Threonine Analogue Resistant Mutants of Escherichia coli K-12

Mutants of Escherichia coli K- 12 resistant to a threonine analogue (ot-amino-I]-hydroxy valeric acid) were predominantly resistant to ethionine and overproduced both threonine and methionine (2 mg/ml each). Novelty of the mutants is discussed

Review of Particle Physics

This biennial review summarizes much of Particle Physics. Using data from previous editions, plus 1900 new measurements from 700 papers, we list, evaluate, and average measured properties of gauge bosons, leptons, quarks, mesons, and baryons. We also summarize searches for hypothetical particles such as Higgs bosons, heavy neutrinos, and supersymmetric particles. All the particle properties and search limits are listed in Summary Tables. We also give numerous tables, figures, formulae, and reviews of topics such as the Standard Model, particle detectors, probability, and statistics. A booklet is available containing the Summary Tables and abbreviated versions of some of the other sections of this full Review. © 1996 The American Physical Society