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  • Articles: DFG German National Licenses  (12)
  • 1995-1999  (8)
  • 1985-1989  (4)
  • General Chemistry  (7)
  • zooplankton  (5)
Source
  • Articles: DFG German National Licenses  (12)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Dispersal-limited zooplankton distribution and community composition in new ponds (1995)
    Springer
    Hydrobiologia 313-314 (1995), S. 15-20 
    Details
    ISSN: 1573-5117
    Keywords: colonization ; rotifers ; zooplankton ; vagility ; dispersal ; metapopulations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twelve new experimental ponds were constructed identically, filled simultaneously, had similar physical and chemical properties, and were maintained with minimal manipulation. Colonizing zooplankton communities were sampled bi-weekly for one year. Rotifers dominated zooplankton communities in densities, biomass, and species number (47 of 61 observed species were rotifers). Only 14 species were observed in all 12 ponds; 9 were rotifers. Twenty-nine species (26 rotifers) were recorded in 〈-6 ponds. Species with high vagility exhibited greater viability. Ponds differed in zooplankton community composition throughout the year, due to differences in both vagility and viability among colonizing species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025926
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Zooplankton may not disperse readily in wind, rain, or waterfowl (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 15-21 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; zooplankton ; dispersal ; colonization ; wind ; rain ; waterfowl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Zooplankton, and especially rotifers, have long been thought to be readily dispersed by wind, rain and animals (especially waterfowl). Given that premise, local processes (tolerance to abiotic conditions, biotic interactions) have been the main focus of ecological studies. We tested the premise of high dispersal rates by incubating particulates collected with windsocks and rain samplers at two sites over 1 year. The sites were 80 km apart and differed in proximity to water and surrounding terrain. We also incubated fecal material of wild ducks. Pond sediments were identically incubated as a test of incubation method. Only bdelloid rotifers were collected in wind samples, and only four rotifer species were collected in rain samples: Lecane leontina, Lecane closterocerca, Keratella cochlearis, and a bdelloid. No metazoans were found in incubated duck feces, yet incubated pond sediments yielded 11 rotifer, one copepod, four cladoceran, and three ostracod species. Our results do not support the premise of readily dispersed zooplankton. If zooplankton dispersal is infrequent and limited to few species, a series of other questions should be addressed on processes regulating zooplankton population dynamics and community composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017080029317
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Comparison of processes regulating zooplankton assemblages in new freshwater pools (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 207-214 
    Details
    ISSN: 1573-5117
    Keywords: zooplankton ; rotifers ; colonization history ; disturbance ; nutrient enrichment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We compared the relative importance of colonization history to other known regulators of freshwater zooplankton assemblages (i.e. disturbance and nutrient enrichment) during this six-month study of initial colonization in artificial freshwater pools. We experimentally manipulated 16 small (1.5 m diameter) pools for permanence (permanent vs. temporary) and resource availability (± nitrogen & phosphorus). Nitrogen and phosphorus were added to high resource level pools in concentrations typical of eutrophic waters, while low resource level pools did not receive added nutrients. Permanent pools were maintained with added tap water and temporary pools dried out naturally for one month. Zooplankton colonization was limited to only 10 rotifers (species of Brachionus, Cephalodella, Lecane, Lepadella, Rotaria, and Trichocerca) and 2 crustaceans. Treatments significantly affected physical-chemical variables, colonization curves (species richness through time), and mean cumulative species number. Results indicate that local conditions (habitat permanence and resource availability) had the greatest effect on zooplankton species richness. However, low species diversity and little treatment effect on species relative abundance patterns suggest that colonization history (dispersal) was also important. Therefore, colonization history and local conditions were jointly responsible for structuring zooplankton assemblages in this study. Colonization history may have lasting effects on zooplankton composition in older, natural systems as well, but may be overlooked at some scales of measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017093810178
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Comparison of processes regulating zooplankton assemblages in new freshwater pools (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 207-214 
    Details
    ISSN: 1573-5117
    Keywords: zooplankton ; rotifers ; colonization history ; disturbance ; nutrient enrichment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We compared the relative importance of colonization history to other known regulators of freshwater zooplankton assemblages (i.e. disturbance and nutrient enrichment) during this six-month study of initial colonization in artificial freshwater pools. We experimentally manipulated 16 small (1.5 m diameter) pools for permanence (permanent vs. temporary) and resource availability (± nitrogen & phosphorus). Nitrogen and phosphorus were added to high resource level pools in concentrations typical of eutrophic waters, while low resource level pools did not receive added nutrients. Permanent pools were maintained with added tap water and temporary pools dried out naturally for one month. Zooplankton colonization was limited to only 10 rotifers (species of Brachionus, Cephalodella, Lecane, Lepadella, Rotaria, and Trichocerca) and 2 crustaceans. Treatments significantly affected physical-chemical variables, colonization curves (species richness through time), and mean cumulative species number. Results indicate that local conditions (habitat permanence and resource availability) had the greatest effect on zooplankton species richness. However, low species diversity and little treatment effect on species relative abundance patterns suggest that colonization history (dispersal) was also important. Therefore, colonization history and local conditions were jointly responsible for structuring zooplankton assemblages in this study. Colonization history may have lasting effects on zooplankton composition in older, natural systems as well, but may be overlooked at some scales of measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017093810178
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Zooplankton may not disperse readily in wind, rain, or waterfowl (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 15-21 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; zooplankton ; dispersal ; colonization ; wind ; rain ; waterfowl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Zooplankton, and especially rotifers, have long been thought to be readily dispersed by wind, rain and animals (especially waterfowl). Given that premise, local processes (tolerance to abiotic conditions, biotic interactions) have been the main focus of ecological studies. We tested the premise of high dispersal rates by incubating particulates collected with windsocks and rain samplers at two sites over 1 year. The sites were 80 km apart and differed in proximity to water and surrounding terrain. We also incubated fecal material of wild ducks. Pond sediments were identically incubated as a test of incubation method. Only bdelloid rotifers were collected in wind samples, and only four rotifer species were collected in rain samples: Lecane leontina, Lecane closterocerca, Keratella cochlearis, and a bdelloid. No metazoans were found in incubated duck feces, yet incubated pond sediments yielded 11 rotifer, one copepod, four cladoceran, and three ostracod species. Our results do not support the premise of readily dispersed zooplankton. If zooplankton dispersal is infrequent and limited to few species, a series of other questions should be addressed on processes regulating zooplankton population dynamics and community composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017080029317
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The Photoisomerisation Reactions of the Cluster [Os3(CO)9(μ3-η2:η2:η2-C6H6)] and Some of its Derivatives (1995)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 1 (1995), S. 252-260 
    Details
    ISSN: 0947-6539
    Keywords: benzene ; benzyne ; osmium clusters ; photochemistry ; polymer films ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The highly efficient photoinduced isomerisation of [Os3(CO)9(μ3-η2:η2:η2-C6H6)] (1) to the previously characterised μ3-benzyne complex [H2Os3(CO)9(μ3-η2:η1:η1-C6H4)] (2) is described. We find that for the more electron-rich clusters [Os3(CO)9-n(PPh3)n(μ3-η2:η2:η2-C6H6)] (n = 1 or 2) the efficiency of the photolytic process is improved. We suggest that photolysis generates a vacant site at osmium (mimicking the inherent coordinative unsaturation of a metal complex) and that this transformation offers a compelling model for the interconversion of associatively and dissociatively chemisorbed benzene. Moreover, we can fine-tune our molecular “work function” (really the separation of HOMO/LUMO energies) by protonation or by phosphine substitution for CO at the metal. Thus, the cation [HOs3(CO)9(μ3-η2:η2:η2-C6H6)]+ does not undergo internal metalation, while photoisomerisation of the electron-rich phosphine derivatives proceeds more readily than for 1. We find that these photolytic reactions are easily monitored by IR spectroscopy for samples suspended in polymethylmethacrylate films under ambient conditions. This method permits “matrix isolation” experiments under ideal conditions. Finally, we speculate that the mechanism of interconversion almost certainly involves the symmetric cleavage of a Os—Os bond (σ-σ* transition) to produce an extremely reactive diradical intermediate.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19950010409
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Phosphorus-31 NMR spectroscopy in stereochemical analysis. Herausgegeben von J. G. Verkade und D. L. Quin. VCH Verlagsgesellschaft, Weinheim/VCH Publishers, Deerfield Beach 1987. XVI, 717 S., geb. DM 258.00. - ISBN 3-527-26465-5/0-89573-149-5 (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 100 (1988), S. 607-607 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19881000430
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Die Struktur von gasförmigem und festem Chlorsilyl-N,N-dimethylamin (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 98 (1986), S. 97-99 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19860980122
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  • 9
    Electronic Resource
    Electronic Resource
    Synthese neuer Hybridmaterialien durch Einlagerung eines bifunktionellen Aminophosphans und seines Wolframpentacarbonylkomplexes in α-ZirconiumphosphatWir danken dem EPSRC (UK) für ein Stipendium (für J. J. P.) und den Zugang zu MAS-NMR-Einrichtungen am National Solid State NMR Service in Durham. Teile dieser Arbeit wurden durch die Europäische Kommission unter Brite-Euram II (Vertragsnummer BRE2-CT93-0450) gefördert. Wir danken Dr. K. E. Young für hilfreiche Diskussionen. (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 108 (1996), S. 1972-1974 
    Details
    ISSN: 0044-8249
    Keywords: Intercalationsverbindungen ; Komplexe mit Phosphorliganden ; Wolframverbindungen ; Zirconiumverbindungen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19961081626
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  • 10
    Electronic Resource
    Electronic Resource
    The Structure of Chlorosilyl-N, N-dimethylamine in the Gaseous and Solid Phases (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 25 (1986), S. 107-108 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198601071
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    Paper (German National Licenses)
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