Gizmorama
December 28, 2009
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Good Morning,
Scientists have found that the source of methane on Mars
could not have come from meteorites, which leave open the
possibility of life on the red planet. Check out the first
article for details.
Until Next Time,
Erin
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Methane study favors life on Mars theory
LONDON - Imperial College London scientists say they have
ruled out the possibility that methane is delivered by
meteorites into Mars' atmosphere. That finding, the re-
searchers note, raises fresh hopes that the gas might be
generated by life on the red planet. Scientists said methane
on Mars is being constantly replenished by an unidentified
source. Researchers had thought meteorites might be respon-
sible because, when the rocks enter the planet's atmosphere,
they're subjected to intense heat, causing a chemical reac-
tion that releases methane and other gases into the atmos-
phere. But now the Imperial College London study has shown
the volumes of such meteoritic methane are too low to main-
tain the current atmospheric levels of methane. Previous
studies have also ruled out the possibility the methane is
created through volcanic activity. That, the researchers
say, means either there are microorganisms living in the
martian soil producing methane gas or methane is being pro-
duced as a by-product of reactions between volcanic rock
and water. Professor Mark Sephton, a co-author of the study,
noted: "This work is a big step forward. As Sherlock Holmes
said, eliminate all other factors and the one that remains
must be the truth. The list of possible sources of methane
gas is getting smaller and excitingly, extraterrestrial life
still remains an option. Ultimately the final test may have
to be on Mars." The research appears in the journal Earth
and Planetary Science Letters.
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Neuron grafts help rats regain lost memory
BANGALORE, India - Scientists in India say an injection of
nerve cells into damaged areas of the brains of rats restores
the animals' spatial memory and their ability to learn. Sci-
entists at India's National Institute for Mental Health and
Neuro Sciences and the National Center for Biological Sci-
ences injected a chemical into 48 adult rats that destroyed
neurons in the hippocampus, a structure in the brain charac-
terized by the scientists as the seat of learning and memory.
The researchers said they then transplanted hippocampal
cells from newborn mice into the hippocampi of half the
brain-damaged rats. After two months, the scientists measured
the learning and memory of the rats by their performance in
two common maze tests. Results showed rats given the trans-
planted cells fully recovered their capacity to learn and
remember. In contrast, the brain-damaged rats not given the
transplanted cells failed to recover, and had many problems
learning how to navigate the maze. The scientists said the
transplanted cells led to the secretion of growth factors
that promoted development of neurons and other cells that
give rise to neurons. The findings appear in the journal
Behavioral Neuroscience.
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Calif. academy new species list released
SAN FRANCISCO - California Academy of Sciences researchers
say they discovered 94 new species this year, including 65
arthropods, 14 plants, eight fishes and five sea slugs.
Academy researchers said their findings, published in 29
different scientific papers, add to the record of life on
Earth and will inform future studies on biodiversity, evo-
lution, and conservation. "Humans rely on healthy ecosystems,
made up of organisms and their environments," said David
Mindell, the academy's dean of science and research collec-
tions. "Creating a comprehensive inventory of life on our
planet is critical for understanding and managing resources.
Yet a great many life-forms remain to be discovered and de-
scribed. The effort to determine the genealogical links
among all life-forms, and describe their distributions,
allows biologists to assess the relative distinctiveness
of groups of organisms and various geographic regions, and
helps determine conservation priorities." Arthropods --
insects, arachnids and their relatives -- are the most
diverse group of animals on Earth. Accordingly, the sci-
entists said more than two-thirds of the new species on
the academy's list are arthropods, including 36 new spider
species from Yunnan Province, China. The California Academy
of Sciences conducts research in 11 scientific fields:
anthropology, aquatic biology, botany, comparative genomics,
entomology, geology, herpetology, ichthyology, invertebrate
zoology, mammalogy and ornithology.
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