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...improvements that substantially increased the variety of reactions that could be studied this way. The method is analogous to that of particle physicists, who accelerate beams of speeding subatomic particles, smash them together or into a target, and then study the resulting debris. Herschbach's and Lee's beams consist of molecules instead of subatomic particles; when the molecules collide at about the speed of sound, they react to form new molecules, which spray in different directions. By looking at what new molecules have been formed, where they end up and what kind of energy is emitted or absorbed, chemists...
Perhaps the most important development in house play this year has been a new rule mandating that each squad consist of at least 15 players. That dictum has lead to the merger of the Adams and Mather squads and of the Eliot and Lowell teams--and has resulted in the formation of a Currier House team for the first time in years...
Some viruses consist of a segment of double-stranded DNA surrounded by a protein skin. When they invade a cell, the DNA takes over the cell's genetic machinery and orders it to produce copies of the virus, which escape to infect other cells. The victim cell is often killed in the process. But the AIDS virus is a so-called retrovirus and contains single-stranded RNA. Alone, RNA lacks the ability to conquer cells, but retroviruses carry an enzyme called reverse transcriptase. When the AIDS virus invades an immune-system T cell, the enzyme enables the viral...
...symposia, which consist almost exclusively of panel discussions moderated by Harvard professors, will begin at 2 p.m. today and will be held at six different time periods on September 4-7. Each seminar lasts approximately an hour and a half. Admission is free, but only ticket-holders will be admitted...
...School's 50th anniversary festivities, scheduled for September 4-6, will consist of seven symposia on topics ranging from nuclear war to Medicare and two special evening forums. In addition, the K-School will publish a commemorative book as well assponsor debates in New York and San Franciscoduring the fall...