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  • chromosomes
Your search has returned 32 articles:
  • Say What?

    Chromothripsis

    The catastrophic shattering of a chromosome, which can spark cancer development. All or part of a chromosome may break into pieces, some of which reassemble. Leftover fragments can form DNA circles (colored dots, above) that replicate wildly. If the circles contain cancer-causing genes, their proliferation fuels tumor growth. Disintegrating chromosomes may be the cause of many childhood cases...

    06/29/2013 - 00:00 Genetics
  • News

    DSM-5 enters the diagnostic fray

    To a cacophony of boos, so-whats and even a few cheers, the American Psychiatric Association released the fifth edition of its Diagnostic and Statistical Manual of Mental Disorders, DSM-5, on May 18 at its annual meeting in San Francisco.

    Controversy always flares when psychiatrists redefine which forms of human suffering will count as real and reimbursable by medical insurance....

    06/14/2013 - 10:44 Mental Health
  • Letters to the Editor

    Letters to the editor

    Invertebrate enigmas I found the recent article “Evolutionary enigmas” (SN: 5/18/13, p. 20) fascinating because I know of another example of an invertebrate animal possessing a “strictly vertebrate” quality. As a high school human anatomy and physiology teacher, I sometimes have my students test the effects of the constituents in cigarette smoke on live Daphnia heart rates. These arthropods...

    06/13/2013 - 15:51
  • Balloon Clears Arteries

    A tiny balloon inserted into dangerously clogged arteries at the tip end of a long tube is saving lives by sweeping away the blood clots. A 29-year-old resident in surgery invented the device…. It has been used on 22 patients at the Good Samaritan Hospital in Cincinnati. Dr. Thomas J. Fogarty, now at the University of Oregon Medical School, originated the new … balloon-catheter...

    06/13/2013 - 15:46 Biomedicine
  • People

    Tim Samaras, 1957–2013

    As a child, Tim Samaras frustrated his parents by sneaking kitchen appliances into his bedroom to dismantle them. One day his mother had to coax him to come watch a movie musical with her. It was The Wizard of Oz, and the 9-year-old sat transfixed throughout the tornado scene. As he recalled last year, his only thought was: “I’ve got to take that apart!” For much of the last two decades, the...

    06/13/2013 - 15:34 Science & Society
  • Reviews & Previews

    A Tale of Seven Elements

    The periodic table, which arranges elements based on chemical behavior and physical properties, is a triumph of science. Yet the first table, developed in the late 1860s, was riddled with gaps created by undiscovered elements.

    By the time researchers recognized in 1913 that elements should be arranged by atomic number (the number of protons in their nuclei) rather than by atomic...

    06/13/2013 - 15:28 Chemistry
  • Reviews & Previews

    Math on Trial

    “Torture numbers and they will confess to anything,” author Gregg Easterbrook once wrote in a magazine piece on climate change. But his quip could have been thesubtitle for this new book on the abuse of numbers in the courts.

    Its authors, mother-daughter mathematicians, belong to a research group devoted to improving the use of statistics in criminal trials. Each chapter focuses...

    06/13/2013 - 15:24 Numbers
  • Feature

    In the Eye of the Tiger

    There is no shortage of mosquitoes in North America, and adding one more variety might seem like just a minor uptick in summertime’s itchy-scratchy. But the Asian tiger mosquito, Aedes albopictus, comes with some particularly irritating characteristics. It’s an aggressive hit-and-run biter that frequently lives in close contact with humans. It’s a daytime feeder that dines on humans, dogs,...

    06/13/2013 - 11:19 Animals
  • Feature

    Hard times for theorists in a post-Higgs world

    At 5 a.m. last Fourth of July, Flip Tanedo rolled out of bed after an hour of repeatedly smacking his alarm clock’s snooze button. Rousting himself at dawn would be worth it, he hoped, because what he was about to hear was likely to have a huge bearing on the course of his career.

    Tanedo, a fifth-year theoretical physics Ph.D. candidate at Cornell University,...

    06/13/2013 - 11:02 Physics
  • Feature

    Mystery Meteorite

    There are rocks from the moon, rocks from Mars — and now, just maybe, a rock from Mercury.

    In early 2012, a nomad in the western Sahara spotted some green stones scattered on the sand. Knowing that the empty desert was a good place to find rocks from space, and that meteorite dealers would pay good money for them, he picked up about three dozen that looked related.

    By spring...

    06/13/2013 - 10:32 Planetary Science