Word: ek
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Dates: during 1970-1979
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...charter's signatories and the list of those detained last week read like an alumnal Who's Who of the Prague Spring-the 1968 reform movement led by Alexander Dubček that was brutally crushed by Soviet troops. In addition to the Kohouts, the chartists include former Foreign Minister Jiři Hájek, former Politburo Member František Kriegel, former Party Secretary Zdenek Mlynar, Student Leader Jiři Mueller, Dramatist Vaclav Havel and the widow and son of Rudolf Slánský, the Czechoslovak Communist Party secretary-general who was executed...
Probably the most important of the additional security steps is the recommendation that all experiments undertaken at the p-3 level use a host-vector system of at least an EK-2 level of biological containment...
...EK-2 host-vector systems refer to Eschirichia coli, a strain of bacteria that rarely survives outside the lab, which can be used as a host bacteria for recombinant DNA experiments...
...requirement of the EK-2 hosts in p-3 labs that left Meselson with his only reservation about the report. "I think the guidelines they set up would be safe for p-4 experiments," Meselson said Wednesday, adding that he didn't think the weak strain EK-2 requirement was used at any of the other 12 research sites funded...
...added the EK-2 stricture was originally proposed in a University of Michigan study that recommended the use of Eschirichia coli at all lab levels, from p-1 to p-4. It was limited by Michigan regents to p-3 and p-4 levels to save money, Hayes said...