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Science News Archive January 2008 - Page 2


Page 2 of 17

Blue-eyed humans have a single, common ancestor

A team at the University of Copenhagen discovered that people with blue eyes have a single common ancestor due to a genetic mutation in the OCA2 gene. This mutation resulted in reduced melanin production in the iris, effectively 'diluting' brown eyes to blue. Brown-eyed individuals exhibit more individual variation in their DNA.

SourceUniversity of Copenhagen·JournalHuman Genetics·DateJan 30, 2008

In nature -- and maybe the corner office -- scientists find that generalists can thrive

Researchers design a mathematical model to describe circumstances where generalists can endure and even thrive in what is typically expected to be a specialist-only society. The study's findings suggest that having individuals with diverse skills can safeguard against the possibility that specialists don't complement each other.

SourceOhio State University·JournalJournal of Theoretical Biology·DateJan 30, 2008

Where in the world

Global positioning systems technology can be used to study how children develop spatial awareness and orient themselves in the real world. The study found that children aged three years old could use environmental landmarks to guide their search, improving performance with larger test areas and different colored buckets.

SourceUniversity of Bristol·JournalCognition·DateJan 30, 2008

UMass Medical School study finds patients diagnosed with coronary heart disease continue poor diets

A recent UMass Medical School study found that over 80% of patients diagnosed with coronary heart disease do not improve their diet one year after diagnosis. The study used the Alternative Health Eating Index to assess dietary quality and found that only a small percentage of patients met recommended daily intake levels for fruits, veg...

SourceUMass Chan Medical School·JournalJournal of the American Dietetic Association·DateJan 30, 2008

Paired earthquakes separated in time and space

Researchers discovered a rare doublet earthquake event near Japan, with two large quakes occurring over 60 days apart. The second quake was triggered by bending of the Pacific plate, shedding light on seismic dynamics and potential hazards in regions far from tectonic plate boundaries.

SourcePenn State·JournalNature·DateJan 30, 2008

Anemia treatment may be a double-edged sword

A mouse study reveals that erythropoietin keeps blood vessels alive and growing in the eye, but administering it at the wrong time may worsen diseases. The hormone's effects depend on timing, with early administration potentially slowing disease progression and late administration accelerating it.

SourceBoston Children's Hospital·JournalJournal of Clinical Investigation·DateJan 30, 2008

More religious women less likely to get an abortion

A new study published in Social Science Quarterly reveals that religious women are less likely to obtain abortions compared to secular women. This is because religious women tend to lead more sexually conservative lifestyles, which reduces their likelihood of becoming pregnant before marriage and seeking an abortion.

SourceBlackwell Publishing Ltd.·JournalSocial Science Quarterly·DateJan 30, 2008

Gene predicts heart attack response and cardiac damage

A protein called macrophage migration inhibitory factor (MIF) has been found to activate AMPK, a key regulator of cellular energy balance, protecting the heart from injury during a heart attack. MIF may help identify individuals at higher risk for cardiac damage during a heart attack based on their genetic characteristics.

SourceYale University·JournalNature·DateJan 30, 2008

Smithsonian study: Sediment prediction tools off the mark

A recent Smithsonian study reveals that widely used sediment prediction tools are failing to accurately forecast sediment delivery to the Chesapeake Bay. The researchers suggest a shift in focus towards understanding what happens near streams and during high-level stream events.

SourceSmithsonian·JournalJournal of Environmental Quality·DateJan 29, 2008

DNA (driver of nicotine addiction)

A genetic study of 14,000 people found two genes, alpha 3 and alpha 5 nicotinic receptor subunits, to be associated with an increased risk of heavy smoking. The implicated DNA variants can be used to predict ability to quit using existing medications, potentially leading to more efficient treatment.

SourceMolecular Psychiatry·JournalMolecular Psychiatry·DateJan 29, 2008

NIDA research reveals subconscious signals can trigger drug craving

Researchers used fMRI to show that cocaine-related images stimulate activity in the limbic system, a brain network involved in emotion and reward, even when subjects are unaware they've seen anything. The study suggests new drug treatment strategies by targeting the brain's sensitivity to conditioned drug cues.

SourcePLOS·JournalPLOS ONE·DateJan 29, 2008