Issue Date: Aug 15, 2000
Radioisotopes are used for a variety of diagnostic tests in medicine. Now D Murnick of Rutgers University, USA, and colleagues have pioneered the use of stable isotopes -- those that are not radioactive -- as a tracer in medicine. One application is the development of a fast, inexpensive and safe test for ulcer causing bacteria in the stomach. The patient is fed a small amount of urea that is labelled with carbon-13. The bacteria, if present, breaks the urea to ammonia and carbon dioxide, with the carbon dioxide containing carbon-13 together with the more common carbon-12 isotope.
Recent Supreme Court order in Vedanta case holds hope for tribal community life
Butterflies on the roof of the world is a vivid and engaging narrative of the author's rendezvous with the butterflies and moths in particular, and nature in general