Findings

Science  17 Jun 2011:
Vol. 332, Issue 6036, pp. 1366
  1. Tut Tomb's Spotty History

    CREDIT: ROBERT JENSEN/J. PAUL GETTY TRUST

    King Tutankhamen's tomb was never plundered, so when Howard Carter discovered it in 1922, the burial chamber was nearly intact. But it had been invaded: Hundreds of brown spots freckling the chamber's painted walls indicate that bacteria or fungi entered the tomb before his subjects sealed it. The spots are visible in photos taken during the tomb's unveiling, but their origin has mystified scientists.

    Last year, researchers from the Getty Conservation Institute, which helps the Egyptian Supreme Council of Antiquities maintain the tomb, scraped material from the spots and sent it to Harvard University microbiologist Ralph Mitchell, who's made a career linking microbial and human history. Mitchell and colleagues identified no living microbes, but they did find melanin pigments, which are frequently left behind by bacterial or fungal growth. Mitchell postulates that when Tut died suddenly as a teenager, his burial was rushed and the tomb was sealed before the paint could dry. Bacteria or fungi could have thrived for years in the moist environment until the tomb dried out.

    Mitchell hopes further protein and DNA analysis of the spots will reveal more about the organisms that left their mark. “This is still a mystery,” he says.

  2. Clues to Autism Emerge In Protein Network

    Autism is a puzzle for scientists, with dozens of “suspect genes” scattered among various types of the disorder and showing up in the DNA of only a handful of patients. But now researchers have identified a densely connected network of proteins that may help reveal how autism develops.

    Proteins working together inside cells sometimes physically touch each other; often, many of them will also link to a few central proteins that play a key role in a particular biological process, forming what researchers call an “interactome.” Using a screening process to find interactomes relevant to autism, Huda Zoghbi, a neurobiologist at Baylor College of Medicine in Houston, Texas, and colleagues caught 500 proteins that connected with 26 proteins produced by different autism genes and also interacted with each other.

    The proteins play key roles in a complex process, one that likely causes a problem at the synapses of people with autism, Zoghbi says. Her team reported its findings online 8 June in Science Translational Medicine. Pathways shared by different types of autism are promising targets for drug development, she adds. http://scim.ag/autism-proteins

  3. Can Brain Scans Predict Music Sales?

    A new study suggests that brain scans can reveal information about consumer preferences that couldn't be gained from old-fashioned marketing research methods like surveys and focus groups.

    CREDIT: PETER WAFZIG/GETTY IMAGES

    In 2007, neuroeconomist Gregory Berns of Emory University in Atlanta used functional magnetic resonance imaging to monitor brain activity in 27 teenagers as they listened to dozens of songs from the MySpace pages of unsigned artists. When one of the songs (“Apologize” by OneRepublic) became a huge hit, Berns reexamined his data to see if anything could have predicted it. One hot spot was the nucleus accumbens, a component of the brain's reward circuitry, he reports in a paper in press at the Journal of Consumer Psychology. The average activity elicited by a song in this region correlated with the song's sales over the next 3 years. Intriguingly, the brain scans predicted commercial success better than whether the subjects reported liking a song.

    “This is a really cool result,” says Brian Knutson, a cognitive neuroscientist at Stanford University in Palo Alto, California. He suggests that activity in the nucleus accumbens may provide a pure indication of how much people want something, unencumbered by economic and social considerations. http://scim.ag/brain-music

  4. New Particle a No-Show In Second Act

    It would have been the feel-good science story of the year. Two months ago, the 500 physicists working with the massive CDF particle detector at Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, reported hints of a bizarre new particle (Science, 15 April, p. 296). That unexpected find would have marked a triumph for the 25-year-old Tevatron atom smasher, which feeds CDF and will shut down this year, having been surpassed by a more-powerful atom smasher in Europe. Alas, physicists working with CDF's sibling at the Tevatron, the D0 detector, see no sign of the particle, which appeared to weigh about 160 times as much as a proton. That suggests the first team was misled by some unaccounted “systematic” effect in their analysis and that the particle doesn't exist.

    Still, it's far from clear why the experiments disagree, says Robert Roser, a Fermilab physicist and co-spokesperson for the CDF team. “The fact that they don't see [the peak] means that the situation is muddy and that you have to get down in the mud and wrestle around and figure it out,” he says. Mud wrestling over systematic errors may be less exciting than it sounds.

    http://scim.ag/Fermilab

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