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  • 1
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    Soziale Psychatrie im Treibeis: Das Schicksal der Mannschaft der "Hansa" (1998)
    In:  EPIC3Deutsches Schiffahrtsarchiv, 20, pp. 421-436, ISBN: 3-8225-0479-3
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and properties of cellulose acetoacetates (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 4122-4128 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00116a011
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sex-specific survival and parasitism in three-spined sticklebacks: seasonal patterns revealed by molecular analysis (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A molecular method of identifying sex in three-spined sticklebacks Gasterosteus aculeatus showed that adult males had a higher prevalence of dermal Glugea anomala cysts than adult females, and young-of-the-year had more than adults. At the end of the breeding season, as predicted, the adult sex ratio became female biased and there was a disproportionate increase in G. anomala parasitism in adult males.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00195.x
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  • 4
    Electronic Resource
    Electronic Resource
    Acoustic Travel Time Tomography – A Method for Remote Sensingof the Atmospheric Surface Layer (1999)
    Springer
    Meteorology and atmospheric physics 71 (1999), S. 43-51 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Acoustic travel time tomography is demonstrated as a technique for remote monitoring of near surface air temperature and wind fields. An experimental procedure is presented which provides line-averaged values of the effective sound speed changing with air temperature and wind vector. In this study the travel times of sound signals at defined propagation paths between different acoustic sources and receivers were measured. The travel time data were inverted into effective sound speed values by using a special tomographic algorithm (Simultaneous Iterative Reconstruction Technique) to obtain area-averaged meteorological quantities (air temperature, wind speed). The method of acoustic travel time tomography will be applied to the atmosphere in order to directly provide spatially averaged data which are needed for evaluation of large-eddy simulation and microscale meteorological models as well as to complete conventional point measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007030050042
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  • 5
    Electronic Resource
    Electronic Resource
    Acoustic tomography in the atmospheric surface layer (1998)
    Springer
    Annales geophysicae 17 (1998), S. 139-148 
    Details
    ISSN: 0992-7689
    Keywords: Meteorology and atmospheric dynamics (turbulence; instruments and techniques)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Acoustic tomography is presented as a technique for remote monitoring of meteorological quantities. This method and a special algorithm of analysis can directly produce area-averaged values of meteorological parameters. As a result consistent data will be obtained for validation of numerical atmospheric micro-scale models. Such a measuring system can complement conventional point measurements over different surfaces. The procedure of acoustic tomography uses the horizontal propagation of sound waves in the atmospheric surface layer. Therefore, to provide a general overview of sound propagation under various atmospheric conditions a two-dimensional ray-tracing model according to a modified version of Snell’s law is used. The state of the crossed atmosphere can be estimated from measurements of acoustic travel time between sources and receivers at different points. Derivation of area-averaged values of the sound speed and furthermore of air temperature results from the inversion of travel time values for all acoustic paths. Thereby, the applied straight ray two-dimensional tomographic model using SIRT (simultaneous iterative reconstruction technique) is characterised as a method with small computational requirements, satisfactory convergence and stability properties as well as simple handling, especially, during online evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-0139-9
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  • 6
    Electronic Resource
    Electronic Resource
    Kin recognition in rainbowfish (Melanotaenia eachamensis): sex, sibs and shoaling (2000)
    Springer
    Behavioral ecology and sociobiology 48 (2000), S. 385-391 
    Details
    ISSN: 1432-0762
    Keywords: Key words Kin recognition ; Inbreeding avoidance ; Shoaling ; Fish ; Group living
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Living with relatives can be beneficial to individuals via the evolution of kin-directed altruism, but this is tempered by the increased risk of inbreeding. Therefore, in social species, the ability to recognise relatives can be highly advantageous. This study focuses on kin discrimination in the Lake Eacham rainbowfish, Melanotaenia eachamensis, an endangered freshwater species from north-east Queensland, Australia. First, I examined kin recognition abilities when a combination of both chemical and visual recognition cues was available. When given a choice of shoaling with same-sex groups, females spent significantly longer with full-sibs rather than half-sibs, full-sibs rather than non-relatives and half-sibs rather than non-relatives. Males spent significantly longer shoaling with full-brothers versus half-brothers, but showed no other shoalmate preferences. Second, in the presence of only chemical cues, females did not discriminate among groups of different levels of relatedness, but males showed a non-significant tendency to associate with full-sibs rather than non-relatives. Male shoaling behaviour seemed to be more influenced by factors other than relatedness, e.g. intra-sexual competition. Finally, I found that the shoaling preferences of females changed when exposed to groups of males. Females preferred to associate with non-relatives rather than half-brothers and non-relatives rather than full-brothers. There was no significant difference in the time spent with half-brothers versus full-brothers. Taken together, my results suggest that females have very good kin recognition abilities. They prefer to shoal with female relatives but avoid male relatives, and so are able to balance the benefits of nepotism and the costs of incest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002650000253
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  • 7
    Electronic Resource
    Electronic Resource
    Cation-mediated interaction of dextran sulfate with phospholipid vesicles: binding, vesicle surface polarity, leakage and fusion (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 637-646 
    Details
    ISSN: 1435-1536
    Keywords: Key words Dextran sulfate ; Liposomes ; Dimyristoylphosphatidylcholine ; Ca2+ ; Fusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The interaction of dextran sulfate (DS) with dimyristoylphosphatidylcholine (DMPC) large unilamellar vesicles was investigated. DS of different molecular weights (1, 8, 40 and 500 kDa) and divalent cations (Ca2+, Mg2+ and Mn2+) and the trivalent cation La3+ were used in the experiments. Binding of DS was studied by use of the microelectrophoresis and monolayer technique. Binding depends strongly on cation and NaCl concentrations in the medium and does not occur in the absence of multivalent cations. Binding is modulated by the molecular weight of the polymers; DS with lower molecular weights lead to less negative zeta potentials at identical concentrations. A comparable monomer of DS, glucose-6-sulfate, does not change the zeta potential of DMPC vesicles. Monolayer experiments revealed a decrease in surface pressure after addition of multivalent cations and DS, indicating a stronger interaction of the cation–polymer complex with the phosphatidylcholine headgroups than its penetration into the phospholipid (PL) bilayer. The cation-mediated binding of DS to the vesicles leads to aggregation of the vesicles. The tendency to promote aggregation of DMPC vesicles is La3+〉Ca2+〉Mn2+≥ Mg2+. The aggregated vesicles show a stacklike arrangement of the bilayers as shown by freeze-fracture electron microscopy. The strong aggregation is accompanied by lipid mixing measured by the 1,4-nitrobenzo-2-oxa-1,3-diazole–phosphatidylethanolamine (PE)/lissamine rhodamine B sulfonyl-PE assay. At low ionic strength substantial lipid mixing can be observed in the previously mentioned order of the cations. This lipid mixing is accompanied by an increase in the permeability of the vesicles as revealed by the 1-aminonaphthalene-3,6,8-trisulfonic acid/p-xylenebis (pyridiium bromide) assay. The extent of leakage is determined by the cation used and the DS molecular weight. These interaction processes between the opposing bilayers are connected with a decrease in the water content in the gap between the opposing PL bilayers. As a measure for the change of the polar properties of the vesicle surface the shift of the emission wavelength of the fluorescent probe dansylphosphatidylethanolamine was measured. The effectiveness of divalent/trivalent cations to decrease the surface dielectric constant of DMPC vesicles also followed the sequence of ions as found for binding, PL mixing and leakage. The results are discussed in terms of the changed hydration at the bilayer surface induced by DS in the presence of multivalent ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000295
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  • 8
    Electronic Resource
    Electronic Resource
    Die Chelatbildung von N-Tris(2-aminoethyl)amin-N′,N′,N″,N″,N‴,N‴-hexaessigsäure (H6TTAHA) und N-(Pyrid-2-yl-methyl)ethylendiamin-N,N′,N′-triessigsäure (H3PEDTA) mit Gadolinium(III) - Synthesen, Komplexstabilität und NMR-RelaxivitätProfessor Egon Uhlig zum 65. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 807-811 
    Details
    ISSN: 0044-2313
    Keywords: Chelates, Gadolinium(III) ; Stability Constants ; 1H-NMR Relaxivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chelate Formation of N-Tris(2-aminoethyl)amine-N′,N′,N″,N″,N‴,N‴-hexaacetic Acid (H6TTAHA) and N-(Pyrid-2-yl-methyl)ethylenediamine-N,N′,N′-triacetic Acid (H3PEDTA) with Gadolinium(III) - Syntheses, Stability Constants, and NMR-RelaxivitiesThe chelate formation of N-tris(2-aminoethyl)amine-N′,N′,N″,N″,N‴,N‴-hexaacetic acid (H6TTAHA) and N-(pyrid-2-yl-methyl)ethylenediamine-N,N′,N′-triacetic acid (H3PEDTA) with gadolinium(III) has been studied potentiometrically in aqueous solution at 25°C and μ = 0.1 (KCl). [Gd(TTAHA)]3-: 1gβM/ML = 19.0; {H[Gd(TTAHA)]}2-: 1gKH/MHL = 8.30; [Gd(PEDTA)]: 1gβM/ML = 15.56. Both 1 : 1 gadolinium(III) complexes were isolated as Na2H[Gd(C18H24N4O12)] · 3.5 H2O and [Gd(C14H16N3O6)] · 3 H2O, respectively. Their 1H-NMR relaxivities [1 · mmol-1 · s-1] ({H[Gd(TTAHA)]}2-: 9.5; [Gd(PEDTA)]: 8.8) offer promising applications for 1H-NMR imaging.
    Notes: Die Komplexbildung von N-Tris(2-aminoethyl)amin-N′,N′,N″,N″,N‴,N‴-hexaessigsäure (H6TTAHA) und N-(Pyrid-2-yl-methyl)ethylendiamin-N,N′,N′-triessigsäure (H3PEDTA) mit Gadolinium(III) wurde in wässeriger Lösung bei 25°C und μ = 0,1 (KCl) potentiometrisch untersucht. [Gd(TTAHA)]3-: 1gβM/ML = 19,0; {H[Gd(TTAHA)]}2-: 1gKH/MHL = 8,30; [Gd(PEDTA)]: 1gβM/ML = 15,56. Die 1 : 1-Gadolinium(III)-Komplexe wurden im Fall der H6TTAHA als Dinatriumsalz Na2H[Gd(C18H24N4O12)] · 3,5 H2O, bei der H3PEDTA als Neutralkomplex [Gd(C14H16N3O6)] · 3 H2O erhalten. Ihre NMR-Protonenrelaxivitäten [1 · mmol-1 · s-1] ({H[Gd(TTAHA)]}2-; 9,5; [Gd(PEDTA)]: 8,8) eröffnen Anwendungen als Kontrastmittel für die Kernspintomographie.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210518
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  • 9
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    Complex promoter and coding region beta 2-adrenergic receptor haplotypes alter receptor expression and predict in vivo responsiveness (2000)
    National Academy of Sciences
    Details
    Publication Date: 2000-09-12
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Apolipoprotein B mRNA-editing protein induces hepatocellular carcinoma and dysplasia in transgenic animals. (1995)
    National Academy of Sciences
    Details
    Publication Date: 1995-08-29
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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