Uncategorized

  1. Health & Medicine

    Nongene DNA boosts AIDS risk

    People with a newly discovered genetic variation are more vulnerable to HIV infection.

    By Patrick Barry
  2. Humans

    Burdens of knowledge

    Greater understanding of the role of genetics in human diseases presents scientists with ethical dilemmas.

    By Patrick Barry
  3. Health & Medicine

    Salmonella seeks sweets

    A sugarlike substance in the roots of lettuce may attract food-poisoning bacteria.

    By Janet Raloff
  4. Earth

    Groundwater use adds CO2 to the air

    Pumping out groundwater for crop irrigation or industrial purposes releases planet-warming carbon dioxide into the atmosphere.

    By Sid Perkins

  5. 19899

    Soil water picks up carbon dioxide generated when soil organic matter decomposes, and this then escapes to the atmosphere.