Three female specimens of C. rigidum were found in zooplankton samples from the Kouchibouguac and East River Estuaries in the southern Gulf of St. Lawrence, representing a new record for the ...northwest Atlantic. The geographic distribution of other monstrilloids in the northwest Atlantic and Arctic are also summarized. Variations in morphological characters were found between C. rigidum females found in the latter estuaries and those of C. rigidum Thompson, 1888 and are discussed herein. /// Trois spécimens femelles du monstrilloide C. rigidum ont été trouvés dans des échantillons de zooplancton collectés dans les estuaires des rivières Kouchibouguac et East, situées dans le sud du Golfe St. Laurent. La présence de ces femelles dans ces estuaires représente un nouveau signalement pour le nord-ouest de l'Atlantique. Un sommaire de la répartition géographique des monstrilloides dans le nord-ouest de l'Atlantique et l'Arctique est présenté. Les différences morphologiques entre les spécimens femelles de C. rigidum retrouvés dans ces estuaires et le spécimen-type femelle de C. rigidum Thompson, 1888 y sont discutées.
The production of neutral pions in 158AGeV Pb+Pb collisions has been studied in the WA98 experiment at the CERN SPS. Transverse momentum spectra are studied for the range 0.3 GeV/c mT-m0 4.0 GeV/c. ...The results for central collisions are compared to various models. The centrality dependence of the neutral pion spectral shape and yield is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with greater than about 30 participating nucleons which is most naturally explained by assuming an equilibrated system.
Results on the study of localized fluctuations in the multiplicity of charged particles and photons produced in 158A GeV/c Pb+Pb collisions are presented for varying centralities. The charged versus ...neutral particle multiplicity correlations in common phase space regions of varying azimuthal sizes are analyzed by two different methods. Various types of mixed events are constructed to probe fluctuations arising from different sources. The measured results are compared to those from simulations and from mixed events. The comparison indicates the presence of nonstatistical fluctuations in both the charged particle and photon multiplicities in limited azimuthal regions. However, no correlated charged-neutral fluctuations, a possible signature of formation of disoriented chiral condensates, are observed. An upper limit on the production of disoriented chiral condensates is set.
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