Trends in radiation protection use and radiation exposure of European endourologists: an ESUT-YAU Endourology Group prospective trial

We have carried a theoretical study of the K^- p to M B gamma reaction with M B = K^-p, bar{K}^0 n, pi^- Sigma^+, pi^+ Sigma^-, pi^0 Sigma^0, pi^0 Lambda, for K^- lab. momenta between 200 and 500 MeV/c, using a chiral unitary approach for the strong K^-p interaction with its coupled channels. The Lambda(1405) resonance, which is generated dynamically in this approach, shows up clearly in the d sigma/dM_I spectrum, providing new tests for chiral symmetry and the unitary approach, as well as information regarding the nature of the resonance. The photon detection alone, summing all channels, is shown to reproduce quite accurately the strength and shape of the Lambda(1405) resonance. Analogous reactions in nuclei can provide much information on the properties of this resonance in a nuclear medium

Concise Total Synthesis and Stereochemical Revision of (+)-Naseseazines A and B: Regioselective Arylative Dimerization of Diketopiperazine Alkaloids

Concise and enantioselective total syntheses of (+)-naseseazines A and B are described. Our regioselective and directed dimerization of diketopiperazines provides their critical C3–C[2 over sp] linkages, an assembly with plausible biogenetic relevance. We revise the absolute stereochemistry of (+)-naseseazines A and B.National Institute of General Medical Sciences (U.S.) (GM089732)Amgen Inc.DuPont (Firm)American Society for Engineering Education. National Defense Science and Engineering Graduate Fellowshi