Free Republic

While we all know mercury is poisonous it is methylmercury, the organic form, that bioaccumulates in food webs and is highly toxic. It's been acknowledged for years that methylmercury is produced by microorganisms far down the food chain, but what has not been known is how they do it. US-based researchers at Oak Ridge National Laboratory in Tennessee have now identified the genes, and hence the proteins, involved in mercury methylation and suggest that the pathway is common for all mercury methylating microorganisms.Using gene deletion, Jerry Parks' team showed that two genes are key components of bacterial mercury methylation, relating...

By WILLIE SOON AND PAUL DRIESSEN The Environmental Protection Agency recently issued 946 pages of new rules requiring that U.S. power plants sharply reduce their (already low) emissions of mercury and other air pollutants. EPA Administrator Lisa Jackson claims that while the regulations will cost electricity producers $10.9 billion annually, they will save 17,000 lives and generate up to $140 billion in health benefits. There is no factual basis for these assertions. To build its case against mercury, the EPA systematically ignored evidence and clinical studies that contradict its regulatory agenda, which is to punish hydrocarbon use. Mercury has always...

Enlarge ImagePoisoned. The ice fields of the north (top) carry surprisingly high concentrations of mercury in their surface crystals (bottom).Credit: University of Michigan Deadly Frost in the Arctic By Phil BerardelliScienceNOW Daily News25 February 2008The shimmering ice crystals spread across the Arctic landscape may look beautiful, but new research reveals that they carry an ugly secret: They contain surprisingly high concentrations of mercury, even when mercury is almost totally absent in the atmosphere. The researchers who made the discovery hope their findings will encourage stricter standards on mercury emissions that drift north. The form of mercury that emanates from...