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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical Systematics and Ecology 20 (1992), S. 485-492 
    ISSN: 0305-1978
    Keywords: Eugelena ; FPLC ; UV radiation ; absorption spectroscopy ; chlorophyll ; fluorescence spectroscopy ; photosynthesis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2242
    Keywords: Key words Oak ; Quercus ; Relatedness ; Linkage disequilibrium ; Microsatellites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We present an approach to infer the number of pollen donors directly from genotype data of open- pollinated progeny of Quercus robur (pedunculate oak), a highly outcrossing tree species. The approach is based on closely linked, highly polymorphic codominant microsatellite markers. Initially the close linkages between three previously mapped microsatellite loci were confirmed by studies of linkage disequilibrium (LD). Then an approach to track the pollen donors contributing to maternal half-sib families (open-pollinated families) was developed by analysing haplotype arrays of closely linked microsatellite markers transmitted from the fathers to the progeny. Simulated data of five linked microsatellite loci segregating in eight open-pollinated families were used to study the relationship between the number of paternal chromosomes detected by this ”haplotype approach” and the number of diploid fathers contributing to the families. The results showed that the number of diploid pollen donors can be expressed as an exponential function of the number of paternal chromosomes inferred from the progeny. The 95% confidence interval of this regression function is used to determine the minimum number of fathers contributing to a genotyped open-pollinated family of Quercus robur. Finally this open-pollinated family is used to demonstrate the resolution obtained with the ”haplotype approach”. Six independent microsatellite loci were used to study relatedness among all pairs of pollen gametes that share a haplotype of three linked markers. The results suggest that the majority of such gametes are identical by descent from the same father. The ”haplotype approach” presented here can be used to monitor the number of contributing pollen donors in commercial seedlot samples from oak or any other outcrossing tree species for which closely linked, highly polymorphic, codominant genetic markers are available.
    Type of Medium: Electronic Resource
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  • 3
    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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