Gizmorama
November 10, 2009
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Good Morning,
A new stem cell discovery unlocks some unknown factors to
human development. Read all about the study and what it
means for future research in the first article.
Until Tomorrow,
Erin
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Embryonic stem cells become germ cells
STANFORD, Calif. - Stanford University researchers say
they've discovered how to transform human embryonic stem
cells into germ cells. The study, funded in part by the
National Institutes of Health, allows scientists to observe
germ cells -- the cells that eventually produce sperm and
eggs -- that were previously inaccessible. "This achievement
opens a new window into what was only recently a hidden stage
of human development," said Dr. Susan Shurin, acting director
of the Eunice Kennedy Shriver National Institute of Child
Health and Human Development. "Laboratory observation of
human germ cells has the potential to yield important clues
to the origins of unexplained infertility and to the genesis
of many birth defects and chromosomal disorders." The study
conducted by Kehkooi Kee, Vanessa Angeles, Martha Flores, Ha
Nam Nguyen and Renee Reijo Pera, all of Stanford University
School of Medicine appears in the early online edition of
the journal Nature.
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Fermi captures space-time theory evidence
WASHINGTON - NASA says its Fermi Gamma Ray Space Telescope
ended its first year of operation by obtaining a measurement
that is evidence of the structure of space-time. During its
initial year, Fermi mapped the extreme sky with unprecedented
resolution and sensitivity, NASA said, capturing more than
1,000 discrete sources of gamma rays -- the highest energy
form of light. But capping those achievements is a measure-
ment that provides rare experimental evidence about the very
structure of space and time, unified as space-time in the
theories of the late theoretical physicist Albert Einstein.
On May 10, Fermi and other satellites detected a short gamma
ray burst that scientists think occurs when neutron stars
collide, NASA said. Of the many gamma ray photons Fermi de-
tected from the 2.1-second burst, two possessed energies
differing by a million times. Yet, scientists said, after
traveling some 7 billion years, the pair arrived just nine-
tenths of a second apart. "This measurement eliminates any
approach to a new theory of gravity that predicts a strong
energy dependent change in the speed of light," said Peter
Michelson, Fermi's principal investigator at Stanford Uni-
versity. "To one part in 100 million billion, these two pho-
tons traveled at the same speed. Einstein still rules."
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Technology quickly spots microbial life
PASADENA, Calif. - A NASA scientist in California says he
has developed a technology that can rapidly determine if
there is any microbial life on a spacecraft. The microscope-
based technology, developed by Adrian Ponce, deputy manager
of NASA's Jet Propulsion Laboratory in Pasadena, Calif.,
might also help military test for disease-causing bacteria
and could also be useful in medical, pharmaceutical and other
fields, officials said. "NASA adheres to international pro-
tocols by striving to ensure that spacecraft don't harbor
life from Earth that could contaminate other planets or moons
and skew science research," Ponce said. "Microbes known as
bacterial endospores can withstand extreme temperatures,
ultraviolet rays and chemical treatments, and have been known
to survive in space for six years. This resilience makes them
important indicators for cleanliness and biodefense." He said
bacterial endospores are the toughest form of life on Earth,
"Therefore, if one can show that all spores are killed, then
less-resistant, disease-causing organisms will also be dead."
Ponce co-authored a paper on the new technology, called
Germinable Endospore Biodosimetry, with Pun To Young, a post-
doctoral student at the California Institute of Technology.
The paper appeared in the journal Applied and Environmental
Microbiology, as well as in Microbe, a magazine of the
American Society for Microbiology.
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