Oestrogenic Activity of Surfactants and Some of Their Degradation Products Assessed Using a Recombinant Yeast Screen (pp. 241-248)
E. J. Routledge, J. P. Sumpter

GC-MS Analysis of the Herbicide Clopyralid in Differentiatedly Cultivate Soils (pp. 249-252)
S. Schütz, B. Weißbecker and H.E. Hummel

Air Monitoring in the Arctic: Resulls for Selected Persistent Organic Pollutants (POPs) for 1992 (pp. 253-261)
P. Fellin, L.A. Barrie, D. Dougherty, D. Toom, D. Muir, B. Grift, L. Lockhart, B. Billeck

Environmental Chemistry for a Surfactant Ecotoxicology Study Supports Rapid Degradation of C12-Alkyl Sulfate in a Continuous-Flow Stream Mesocosm (pp. 262-269)
J.B. Guckert, D.D. Walker, S.E. Belanger

Predicting Relative toxicity and Interactions of Divalent Metal Ions: Microtox¨ Bioluminescence Assay (pp. 275-281)
M.C. Newman, J. T. McCloskey

Quality Control Considerations for the Determination of Acid-Volatile Sulfide and Simultaneously Extracted Metals in Sediments (pp. 282-285)
W.G. Brumbaugh and J.W. Arms

Effects of Spatial and Temporal Variation of Acid-Volatile Sulfide on the Bioavailability of Copper and Zinc in Freshwater Sediments (pp. 286-293)
J.M. Besser, C.G. Ingersoll, J.P. Giesy

Fish Bioturbation of Cadmium-Contaminated Sediments: Factors Affecting Cd Availability to Daphnia magna (pp. 294-298)
S. B. Wall, J. J. Isely, T. W. La Point

Degradation of Weathered Diesel Fuel by Microorganisms from a Contaminated Aquifer i n Aerobic and Anaerobic Microcosms (pp. 299-307)
T. P.-A. Bregnard, P. Höhener, A. HŠner, J. Zeyer

Rodent Neurotoxicity Bioassays for Screening Contaminated Grea Lakes Fish (pp. 313-318)
M.K. Beattie, S. Gerstenberger, R. Hoffman, J.A. Dellinger

Profile of Toxic Response to Sediments Using Whole-Animal and In vitro Submitochondrial Particle (SMP) Assays (pp. 319-324)
A. D. Bettermann, J. M. Lazorchak, J. C. Dorofi

Interaction of environmental xenobiotics with a Multixenobiotic Defense Mechanism in the Bay Mussel Mutilus galloprovincialis From the Cost of California (pp. 325-331)
F. Galgani, R. Cornwall, B.H. Toomey, D. D. Epel

Increased Cadmium Excretion in Metal-Adapted Populations of The Midge Chironomus Riparius (Diptera) (pp. 332-339)
J.F. Postma, P. van Nugteren, M.B. Buckert-de Jong

Toxicity and Bioaccumulation of Selenium to a Three-Trophic Level Food Chain (pp. 340-347)
M.G. Dobbs, D.S. Cherry, J. Cairns, Jr.

Buffers in Daphnid Culture and Bioassay (pp. 348-352)
K.I. Keating, P.B. Caffrey, B.C. Dagbusan

Subchronic Sensitivity of One, Four, and Seven Day Old Fathead Minnow (Pimephales promelas) Larvae to Five Toxicants (pp. 353-359)
Q.H. Pickering, J.M. Lazorchak, K.L. Winks

A Method for Assessing Sublethal Effects of Contaminants in Soils to the Earthworm, Eisenia foetida (pp. 360-368)
M.H. Gibbs, L.F. Wicker, A.J. Stewart

Accumulation and Depuration of Resin Acids and Fichtelite by the Freshwater Mussel Hyridella menziesi (pp. 369-375)
S. Burggraaf, A.G. Langdon, A.L. Wilkins, D.S. Roper

Effects of Water pH on Copper Toxicity to Early Life Stages of the Common Carp (Cyprinus carpio) (pp. 376-383)
X.J.H.X. Stouthart, J.L.M. Haans, R.A.C. Lock, S.E. Wendelaar Bonga

The Effects of Land Use Characteristics and Acid Sensitivity on the Ecological Status of Maryland Coastal Plain Streams (pp. 384-394)
L.W. Hall, Jr., M.C. Scott, W.D. Killen, Jr., R.D. Anderson

Modeling Dose Response Using Generalized Linear Models (pp. 395-401)
D.R. Kerr and J.P. Meador

Toxicokinetics-based Survival Analysis in Bioassays Using Non- persistent Chemicals (pp. 402-406)
B. Widianarko, N.M. van Straalen

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