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TOKYO， Dec. 27 (Xinhua) -- Tokyo shares regained some ground Tuesday morning on the weaker yen against the U.S. dollar.


The 225-issue Nikkei Stock Average rose 55.23 points， or 0.28 percent， from Monday to 19，451.87.


The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 3.67 points， or 0.24 percent， to 1，541.81.


Gainers were led by bank， pharmaceutical， and rubber product issues.


WASHINGTON Kevin Byard Black Jersey , May 12 (Xinhua) -- Mysterious dark material on the surface of Jupiter's moon Europa is likely sea salt from a subsurface ocean, darkened by exposure to radiation, researchers from the U.S. space agency NASA suggested Tuesday.


For more than a decade Derrick Henry Black Jersey , scientists have wondered about the nature of the dark material that coats long, linear fractures and other relatively young geological features on Europa's surface.


Its association with young terrains suggests the material has erupted from within Europa, but with limited data available Austin Johnson Black Jersey , the material's chemical composition has remained elusive.


To identify the dark material, researchers at NASA's Jet Propulsion Laboratory created a lab setup that mimics conditions on Europa's surface in terms of temperature, pressure and radiation exposure.


For this study Jonnu Smith Black Jersey , the researchers tested samples of common salt -- sodium chloride -- along with mixtures of salt and water, in their vacuum chamber in accordance with Europa's chilly surface temperature of minus 280 degrees Fahrenheit (minus 173 degrees Celsius).


They then bombarded the salty samples with an electron beam to simulate the intense radiation on the moon's surface.


After several days of exposure to this harsh environment, which corresponds to as long as a century on Europa Corey Davis Black Jersey , the salt samples' color turned from white to yellowish-brown, which is similar to features on the icy moon.


Additionally, the longer the samples were exposed to radiation Rashaan Evans Black Jersey , the darker the resulting color, they found.


"The presence of sea salt on Europa's surface suggests the ocean is interacting with its rocky seafloor -- an important consideration in determining whether the icy moon could support life," NASA said in a statement.


The study was published online in the U.S. journal Geophysical Research Letters.

Oral hygiene refers to the various procedures done to keep one's mouth clean and disease-free. Basically Delanie Walker Black Jersey , it includes regular brushing and flossing between the teeth in addition to regular inspection and cleaning by a dentist.
Importance of oral hygiene to a person's overall health
Oral hygiene is necessary not only to fight tooth decay and bad breath but more importantly for a person's overall health. Poor oral hygiene provides a friendly environment for harmful bacteria to multiply. From the mouth, harmful bacteria can spread through the blood stream to different parts of the body. So, in addition to dental problems Marcus Mariota Black Jersey , you are in danger of developing other diseases.
Maintaining oral hygiene between dental visits every six months is very important for dental health. Following are some pieces of advice on proper oral hygiene at home for all ages - infants to adults.
Oral Hygiene Advice for Infants and Toddlers


Oral hygiene must start soon after birth. Clean the baby's gums (upper and lower) using a clean, damp cloth at least two times daily- after the first and the last feeding.
Once a tooth has erupted, brush it with the appropriate toothbrush and rinse with water. Ask your dentist but toothpaste is usually not recommended until the child is two years old. There are special children's toothpaste available Kevin Byard Camo Jersey , which