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  • 1
    Electronic Resource
    Electronic Resource
    Aggregation and Soil Organic Matter Accumulation in Cultivated and Native Grassland Soils (1998)
    Springer
    Soil Science Society of America journal 62 (1998), S. 1367-1377 
    Details
    ISSN: 1435-0661
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 13 C was measured for whole soil C, free LF C, and iPOM C. The mean residence time of soil C under CT (44 yr) was 1.7 times less than in NT (73 yr). The amount of free LF C was 174, 196, and 474 g C m-2 for CT, NT, and NS, respectively. Total iPOM C amounts in CT, NT, and NS were 193, 337, and 503 g C m-2, respectively. The level of fine iPOM C (53-250 μm) level in macroaggregates (250-2000μm) was only 2.4 times greater and accounted for only 21% of the difference in total POM C. Sequestration of iPOM was observed in NT vs. CT, but free LF was not influenced by differential tillage. We conclude that differences in aggregate turnover largely control the difference in fine iPOM in CT vs. NT and consequently SOM loss is affected by both the amount of aggregation and aggregate turnover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 2
    Electronic Resource
    Electronic Resource
    Aggregate and Soil Organic Matter Dynamics under Conventional and No-Tillage Systems (1999)
    Springer
    Soil Science Society of America journal 63 (1999), S. 1350-1358 
    Details
    ISSN: 1435-0661
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 13 C natural abundance to differentiate crop- and grassland-derived C. Concentrations of coarse iPOM C (250–2000 μm iPOM in macroaggregates), expressed on a per unit aggregate weight (g iPOM C kg−1 aggregate), did not differ between tillage treatments. In contrast, concentrations of fine iPOM C (53–250 μm iPOM in macroaggregates) were less in CT compared to NT macroaggregates. On a whole soil basis, fine iPOM C was on average 51% less in CT than in NT, and accounted for 21% of the total C difference between NT and CT. The concentration of free LF C was not affected by tillage, but was on average 45% less in the cultivated systems than NV. Proportions of crop-derived C in macroaggregates were similar in NT and CT, but were three times greater in microaggregates from NT than microaggregates from CT. We suggest that a faster turnover rate of macroaggregates in CT compared with NT leads to a slower rate of microaggregate formation within macroaggregates and less stabilization of new SOM in free microaggregates under CT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Localization of laminin α2 chain in normal human central nervous system: an immunofluorescence and ultrastructural study (1997)
    Springer
    Acta neuropathologica 94 (1997), S. 567-571 
    Details
    ISSN: 1432-0533
    Keywords: Key words Basal lamina ; Blood-brain barrier ; Central nervous system ; Congenital muscular dystrophy ; Laminin α2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Recently, a rare form of congenital muscular dystrophy has been shown to be associated with a deficiency of laminin α2 chain, a tissue-specific component of the basal lamina. Besides muscular dystrophy, children affected with this disorder also show electrophysiological and magnetic resonance imaging evidence of white matter involvement in the central nervous system (CNS). We have studied the precise localization of laminin α2 chain in normal human brain, using specific electron microscopic techniques including thin-section fracture labeling and cryoultramicrotomy, in parallel with immunohistochemical techniques. We found that this laminin chain was localized to the basal lamina of all cerebral blood vessels, whereas blood vessels of the choroid plexus did not show any reaction. No positive reaction was found in meningeal blood vessels either. We hypothesize that in normal brain, laminin α2 may be important for the selective filtration capability of the blood-brain barrier. The lack of laminin α2 in cerebral vessels of children with laminin α2-deficient congenital muscular dystrophy may cause impaired selective filtration, leading to leakage of plasma components and damage to the CNS. Further studies should be performed on patients affected by congenital muscular dystrophy associated with laminin α2 deficiency to test this hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004010050751
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  • 4
    Electronic Resource
    Electronic Resource
    Bibliometric analysis of publications in experimental particle physics on cosmic rays and with accelerators (1996)
    Springer
    Scientometrics 37 (1996), S. 25-37 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract In the first part, the present paper presents a quantitative analysis of physics publications in the domain of experimental particle physics, before the Second World War in the field of cosmic rays physics and for the modern times in the field of accelerator and collision rings experiments. In the second part, a more general study is made on publications in the various fields of physics separating contributions from experiment, theory and techniques. Three aspects of physics are enlightened: physics of exploration, physics of applications, and forefront physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093483
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    Paper (German National Licenses)
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