Gizmorama
November 23, 2009
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Good Morning,
A historic climate find may mean that life developed on Earth
much earlier than predicted due to easier conditions. This
scientific discovery could change the study of Earth's his-
tory as we know it! Check out the details in the last article.
Until Tomorrow,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
Email your comments=
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Study: Genomes can vary by region
DAVIS, Calif. - U.S. researchers say they've found variations
in genomes among ethnic groups and subgroups, with clear re-
gional differences. University of California-Davis Professor
Michael Seldin and graduate student Chao Tian, along with
Dr. Peter Gregersen of the Feinstein Institute for Medical
Research, analyzed a multi-center genetics study that scanned
the genomes of 4,000 people across Europe and found the regi-
onal differences. The researchers said their findings are
critical in the analysis of genetic studies because not
knowing an individual's ancestry could result in statistical
errors that alter the outcome of the study. "Until now, sci-
entists have depended on a person's knowledge of their ances-
tral roots when they study human populations to look for
risk genes," said Gregersen, head of the Center for Genomics
and Human Genetics at the Feinstein Institute. But he said
even among racial groups there can be significant differences
in the frequencies of certain genetic alleles. The study
appears in the journal Molecular Medicine.
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Scientists use lasers to shine metal molds
AACHEN, Germany - German scientists say they have developed
a way of automating the polishing work required by injection
molds, now done exclusively by hand. The researchers at the
Fraunhofer Institute for Laser Technology in Aachen, Germany,
said polishing injection molds is time-consuming and requires
concentration since any blemish can render a mold useless.
Up to now it has been impossible to use machines for such
work because they cannot get into the curved shapes. But the
researchers, led by Edgar Willenborg, say they found a way to
accomplish the task using laser technology. "The laser beam
melts the surface to a depth of about 50 to 100 micrometers,"
said Willenborg. "Surface tension ensures the liquid metal
flows evenly and solidifies smoothly." As in conventional
grinding and polishing, the process is repeated with in-
creasing degrees of fineness, he explained. Willenborg said
although laser polishing does not achieve the same surface
smoothness as perfect hand polishing, he still sees consider-
able market potential for the system, especially for molds
used in making standard plastic parts. But the high-end lev-
els of smoothness will remain the domain of skilled hand
polishers, he said. Examples of laser polishing will be pres-
ented next month in Frankfurt, Germany, during the Euromold
trade show.
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How some aromas are bound in memories
REHOVOT, Israel - Authors and screenwriters have long been
aware that some odors can spontaneously evoke strong mem-
ories, but Israeli researchers have explained why. Graduate
student Yaara Yeshurun with professors Noam Sobel and Yadin
Dudai of Weizmann Institute of Science in Israel said the
key might not necessarily lie in childhood aromas but rather
in the first time a smell is encountered in the context of a
particular object or event. In a special smell laboratory,
study subjects viewed images of 60 visual objects, each
presented simultaneously with either a pleasant or an un-
pleasant odor generated in a machine called an olfactometer.
Next, the subjects were put in a functional Magnetic Reson-
ance Imaging scanner to measure their brain activity as they
reviewed the images they'd seen and attempted to remember
which odor was associated with each. Then, the whole test
was repeated with the same images, but different odors ac-
companying each. The subjects came back one week later to be
scanned in the fMRI again as they viewed the objects one more
time and were asked to recall the odors they associated with
them, Yeshurun said. The study, published in the Current
Biology, found that after one week, even if the subject re-
called both odors equally, the first association revealed a
distinctive pattern of brain activity, whether the smell was
pleasant or unpleasant.
Life on Earth: Quicker start than thought?
COLLEGE STATION, Texas - U.S. scientists say they've dis-
covered Earth's climate was much cooler than thought bill-
ions of years ago, which may mean life developed earlier
than thought. Researchers from Texas A&M, Yale and Stanford
universities say their findings could change current ideas
about the formation of the earliest life on the planet. The
scientists say they've determined the Earth's climate was
perhaps more than 50 degrees cooler than thought billions
of years ago. That means conditions for life were much
easier, and that life existing at that time was not under as
much stress as previously believed. Texas A&M geobiologist
Mike Tice said the team examined rocks from South Africa
that are known to be about 3.4 billion years old -- among
the oldest ever discovered. They found features in the rocks
consistent with formation at water temperatures significantly
lower than previous studies suggested. "Our research shows
the water temperature 3.4 billion years ago was at most 105
degrees, and while that's potentially very warm, it's far
below the temperatures of 155 degrees or more that previous
research has implied," Tice said. "It means more organisms
may have been around that were not necessarily heat-loving
ones." The study appears in the journal Nature.
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