Σάββατο, 7 Ιουνίου 2014

ScienceDaily: Top Science News

ScienceDaily: Top Science News


Exotic particle: Exotic bound states comprising more than three quarks confirmed

Posted: 06 Jun 2014 07:20 AM PDT

For decades, physicists have searched in vain for exotic bound states comprising more than three quarks. Experiments have now shown that, in fact, such complex particles do exist in nature. The measurements confirm first results from 2011 for the existence of an exotic dibaryon made up of six quarks.

Ability to identify source of pain varies across body

Posted: 06 Jun 2014 06:16 AM PDT

'Where does it hurt?' is the first question asked to any person in pain. A new study defines for the first time how our ability to identify where it hurts, called 'spatial acuity,' varies across the body, being most sensitive at the forehead and fingertips. The findings have important implications for the assessment of both acute and chronic pain.

Mitochondrial DNA of first Near Eastern farmers is sequenced for the first time

Posted: 06 Jun 2014 06:14 AM PDT

The mitochondrial DNA of the first Near Eastern farmers has been sequenced for the first time. Experts analyzed samples from three sites located in the birthplace of Neolithic agricultural practices: the Middle Euphrates basin and the oasis of Damascus, located in today's Syria and date at about 8,000 BC.

Optical invisibility cloak built for diffusive media (like fog or milk)

Posted: 06 Jun 2014 06:14 AM PDT

Real invisibility cloaks are rather complex and work in certain situations only. The laws of physics prevent an optical invisibility cloak from making objects in air invisible for any directions, colors, and polarizations. If the medium is changed, however, it becomes much easier to hide objects. Physicists have now succeeded in manufacturing with relatively simple means and testing an ideal invisibility cloak for diffusive light-scattering media, such as fog or milk.

Newborns exposed to dirt, dander, germs may have lower allergy, asthma risk

Posted: 06 Jun 2014 06:11 AM PDT

Infants exposed to rodent and pet dander, roach allergens and a wide variety of household bacteria in the first year of life appear less likely to suffer from allergies, wheezing and asthma, according to results of a recent study. Those who encounter such substances before their first birthdays seem to benefit rather than suffer from them. Importantly, the protective effects of both allergen and bacterial exposure were not seen if a child's first encounter with these substances occurred after age 1, the research found.

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