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Asunto:[LEA-Venezuela] IMPORTANTISIMO: Maiz transgenico contamina plantas lejanas
Fecha:Martes, 4 de Diciembre, 2001  12:48:04 (-0400)
Autor:Interfaz Amazonica <interfaz @.....net>

Bueno, Edinson , traducir un parrafito o dos al dia si se me hace posible,
menos mal... no?

DE SCIENTIFIC AMERICAN:
MAIZ TRANSGENICO CONTAMINA PLANTAS NATIVAS LEJANAS
En noticias que seguramente avivaran las llamas del caliente debate sobre
los cultivos geneticamente modificados, los cientificos han encontrado
evidencia que los genes de plantas geneticamente modificadas se pueden
desperdigar lejana y ampliamente a las plantas nativas. El maiz salvaje de
las remotas montañas de Oaxaca, Mejico, contienen DNA transgenico. Esto,
notan los investigadoras,  apoya preocupaciones de que tales contaminaciones
sin intencion pueden amenazar la diversidad de los cultivos naturales...


-------------------

________________________________________________________________
ScientificAmerican.com -- WEEKLY REVIEW       December 04, 2001
________________________________________________________________

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IN THIS ISSUE
-------------------------
** GM CORN CONTAMINATES DISTANT NATIVE PLANTS
** HUBBLE DETECTS DISTANT PLANET'S ATMOSPHERE
** BRAIN SCANS SHOW DEAF SUBJECTS 'HEAR' VIBRATIONS
** LAND SIZE LIMITS BODY SIZE OF BIGGEST ANIMALS
** NEW STUDIES SHARPEN PICTURE OF NEAR-EARTH ASTEROIDS

Also...ASK THE EXPERTS
-------------------------
--HOW DOES SOMEONE INHERIT EYES OF DIFFERENT COLORS?

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=====================================================

-------------------------- WEEKLY REVIEW ---------------------------

** GM CORN CONTAMINATES DISTANT NATIVE PLANTS
In news that will surely fan the flames of the heated debate over
genetically modified crops, scientists have found evidence that genes
from GM plants can spread far and wide to native ones. Wild corn from
the remote mountains of Oaxaca, Mexico contains transgenic DNA.
This, the researchers note, bolsters concerns that such unintentional
contamination can threaten the genetic diversity of natural crops.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*WDDA


** HUBBLE DETECTS DISTANT PLANET'S ATMOSPHERE
Astronomers using the Hubble Space Telescope have directly detected
the atmosphere of a planet outside our solar system that lies more than
150 light-years away. The discovery of the element sodium in the planet's
atmosphere, NASA scientists say, is the first step in measuring more
complex chemical compositions of planetary atmospheres far from Earth.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUUA


** BRAIN SCANS SHOW DEAF SUBJECTS 'HEAR' VIBRATIONS
Deaf people use the region of the brain associated with hearing to sense
vibrations, a new study shows. Because vibrations and sound have similar
features, the researchers note, it makes sense that the brain can adapt
to replace one with the other in a processing region. What's more, it may
be helpful to expose deaf children to music and vibrations converted from
speech sounds early in life while their brains are developing.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUVA


~~~~~~~~~~~~~~~~~~~~ BOOKSTORE ~~~~~~~~~~~~~~~~~~~
Visit our EDITORS' HOLIDAY FAVORITES for titles that are sure to
please the science and technology fans on your gift list.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUWA

FROM OUR EDITORS' HOLIDAY FAVORITES:

IN THE PRESENCE OF DINOSAURS by John Colagrande, Larry Felder
(Illustrator) and Jack Horner

From mating patterns and habitats to nesting colonies and physiognomy,
IN THE PRESENCE OF DINOSAURS takes readers into the world of dinosaurs
like a field guide, traveling from present-day Arizona to Connecticut, the
Triassic to the Cretaceous.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUXA
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

** LAND SIZE LIMITS BODY SIZE OF BIGGEST ANIMALS
The sizes and types of local land animals vary greatly from place to
place, prompting scientists to question what controls the success of
animals of certain sizes over others. A new report shows that the size
of a landmass may limit the maximal body size of its top animal.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUYA


** NEW STUDIES SHARPEN PICTURE OF NEAR-EARTH ASTEROIDS
A trio of new studies is helping to explain how asteroids near Earth
orbit the sun and how they ended up there in the first place. The
picture emerging is one in which asteroids in the belt between Mars
and Jupiter collide, shatter and then clump together into families,
migrate into regions of space where the gravity of Jupiter can jar
them loose from their orbits and finally take up residence close
to Earth.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUZA


ASK THE EXPERTS
====================================================
HOW DOES SOMEONE INHERIT EYES OF DIFFERENT COLORS?

Susan J. Gross, co-director of the Division of Reproductive Genetics
at the Montefiore Medical Center and an associate professor at the
Albert Einstein College of Medicine, provides an explanation.
http://sciam.rsc03.net/servlet/cc4?lJpEVX*pgmLkMHTQJHgmOEgLm*z*XUAA
====================================================


AND REMEMBER...
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