1. Editorial

   Editorial Introduction Pages: 291 - 291

2. Sensitivity of Different Growth Inhibition Tests–Just a Question of Mathematical Calculation? Theory and Practice for Algae and Duckweed

   • Matthias Eberius
   • Guido Mennicken
   • Jörg Vandenhirtz

   OriginalPaper Pages: 293 - 297

3. Mixture Toxicity of Priority Pollutants at No Observed Effect Concentrations (NOECs)

   • Helge Walter
   • Federica Consolaro
   • Rolf Altenburger

   OriginalPaper Pages: 299 - 310

4. Application of a Sediment Quality Triad and Different Statistical Approaches (Hasse Diagrams and Fuzzy Logic) for the Comparative Evaluation of Small Streams

   • Henner Hollert
   • Susanne Heise
   • Thomas Braunbeck

   OriginalPaper Pages: 311 - 321

5. Biological and Chemical Determination of Dioxin-like Compounds in Sediments by Means of a Sediment Triad Approach in the Catchment Area of the River Neckar

   • Henner Hollert
   • Matthias Dürr
   • Thomas Braunbeck

   OriginalPaper Pages: 323 - 336

6. QSAR of Ecotoxicological Data on the Basis of Data-Driven If-Then-Rules

   • Stefan Pudenz
   • Rainer Brüggemann
   • Hans-Georg Bartel

   OriginalPaper Pages: 337 - 342

7. Effects of Phenanthrene on Lemna minor in a Sediment–Water Systemand the Impacts of UVB

   • Anna M. Becker
   • Susanne Heise
   • Wolfgang Ahlf

   OriginalPaper Pages: 343 - 348

8. Assessment of the Influence of Use on Ecotoxicological Characteristics of Synthetic Ester Lubricants

   • Gudrun Maxam
   • Stefan Hahn
   • Adolf Eisentraeger

   OriginalPaper Pages: 349 - 355

9. Determination of Urease Activity in Soils by Carbon Dioxide Release for Ecotoxicological Evaluation of Contaminated Soils

   • Ralf Guettes
   • Wolfgang Dott
   • Adolf Eisentraeger

   OriginalPaper Pages: 357 - 364

10. Errata

    • Levengood
    • Skowron

    Erratum Pages: 77 - 77

11. Experimental Studies on the Lead Accumulation in the Cestode Hymenolepis diminuta and its Final Host, Rattus norvegicus

    • Bernd Sures
    • Katja Grube
    • Horst Taraschewski

    OriginalPaper Pages: 365 - 368

12. Thallium in Terrestrial Environments–Occurrence and Effects

    • Martina Heim
    • Olaf Wappelhorst
    • Bernd Markert

    OriginalPaper Pages: 369 - 377

13. A Marine Bioassay Test Set to Assess Marine Water and Sediment Quality–its Need, the Approach and First Results

    • C. Peters
    • S. Becker
    • R. Berghahn

    OriginalPaper Pages: 379 - 383

14. Relevance and Analysis of Traffic Related Platinum Group Metals(Pt, Pd, Rh) in the Aquatic Biosphere, with Emphasis on Palladium

    • Bernd Sures
    • Sonja Zimmermann
    • Alex von Bohlen

    OriginalPaper Pages: 385 - 392

15. Selection and Prioritisation Procedure of Hazardous Substances for the Marine Environment within OSPAR/DYNAMEC

    • Suzanne Wiandt
    • Heinz-Jochen Poremski

    OriginalPaper Pages: 393 - 399