The Two Big “Stars” “Lead” Zeppelin Freddie Mercury
What makes them bad?
Toxic dose of Vitamin C?
How about arsenic?
Fat (lipid) soluble
Who has more
Generally, Children or adults?
A child with exposure or an adult who had childhood exposure?
Lead and Mercury: What you (probably) already know
What are the major causes of lead poisoning in children?
What kinds of food cause mercury poisoning?
What body system do lead and mercury affect? (digestive,circulatory, etc)
How does it get there? Lead
Leaded gasoline used to be used (still in Nascar)
Lead paint chips get integrated into the soil
Lead solder to join pipes
What groups of people are more likely to be affected?
Why is it bad? Lead
How does lead cause these affects? Mimics zinc in its ability to bind (and block) a glutamate receptor Normal function: excite neurons for plasticity--> learning and memory Continuously excited --> excitotoxicity --> cell death
Lead and Juvenile Delinquency?
In children aged 7-11 years above average concentrations of lead in children’s bones is associated with an increased risk of
Attention deficit disorder
Who is likely to live in high lead areas?
Environmental Injustice? What do you think?
How does it get there? Mercury
Naturally present in soil- volcanic eruptions
Coal burning power plants
atmosphere --> water
( thermostats, thermometers, monitors)
Why is it bad? Mercury
Damage to intestine
Stomach and kidney damage
Neurological complications- myelin in kids
How does mercury affect the body?
Sensory impairment (vision, hearing speech)
Disturbed sensation (itching, burning, pain)
Lack of coordination
How? Prevents epinephrine break-down
How does it get to us?
Ingestion of fish- which fish?
Vaccines- different form, same effect?
By following these three recommendations for selecting and eating fish or shellfish, women and young children will receive the benefits of eating fish and shellfish and be confident that they have reduced their exposure to the harmful effects of mercury .
1. Do not eat Shark, Swordfish, King Mackerel, or Tilefish because they contain high levels of mercury.
2. Eat up to 12 ounces (2 average meals) a week of a variety of fish and shellfish that are lower in mercury.
* Five of the most commonly eaten fish that are low in mercury are shrimp, canned light tuna, salmon, pollock, and catfish .
* Another commonly eaten fish, albacore ("white") tuna has more mercury than canned light tuna. So, when choosing your two meals of fish and shellfish, you may eat up to 6 ounces (one average meal) of albacore tuna per week.
“ But I don’t plan on having kids for 10 years!…”
Results in an aquatic ecosystem Bacteria convert it into methyl mercury- more toxic! What happens as it is passed along the food web? Let’s find out!
Concentrations of bioaccumulative substances are found at much higher concentrations at higher trophic levels