Sorry this is a little rant sounding >_<. I had to get the idea out and if it doesn’t make sense or you have questions please ask. I would love to answer anything! So, in short if your interested reply and we’ll get started ^_^

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Former White House spokesman and one of the president?s closest confidantes: Obama for America Campaign adviser, Robert Gibbs. Then, Gov. Mitch Daniels (R-IN). Finally, our roundtable: former Tennessee congressman, Harold Ford, Jr. (D); columnist for the Wall Street Journal Peggy Noonan; columnist for the Washington Post, E.J. Dionne; and host of CNBC?s Closing Bell, Maria Bartiromo.

Source: http://www.msnbc.msn.com/id/3032608/vp/45094329#45094329

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Wow! Charlie Sheen Really Is Winning!

Charlie Sheen is returning to television after his new sitcom Anger Management was picked up by FX! FX has reportedly ordered 10 episodes of Anger [...]

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Source: http://moviesblog.mtv.com/2011/10/28/johnny-depp-rum-diary-drinks/

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Article posted by BreslerSailer223 as Credit

For those who?ve ever bought an automotive, or are in the market for an automobile, then you know the way essential analysis is. Right information gathering procedures can help you make an knowledgeable choice on the automotive you wish to buy. You need to do every thing potential to stop your self from spending your exhausting-earned dollars on a lemon of an automobile. Due to your diligence to information, there are numerous routes out there so that you can choose to get the data you need. You may question individuals concerning the automobile in query, for example. Nevertheless, most individuals, when they?re on the lookout for an automotive to buy, use consumer studies to get the data they need.

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I’ve used Squaretrade to have my Sony laptop repaired. They’re good for that. However, you have to ship out your item. So, for phones, I prefer Assurion.

Steven

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Monday, October 24, 2011

A new study demonstrates that mechanical forces affect the growth and remodeling of blood vessels during tissue regeneration and wound healing. The forces diminish or enhance the vascularization process and tissue regeneration depending on when they are applied during the healing process.

The study found that applying mechanical forces to an injury site immediately after healing began disrupted vascular growth into the site and prevented bone healing. However, applying mechanical forces later in the healing process enhanced functional bone regeneration. The study’s findings could influence treatment of tissue injuries and recommendations for rehabilitation.

“Our finding that mechanical stresses caused by movement can disrupt the initial formation and growth of new blood vessels supports the advice doctors have been giving their patients for years to limit activity early in the healing process,” Robert Guldberg, a professor in the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology. “However, our findings also suggest applying mechanical stresses to the wound later on can significantly improve healing through a process called adaptive remodeling.”

The study was published last month in the journal Proceedings of the National Academy of Sciences. The research was supported by the National Institutes of Health, the Armed Forces Institute of Regenerative Medicine and the U.S. Department of Defense.

Because blood vessel growth is required for the regeneration of many different tissues, including bone, Guldberg and former Georgia Tech graduate student Joel Boerckel used healing of a bone defect in rats for their study. Following removal of eight millimeters of femur bone, they treated the gap with a polymer scaffold seeded with a growth factor called recombinant human bone morphogenetic protein-2 (rhBMP-2), a potent inducer of bone regeneration. The scaffold was designed in collaboration with Nathaniel Huebsch and David Mooney from Harvard University.

In one group of animals, plates screwed onto the bones to maintain limb stability prevented mechanical forces from being applied to the affected bone. In another group, plates allowed compressive loads along the bone axis to be transferred, but prevented twisting and bending of the limbs. The researchers used contrast-enhanced micro-computed tomography imaging and histology to quantify new bone and blood vessel formation.

The experiments showed that exerting mechanical forces on the injury site immediately after healing began significantly inhibited vascular growth into the bone defect region. The volume of blood vessels and their connectivity were reduced by 66 and 91 percent, respectively, compared to the group for which no force was applied. The lack of vascular growth into the defect produced a 75 percent reduction in bone formation and failure to heal the defect.

But the study found that the same mechanical force that hindered repair early in the healing process became helpful later on.

When the injury site experienced no mechanical force until four weeks after the injury, blood vessels grew into the defect and vascular remodeling began. With delayed loading, the researchers observed a reduction in quantity and connectivity of blood vessels, but the average vessel thickness increased. In addition, bone formation improved by 20 percent compared to when no force was applied, and strong tissue biomaterial integration was evident.

“We found that having a very stable environment initially is very important because mechanical stresses applied early on disrupted very small vessels that were forming,” said Guldberg, who is also the director of the Petit Institute for Bioengineering and Bioscience at Georgia Tech. “If you wait until those vessels have grown in and they’re a little more mature, applying a mechanical stimulus then induces remodeling so that you end up with a more robust vascular network.”

The study’s results may help researchers optimize the mechanical properties of tissue regeneration scaffolds in the future.

“Our study shows that one might want to implant a material that is stiff at the very beginning to stabilize the injury site but becomes more compliant with time, to improve vascularization and tissue regeneration,” added Guldberg.

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Georgia Institute of Technology Research News: http://gtresearchnews.gatech.edu

Thanks to Georgia Institute of Technology Research News for this article.

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Source: http://www.labspaces.net/114558/Mechanical_stress_can_help_or_hinder_wound_healing_depending_on_time_of_application

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