January 25 - January 25, 2010 BIOACCUMULATION Molecules of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
January 25, 2010 BIOACCUMULATION – Molecules of DDT on grass in field Cow eats grass in field Eats grass with DDT DDT is in cow, in the fat Rule of 10’s – 10lb grass = 1lb cow More grass and more grass, craps out tons of waste, but DDT stays forever in the fat We eat co, with DDT in it. We end up with much much more because of bioaccumulation Bioaccumulation of DDT in long island sound 1. Water – 0.000003ppm 2. Plankton – 0.04ppm 3. Minnows – 0.5ppm 4. Large fish – 2.0ppm 5. Ospreys – 25ppm Silent spring by Rachel carson 1962 Claimed pesticides harmed environment , especially birds Lead to public outcry Contributed to EPA ban on DDT in 1972 Beginning of US environmental movement DDT can also save millions of lives Child dies of malaria every 30 seconds (UN statistics) 300 to 500 million new cases per year 90% in Africa How do we evaluate costs and benefits of chemicals Low infrequent doses Few affordable tools against malaria
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/18/2011 for the course BIO 105 taught by Professor Adler,irschick,podos during the Fall '08 term at UMass (Amherst).

Page1 / 2

January 25 - January 25, 2010 BIOACCUMULATION Molecules of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online