Common house dust may be an important source of a potentially dangerous class of chemicals called polybrominated diphenyl ethers (PBDEs), according to an exploratory study* by researchers at the National Institute of Standards and Technology (NIST) and the Environmental Protection Agency (EPA). Recent studies by others have found that PBDEs have been accumulating in human blood, fat tissue and breast milk.
PBDEs have been widely used in consumer products for years because they are effective flame retardants, greatly increasing the fire safety of products ranging from carpeting and cushions to televisions, computers and coffee makers. In recent years, however, concerns have grown with evidence that PBDE concentrations are increasing rapidly both in the environment and in human tissues and body fluids. Toxicological data on PBDEs is still limited, but the compounds have been implicated in developmental, reproductive, neurotoxicity and thyroid effects in rats, mice and fish, and may be carcinogenic. Researchers in Europe and the United States found concentrations of PBDEs higher in Americans than in Europeans, although it is not known if these levels affect human health.
Some studies have suggested that people accumulate PBDEs through diet (similar to polychlorinated biphyenyls or PCBs), however, diet alone does not seem to explain the high levels of PBDEs that have been measured in human breast milk and serum. According to the new NIST/EPA study, house dust and the home environment are likely candidates for other sources of exposure.
Michael Baum | EurekAlert!
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Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
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