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  • Artikel  (99)
  • Springer  (61)
  • Oxford University Press  (38)
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  • Artikel  (99)
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  • 1
    Digitale Medien
    Digitale Medien
    High resolution time series of lead and zinc in sediments of Lake Constance (1995)
    Springer
    Aquatic sciences 57 (1995), S. 291-304 
    Details
    ISSN: 1420-9055
    Schlagwort(e): Lake Constance ; lake sediments ; dating methods ; heavy metal chronology ; lead ; zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Sediments in Lake Constance have been dated by radiometric methods and lamination counting. Investigations into the concentrations of lead and zinc in the sediments were carried out to get detailed information about environmental history. Maximum concentrations were found at the beginning of the 1960's. The lead maximum contamination occurred 3 years before the zinc maximum and has an unidentified source. The use of coal, leaded gasoline or the remobilization within the sediment could be excluded to result in the lead maximum. The fluctuations in zinc contamination could be explained with increasing and decreasing pollution (industry, coal burning, building of sewage plants). The greatest fluctuations of both metals occur during periods of great change in the economic history of Germany.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00878394
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  • 2
    Digitale Medien
    Digitale Medien
    Steroidal cyclic ketals: The preparation of steroidalΔ 4-3-ethyleneketals (1962)
    Springer
    Cellular and molecular life sciences 18 (1962), S. 309-310 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Zusammenfassung Ersatz vonp-Toluolsulfosäure durch Oxal- oder, bevorzugt, Adipinsäure in Salmis Methode für die Synthese vonΔ 5-3-Äthylendioxysteroiden führt zuΔ 4-3-Äthylendioxysteroiden.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02151843
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  • 3
    Digitale Medien
    Digitale Medien
    Reconstructing past eutrophication trends from diatoms and biogenic silica in the sediment and the pelagic zone of Lake Constance, Germany (1999)
    Springer
    Journal of paleolimnology 21 (1999), S. 171-192 
    Details
    ISSN: 1573-0417
    Schlagwort(e): diatoms ; biogenic silica ; pigments ; biomass ; trophic state changes ; eutrophication ; Lake Constance ; Germany
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: Abstract In Lake Constance, phosphorus concentrations and the seasonal development of phytoplankton communities in water samples from the pelagic zone were regularly recorded since the 1950's. Before the 1950's, there were occasional investigations of plankton communities since 1896. We compared these data with the sedimentary record in two sediment cores. Then, the eutrophication history of Lake Constance was inferred from diatoms. The record of biogenic silica in the cores is discussed with respect to diatom biomass increase. Diatom assemblages in the sediment cores precisely reflected the pelagic diatom development for the period 1971--1992. Both sediment cores and the water samples have a high interannual variability of diatom assemblages. Below a sediment depth of 27 cm (AD 1920), more than 50% of the diatoms were partly corroded, and we limited the reconstruction of trophic state changes to the interval of 1920--1993. Oligotrophic conditions of Lake Constance were indicated by the dominance of various Cyclotella taxa from 1920 to 1940. Since 1939/1940, increasing abundance of it Tabellaria fenestrata showed oligotrophic to mesotrophic conditions. Between 1953 and 1956, increasing Stephanodiscus hantzschii and disappearing Cyclotella indicated advanced eutrophication and total phosphorus values ranged between 8--10 mg m-3 during turnover in late winter. Further eutrophication was shown by disappearing T. fenestrata and increasing S. minutulus in 1963. Maximum TP concentrations of 87 mg m-3 occurred in 1979/80 and was accompanied by increasing abundances of Aulacoseira granulata. From 1986 to 1992, reoccurrence of Tabellaria fenestrata and Cyclotella indicate some recovery of Lake Constance. Biogenic silica and diatom abundances were similar among cores but indicate a 3--4 fold increase of diatom biomass only. This was far below the estimate of biomass increase from sedimentary pigment data (25 fold) and the estimate of phytoplankton data from the literature (70 fold).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008080922586
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  • 4
    Digitale Medien
    Digitale Medien
    Der Ozean als Quelle reaktiver Stickstoffverbindungen (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 1145-1154 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Atmospheric chemistry ; Nitrogen compounds ; Ocean source
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The paper deals with the atmospheric gaseous nitrogen-compounds under special consideration of the ocean being a source for NH3. The distribution of NH3 and NH4 + in the ocean is discussed. Additionally a survey of measured marine pH-values is given. While in temperate latitudes the source-strength of the ocean seems to be low, no such statement can be made at present for tropical latitudes owing to lack of measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01593055
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  • 5
    Digitale Medien
    Digitale Medien
    Contribution to the atmospheric NH3 budget (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 385-392 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Ammonia ; Biogenic source ; Trace gas budget
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The paper deals with recent measurements of NH3 applying an improved Indophenolblue method after Bertheolot. Aircraft measurements show a marked difference of the absolute concentration of NH3 between summer and winter. This seasonal difference indicates the effectiveness of biogenic NH3 sources during the summer months. Quantitative analysis of the source strength of different soils show the influence of the temperature at the ground and of the pH-value of the soil. The main sources of NH3 are continental, but microbiological activity in the soil alone cannot fully explain the NH3 flux into the atmosphere.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01636893
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  • 6
    Digitale Medien
    Digitale Medien
    Verallgemeinerung und Verschärfung der Erdös-Mordellschen Ungleichung für Polygone (1961)
    Springer
    Archiv der Mathematik 12 (1961), S. 311-314 
    Details
    ISSN: 1420-8938
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01650566
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  • 7
    Digitale Medien
    Digitale Medien
    High-resolution210Pb dating of Lake Constance sediments: Stable lead in Lake Constance (1994)
    Springer
    Environmental geology 24 (1994), S. 267-274 
    Details
    ISSN: 1432-0495
    Schlagwort(e): 210Pb dating ; Lead ; Sediments
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Two sediment cores (BO90/13b and BO90/17b) from Lake Constance were investigated byγ-spectrometry for210Pb,134Cs,137Cs,241Am,234Th, and other members of the238U decay chain. The sediments were dated using the constant-flux model for210Pb, and accumulation rates were determined. These range from 0.04 to 0.65g/cm 2/yr (BO90/13b) and 0.04 to 0.8g/cm 2/yr (BO90/17b), respectively. The mean accumulation rate amounts to 0.16g/cm 2/yr for both cores. The cores had already been dated by lamination counting and reconstruction of high-water events at the Limnological Institute at Constance, so that a very precise time scale was available. Both ages derived are in agreement within statistical error up to 1900, which means dating with the constant-flux model for210Pb was confirmed up to that age. The position of the maxima of bomb cesium and americium confirm the stratigraphic and210Pb datings. With241Am a further radioactive isotope is available, which can, due to the half-life of241Pu (t 1/2=14.4yr) be detected now byγ-spectrometry and can serve as an additional time indicator, the maximum being dated at 1963. By applying the various time scales, the depth profiles of stable lead and zinc of core BO90/13b were dated. Both heavy metals show a very significant maximum located beneath the layer of the maxima of bomb cesium and americium, showing that these maxima are older than those of the bomb isotopes. It is remarkable in this context that the maximum of zinc concentration occurs a little later than that of stable lead. Similar concentration profiles are observable in core BO90/17b and other, older sediment cores (CS6-CS10) on a transect across the lake. In contrast to a former assumption, the depth profile of stable lead in Lake Constance sediments does not reflect the anthropogenic gasoline lead emissions into the atmosphere for Germany, their maximum being dated at 1971.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00767087
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  • 8
    Digitale Medien
    Digitale Medien
    Besprechungen (1923)
    Springer
    Development genes and evolution 52-97 (1923), S. 673-677 
    Details
    ISSN: 1432-041X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02093646
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  • 9
    Digitale Medien
    Digitale Medien
    The HLA system and leprosy in Thailand (1978)
    Springer
    Human genetics 〈Berlin〉 42 (1978), S. 201-213 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary To investigate immunogenetics of leprosy, 205 leprosy patients (26 with tuberculoid, 57 with borderline-tuberculoid, 21 with borderline, 31 with borderline-lepromatous, and 70 with lepromatous leprosy) have been typed for HLA antigens, and compared with 183 healthy controls from the same region (Nothern Thailand). There was no significant difference between the overal group of leprosy patients or the three borderline classes and the controls. The two polar forms, tuberculoid and lepromatous leprosy, however, showed significant associations: HLA-A2 is decreased and HLA-Bw17 is increased in tuberculoid leprosy; HLA-B7 is increased in lepromatous leprosy. When both polar forms are compared with each other, HLA-A2 is significantly higher, HLA-Bw40 lower in patients with lepromatous than in those with tuberculoid leprosy. The results are discussed with respect to the different immune responsiveness in the two polar forms of leprosy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00283640
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  • 10
    Digitale Medien
    Digitale Medien
    HLA antigen, gene, and haplotype frequencies in Thailand (1978)
    Springer
    Human genetics 〈Berlin〉 41 (1978), S. 73-87 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Antigen, gene, and haplotype frequencies as well as phenotype distribution of the HLA system were studied in a series of 213 individuals in northern Thailand. The series consisted of 160 northern Thais, 23 Thai individuals from various other regions of Thailand, and 25 persons of Chinese origin. Most frequently found were the alleles HLA-A11 and HLA-Bw40 and the haplotype HLA-A2, B-. Phenotype distribution followed a Hardy-Weinberg expectation. Significant differences were found especially between our results for the alleles of locus B and the results of a series from Bangkok reported by Chiewsilp and Chanarat (1976).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00278873
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