Word: layering
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CORNEAS There aren't many treatments for a scarred cornea, the opaque outer layer of the eye, since corneal tissue can't be easily replaced. But it may be possible to grow a new one. Doctors have successfully transplanted tissue from other parts of the eye to reconstruct the cornea and restore sharper sight to a handful of patients...
...cloning technique used with Bessie--the only cow in the experiment to carry an embryo into late pregnancy--is a variation of the procedure that created Dolly the sheep, the world's first cloned mammal. A needle is jabbed through an egg's protective layer and used to remove the egg's nucleus, containing most of a cell's genetic material. A second needle is used to inject a whole cell under the egg's outer layer. To complete the process, an electrical current fuses the new cell to the egg. The embryo starts to divide until, within days...
...CORNEAS There aren't many treatments for a scarred cornea, the opaque outer layer of the eye, since corneal tissue can't be easily replaced. But it may be possible to grow a new one. Doctors have successfully transplanted tissue from other parts of the eye to reconstruct the cornea and restore sharper sight to a handful of patients...
...NASA has come up with the most striking evidence yet. The Mars Global Surveyor, which has been orbiting the Red Planet since 1997, has returned an album of images that show in brilliant detail outcroppings of layered rock, some more than two miles deep, that appear to be the remains of lake beds dating back more than 3.5 billion years. Why should lakes be important on a planet that we already knew had rivers and seas? Because the newly discovered formations precisely resemble the sedimentary depressions that have yielded some of Earth's richest fossil lodes. If life once thrived...
...different from the rest of the country. It's in part a remnant of the conservative Southern Democrats of old and partly the result of Texans seeing themselves as a state apart. As one political analyst told CNN Tuesday night, "Texas Democrats are like Texas Republicans wearing a thin layer of paint." Leadership in both parties bow equally deeply to the twin deities of conservatism: Tax cuts and less government. And certainly Bush's confabs with Speaker Laney, long considered a key broker of bipartisan support for Bush's proposals, have not prepared him for debates with Dick Gephardt...