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  • 11
    Electronic Resource
    Electronic Resource
    A gene for autosomal dominant juvenile amyotrophic lateral sclerosis (ALS4 ) localizes to a 500-kb interval on chromosome 9q34 (2000)
    Springer
    Neurogenetics 3 (2000), S. 1-6 
    Details
    ISSN: 1364-6753
    Keywords: Key words Amyotrophic lateral sclerosis ; ALS4 locus ; Fine mapping of ALS4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: ABSTRACT Amyotrophic lateral sclerosis (ALS) denotes a heterogeneous group of neurodegenerative disorders affecting upper and lower motor neurons. ALS4 is a juvenile-onset, autosomal dominant form of ALS that is characterized by slow progression, distal limb weakness and amyotrophy, and pyramidal signs associated with severe loss of motor neurons in the brain and spinal cord. The ALS4 locus was recently mapped by linkage analysis to a large genetic interval on chromosome 9q34. By undertaking extensive genetic linkage analysis, we have significantly refined the ALS4 locus to a critical interval of less than 3 cM, flanked by D9S149 and D9S1198. Previous physical mapping in this region has indicated that this critical interval spans approximately 500 kb. Seventeen putative transcripts have been localized within this interval including 7 characterized genes, 2 partially characterized genes, and 8 "anonymous" expressed sequence tags . These are therefore positional candidate genes for the ALS4 locus. We have also undertaken mutation analysis and genetic mapping to investigate and exclude candidate genes, including RING3L/ORFX and RALGDS , from a pathogenic role in ALS4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 12
    Electronic Resource
    Electronic Resource
    Impact of erosion-transported overburden dump materials on water quality in Lake Cospuden evolved from a former open cast lignite mine south of Leipzig, Germany (2000)
    Springer
    Environmental geology 39 (2000), S. 683-688 
    Details
    ISSN: 1432-0495
    Keywords: Key words Geomorphology ; Soil chemistry ; Hydrochemical modelling ; Lignite mines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Acidification is the most common water quality problem in lakes created from previous open cast lignite mines. Aeration of aquifers and dump materials from mining activities causes pyrite oxidation. Pyrite oxidation products are stored in pore water, minerals and at the exchange complexes of the aquifers and dump sediments. Rainfall runoff transports sediments on the dump slope into the lakes. Elutriation of these sediments whithin the lakes releases either acid-producing or acid-neutralizing agents. At a test site south of Leipzig, the annual erosion rates were quantified by water erosion models (RUSLE, EROSION 2D, PEPP) and field measurements. They ranged from 300 up to 900 tons per hectare. Hydrogen ion equivalent release or binding at the sediment elutriation was computed from laboratory analysis of the pore-water quality, ion exchange complex and mineral composition of the sediment. Two of the three investigated sediments contained 3 mmol (eq) acidity per 100 g dry sediment and revealed saturation with respect to jarosite, jurbanite and gypsum. In the third sediment, 6 mmol (eq) alkalinity per 100 g dry sediment was obtained. The annual net acidity influx was calculated to be about 0.5 million mol (eq) for the lake of the test site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050482
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  • 13
    Electronic Resource
    Electronic Resource
    Nematode numbers, biomass and respiratory metabolism in a beech woodland—Wytham Woods, Oxford (1977)
    Springer
    Oecologia 27 (1977), S. 141-155 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mean annual population density of nematodes in the litter and upper 6 cm of soil was found to be 368,000 m-2. Mean individual live weight biomass approximated 0.2 μg and mean biomass was calculated to be 74.6 mg live weight m-2. No evidence of seasonal vertical migration between the litter, 0–3 cm and 3–6 cm strata was found and on average these strata contained 21.9, 46.2 and 31.9% respectively of the total number of nematodes recovered. The equivalent biomass values were 26.14, 56.57, and 17.29%. Total numbers revealed a general picture of low densities in spring and high ones in early winter, whereas biomass m-2 was low in late summer — autumn and high in winter. The annual oxygen consumption of the extracted nematodes was calculated to approximate 0.211 m-2 (≈4.0 kJ m-2) but when corrected for the effect of individual biomass (weight specific oxygen uptake) was equivalent to an energy expenditure ≈6.0 kJ m-2 which in its turn, because of the efficiencies of extraction, probably accounts for only 87% of the total energy expenditure by the nematode fauna. The nematodes were estimated to be responsible for a minimum of 0.11% to a maximum of 0.13% of the total “soil” respiration. A production/biomass ratio of 5.16 was estimated as was a net population production efficiency of 36.63%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345819
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  • 14
    Electronic Resource
    Electronic Resource
    Vergleichende Untersuchungen nach verschiedenen Methoden zur Bestimmung der „Tonsubstanz” in Kaolinen, Tonen und tonerdereichen Böden (1938)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 114 (1938), S. 456-456 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400105
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  • 15
    Electronic Resource
    Electronic Resource
    A two-surface model describing ratchetting behaviors and transient hardening under nonproportional loading (1996)
    Springer
    Acta mechanica Sinica 12 (1996), S. 368-376 
    Details
    ISSN: 1614-3116
    Keywords: nonproportional loading ; multiaxial loading ; ratchetting ; two-surface model ; cyclic hardening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new superposed rule of Mroz's kinematic hardening rule and Ziegler's kinematic hardening rule based on two-surface model is proposed in the paper. Some experimental results on ratchetting of 2014-T6 aluminum alloy are predicted very well under multiaxial loading. In addition the conformability of the model is discussed for transient cyclic hardening under two kinds of nonproportional cyclic loading paths, i.e. square and rhombic path.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487802
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  • 16
    Electronic Resource
    Electronic Resource
    Characterisation of acrylate latices by potentiometry and spectrophotometry (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 10 (1985), S. 297-303 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In the characterisation of latices conductometry is the technique most commonly used. In this paper it is shown that a thorough characterisation of latices is possible based mainly on potentiometric titrations in aqueous and non-aqueous media and on spectrophotometry. Results obtained with these techniques in the study of acrylate latices prepared with nonylphenolpolyethyleneoxidesulphate as the emulsifier are presented. It is shown that this type of emulsifier is subjected to considerable hydrolysis during the emulsion polymerisation process.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.020101985121
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