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  • 21
    ISSN: 1432-2242
    Keywords: Pine ; Two-dimensional electrophoresis ; Haploid megagametophyte ; Linkage map
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Proteins from haploid megagametophytes from 18 trees were studied by two-dimensional polyacrylamide gel electrophoresis (2-D PAGE). A total of 222 seeds, an average of 12 per tree, were analysed individually. 150 protein spots appeared to segregate on the polyacrylamide gels in at least tree. Genetic interpretations were made to define the number of loci responsible for the presence versus absence, staining differences or position variation of the segregating spots. The complete covariation observed between some spots could be the result of either the separation of a single gene product into two or more constituents, very close linkage, or the action of a pleiotropic gene. Human genetics techniques were used to map the 84 putative loci detected. Sixty-five loci were organised in 17 linkage groups, whereas 19 remained unlinked.
    Type of Medium: Electronic Resource
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  • 22
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 64-68 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The influence of increased neutral salt content on the corrosion behaviour of non-alloyed steel in well buffered drinking watersThe influence of higher neutral salt contents in well buffered drinking water on the corrosion behaviour of unalloyed steel pipes is described in this paper. The tests were mainly performed by differential methods to measure corrosion rate and iron uptake rate. It could be shown, that higher contents in chloride and sulphate increase corrosion and even more iron uptake rate. Nitrates have no measurable effect. Additionally, it could be shown, that an increase in neutral salts leads to increased local corrosion. Further research in this field by using drinking waters with low buffer capacity will be performed and reported later on.
    Notes: In einem gut gepufferten, inhibitorarmen Trinkwasser wurde der Einfluß erhöhter Neutralsalzgehalte auf das Korrosionsverhalten unlegierten Stahls untersucht. Mit den angewendeten Untersuchungs-methoden zur differentiellen Bestimmung von Korrosions- und Eisen-abgaberaten konnte gezeigt werden, daß die Erhöhung des Chlorid-und Sulfatgehaltes über einen bestimmten Wert hinaus eine erhebliche Erhöhung der Korrosionsrate und eine noch deutlichere Erhöhung der Eisenabgabe an das Trinkwasser verursacht. Höhere Nitratgehalte zeigen dagegen keinen Effekt. Die zusätzliche Auswertung der gebildeten Deckschichten und der gebeizten Rohroberfläche zeigen eine Tendenz zum verstärkten lokalen Angriff mit höherem Neutralsalzgehalt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 23
    Electronic Resource
    Electronic Resource
    Springer
    Chemistry and technology of fuels and oils 29 (1993), S. 348-350 
    ISSN: 1573-8310
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 24
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    In:  EPIC3Current Aspects of Biogeochemistry, Seminar of the Carbon Group, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven and University of Bremen, Germany, 06.12.2004.
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 25
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    In:  EPIC3Seventh International Carbon Dioxide Conference, 25-30 Septemer 2005, Broomfield, Colorada, USA.
    Publication Date: 2019-07-17
    Description: It is investigated how abrupt changes in the North Atlantic (NA) thermohaline circulation (THC) affect the terrestrial carbon cycle. The Lund-Potsdam-Jena Dynamic Global Vegetation Model is forced with climate perturbations from freshwater experiments with the ECBILT-CLIO ocean-atmosphere model. A reorganization of the marine carbon cycle is not addressed. Modelled NA THC collapsed and recovered after about a millennium in response to prescribed freshwater forcing. The initial cooling of several Kelvin over Eurasia causes a reduction of extant boreal and temperate forests and a decrease in carbon storage in high northern latitudes, whereas improved growing conditions and slower soil decomposition rates lead to enhanced storage in mid-latitudes. The magnitude and evolution of global terrestrial carbon storage in response to abrupt THC changes depends sensitively on the initial climate conditions. These were varied using results from time slice simulations with the Hadley climate model for different periods over the past 21'000 years. Terrestrial storage varies between -67 and +50 PgC for the range of experiments with different initial conditions. Simulated peak-to-peak differences in atmospheric CO2 and d13C are 6 and 18 ppmv for glacial and early Holocene conditions. Simulated changes in d13C are between 0.18 and 0.30 permil. The small CO2 changes modelled for glacial conditions are compatible with available evidence from marine studies and the ice core CO2 record. The latter shows CO2 variations of up to 20 ppmv broadly in parallel with the Antarctic warm events A1 to A4.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 26
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    In:  EPIC3Geophysical Research Abstracts, Vol. 7, 02524, 2005. European Geosciences Union, 2nd General Assembly, 24-29 April 2005, Vienna, Austria.
    Publication Date: 2019-07-17
    Description: Measurements on air enclosed in glacial ice show that atmospheric CO2 varied by 20 ppmv within several millenia with large iceberg discharges into the North Atlantic (NA) during Heinrich events 4 to 6. The iceberg discharges have been linked to changes in the NA Thermohaline Circulation (THC). Here, we analyse how abrupt changes in the NA THC affect the terrestrial carbon cycle by forcing the Lund- Potsdam-Jena Dynamic Global Vegetation Model with climate perturbations from freshwater experiments with the ECBILT-CLIO ocean-atmosphere model. Changes in the marine carbon cycle are not addressed. Modelled NA THC collapsed and recovered after about a millennium in response to prescribed freshwater forcing preturbing glacial background climate. The initial cooling of several Kelvin over Eurasia causes a reduction of extant boreal and temperate forests and a decrease in carbon storage in high northern latitudes, whereas improved growing conditions and slower soil decomposition rates lead to enhanced storage in mid-latitudes. The magnitude and evolution of global terrestrial carbon storage in response to abrupt THC changes depends sensitively on the initial climate conditions which are here varied between preindustrial and glacial background climate. Terrestrial storage varies between 67 and +50 PgC for a range of experiments that start at different times during the last 21,000 years. Simulated peak-to-peak differences in atmospheric CO2 and 13C are between 6 and 18 ppmv and 0.18 and 0.30 o/oo and compatible with the ice core records.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 27
    Publication Date: 2019-07-17
    Description: Measurements on glacial ice show that atmospheric CO2 varied by 20ppmv with large iceberg discharges into the North Atlantic (NA) and themost prominent Dansgaard/ Oeschger (D/O) climate fluctuations. CO2variations during less pronounced D/O events were smaller than a fewppm. The D/O fluctuations have been linked to changes in the NAThermohaline Circulation (THC). Here, we analyse how abrupt changes inthe NA THC affect the terrestrial carbon cycle by forcing theLund-Potsdam-Jena Dynamic Global Vegetation Model with climateperturbations from freshwater experiments with the ECBILT-CLIOgeneral circulation model. Changes in the marine carbon cycle are notaddressed. Modelled NA THC collapsed and recovered after about amillennium in response to prescribed freshwater forcing. The initialcooling of several Kelvin over Eurasia causes a reduction ofextant boreal and temperate forests and a decrease in carbon storage inhigh northern latitudes, whereas improved growing conditions andslower soil decomposition rates lead to enhanced storage inmid-latitudes. The magnitude and evolution of global terrestrialcarbon storage in response to abrupt THC changes depends sensitivelyon the initial climate conditions. Terrestrial storage varies between-67 and +50 PgC for arange of experiments that start at different times during the last21,000 years. Simulated peak-to-peak differences in atmospheric CO2and d13C are between {6 and 18 ppmv} and $0.18$ and $0.30$~\mypermil and compatible with the ice core CO2 record.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 28
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    In:  EPIC3ESF-FWF Conference in Partnership with LFUI, OCEAN CONTROLS IN ABRUPT CLIMATE CHANGE, 19-24 May 2007 - Universitätszentrum Obergurgl, Ötz Valley, near Innsbruck, Austria..
    Publication Date: 2019-07-17
    Description: Measurements on air enclosed in glacial ice show that atmospheric CO2 varied by 20 ppmv within several millenia with large iceberg discharges into the North Atlantic (NA) during Heinrich events 4 to 6. The iceberg discharges have been linked to changes in the NA Thermohaline Circulation (THC). Here, we analyse how abrupt changes in the NA THC affect the terrestrial carbon cycle by forcing the Lund- Potsdam-Jena Dynamic Global Vegetation Model with climate perturbations from freshwater experiments with the ECBILT-CLIO ocean-atmosphere model. Changes in the marine carbon cycle are not addressed. Modelled NA THC collapsed and recovered after about a millennium in response to prescribed freshwater forcing preturbing glacial background climate. The initial cooling of several Kelvin over Eurasia causes a reduction of extant boreal and temperate forests and a decrease in carbon storage in high northern latitudes, whereas improved growing conditions and slower soil decomposition rates lead to enhanced storage in mid-latitudes. The magnitude and evolution of global terrestrial carbon storage in response to abrupt THC changes depends sensitively on the initial climate conditions which are here varied between preindustrial and glacial background climate. Terrestrial storage varies between 67 and +50 PgC for a range of experiments that start at different times during the last 21,000 years. Simulated peak-to-peak differences in atmospheric CO2 and 13C are between 6 and 18 ppmv and 0.18 and 0.30 o/oo and compatible with the ice core records.
    Repository Name: EPIC Alfred Wegener Institut
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  • 29
  • 30
    Publication Date: 2014-04-14
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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