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Stem cell transplants stalled blindness in rats

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Stem cell transplants stalled blindness in rats

Nerve stem cell transplants may help slow the progression of macular degeneration, the most common cause of blindness in the developed world, U.S. researchers said on Monday.

They said putting nerve stem cells from StemCells Inc near the retinas of rats with a form of macular degeneration helped keep the disease from advancing to blindness for several months.

“These cells improve the chemical environment in the back of the eye,” said Ray Lund of the Casey Eye Institute at Oregon Health & Science University in Portland, whose findings were presented at the Society for Neuroscience meeting in Chicago.

Lund said the mechanism is not clear, but he suspects that when immature nerve cells are placed near the retina, they produce growth factors that protect the cells from damage by the disease.

“It’s basically a chemical pump that is sitting in the right place and producing the right things,” Lund said in a telephone interview.

Where normally animals with eye disease lost their vision by three months old, rats that got the transplants kept their vision for at least seven months, he said.

“There is no evidence that they (the transplanted cells) do any damage,” Lund said, adding that the animals do not develop tumors, a key worry for stem cell transplants.

The findings raise hope for use of the treatment in humans with a range of diseases in which the retina become damaged, including age-related macular degeneration or AMD, which affects nearly 30 million people worldwide, including 15 million Americans.

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Teeth Whitening : Can Baking Powder Bleach Your Teeth?

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Teeth Whitening : Can Baking Powder Bleach Your Teeth?

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Baking powder can bleach teeth because it contains baking soda. Simply create a paste of one-part baking powder to one-part water, and brush for one-to-two minutes.

Whiten teeth with baking powder, making sure to rinse thoroughly after brushing, with tips from a licensed dental assistant in this free video on oral hygiene.

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U.S. report confirms smoking bans cut heart attacks

`in.reuters.com

U.S. report confirms smoking bans cut heart attacks

Indoor smoking bans lower the risk of heart attack, even among nonsmokers, by reducing exposure to secondhand smoke, a panel of U.S. health experts confirmed in a report on Thursday.

The report, produced by the Institute of Medicine for the U.S. Centers for Disease Control and Prevention, provides the most definitive evidence to date that laws that ban smoking from workplaces, restaurants and bars can reduce cardiovascular-related health problems where they are imposed.

“Secondhand smoke kills. What this report shows is that smoke-free laws reduce heart attacks in nonsmokers,” said CDC director Dr. Thomas Frieden.

“But still, most of the country lives in areas that don’t have comprehensive smoke-free laws covering all workplaces, all restaurants and all bars,” he said.

The CDC asked the independent Institute of Medicine to review research on smoking bans and secondhand smoke after some studies suggested that banning smoking might significantly reduce heart attacks.

The panel of experts reviewed research including 11 studies of smoking bans in the United States, Canada and Europe showing “remarkable consistency” in the association between bans and reductions in heart attack rates, which in some studies ranged from 6 percent to 47 percent.

“There is a causal relationship … smoking bans decrease the rate of heart attacks,” the panel concluded in its report.

Advocacy groups said they hoped the report would encourage passage of more smoking bans, which the CDC estimates covers about 40 percent of the population.

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