@misc{HoppertReimerKemmlingetal.2004,
  author    = {Hoppert, Michael and Reimer, Rudolph and Kemmling, Anne and Schr{\"o}der, Annekatrin and G{\"u}nzl, Bettina and Heinken, Thilo},
  title     = {Structure and reactivity of a biological soil crust from a xeric sandy soil in Central Europe},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-5872},
  year      = {2004},
  abstract  = {The investigation was designed to explore the structure, composition and activity of a biological soil crust on an acidic, sandy soil from a temperate climate. The crust covers several hundreds of square meters on the hilltop of a large terminal moraine. The conjugate alga Zygogonium ericetorum forms the essential matrix for the crust, a dense web of algal filaments with interspersed lichens and mosses. The crust is composed of three layers, with an uppermost layer consisting nearly entirely of a dense algal mat. In lower layers, a parasitic fungus, penetrating the algal cells, is another important component of the crust community. In this soil crust, photosynthetic and respiratory activity is stabilized at low water activities.},
  language  = {en}
}
@misc{KoechyWilson2004,
  author    = {K{\"o}chy, Martin and Wilson, Scott D.},
  title     = {Variation in nitrogen deposition and available soil nitrogen in a forest-grassland ecotone in Canada},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-5768},
  year      = {2004},
  abstract  = {Regional variation in nitrogen (N) deposition increases plant productivity and decreases species diversity, but landscape- or local-scale influences on N deposition are less well-known. Using ion-exchange resin, we measured variation of N deposition and soil N availability within Elk Island National Park in the ecotone between grassland and boreal forest in western Canada. The park receives regionally high amounts of atmospheric N deposition (22 kg ha⁻¹ yr⁻¹). N deposition was on average higher ton clayrich luvisols than on brunisols, and areas burned 1 - 15 years previously received more atmospheric N than unburned sites. We suggest that the effects of previous fires and soil type on deposition rate act through differences in canopy structure. The magnitude of these effects varied with the presence of ungulate grazers (bison, moose, elk) and vegetation type (forest, shrubland, grassland). Available soil N (ammonium and nitrate) was higher in burned than unburned sites in the absence of grazing, suggesting an effect of deposition. On grazed sites, differences between fire treatments were small, presumably because the removal of biomass by grazers reduced the effect of fire. Aspen invades native grassland in this region, and our results suggest that fire without grazing might reinforce the expansion of forest into grassland facilitated by N deposition.},
  language  = {en}
}
@misc{Ginoux2003,
  author    = {Ginoux, Nicolas},
  title     = {Une nouvelle estimation extrins{\`e}que du spectre de l'op{\´e}rateur de Dirac},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-5644},
  year      = {2003},
  abstract  = {Nous {\´e}tablissons une nouvelle majoration optimale pour les plus petites valeurs propres de l'op{\´e}rateur de Dirac sur une hypersurface compacte de l'espace hyperbolique.},
  language  = {fr}
}
@misc{Ginoux2003,
  author    = {Ginoux, Nicolas},
  title     = {Remarques sur le spectre de l'op{\´e}rateur de Dirac},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-5630},
  year      = {2003},
  abstract  = {Nous d{\´e}crivons un nouvelle famille d'exemples d'hypersurfaces de la sph{\`e}re satisfaisant le cas d'{\´e}galit{\´e} de la majoration extrins{\`e}que de C. B{\"a}r de la plus petite valeur propre de l'op{\´e}rateur de Dirac.},
  language  = {fr}
}
@misc{Ginoux2004,
  author    = {Ginoux, Nicolas},
  title     = {Dirac operators on Lagrangian submanifolds},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-5627},
  year      = {2004},
  abstract  = {We study a natural Dirac operator on a Lagrangian submanifold of a K{\"a}hler manifold. We first show that its square coincides with the Hodge - de Rham Laplacian provided the complex structure identifies the Spin structures of the tangent and normal bundles of the submanifold. We then give extrinsic estimates for the eigenvalues of that operator and discuss some examples.},
  language  = {en}
}
@misc{DegkwitzAndermann2003,
  author    = {Degkwitz, Andreas and Andermann, Heike},
  title     = {Angebots-, Nutzungs- und Bezugsstrukturen elektronischer Fachinformation in Deutschland},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-672},
  year      = {2003},
  abstract  = {Mit dem {\"U}bergang zum digitalen Medium haben sich die Bezugsstrukturen und das Angebot an elektronischer Fachinformation in den Bibliotheken nachhaltig ver{\"a}ndert. In den vorliegenden Untersuchungen wird das Angebot elektronischer Zeitschriften und Datenbanken und die Nutzung elektronischer Zeitschriften in f{\"u}nf ausgew{\"a}hlten Fachgebieten und in unterschiedlichen Bibliothekstypen dargelegt. Dar{\"u}ber hinaus werden die derzeitigen Bezugsstrukturen beschrieben sowie die Ergebnisse einer Befragung der Konsortien zu Zielsetzungen, Vertragsformen und Gesch{\"a}ftsmodellen dargestellt. Chancen und Risiken der konsortialen Bezugsform werden er{\"o}rtert.},
  language  = {de}
}