The production of nucleon resonances in proton-proton collisions at high energy and large momentum transfers

info:eu-repo/semantics/publishe

High-energy particle spectra from proton interactions at 19.2 GeV/c

CERN 70/12info:eu-repo/semantics/publishe

Differential cross sections for the reactions p + p → D + π+ and p + p → D + ρ{variant}+ at 21 GeV/c

Results are presented from an experiment in which high-energy deuterons, produced by proton-proton interactions at 21.1 GeV/c incident momentum, were detected over a range of angles from 12.5 mrad to 60 mrad in the laboratory system. From the momentum spectra of the deuterons, the final states D + π+ and D + ρ{variant}+ have been identified. The angular distribution for these reactions are presented and compared with previous data at lower energies. © 1969.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Negative particle production at the 70 GeV IHEP accelerator

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Production of negative particles by protons with energy up to 70 BeV

info:eu-repo/semantics/publishe

Priority areas of intraspecific diversity: Larzac, a global hotspot for facultative paedomorphosis in amphibians

Although the designation of biodiversity hotspots is a valuable tool to improve conservation efforts, this is a concept primarily based on species diversity. In consequence, another component of biodiversity, adaptive variation, is often ignored in conservation and to my knowledge no attempt has been made to identify hotspots of remarkable intraspecific patterns. My aim was to focus on the process of facultative paedomorphosis (i.e. the retention of larval traits such as gills in adult variants), a rare developmental pathway. One hundred and seventy-four ponds were inventoried in Larzac (France) to determine the distribution and abundance of paedomorphic palmate newts Triturus helveticus (Amphibia, Caudata) and to compare these results with the current distribution of paedomorphs in this and other species. During this study, paedomorphic newts were found in 46 ponds, 32 of which were described here for the first time. Seventy-nine per cent of known paedomorphic populations of this species were found there, whereas this area covers only 0.5% of the distribution area of the species. This represents the highest known density of facultatively paedomorphic populations, all species being considered. Because these populations face a high threat of disappearance, Larzac should be designated as an intraspecific biodiversity hotspot in order to protect adaptive intraspecific variation. Future conservation-oriented work should focus not only on species distributions but also on phenotypically diverse but spatially localized variation