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Search Results: 1 - 10 of 126 matches for " Christoffer Schander "
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Thyasira ockelmanni (Mollusca: Bivalvia: Veneroidea), A new species of Thyasiridae from the Norwegian Sea
Rozemarijn Keuning,Christoffer Schander
Fauna Norvegica , 2010, DOI: 10.5324/fn.v30i0.640
Osedax mucofloris (Polychaeta, Siboglinidae), a bone-eating marine worm new to Norway
Christoffer Schander,Hans Tore Rapp,Thomas G. Dahlgren
Fauna Norvegica , 2010, DOI: 10.5324/fn.v30i0.632
Devonia perrieri (Malard, 1903) (Bivalvia) found in situ on the holothurian Leptosynapta inhaerens (Müller, 1776) in Norway
Glenn A. Bristow,Per Johannessen,Bj?rn Berland,Christoffer Schander
Fauna Norvegica , 2010, DOI: 10.5324/fn.v30i0.668
Falcidens sagittiferus Salvini-Plawen, 1968: additional data on
Dimitry L. Ivanov,Nina T. Mikkelsen,Christoffer Schander
Fauna Norvegica , 2010, DOI: 10.5324/fn.v29i0.610
Abstract: Ivanov DL, Mikkelsen NT, Schander C. 2009. Falcidens sagittiferus Salvini-Plawen, 1968: additional data on morphology and distribution (Mollusca, Aplacophora, Caudofoveata). Fauna Norvegica vol 29: 3-9. Falcidens sagittiferus Salvini-Plawen, 1968 is a species of caudofoveate (Chaetodermomorpha) not uncommon in southern Scandinavia. Previous descriptions have however been based mainly on fixed material, and illustrations of sclerites and radula have been incomplete. We here present data from an investigation based on over 70 specimens from Norway (including the type material). Radula, sclerites and living specimens are illustrated.
Molecular Phylogeny of the Astrophorida (Porifera, Demospongiaep) Reveals an Unexpected High Level of Spicule Homoplasy
Paco Cárdenas,Joana R. Xavier,Julie Reveillaud,Christoffer Schander,Hans Tore Rapp
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0018318
Abstract: The Astrophorida (Porifera, Demospongiaep) is geographically and bathymetrically widely distributed. Systema Porifera currently includes five families in this order: Ancorinidae, Calthropellidae, Geodiidae, Pachastrellidae and Thrombidae. To date, molecular phylogenetic studies including Astrophorida species are scarce and offer limited sampling. Phylogenetic relationships within this order are therefore for the most part unknown and hypotheses based on morphology largely untested. Astrophorida taxa have very diverse spicule sets that make them a model of choice to investigate spicule evolution.
Feeding Ecology of Coryphaenoides rupestris from the Mid-Atlantic Ridge
Odd Aksel Bergstad,Guro Gjelsvik,Christoffer Schander,?ge S. H?ines
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010453
Abstract: The Macrourid fish roundnose grenadier, Coryphaenoides rupestris, is one of the most common benthopelagic fishes on the northern mid-Atlantic Ridge. The ecology of the species is comparatively well studied in continental slope waters of the North Atlantic, but not on the mid-Atlantic Ridge, which is a central mid-ocean area of its distribution. In total, 166 specimens from the RV G.O. Sars cruise in July 2004 were examined. The diet mainly comprised cephalopods, pelagic shrimps and fish. Pelagic and benthopelagic copepods were the most numerous prey, but did not contribute much on a weight basis. Cephalopods were by far the most important prey of the small grenadiers, while shrimps and fish became increasingly significant with increasing size. Previous studies from other areas have also found pelagic prey to be important, but in contrast to this study, cephalopods were generally of less importance. The study was an element of more wide-ranging food-web studies of the mid-Atlantic Ridge macro- and megafauna communities within the international MAR-ECO project.
Maike Rotzoll, Marion Hulverscheidt (Hrsg): Nie geschehen. Schreiben über die Pest. Texte aus einem medizinhistorischen Lehrexperiment [Maike Rotzoll, Marion Hulverscheidt (Hrsg): Nie geschehen. Schreiben über die Pest. Texte aus einem medizinhistorischen Lehrexperiment]
Krug, Christoffer
GMS Zeitschrift für Medizinische Ausbildung , 2012, DOI: 10.3205/zma000822
Correlations and Fluctuations in the Initial State of high energy Heavy Ion Collisions
Christoffer Flensburg
Physics , 2011,
Abstract: Initial states of high energy heavy ion collisions are studied using a dipole model through the DIPSY event generator that dynamically includes saturation together with the fluctuations and correlations of the BFKL cascade. The eccentricities of first up to fourth moment are calculated at RHIC and LHC. Predictions are made for correlations and fluctuations in rapidity of the eccentricities, and conventional theoretical approximations are tested. A large set of initial state Au-Au, Cu-Au and Pb-Pb collisions have been generated and are published online.
Multilepton and multiphoton signatures of supersymmetry at the LHC
Christoffer Petersson
Physics , 2014,
Abstract: Motivated by the absence of any clear signal of physics beyond the Standard Model at the LHC after Run I, we discuss one possible slight hint of new physics and one non-minimal extension of the Standard Model. In the first part we provide a tentative explanation of a small excess of multilepton events, observed by the CMS collaboration, by means of a simplified model of gauge mediated supersymmetry breaking. In the second part we discuss how the standard phenomenology of gauge mediation can be significantly modified if one makes the non-minimal assumption that supersymmetry is broken in more than one hidden sector. Such multiple hidden sector models involve light neutral fermions called pseudo-goldstini and, due to the extra decay steps they induce, where soft photons are emitted, these models give rise to multiphoton plus missing energy signatures. We discuss why the existing LHC searches are poorly sensitive to these model and we propose new searches designed to probe them.
Disappearing charged tracks in association with displaced leptons from supersymmetry
Christoffer Petersson
Physics , 2014,
Abstract: In this note we discuss a characteristic collider signature of models of gauge mediated supersymmetry breaking in which the selectron and smuon are mass-degenerate co-NLSP. In these models, all processes involving superpartners give rise to two NLSP selectrons or smuons, each of which subsequently decays to a nearly massless LSP gravitino and an electron or a muon. In a large region of the parameter space, the NLSPs travel macroscopic distances, of the order 0.1-1000 mm, before they decay. Hence, these models give rise to collider signatures involving charged tracks that end at vertices, which are inside the detector volume but displaced with respect to the original collision point, from which an electron or a muon is emitted. In order to probe this class of models we propose a search for disappearing charged tracks in association with displaced electrons or muons.
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