817,254 articles

Signaling pathways point to vulnerability in breast cancer stem cells

Whitehead Institute researchers have identified signals impinging on breast epithelial cells that can induce those cells to acquire and stably display migratory and self-renewing characteristics. These signals appear to be responsible for maintaining both normal mammary epithelial stem cells and the stem cells in breast carcinomas. Interrupting these and other extracellular signals strips the...

Sport doctors say non-alcoholic wheat beer boosts athletes' health

Amateur athletes have long suspected what sports medicine researchers at the Technische Universitaet Muenchen have now made official: evidence, gathered during the world's largest study of marathons, that consumption of non-alcoholic weissbier, or wheat beer, has a positive effect on athletes' health. Under the direction of Dr. Johannes Scherr, physicians examined 277 test subjects three weeks...

Sucking up to the boss may move you up and keep you healthy

Savvy career minded individuals have known for some time that ingratiating oneself to the boss and others -- perhaps more commonly known as "sucking up" -- can help move them up the corporate ladder more quickly. However, a recent study published in the Journal of Management Studies suggests that politically savvy professionals who use ingratiation as a career aid may also avoid the psychological...

The diving bell and the water spider: How spiders breathe under water

Water spiders spend their entire lives under water, only venturing to the surface to replenish their diving bell air supply. Yet no one knew how long the spiders could remain submerged until Roger Seymour and Stefan Hetz measured the bubble's oxygen level. They found that the diving bell behaves like a gill sucking oxygen from the water and the spiders only need to dash to the surface once a day...

The downside -- and surprising upside - of microcredit

Microcredit, which involves giving small loans to very small businesses in an effort to promote entrepreneurship, has been widely touted as a way to reduce poverty and stimulate economic growth. But in a new study, researchers find that the practice may not be an efficient tool in promoting business growth or improving the lives of its beneficiaries, but could instead have just the opposite...

Ultracold neutrons for science: UCNs will help to solve mysteries of astrophysics

Scientists at Johannes Gutenberg University Mainz in Germany have built what is currently the strongest source of ultracold neutrons. Ultracold neutrons were first generated here five years ago. They are much slower than thermal neutrons and are characterized by the fact that they can be stored in special containers. This property makes them important tools for experiments to investigate why...

Why animals don't have infrared vision

On rare occasion, the light-sensing photoreceptor cells in the eye misfire and signal to the brain as if they have captured photons, when in reality they haven't. For years this phenomenon remained a mystery. Reporting in the June 10 issue of Science, neuroscientists at the Johns Hopkins University School of Medicine have discovered that a light-capturing pigment molecule in photoreceptors can be...

Record-breaking heat grips much of eastern US (AP)

AP - The mercury climbed into the 90s across half the country Wednesday in a record-breaking blast of August-like heat, forcing schools with no air conditioning to let kids go home early and cities to open cooling centers. And scientists say we had better get used to...