Word: positronic
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...cells may have died for the process to be reversed. "If we can come up with better diagnostic procedures, it might be possible to block the progress of AD chemotherapeutically in the next five years." says Gibbs of NIH One promising method is a new scanning process called PET (positron emission tomography), which measures glucose metabolism in living cells. PET-scan studies by Dr. David Kuhl of U.C.L.A., among others, have revealed drastic decreases in metabolism in the brains of AD patients. Kuhl hopes to develop an early diagnostic test so that AD patients can "receive treatment while their brains...
...give cross-sectional views of internal body structures, not just bones but soft tissues as well. But scanning by CAT (for computerized axial tomography) is limited to anatomy. It lets doctors see an organ's shape and form, but cannot tell how it is functioning. PET (for positron emission tomography) allows the physician to examine the brain and body in ways never before possible, providing metabolic portraits, and revealing the rate at which sick and healthy tissues consume biochemicals...
...Positron Emission Tomography. Here the heart is labeled with isotopes that emit charged particles called positrons. A special machine takes simultaneous cross-section views of the heart from different angles; a computer reconstructs the images to give a three-dimensional picture of the heart. "It isn't in clinical use yet, but it's a valuable tool for sophisticated research," says Jeffrey Borer, a cardiologist at New York Hospital...
...teams of experimenters-involving 300 scientists from eight countries, including the U.S.-turned to West Germany's new PETRA colliding beam accelerator in Hamburg. The powerful machine accelerates electrons to energies of 15 billion electron volts and sends them barreling head-on into their antimatter opposites, particles called positrons, coming at high speed from the opposite direction. In the past, when such experiments have been tried with other accelerators operating at lower energies, the debris from the electron-positron collisions has consisted of only two "jets," or streams, of hadrons...
...Caltech that Astronomer Maarten Schmidt discovered the nature of quasars, perhaps the most distant objects in the universe, that Theoretical Physicist Murray Gell-Mann described the way in which more than 100 subatomic particles are related, and that Physicist Carl D. Anderson discovered the positron, a fundamental particle with an electron's mass but a positive charge. The first successful U.S. orbiting satellite, Explorer I, was launched by the school's acclaimed Jet Propulsion Laboratory, which developed the principles that make jet flight possible...