Gizmorama
February 1, 2010
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Good Morning,
Scientists have discovered that blood platelets can repro-
duce; a finding that has defied what was thought to be
impossible because the platelets lacked a nucleus. Find out
how this process is possible without the nucleus and more
details on this "groundbreaking" find in the last article.
Until Next Time,
Erin
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Cassini spots mystery pattern on Titan
PASADENA, Calif. - NASA's Cassini spacecraft has found yet
another mystery to be solved -- hills with a wrinkly radial
pattern discovered on Titan, Saturn's largest moon. The
grooved mounds, located in a northern hemisphere region
known as Belet, are about 50 miles wide and about 200 feet
high. NASA scientists said the shapes of the landscape
features have not been seen on Titan before, although they
bear similarity to spidery features known as coronae on
Venus. A corona is a circular to elliptical feature thought
to result from the flow of heat in a planet's interior.
"This star-shaped pattern of the hills indicates something
significant happening, ..." said Steve Wall of NASA's Jet
Propulsion Laboratory. "It might be caused by tectonic
forces, such as the forces that pull the crust of a planet
apart, or rainfall that leads to erosion, or an ice intrusion
like a dike." All such forces produce grooves on Earth's
surface, but Wall said NASA scientists are not yet sure what
is happening on Titan.
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Study maps birds' auditory brain pathway
DURHAM - Duke University Medical Center scientists say
they've identified an auditory feedback pathway in the song-
bird brain that is needed to learn a song. Professor Richard
Mooney, senior author of the study, said the research lays
the foundation for improving human speech, for example, in
people whose auditory nerves are damaged and who must learn
to speak without the benefit of hearing their own voices.
"This work is the first study to identify an auditory feed-
back pathway in the brain that is harnessed for learned vocal
control," Mooney said, noting the research team also devised
a way to alter the activity of the neurons to prove they
interact with the motor networks that control singing. The
study was reported in the Jan. 13 online edition of the
journal Neuron.
Proba-2 takes a new look at the sun
PARIS - The European Space Agency says its Proba-2 satellite
has started observing the sun, while also demonstrating tech-
nologies for future space missions. Proba-2, the second in a
low-cost series of satellites that are used to validate new
technologies while performing scientific projects, was
launched Nov. 2. The ESA team directing the mission announced
it is extremely happy with the satellite's first three months
in orbit. Constructed for ESA by Belgian firm Verhaert Space,
the spacecraft is less than 35 cubic feet in size and carries
17 new technologies that are being demonstrated before being
adopted by full-sized spacecraft, the ESA said. In addition
to its experimental payloads, Proba-2 is hosting four new
instruments focused on the sun and space weather. "It is a
full space telescope the size of a wide shoe box," said David
Berghmans of the Royal Observatory of Belgium, which directs
Proba-2's solar monitoring instruments. Proba-1, launched in
2001, established the principle of using small satellites for
technology demonstrations. The ESA said Proba-3 will be a
double spacecraft, designed to study the solar corona while
testing precision formation-flying techniques.
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Study finds blood platelets can reproduce
SALT LAKE CITY - In what's described as a groundbreaking
discovery, a U.S.-led research team says it found blood
platelets have the ability to reproduce in the circulation.
The scientists, led by Dr. Hansjorg Schwertz and Professor
Andrew Weyrich of the University of Utah's School of Med-
icine, explained platelets develop from cells found in bone
marrow. But because the platelets lack a nucleus where DNA
is found, they were previously considered incapable of re-
producing themselves. However, the scientists in the study
discovered platelets are capable of giving rise to new
platelets. "Cells with nuclei typically split into two uni-
form daughter cells that share identical genetic infor-
mation," Schwertz said. "In our experiments, we found that
platelets increase in number by generating beaded extensions
that resemble a pearl necklace. Development of these exten-
sions, which contain two or more new platelets, does not
require a nucleus." Weyrich said more research is needed to
understand how platelets reproduce and whether newly formed
platelets are identical to, or distinct from, the platelets
that are formed directly from their bone marrow precursors.
"Nevertheless," he added, "our findings identify a new
function of platelets that has important bench-to-bedside
implications." The study was reported in the Jan. 19 early
online issue of the journal Blood.
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