University of Idaho eTOX - Principles of Environmental Toxicology the study of Toxic Substances in the Environment
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Lecture 5 - Dose-Response Relationships

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Learning Objectives

  1. Understand the quantitative relationship between toxicant exposure and induced effect.
  2. Describe frequently encountered toxic effects.
  3. Interpret frequency (normal distribution) and dose-response curves.
  4. Understand threshold effects with dosage increase.
  5. Understand effective dose, margin of safety and the relationship of effective vs. toxic dose.
  6. Examine the use of actual data for no observed effect and lowest observed effect in risk assessments.
  7. Summarize effective, lethal and toxic doses.
  8. Understand a linearized, multi-stage model for non-threshold responses.

Advance Reading

  1. Richards, pp 105-114; pp 305-331
  2. NLM Toxicology Tutor Dose and Response

Resources

Keywords

  • Associative relationships
  • Causal relationships
  • Ceiling effect
  • Cumulative dose-response graph
  • Dose-response relationship
  • ED50
  • Effective dose (ED)
  • Efficacy
  • Epidemiological studies
  • Frequency dose-response graph
  • LD50
  • Lethal dose (LD)
  • Margin of safety
  • Mixed toxicity
  • No Observable Effect Level (NOEL)
  • Normal distribution
  • Potency
  • Potent
  • Reversed toxicity
  • Subthreshold doses
  • TD50
  • Threshold dose
  • Threshold Limit Value (TLV)
  • Toxic dose (TD)

 

Suggested Reading

 

Lecture Materials

Slides
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Video
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Lecture Activities

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Discussion

 

Question or Comment? E-mail etox@uidaho.edu

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