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Today: Toxins in the Environment. Tours this week “Toxic Garbage Island” movie W 4/21 at 5pm in JES A121A (hmwk #8). Items (plastic) removed from the gullet of a fledgling Laysan albatross http://gadgets.boingboing.net/2007/08/31/plastic-litters-our.html.

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slide1

Today: Toxins in the Environment...

Tours this week

“Toxic Garbage Island” movie

W 4/21 at 5pm in JES A121A(hmwk #8)

Items (plastic) removed from the gullet of a fledgling Laysan albatross

http://gadgets.boingboing.net/2007/08/31/plastic-litters-our.html

slide8

In the late 1700's there were an estimated 100,000 bald eagles in the continental U.S.

By 1963 there were 417 nesting pairs.

slide9

1967-73 bald eagle listed as endangered

1972 DDT use banned in the U.S.

2007 bald eagle delisted

http://www.fws.gov/midwest/eagle/population/chtofprs.html

slide10

Even though the bald eagle is no longer listed as endangered, there are still problems...

slide11

On Catalina Island, CA only about 18% of bald eagle eggs have hatched over the past 15 years, largely because of DDT contamination in the eggs.

http://www.iws.org/bald_eagles/Incubation%20Facility.html

slide12

Catalina Island egg hatching

2005- 3 of 9 fertile eggs

2006- 5 of 8

2007- 7 of 9

http://www.iws.org/bald_eagles/Incubation%20Facility.html

slide13

Bald eagles in New York have been found with elevated mercury levels.

http://www.nytimes.com/2008/11/25/science/25eagl.html

slide16

BPA

  • U.S. produces more than 2.3 billion pounds per year
  • Linked to health problems in animals and humans
  • There is significant debate about whether it is safe, and at what concentration it can have detrimental affects
slide17

BPA is released from some plastics (polycarbonate), but not from others (HDPE)

X

Bisphenol A is released from polycarbonate drinking bottles and mimics the neurotoxic actions of estrogen in developing cerebellar neurons. Toxicology Letters. Volume 176, Issue 2, 30 January 2008, Pages 149-156

slide18

Bisphenol A is released from polycarbonate drinking bottles and mimics the neurotoxic actions of estrogen in developing cerebellar neurons. Toxicology Letters. Volume 176, Issue 2, 30 January 2008, Pages 149-156

slide19

BPA mimics the effects of estrogen

Bisphenol A is released from polycarbonate drinking bottles and mimics the neurotoxic actions of estrogen in developing cerebellar neurons. Toxicology Letters. Volume 176, Issue 2, 30 January 2008, Pages 149-156

slide20

Elevated BPA found in people with heart problems and diabetes

Association of Urinary Bisphenol A Concentration With Medical Disorders and Laboratory Abnormalities in Adults. Iain A. Lang, PhD; Tamara S. Galloway, PhD; Alan Scarlett, PhD; William E. Henley, PhD; Michael Depledge, PhD, DSc; Robert B. Wallace, MD; David Melzer, MB, PhD. JAMA. 2008;300(11):1303-1310.

slide22

What criteria should be used to determine the safety of a chemical?

What should the balance be between convenience, economy, and safety?

How should conflicting or controversial data be interpreted?

Who should make these decisions?

slide23

Next: Human Overpopulation

Tours this week

“Toxic Garbage Island” movie

W 4/21 at 5pm in JES A121A(hmwk #8)

Items (plastic) removed from the gullet of a fledgling Laysan albatross

http://gadgets.boingboing.net/2007/08/31/plastic-litters-our.html