome (1996)
    Springer
    Neuroradiology 38 (1996), S. 166-170 
    Details
    ISSN: 1432-1920
    Keywords: Trilateral retinoblastoma ; Pineal ; Magnetic resonance imaging ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The medical records, CT, and MRI of ten children with trilateral retinoblastoma were reviewed. The intracranial pathology consisted of eight pineal neoplasms and two parasellar lesions, at least seven of the which were calcified. Two lesions demonstrated calcification only (no soft tissue mass) at initial presentation. Hydrocephalus was seen in eight cases, and concurrent or subsequent subarachnoid dissemination was documented in seven. Only one patient is known to be alive at the present time. The imaging features of the midline intracranial tumors mirror those of the ocular neoplasm. As calcification may be the only clue to the presence of the intracranial malignancy, close surveillance of high-risk patients with retinoblastoma with initial CT and follow-up MRI is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604810
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Computed tomographic features of esthesioneuroblastoma (1989)
    Springer
    Neuroradiology 31 (1989), S. 253-257 
    Details
    ISSN: 1432-1920
    Keywords: Esthesioneuroblastoma ; CT ; Nasal tumor ; Sinus tumor ; Olfactory tumor ; Intracranial tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Esthesioneuroblastomas are uncommon neoplasms of the superior nasal cavity originating from olfactory epithelium. High resolution CT features of this neoplasm have not been well studied. Nine cases of esthesioneuroblastoma were reviewed to evaluate findings on high resolution CT. Homogeneous soft tissue masses with relatively uniform enhancement centered in the superior nasal cavity are characteristic. Bony erosion is frequent and usually accompanied by molding of bone. Staging, determined by extension and critical for treatment decisions, is well evaluated by CT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344354
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The role of ultrasound in the management of vein of Galen aneurysms in infancy (1990)
    Springer
    Neuroradiology 32 (1990), S. 86-89 
    Details
    ISSN: 1432-1920
    Keywords: Sonography, head ; Vein of Galen aneurysm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ultrasonography can be the key imaging modality for neonatal patients with vein of Galen aneurysms. Ultrasound can be used to diagnose the condition, monitor transtorcular embolization procedures, and follow-up these patients after embolization to assess the effectiveness of embolization and to check for complications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588554
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    Paper (German National Licenses)
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