23 Jan 2013:
BPA Alternative Also Disrupts
Development At Low Doses, Study Says
A synthetic chemical developed as an alternative to the controversial chemical bisphenol A (BPA), and now widely used in many products, also disrupts human development at low doses
, according to a new study. Created after research indicated potential health risks associated with BPA
— a component of polycarbonate plastics found in everything from plastic bottles to cash register receipts — bisphenol S (BPS) was found in the study to disrupt cellular responses to the hormone estrogen, altering biochemical pathways that affect cell growth and hormone release, according to researchers at the University of Texas Medical Branch at Galveston. And like BPA, BPS triggers these effects at extremely low doses, the researchers found. According to Cheryl Watson, a UTMB professor and lead author of the study published in the journal Environmental Health Perspectives
, BPS is active at doses in the range of parts per trillion or quadrillion. “Those are levels likely to be produced by BPS leaching from containers into their contents,” she said. A 2012 study found human exposure to BPS is widespread in the U.S., Japan, China, and five other nations.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.