Vol. 159 No. #13
Archive Issues Modal Example

More Stories from the March 31, 2001 issue

  1. Earth

    Leaden calcium supplements

    Consuming calcium along with lead limits, and may prevent, the body's absorption of the toxicant.

  2. Earth

    POPs in the butter

    Governments may be able to monitor trends in the release and transport of persistent organic pollutants by sampling butter.

  3. Distressed amoebas can call for help

    Amoebas having trouble dividing produce a chemical signal that draws other amoebas to the scene.

  4. DNA-cutting enzyme looks like scissors

    One type of restriction enzyme not only cuts a DNA strand but also looks like a pair of scissors.

  5. Gene found for chloroplast movement

    Scientists have found the gene that directs chloroplasts to dance out of a cell's shaded edges to soak up the sun or back into that shade when the light is too intense.

  6. Depression linked to heart deaths

    In a community sample, people suffering from moderate to severe depression exhibited an elevated death rate from heart disease over a 4-year study period, even if they had no discernable heart disease to begin with.

  7. Dyslexia gets a break in Italy

    Although dyslexia involves a common disruption of reading-related brain activity, the reading performance of people with dyslexia appears to improve if they use a language that has consistent spelling rules.

  8. Astronomy

    Starry Data Support Revved-Up Cosmos

    Astronomers have confirmed one of the weirdest properties of the universe: Some mysterious force is pushing galaxies apart at a faster and faster rate.

  9. Health & Medicine

    Urine tests can foretell bladder cancers

    U.S. and Chinese researchers find that two unconventional urine tests can often predict when a person is developing bladder cancer even before tumors appear.

  10. Earth

    Ancient tree rings reveal past climate

    Using tree-ring analysis, an international team of researchers has reconstructed the earliest record of annual climate variation.

  11. Bacterial cells reveal skeletal structures

    The finding of a cytoskeleton in Bacillus subtilis bacteria eliminates a fundamental difference between bacteria and higher (eukaryotic) cells.

  12. Earth

    Microbes put ancient carbon on the menu

    Scientists have found microorganisms within Kentucky shale that are eating the ancient carbon locked within the rock, a previously unrecognized dietary habit that could have a prevalent role in the weathering and erosion of similar sedimentary rock at many other locations.

  13. Physics

    Moon may radio cosmic rays’ biggest hits

    Efforts to use the moon to detect the highest-energy cosmic rays get a boost from an experiment showing that gamma rays zipping through a giant sandbox cause the kind of microwave bursts moon-watchers are hoping to see.

  14. Touching legs turns shy locusts gregarious

    Researchers have discovered that sensing repeated touch on the hind leg triggers a shy, green locust to flip into swarming mode.

  15. Health & Medicine

    Breathing on the Edge

    Researchers are exploring how both sea-level lowlanders and high-altitude natives cope with low oxygen levels.

  16. Health & Medicine

    Blood Relatives

    After decades of research, several companies are about to release the first line of artificial blood products.