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  • 1990-1994  (261)
  • 1940-1944  (18)
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  • 1
    Call number: MOP Per 900(8)
    In: Arbeitsergebnisse
    Type of Medium: Monograph available for loan
    Pages: 37 S., [25] Bl. : graph. Darst., Kt.
    Series Statement: Arbeitsergebnisse / Deutscher Wetterdienst, Abteilung Forschung 8
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 84 (1992), S. 986-989 
    ISSN: 1432-2242
    Keywords: Primates ; Ateles geoffroyi ; Karyotype ; Pericentric inversion ; Inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The karyotype of Ateles geoffroyi (Cebidae; Primates; Mammalia) was studied using G- and C-banding techniques, and standardized idiograms are proposed. A polymorphism of chromosome 3 due to a pericentric inversion has been identified for the first time. Genetic analysis of this polymorphism showed Mendelian inheritance.
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  • 3
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary A total of 56 liver samples used for the genetic study of German red deer population (Part I), were investigated with regard to the mitochondrial D-loop. Restriction analysis yielded six different mtDNA-haplotypes. Population genetic parameters as well as the results of mtDNA-analysis were discussed. Computed parameters could support the hypothesis that the former border FRG-GDR caused a reproductive separation of the western und eastern part of the Harz. Results of the sample “game reserve Reinhardswald/Hessia” can be seen as effects of the release of Hungarian and Hungarian x Yugoslav red deer in the 1980's. Parameters of population genetics and low haplotype diversity indicate low genetic variability of German red deer. Moreover, risk of allele fixation seems to be existent at all gene loci. Especially in the small isolated German populations this risk is present. Possibilities for avoiding the loss of genetic variability including negative consequences are suggested.
    Abstract: Résumé Un total de 56 échantillons de foie, qui avaient déjà été exploité lors de l'étude de populations de Cerf allemandes (1ère partie), ont été sutilisés pour une analyse des D-loops mitochondriaux. Trois systèmes polymorphes ont pu être mis en évidence au moyen de l'analyse par restriction; il en résulta six haplotypes se distribuant sur les territoires d'origine. Une discussion finale est engagée sur base de paramètres de la génétique des populations et d'haplotypes DNS mitochondriaux. Des mesures mathématiques et statistiques apportent la preuve de la séparation reproductive des populations du Harz occidental et oriental de part et d'autre de l'obstacle que constituait la frontière entre les anciennes République fédérale allemande et République démocratique allemande. En ce qui concerne le cas particulier de la Réserve Reinhardswald/Hessen, certaines constatations sont expliquées par une action de lâchers de cerfs originaires de Hongrie ainsi que de Hongrie et Yougoslavie au début des années 80. Des paramètres de génétique des populations ainsi qu'une divergence peu marquée des haplotypes indiquent une variabilité génétique faible du Cerf élaphe en Allemagne. En outre, on observe une tendance à la fixation allélique. Ce danger existe en particulier pour de petites populations isolées — une situation qui a pu précisément être vérifiée pour les territoires allemands. Des propositions sont faites en vue d'éviter d'autres appauvrissements génétiques aux conséquences éventuellement fâcheuses.
    Notes: Zusammenfassung Insgesamt 56 Leberproben, welche bereits für die populationsgenetische Studie von deutschen Rotwildpopulationen dienten (Teil I), wurden für eine Analyse des mitochondrialen D-Loops verwendet. Mit Hilfe der Restriktionsanalyse konnten drei polymorphe Systeme nachgewiesen werden, daraus resultierten sechs über die Herkunftsgebiete verteilte Haplotypen. Eine abschließende Diskussion wurde unter Beachtung populationsgenetischer Parameter und mitochrondrialer DNS-Haplotypen geführt. Mathematisch-statistische Maßzahlen liefern den Beweis der reproduktiven Trennung der Populationen aus dem Ost- und Westharz, welche durch die Grenze der alten Bundesrepublik Deutschland mit der ehemaligen Deutschen Demokratischen Republik getrennt waren. Im Rahmen einer isolierten Betrachtung des Wildschutzgebietes Reinhardswald/Hessen werden Beobachtungen als unmittelbare Folgen einer Aussetzungsaktion von ungarischem und ungarisch-jugoslawischem Rotwild zu Beginn der achtziger Jahre gewertet. Populationsgenetische Parameter und eine geringe Haplotypendivergenz weisen auf eine niedrige genetische Variabilität des Rotwildes in Deutschland hin. Darüber hinaus zeichnet sich ein Trend zur Allelfixierung ab. Diese Gefahr besteht insbesondere in kleinen, isolierten Populationen — eine Situation, welche gerade für die deutschen Rotwildgebiete nachgewiesen werden konnte. Es werden Vorschläge zur Vermeidung weiterer genetischer Verarmung, verbunden mit möglichen nachteiligen Konsequenzen, unterbreitet.
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  • 4
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary In this study 167 specimens of red deer (C. elaphus L.) from Hessia and 31 specimens from the East and West Harz were examined for genetic variability by diverse electrophoretic techniques. Three of 26 putative gene loci were found to be polymorphic. These are coding for the dimeric enzymes superoxide dismutase (SOD-2) and phosphoexose isomerase (PHI-1) and the monomeric mannose phosphate isomerase (MPI-1). A rare allele at the MPI-locus was only detected in the game preserve Reinhardswald. Significant allele frequency differences between the populations of the western and eastern parts of the Harz could support the hypothesis that the former border FRG — GDR caused a reproductive separation. The proportion of polymorphic loci (7.7%) and average heterozygosity (1.7%) for the German red deer (without the eastern part of the Harz) are less than the average value of red deer. A tendency towards a low migration rate between the investigated regions is confirmed by the close genetic similarity between neighbouring populations and a relatively high genetic differentiation among German populations.
    Abstract: Résumé Pour les besoins de la présente étude de génétique de population sur le Cerf (Cervus elaphus L.), 167 échantillons d'organes et 31 échantillons provenant du Harz occidental et du Harz oriental ont été examinés à l'aide de différentes techniques d'électrophorèse. Parmi 20 loci, trois se sont révélés polymorphes: Ils exprimaient aussi bien les enzymes dimères Superoxyde dismutase (SOD-2) et Phosphohexose isomérase (PHI-1) que l'enzyme monomère Mannose phosphate isomérase (MPI-1). Un troisième allèle sur le locus MPI n'a pu être décelé que dans l'échantillon issu du Rheinhardswald. En testant l'homogénéité des fréquences alléliques entre les populations, on a pu vérifier une divergence de fréquence entre les deux échantillons provenant des régions du Harz occidental et du Harz oriental lesquelles, jusqu'il y a peu, étaient encore séparées. Les paramètres de taux de polymorphisme des loci (7,7%) et de degré d'hétérozygotie (1,7%) se situent pour l'Allemagne fédérale (sans le Harz oriental) en-dessous de la moyenne pondérée pourCervus elaphus. La tendance à un taux de migration faible voire absent entre les populations étudiées est confortée (a) par la mesure de la distance génétique, laquelle révèle une analogie génétique de populations géographiquement voisines et (b) par la mesure de la différenciation génétique qui indique une forte variance génétique entre les populations.
    Notes: Zusammenfassung Für die vorliegende populationsgenetische Studie an Rotwild (Cervus elaphus L.) wurden 167 Organproben aus Hessen und 31 Proben aus dem Ost- und Westharz mit Hilfe diverser Elektrophoresetechniken untersucht. Von 26 Genloci wurden drei, welche die dimeren Enzyme Superoxiddismutase (SOD-2) und Phosphohexoseisomerase (PH1-1) sowie das monomere Enzym Mannosephosphatisomerase (MPI-1) exprimieren, für polymorph befunden. Ein drittes Allel am MPI-Locus konnte nur in der Stichprobe aus dem Reinhardswald entdeckt werden. Bei Prüfung auf Homogenität der Allelfrequenzen zwischen den Populationen konnte u.a. eine Frequenzdivergenz zwischen den beiden Stichproben aus den bis vor kurzem getrennten Regionen Ost- und Westharz nachgewiesen werden. Die Parameter Polymorphierate (7,7%) und der Heterozygotiegrad (1,7%) für die Bundesrepublik (ohne Ostharz) bewegen sich unterhalb der durchschnittlichen, gewichteten Werte fürC. elaphus. Die Tendenz einer geringen oder gar fehlenden Migrationsrate zwischen den untersuchten Populationen wird gestützt a) durch die genetische Distanzmessung, welche im wesentlichen eine genetische Ähnlichkeit geographisch benachbarter Populationen verdeutlicht und b) durch das Maß der genetischen Differenzierung, das eine relativ hohe genetische Varianz zwischen den Populationen ausweist.
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  • 5
    Publication Date: 1991-10-01
    Print ISSN: 0018-067X
    Electronic ISSN: 1365-2540
    Topics: Biology
    Published by Springer Nature
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  • 6
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 40-42 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6327-6330 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of neutron irradiation up to a fluence of 1023 m−2 (E〉0.1 MeV) are reported for sputtered NbN/AlN multilayer films. The superconducting properties change only slightly with neutron fluence. For the best multilayers, which exhibit critical current densities Jc of 〉108 A/m2 at 4.2 K and 20 T, the high-field data show virtually no change in Jc. It is therefore proved experimentally that NbN/AlN multilayers, which exhibit higher Jc than single NbN thin films, exhibit the same extremely radiation-hard, high-field behavior which was reported previously for such NbN films.
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3172-3175 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Four types of differently prepared NbN films were irradiated at 4.6 K with fast neutrons to a fluence of 5.3 × 1022 m−2 (E(approximately-greater-than)0.1 MeV). The critical current densities Jc were measured in magnetic fields up to 23 T prior to irradiation, following low-temperature irradiation, and again after an annealing cycle to room temperature. In all films, Jc was found to be completely unchanged by the radiation and annealing treatments in fields up to 15 T, but to increase at higher magnetic fields. At the same time, the upper critical fields Bc2 increased by about 0.5 T (∼2%). Replotting Jc versus reduced field B/Bc2 leads to identical field dependencies also in the high-field range. Hence, the observed increase of Jc is equantitatively explained as a Bc2 effect.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 828-835 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated the dynamics of the ethyl groups and their constituent methyl groups in polycrystalline ethylbenzene (EB), 1,2-diethylbenzene (1,2-DEB), 1,3-DEB, and 1,4-DEB using the solid state proton spin relaxation (SSPSR) technique. The temperature and Larmor frequency dependence of the Zeeman spin-lattice relaxation rate is reported and interpreted in terms of the molecular dynamics. We determine that only the methyl groups are reorienting on the nuclear magnetic resonance time scale. The observed barrier of about 12 kJ/mol for methyl group reorientation in the solid samples of EB, 1,2-DEB, and 1,3-DEB is consistent with that of the isolated molecule, implying that in the solid state, intermolecular electrostatic interactions play a minor role in determining the barrier. The lower barrier of 9.3±0.2 kJ/mol for the more symmetric 1,4-DEB suggests that the crystal structure is such that the minimum in the anisotropic part of the intramolecular potential is raised by the intermolecular interactions leading to a 3 kJ/mol decrease in the total barrier. We are able to conclude that the methyl group is well away from the plane of the benzene ring (most likely orthogonal to it) in all four molecules, and that in 1,2-DEB, the two ethyl groups are in the anticonfiguration. Our SSPSR results are compared with the results obtained by microwave spectroscopy and supersonic molecular jet laser spectroscopy, both of which determine molecular geometry better than SSPSR, but neither of which can determine ground electronic state barriers for these molecules.
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