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Gizmorama - Living upside-down helps spiders' energy
"The Cutting Edge of Science Fact and Science Possibilities"
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Good Morning,
TGIF! I hope you have enjoyed this weeks articles. Thanks
to everyone who wrote in this week with comments. Have a
great weekend.
See you Monday,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
Email your comments
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Gizmorama forum. Check it out here...
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NASA to televise Jules Verne maneuvers
The U.S. space agency said it will televise a series of
maneuvers by the European Space Agency's Jules Verne spacecraft
next week. The automated transfer vehicle, or ATV, is to begin
a series of automated approaches in preparation for an eventual
docking with the International Space Station. NASA Television
will broadcast the most critical maneuvers on its Web site
March 31 and April 3, with commentary from controllers at the
National Aeronautics and Space Administration's Johnson Space
Center in Houston. The March 31 coverage will begin at
10 a.m. EDT as the ATV begins an approach to the station from
a distance of two miles. It will move to within 36 feet of the
station before an abort signal is sent to move the ATV away
from the complex for its final approach three days later. The
maneuvers will test systems required for a safe automated
docking. On April 3, NASA TV coverage will begin at 7 a.m. EDT
as the cargo ship prepares for a 10:40 a.m. EDT docking. The
ATV will remain at the space station until early August, when
it will undock and burn up after entering the Earth's atmosphere.
NASA-TV is available at
http://www.nasa.gov/multimedia/nasatv/index.html.
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Living upside-down helps spiders' energy
A Spanish- and Croatian-led study suggests spiders that live,
feed and walk upside-down have a high energy efficiency. The
majority of land animals evolved to use the ground as the
main support for their motion, the scientists said, but many
spider species spend most of their lives hanging suspended by
their legs, and "walk" by swinging under the influence of
gravity. The researchers studied more than 100 spider species,
comparing how they handle both types of movement. "We
discovered spiders that live upside-down have evolved
disproportionately longer legs relative to 'normal' spiders,
which enables them to move faster while bridging than while
'normally walking' on the ground," said Jordi Moya-Larano of
the Spanish Higher Council for Scientific Research, who led
the study. "Particularly 'clumsy' walkers are larger spiders,
because their long legs -- otherwise so convenient for
bridging -- do not allow an easy lifting of their relatively
large body mass," said Moya-Larano. "With this research we
finally proved the energetic efficiency of such motion stems
from the same physical principle used to run the grandfather's
clock -- motion of a pendulum under the influence of gravity,"
said researcher Dejan Vinkovic, an astrophysicist from Croatia.
The findings are reported in the online journal PLoS One.
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Heart failure may be treated in the brain
A British study suggests cardiac medicines known as beta-blockers
might heal the heart via the brain when administered during
heart failure. Up to now medical scientists have believed
beta-blockers -- drugs that slow heart rate, lower blood
pressure, control angina and help protect against from heart
attack -- worked directly on the heart. But researchers at
University College London said the drugs might also act via
the brain, suggesting future cardiovascular disease therapies
might target the central nervous system. The study, based on
a rat model of postmyocardial infarction-induced heart failure,
discovered the beta-adrenoceptor blocker metoprolol acts
directly in the brain to slow the progression of heart
failure. "Our study shows the importance of the brain in
regulating the cardiovascular system," said Professor
Mike Spyer, co-author of the research. "This is often ignored
by cardiologists who concentrate on the dynamics of cardiac
contraction and the receptors on the heart that influence
this, rather than how the nervous innervation of the heart
is regulated." The UCL findings appear in the journal
Circulation Research.
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