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  • 2005-2009  (2)
  • 1990-1994  (7)
  • 1980-1984  (5)
  • 1955-1959  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Glial Fibrillary Acidic Protein (GFAP) Indicates in Vivo Exposure to Environmental Contaminants: PCBs in the Atlantic Tomcod (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 679 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb18329.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of biodiversity on the functioning of trophic groups and ecosystems (2006)
    [s.l.] : Nature Publishing Group
    Nature 443 (2006), S. 989-992 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Over the past decade, accelerating rates of species extinction have prompted an increasing number of studies to reduce species diversity experimentally and examine how this alters the efficiency by which communities capture resources and convert those into biomass. So far, the generality of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05202
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  • 3
    Electronic Resource
    Electronic Resource
    Diversity and dispersal interactively affect predictability of ecosystem function (2006)
    [s.l.] : Nature Publishing Group
    Nature 441 (2006), S. 1139-1143 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Theory and small-scale experiments predict that biodiversity losses can decrease the magnitude and stability of ecosystem services such as production and nutrient cycling. Most of this research, however, has been isolated from the immigration and emigration (dispersal) processes that create and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04729
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  • 4
    Electronic Resource
    Electronic Resource
    Pole terms and absorption in theP-wave pion-deuteron interaction (1980)
    Springer
    The European physical journal 296 (1980), S. 35-42 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We estimate the accuracy of the conventional ansatz of approximating the lowest order absorptiveP-wave pion-deuteron interactions by pole term amplitudes. By comparing the matrix elements of the approximate pole term and complete absorptive reaction amplitudes for elasticπd scattering we find the pole term approximation to lead to better than 10% accuracy for both theP 11 andP 33 state interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415612
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  • 5
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    Unknown
    Observations on Sophronius' "Miracles of Cyrus and John" (1984)
    London : Periodicals Archive Online (PAO)
    Journal of theological studies. n.s.:35 (1984) 71 
    Details
    ISSN: 0022-5185
    Topics: Theology and Religious Studies
    Notes: ARTICLES, NOTES, AND STUDIES
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:f198-1984-035-00-000009
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  • 6
    Electronic Resource
    Electronic Resource
    A New Mechanism for Amide Hydrolysis (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 1242-1243 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To determine whether or not there exist conditions under which unimolecular hydrolysis occurs, we have hydrolysed suitably substituted amides in an acid solvent (95-100 per cent sulphuric acid) which possesses good ionizing properties but contains little free water, and which is therefore ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1781242b0
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  • 7
    Electronic Resource
    Electronic Resource
    Phase and Triple Point Behaviour in Capillary Confined Co〈sub〉2〈/sub〉 (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 175-178 (Nov. 1994), p. 347-350 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/00/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.175-178.347.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Prey nutritional quality and the effectiveness of chemical defenses against tropical reef fishes (1992)
    Springer
    Oecologia 90 (1992), S. 333-339 
    Details
    ISSN: 1432-1939
    Keywords: Chemical defenses ; Coral reefs ; Nutritional quality ; Plant-herbivore interactions ; Predator-prey interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Many coral-reef seaweeds and sessile invertebrates produce both secondary chemicals and mineral or fibrous skeletal materials that can reduce their susceptibility to consumers. Although skeletal materials often have been assumed to function as physical defenses, their deterrent effectiveness may derive from their reduction of prey nutritional quality as well as from noxiousness of the skeletal material itself. To test the relative importance of prey nutritional quality and chemical defenses in susceptibility to predation, we offered reef fishes on Guam a choice of artificial foods varying in nutritional quality (4% versus 22% protein) and in secondary chemistry (spanning approximately natural concentration ranges). Field feeding assays were performed with pachydictyol A from the pantropical brown seaweed genus Dictyota, manoalide from the Micronesian sponge Luffariella variabilis, and a brominated diphenyl ether from the Micronesian sponge Dysidea sp. The results indicated that chemical defenses were less effective in high- than in low-quality foods. In paired assays with metabolite-free controls, all three compounds at natural concentrations significantly reduced feeding by reef fishes only in assays using low-quality food, and not in assays with high-quality food. When fishes were offered an array of artificial foods varying in both food quality and metabolite concentration, food quality significantly affected fish feeding in all three cases, while secondary chemistry was significant in only one. Thus differences in nutritional quality, within the natural range among reef organisms, can be comparable to or greater in importance than secondary chemistry in affecting feeding preferences of their consumers. Reduced nutritional quality may be an important selective advantage of producing indigestible structural materials, in addition to their roles as physical support and defense, in coral reef organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317689
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  • 9
    Electronic Resource
    Electronic Resource
    Amphipods on seaweeds: partners or pests? (1990)
    Springer
    Oecologia 83 (1990), S. 267-276 
    Details
    ISSN: 1432-1939
    Keywords: Amphipods ; Ampithoe ; Epiphytes ; Herbivory ; Sargassum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Herbivorous marine amphipods have been implicated as important grazers on filamentous and ephemeral algae, and thus as beneficial to macrophytes in reducing overgrowth by epiphytic competitors. In North Carolina, USA, amphipods comprise 97% of all macroscopic animals inhabiting the abundant brown seaweed Sargassum filipendula, and peak in abundance between late winter and early summer. I used outdoor tank experiments to test the species-specific impact of common phytal amphipods on the growth of Sargassum and its epiphytes. The results show that seaweed-associated amphipods are a trophically diverse group that could either increase or decrease host fitness depending on their feeding preferences. The amphipods Ampithoe marcuzii, Caprella penantis, and Jassa falcata each significantly reduced growth of epiphytes on Sargassum plants relative to amphipod-free controls, while Ericthonius brasiliensis had no significant effect on Sargassum or its epiphytes. However, amphipod grazing was not necessarily beneficial to Sargassum. A. marcuzii consumed Sargassum in one outdoor tank experiment, reducing its mass by 11%, while Sargassum plants without amphipods grew by 81%. Epiphytes (mostly diatoms and the filamentous brown alga Ectocarpus siliculosus) and detritus remained abundant on these plants suggesting that A. marcuzii preferred the host to its epiphytes. Similarly, when given simultaneous access to Sargassum and to several common foliose and filamentous epiphytes in the lab, A. marcuzii ate Sargassum almost exclusively. The other three amphipods ate no macroalgae. In contrast to A. marcuzii, C. penantis consistently reduced epiphytes with no negative effect on Sargassum. Thus the species composition of the amphipod fauna can determine whether these animals increase or decrease seaweed fitness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317764
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  • 10
    Electronic Resource
    Electronic Resource
    Genetic population structure in two tropical sponge-dwelling shrimps that differ in dispersal potential (1993)
    Springer
    Marine biology 116 (1993), S. 459-470 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial context in which “host races” of parasitic animals originate is a central issue in the controversial theory of sympatric speciation. Sponge-dwelling shrimps in the genus Synalpheus provide a good system for evaluating the possibility of resource-associated divergence in sympatry. I used allozyme electrophoresis to assess the genetic population structure of two Caribbean Synalpheus species sampled in 1988 to 1990 at a hierarchy of spatial scales. S. brooksi Coutière is a host-generalist, using several sponge species in an area, and develops directly, with no planktonic larval stage. G-tests and estimates of F ST revealed highly structured populations in this species, with significant differentiation among samples from individual reefs within a region, and strong divergence among regions (Panama, Belize, Florida). Moreover, samples of S. brooksi taken from the two sponges Spheciospongia vesparium (Lamarck) and Agelas clathrodes (Schmidt) in Panama, and separated by ≤3 km, showed significant differentiation at both of the loci that were polymorphic in these populations. Genetic distances between these host-associated populations averaged 〉60% greater than distances between samples from the same host species and were comparable to, or greater tha, those for some inter-regional comparisons. These genetic data corroborate a previous finding of demographic differences between the same populations. The second species, S. pectiniger Coutière, occurs only in Spheciospongia vesparium, and produces swimming larvae. Although allele frequencies in this species differed significantly among the three regions, S. pectiniger showed no differentiation within regions, and significantly lower differentiation (F ST) among regions than its direct-developing congener. These data suggest that genetic population structure in these two commensal crustaceans is related to dispersal potential, and that restricted dispersal may allow the divergence of host-associated populations on a local scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350063
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