Word: 299th
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Dates: during 1950-1959
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Beadle and Tatum irradiated masses of mold with X rays and searched for mutations in the spores. On the 299th try they got a mold that would not grow unless it was fed vitamin B-6 (pyridoxine). The normal mold makes vitamin B-6 for itself. They traced this deficiency to an X-ray-damaged gene that failed to produce the necessary enzyme (organic catalyst) for producing B6. This provided a means of studying genetic changes by corresponding changes in the organism's ability or failure to produce specific chemicals-thus giving genetics a new exactness and turning...
...start of the experiment, Beadle and Tatum resolved to make at least 1,000 tries before giving up. Such perseverence was not necessary. On the 299th try they found an ailing spore that needed only vitamin B-6 (pyridoxine) to make it grow lustily. When it had mated with a normal mold, it transmitted its need for vitamin B-6 to its descendants in the proper Mendelian manner for a single mutated gene...
...299th Commencement...
This is the 299th commencement in the University's history; they have been consecutive since 1871. A 9 a.m. chapel service in Memorial Church always preceeds the event...
Five consecutive days of activities will precede the University's 299th Commencement which takes place Thursday, June 23, according to plans announced last night. President Conant will deliver the Baccalaureate Sermon in Memorial Church Sunday, while on Monday there will be an oration by Cleanth M. Brooks, professor of English at Yale. Addressing the annual literary exercises of the University Chapter of Phi Beta Kappa in Sanders Theatre, Brooks will speak on "The Present Crisis in Culture...