Aging has long been recognized as the worst risk factor for chronic ailments like atherosclerosis, which clogs arteries and leads to heart attacks and stroke. Yet, the mechanism by which aging promotes the clogging of arteries has remained an enigma.
Scientists at Duke University Medical Center have discovered that a major problem with aging is an unexpected failure of the bone marrow to produce progenitor cells that are needed to repair and rejuvenate arteries exposed to such environmental risks as smoking or caloric abuse.
The researchers demonstrated that an age-related loss of particular stem cells that continually repair blood vessel damage is critical to determining the onset and progression of atherosclerosis, which causes arteries to clog and become less elastic. When atherosclerosis affects arteries supplying the heart with oxygen and nutrients, it causes coronary artery disease and puts patients at a much higher risk for a heart attack.
Richard Merritt | dukemed news
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The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.
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Researchers at Chalmers University of Technology and the University of Gothenburg, Sweden, have proposed a way to create a completely new source of radiation. Ultra-intense light pulses consist of the motion of a single wave and can be described as a tsunami of light. The strong wave can be used to study interactions between matter and light in a unique way. Their research is now published in the scientific journal Physical Review Letters.
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