SWFSC Antarctic UAS Mission Briefing Wayne Perryman, Jefferson Hinke and Douglas Krause.
Environmental Health and Toxicity- Reverse Lesson 1 Presented by Mrs. Perryman.
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Transcript of Environmental Health and Toxicity- Reverse Lesson 1 Presented by Mrs. Perryman.
Environmental Health and Toxicity- Reverse Lesson 1
Presented by Mrs. Perryman
Antibiotic and Pesticide Wheel
What does this concept mean for you?
• CBS News Report on Antibiotics
Toxic Chemicals
Hazardous• Means dangerous
Toxins• Are poisonous
We will not discuss these formally but be familiar with:
• Allergens• Antigens• Neurotoxins• Mutagens• Teratogens• Fetal Alcohol Syndrome• Carcinogens
• These may appear on the AP exam. I might include them in test questions (as part of the question), so be familiar with their meaning.
Movement, distribution and fate of toxins
Bioaccumulation
• Natural process of an organism selectively absorbing and storing a great variety of molecules
• Organism could not survive with out this process
• Biomass
Biomagnification
• A chemical is stored in tissue and is transferred up the food chain
• Usually your oil/fat soluble toxins
Two visuals to help us with this!
http://www.youtube.com/watch?v=E5P-UoKLxlA
• How does Pacman explain Bioaccumulation and Biomagnification?
Persistence
• Chemical remains for a very long time
• Directly related to the structure of the molecule.
• C-Cl combinations- not found in nature so no microbes have evolved to break them down so they remain in an ecosystem
• Example:Chloroflurocarbons
Chemical Interactions
• Antagonistic reactions- interfere with the intended effects OR stimulate the break down of a needed molecule.
• Example: Vitamin A, D and E can reduce the response an organism has to carcinogens
• Additive- occur together in an exposure
Synergistic Effect
• Interactions in which one substance exacerbates the effect of another
• Example: • London's Killer Fog• Killer Fog Part 2,3, 4,5 and
6 available on Youtube. They are interesting we will discuss this in more detail Second Semester.