Environews

Forum
P. 320

NIEHS News
P. 326

Focus

Green Gimmicks for Greenbacks
P. 328

Republicans Take the Helm: What's Ahead for the Environment
P. 332

Mouse or Molecule? Mechanism-based Toxicology in Cancer Risk Assessment
P. 334

Signal Transduction: Evolution of an Idea
Martin Rodbell
P. 338

• Environmental and Dietary Estrogens and Human Health: Is There a Problem?
  Stephen H. Safe
  P. 346

• The Need for Water Quality Criteria for Frogs
  Robin Boyer and Christian E. Grue
  P. 352

• Alkyl Ethoxylated and Alkylphenol Ethoxylated Nonionic Surfactants: Interaction with Bioactive Compounds and Biological Effects
  Tibor Cserháti
  P. 358

• Dioxin Activates HIV-1 Gene Expression by an Oxidative Stress Pathway Requiring a Functional Cytochrome P450 CYP1A1 Enzyme
  Yan Yao, Amy Hoffer, Ching-yi Chang, and Alvaro Puga
  P. 366

• Effect of Nitrous Acid on Lung Function in Asthmatics: A Chamber Study
  William S. Beckett, Mark B. Russi, Alan D. Haber, Robin M. Rivkin, James R. Sullivan, Zeynep Tameroglu, Vahid Mohsenin, and Brian P. Leaderer
  P. 372

  Toward Less Misleading Comparisons of Uncertain Risks: The Example of Aflatoxin and Alar
  Adam M. Finkel
  P. 376

• Meeting Report
  Molecular and Cellular Approaches to Extrapolation for Risk Assessment
  Thomas R. Sutter
  P. 386