Introduction i

Program iii

Papers:
The History of Selenium as an Essential Trace Element for Animals - James E. Oldfield 1

The Role of Selenium as an Essential Nutrient in Humans and its Role as a Determinant of Viral Virulence - Orville A. Levander and Melinda A. Beck 7

Selenium Toxicity in Waterfowl: The Kesterson Experience - Harry M. Ohlendorf 11

Water, Soil, and Plant Selenium: Analytical Methodology - Ivan S. Palmer 20

The Geochemistry and Biogeochemistry of Selenium in Relation to Its Deficiency and Toxicity in Animals - Roland D. Meyer and Richard G. Burau 38

Abstracts:

Mineralization and Speciation of Sulfur and Selenoamino Acids Applied to Soil - Dean A. Martens and Donald L. Suarez 45

Selenium Transport in the Grasslands Watershed - Joe Karkoski, N.W.T. Quinn, L.F. Grober, J.E. Chilcott and A. Vargas 46

Selenium Bioconcentration at the Plant and Insect Food Chain Levels in a Restored Upland Grassland Contaminated by Selenium from Agricultural Drainwater - Lin Wu, Jianguo Chen, Kenneth K. Tanji and Gary S. Bannuelos 47

Selenium Deficiency and Nutritional Myodegeneration in a Herd of Horses - Pamela A. Pintchuk and John Maas 48

Selenium Content of Plants Grown in Excreta from Selenium Supplemented and Unsupplemented Cattle - Daniel J. Drake, Ben B. Norman and Harry Carlson 49

Phytoremediation of Selenium-Polluted Soils and Waters by Biological Volatilization - Adel Zayed, Lianne Pilon-Smits, Drew Hansen and Norman Terry 50

Selenosis in the Northwestern Great Plains: Dogma vs. Data - M.F. Raisbeck,
Donal T. O' Toole, E.L. Belden, R.A. Schamber and J.W. Waggoner 51

Selenium and Other Environmentally Hazardous Trace Elements in Petroleum Source-rocks, California - Caroline M. Isaacs, David Z. Piper, Kenneth J. Bird and Marilyn E. Tennyson 52

Irrigation Drainage and Selenium Contamination Problems in the Western U.S.: A
Biogeochemical Model from "Rock to Duck" - Theresa S. Presser and Janet Hren 53

Selenium Removal from Drainage Waters by Exploiting Biochemical Traits of Aquatic Plants - Teresa W.-M. Fan, Liese Schultz and Richard M. Higashi 54

Mineralization and Selenium Speciation of Seleniferous Plant Residues Added to Soil - Dean A. Martens and Donald L. Suarez 55

Supplementation of Selenium to Beef Cattle - Ronald L. Hathaway and D.R. Hill 56

Selenium Concentrations in Blood of Free-ranging Mule Deer in California - Michael N. Oliver, Gloria Ros-McGauran, David A. Jessup, Ben B. Norman and Charles E. Franti 57

Humoral Immune System Response to Copper and Selenium Supplementation in Weaned Beef Steers - Harley A. Turner, T.O. Hill, D.J. Drake, P.D. Whanger and C.L. Nunn 58

Effects of Selenium Supplementation in Cattle on Aquatic Ecosystems in Northern California - Ben Norman, Glenn Nader, Michael Oliver, Rick Delmas, Daniel Drake and Holly George 59

Selenium Enriched Superphosphate Fertilizer in Australia - Chris Halpin, John McDonald, Peter Hanrahan and Ivan Caple 60

Grazing Selenium Contaminated Rangelands - Ben Norman, Mike Oliver and John Maas 61

Participants 62

Summary 65