Word: strains
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Dates: during 1960-1969
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...long been concerned by the dangers of wholesale, haphazard vaccinations (TIME, May 20), has been working for 20 years to devise a safer vaccine. To the American Pediatric Society in Atlantic City he reported the success that he and his colleague have achieved. Starting with a standard strain of cowpox virus grown in calves, they repeatedly grew it in a series of fertilized eggs. The vaccine from the virus harvested from the last eggs in the series had about the same potency as the standard calf-lymph material and could be given by the usual multiple-puncture method, or injected...
Joseph Dwyer as Florestan had the task of singing what is perhaps the most difficult tenor aria in all opera. "Gott. welch' Dunkel hier" really has too many A's and and Bb's for anyone to cope with and Dwver showed severe signs of strain. Nonetheless he sand with emotion, a quality that had been lacking in the opera up to that point, especially in the men's chorus and the ensembles...
Mary Sindoni as Leonora-Fidelio was the musical heroine of the evening. As lovely vocally as in appearance, she sang the soprano role with taste, showing remarkably little strain in the high register and shifting effortlessly from one register to the other. James Parks as the wicked Governor Pizarro was dramatically the most successful of the soloists. He achieved a characterization where the others only sang well. This is not to slight his vocal capabilities--a bass-baritone, he took the high A in "Ha! Welch'ein Augenblick" and held it painlessly. The only singers supposed to be able...
...through the World Bank only if an increased share of the bank's loans was used to buy U.S. products. Moreover, Washington insisted that the U.S. share of such "soft loan" largesse be trimmed from its present 42% to 40%. However unpopular abroad, such restrictions would minimize the strain foreign aid places on the U.S. payments deficit...
...reproduce itself. Two species are marked as distinct if mixed members either will not mate or cannot produce fertile male and female offspring. Thus the horse and the donkey are separate species because their issue, the mule, is always sterile. In the case of the fruit flies, the Llanos strain was capable of producing fertile young with other strains in 1958, but when they were remated later, the males of the isolated group could not sire fertile sons with any females except those of their own strain...