Word: electrons
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Dates: during 1970-1979
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...carriers of mass can be further divided into leptons, which do not feel the "strong" force, and hadrons, which do. There are four leptons: the electron, the muon, the electron neutrino and the muon neutrino. There are hundreds of hadrons. The neutron and proton are both hadrons and so are subject to the paull of the "strong" force...
...understand fully how they are assembled and how they function. A primary means of obtaining this knowledge is X-ray diffraction, a process in which molecules are first crystallized, then examined by X rays. The data collected can be analyzed by computer and then used to draw elaborate "electron density" maps from which complex models can be built...
...School professor in charge of the research said yesterday the grant has been very helpful--he's used it to pay for supplies and for the work of biologists, physiologists, medical students and electron microscopes. But M. Judah Folkman, Andrus Professor of Pediatric Surgery, cautioned that the work takes a great deal of time...
...University's seven day-care centers is looking for a new home because of increased radiation from Harvard's Oxford St. electron accelerator...
...quickest and most dramatic tests of all is for certain classes of virus that can be identified by their size and shape. It may take no more than three hours to prepare a specimen for Electron Microscopist Frederick Murphy to magnify up to 200,000 times. If he has caught his prey, its picture can be thrown onto a screen for a roomful of epidemiologists to see. Last week Dr. Murphy prepared such a specimen, and CDC Director David Sencer asked him: "Where is your picture?" A frustrated Murphy replied, "The picture is blank." Dr. Sencer then admitted...