University of Ljubljana

About: University of Ljubljana is a education organization based out in Ljubljana, Slovenia. It is known for research contribution in the topics: Population & Liquid crystal. The organization has 17210 authors who have published 47013 publications receiving 1082684 citations. The organization is also known as: Univerza v Ljubljani.

Measurement of hard double-parton interactions in W(-> lv) plus 2-jet events at root s=7 TeV with the ATLAS detector

Abstract: The production of W bosons in association with two jets in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36 pb(-1), collected with the ATLAS detector at the Large Hadron Collider. The fraction of events arising from double-parton interactions, f(DP)((D)), has been measured through the p(T) balance between the two jets and amounts to f(DP)((D)) = 0.08 +/- 0.01 (stat.) +/- 0.02 (sys.) for jets with transverse momentum p(T) > 20 GeV and rapidity vertical bar y vertical bar < 2.8. This corresponds to a measurement of the effective area parameter for hard double-parton interactions of sigma(eff) = 15 +/- 3 (stat.)(-3)(+5) (sys.) mb.

Taxonomy and phylogeny of the xerophilic genus Wallemia (Wallemiomycetes and Wallemiales, cl. et ord. nov.)

Abstract: The genus Wallemia comprises xerophilic species. Based on parenthesome ultrastructure it has been linked to the Filobasidiales (basidiomycetes). Species show a unique type of conidiogenesis, including basauxic development of fertile hyphae, segregation of conidial units more or less basipetally, and disarticulation of conidial units into mostly four arthrospore-like conidia. Wallemia is known from air, soil, dried food (causing spoilage), and salt. It can be isolated from hypersaline water of man-made salterns on different continents. Based on analyses of the nuclear small subunit ribosomal DNA (SSU rDNA) Wallemia has been placed into a highly supported clade together with Ustilaginomycetes and Hymenomycetes (Basidiomycota). Within this clade, it possesses an isolated position distantly related to the Filobasidiales and was characterized by numerous nucleotide substitutions not shared by any other fungus. Tests on xerotolerance indicated that Wallemia presents one of the most xerophilic fungal taxa. Xerotolerance is otherwise rare in the Basidiomycota. To acknowledge its unique morphology, evolution, and xerotolerance, a new basidiomycetous class Wallemiomycetes covering an order Wallemiales, is proposed. Based on differences in conidial size, xerotolerance, and sequence data of the rDNA internal transcribed spacer regions (ITS rDNA), at least three Wallemia species are segregated, identified as Wallemia ichthyophaga, Wallemia sebi, and Torula epizoa var. muriae, for which the combination Wallemia muriae is proposed. The three species are neotypified. Wallemia ichthyophaga differs from W. sebi and W. muriae in numerous nucleotides of the SSU and ITS rDNA. This high variation within Wallemia indicates existence of at least two cryptic genera not distinguishable by morphological characters.