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- July 29, 2010
- Enzyme that Reverses Sun Damage Discovered
Humans lack a key enzyme found in many animals and plants that reverses severe sun damage. For the first time, researchers have witnessed how this enzyme works at the atomic level to repair sun-damaged DNA.
Scientists were able to observe the enzyme, called photolyase, inject a single electron and proton into an injured strand of DNA. These subatomic particles healed the damage in a fraction of a second.
According to Physorg:
“[Researchers] synthesized DNA in the lab and exposed it to ultraviolet light, producing damage similar to that of sunburn, then added photolyase enzymes. Using ultrafast light pulses, they took a series of ‘snapshots’ to reveal how the enzyme repaired the DNA at the atomic level.”
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- July 29, 2010
- Warning: Many Cash Register Receipts are Toxic
A new analysis by the Environmental Working Group suggests Americans are being exposed to bisphenol-A through a surprising route: paper receipts.
EWG found bisphenol-A on 40 percent of the receipts it collected from supermarkets, automated teller machines, gas stations and chain stores. In some cases, the total amount of BPA on the receipt was 1,000 times the amount found in the epoxy lining of a can of food.
According to the Washington Post:
“Sonya Lunder, a senior analyst with the environmental group, says BPA's prevalence on receipts could help explain why the chemical can be detected in the urine of an estimated 93 percent of Americans, according to the Centers for Disease Control and Prevention.”
Research suggests that low doses of bisphenol-A can interfere with your endocrine system and cause a range of health effects, including reproductive problems and cancer.
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