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  • 1995-1999  (5)
  • arable soil  (3)
  • Life and Medical Sciences  (2)
  • Breast cancer
  • 1
    Electronic Resource
    Electronic Resource
    Importance of soil cover box area for the determination of N2O emissions from arable soils (1996)
    Springer
    Plant and soil 181 (1996), S. 185-192 
    Details
    ISSN: 1573-5036
    Keywords: arable soil ; cover box technique ; nitrous oxide ; spatial and temporal variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Five soil cover box systems varying in area were used to measure the N2O emissions from four arable soils. The covered area of the systems ranged from 78 to 576000 cm2. The observed N2O emission rates were approximately log-normal distributed. The greatest influence of variation of N2O emission rates could be attributed to the factor sampling date/time. The different soil cover box systems were assessed by comparing measured mean N2O releases, their time courses and spatial variation. The spatial coefficient of variation of N2O emission rates decreased logarithmically with an increasing radius of the soil cover box system used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012052
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temporal changes in soil microbial biomass carbon in an arable soil. Consequences for soil sampling (1995)
    Springer
    Plant and soil 170 (1995), S. 287-295 
    Details
    ISSN: 1573-5036
    Keywords: arable soil ; crop rotation ; freeze-thaw ; microbial biomass-C ; plant growth ; substrate-induced respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Sugar beet, winter wheat and winter barley were planted within a crop rotation on an arable soil with conventional soil management. Soil samples were taken monthly from different depths of the whole plough layer (0–10, 10–20 and 20–30 cm) during a 56 month period. The samples were analysed for microbial biomass carbon using the substrate-induced respiration technique. Temporal changes in the amount of microbial biomass carbon were observed. Within a year, microbial biomass-C varied from low values (−15% of total mean) in winter to high values (+15% of total mean) in summer. Relative deviations from the annual means were calculated for each month in the year to demonstrate these fluctuations. Temporal changes in microbial biomass-C depended on the sources of sample variation (5 years, 3 crops, 3 sampling depths). The highest relative deviation from the annual mean microbial biomass-C was attributable to the factor “year”. Less variations were caused by “crops” and “sampling depth”. Soil microbial biomass-C remained constant during frost periods. From the observed temporal changes, recommendations for a suitable date for soil sampling are given, which allows a representative estimation of the mean annual microbial biomass-C content in arable soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010481
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Temporal changes in N2O-losses from two arable soils (1996)
    Springer
    Plant and soil 181 (1996), S. 57-63 
    Details
    ISSN: 1573-5036
    Keywords: arable soil ; nitrous oxide ; soil texture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract N2O-loss rates from two soils were measured over a continuous observation period of 2 years. The two soils, differing in texture (sandy loam and silty loam), are frequently used for intensive crop production. Rates were estimated using a closed soil cover box technique. N2O-losses obtained were scrutinised with physical, chemical and microbiological properties of the soils as well as with climatic data. Large temporal changes in N2O-emission rates were found. The data were approximately log-normal distributed. In spring maximal values of 20 g N2O-N ha-1 d-1 were observed. According to this observation, two situations associated with high flux rates could be distinguished; 1. N2O- production by soil at spring thaw and 2. N2O-production within one week after N-fertilizer application. For both soils equal N2O-losses were found, which are adequate to 1 kg N2O-N ha-1 per year. From this data was calculated that N2O-losses ranged from 0.8–1.5% of the applied fertilizer N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011292
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Die Flexibilität des genetischen Kodes (1996)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 26 (1996), S. 369-379 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: 1966 wurde die Entschlüsselung des genetischen Kodes abgeschlossen. Jedem Basentriplett konnte eine Kodicrungsfunktion zugewiesen werden. Zwanzig Jahre später wurde klar, daß dieser Kode, trotz seiner universellen Gültigkeit, flexibel ist: Zur Vereinfachung der Dekodierung nutzen Mycoplasmen und Mitochondrien nicht alle Kodonen, und einige haben abweichende Bedeutung.Leserahmenverschiebungen um eine Base in 5′- oder 3′-Richtung erlauben einem Gen zwei, statt einen einzigen Leserahmen zu nutzen. Solch ein Mechanismus wird zur Autoregulation cines Proteins, des Releasefaktors 2, verwendet. Retroviren, die verschiedene Mengen bestimmter Fusionsproteine benötigen, balancieren deren Synthese durch unterschiedlich effiziente Leserahmenwechsel. Zur Translation eines Bakteriophagengens überspringen die Ribosomen durch eine extreme Leserahmenverschiebung sogar 50 Basen auf der mRNA. In Bakterien wurde beobachtet, daß translatierende Ribosomen eine beschädigte mRNA gegen eine spezialisierte, stabile RNA (10 Sa RNA) austauschen, während die Proteinsynthese fortgesetzt wird.Die sensationelle Entdeckung der 21. DNA-kodierten Aminosäure Selenocystein bewies, daß der genetische Kode bisher keineswegs vollständig entziffert war. Überraschenderweise ist das Kodon für Selenocystein das UGA-Stopp-Kodon. Im Unterschied zu den zwanzig Standardaminosäuren enthält dieses Kodon nur die Information zur Positionierung der Aminosäure, während die Selenocystein-Spezifität auf einer besonderen mRNA-Sekundärstruktur beruht. Zur Dekodierung des Selenocystein-Kodons ist ein spezieller Translationsfaktor erforderlich, durch den sichergestellt wird, daß nur UGA-Kodonen mit der entsprechenden mRNA-Struktur als Selenocystein-Kodon erkannt werden.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19960260610
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Der Streit um das Neuron (1997)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 27 (1997), S. 24-33 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Den gemeinsamen Nobelpreis erhielten Golgi und Cajal „in Anerkennung ihrer Arbeiten über die Struktur des Nervensystems“. Die Namen dieser beiden Wissenschaftler haben in der Biologie heute noch Klang. Der Spanier Santiago Ramón y Cajal (1852-1934) führte bahnbrechende Untersuchungen an praktisch allen Teilen des Nervensystems durch, und die meisten seiner Befunde und Schlußfolgerungen haben bis in die Gegenwart Bestand. Der Italiener Camillo Golgi (1843-1926) erfand die erste und heute noch wichtige Färbemethode (Golgi-Färbung) zur vollständigen Darstellung einzelner Nervenzellen. Ironischerweise trugen Befunde, die andere mit der Golgi-Färbung erhoben, wesentlich dazu bei, Golgis eigene Ansichten über den Bau des Nervensystems zu Fall zu bringen. Im folgenden begegnen uns die beiden Preisträger als Wortführer im Lager der „Neuronisten“ und „Retikularisten“ (lat.reticulum - kleines oder feines Netzwerk). Doch davon später; folgen wir der Chronologie [1].
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.960270114
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    Paper (German National Licenses)
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