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...Drs. Rock and Pincus report "practically 100 per cent contraception" on the basis of four field trials involving 1200 in Puerto Rico and Haiti. Other investigators were at first what less successful, but with improved techniques, achieved perfect reliability. At present, for optimal results, the must be taken once a day, starting on the day after the menstruation and continuing for 20 days. A menstrual-like gins a few days after the last pill is taken. Five days later the should be resumed. Ironically, when one stops taking the greater than normal fertility sometimes results. Thus, the may enable...
...scientists urgently needed one vital component: a chemical element that was fissionable (explosive) but not so radioactive that it would disintegrate before the big bang was touched off. The bomb builders found what they wanted at the University of California's famed Radiation Laboratory at Berkeley, where Drs. Glenn Seaborg and Edwin McMillan had put together some synthetic plutonium, element 94. Until then, plutonium was no more than a lab curiosity, but it proved to be properly fissionable, and it was so slightly radioactive that only half of it would disintegrate in 24,100 years...
...bearded Surgeon Petrucci, 38, and his coworkers, Drs. Laura de Pauli and Raffaele Bernabeo, artificial insemination started as a sideline. They began growing test-tube human embryos three years ago, in a tiny lab behind Petrucci's Bologna office, to get newborn cells for experiments in antibody response to transplanted tissue. "We had no intention of creating a 'man in the box,' " says Dr. Petrucci. "Far from it. The problem today is to limit births, not increase them." The doctors collected live ova from Petrucci's female patients during hysterectomy or after sudden death. Since...
Monitoring the operation through an image intensifier-a refined fluoroscope that produces an X-ray image 1,500 times Drighter than the old-style fluoroscopic screen-Drs. Sones and Shirey then release a tiny amount of radiopaque dye through the catheter into the aorta in order to locate the spot at which right and left coronary arteries join the circulation's main stem. "The rest," says Sones, 'requires only a little bit of simple dexterity." The catheter is successively slipped into both coronary arteries, and small injections of dye (2 cc. to 5 cc.) are sufficient to silhouette...
...Sones admits that his technique involves some risk. Although the catheter is less than half as thick as an average coronary artery, it can still obstruct the flow of blood into the heart. Throughout the operation, Drs. Sones and Shirey monitor the pressure of the blood against the catheter's tip. Explains Sones: "If the pressure starts to flatten out, we know the tip has obstructed the artery or one of its branches. Then we have from ten to 30 seconds to get it out before the heart is starved for blood and the patient has a heart attack...