Medium induced QCD cascades : broadening and rescattering during branching

We study evolution equations describing jet propagation through quark-gluon plasma (QGP). In particular we investigate the contribution of momentum transfer during branching and find that such a contribution is sizeable. Furthermore, we study various approximations, such as the Gaussian approximation and the diffusive approximation to the jet-broadening term. We notice that in order to reproduce the BDIM equation (without the momentum transfer in the branching) the diffusive approximation requires a very large value of the jet-quenching parameter q

Medium induced QCD cascades: broadening, entropy and rescattering during branching

We study evolution equations describing jet propagation through quark--gluon plasma (QGP). In particular we investigate the contribution of momentum transfer during branching and find that such a contribution is sizeable. Furthermore, we study various approximations, such as the Gaussian approximation and the diffusive approximation to the jet-broadening term. We notice that in order to reproduce the BDIM equation (without the momentum transfer in the branching) the diffusive approximation requires a very large value of the jet-quenching parameter $\hat q$. We also quantify the solutions by calculating time dependence of entropy associated with each of the distributions.Comment: 21 page

Impairing the production of ribosomal RNA activates mammalian target of rapamycin complex 1 signalling and downstream translation factors

Ribosome biogenesis is a key process for maintaining protein synthetic capacity in dividing or growing cells, and requires coordinated production of ribosomal proteins and ribosomal RNA (rRNA), including the processing of the latter. Signalling through mammalian target of rapamycin complex 1 (mTORC1) activates all these processes. Here, we show that, in human cells, impaired rRNA processing, caused by expressing an interfering mutant of BOP1 or by knocking down components of the PeBoW complex elicits activation of mTORC1 signalling. This leads to enhanced phosphorylation of its substrates S6K1 and 4E-BP1, and stimulation of proteins involved in translation initiation and elongation. In particular, we observe both inactivation and downregulation of the eukaryotic elongation factor 2 kinase, which normally inhibits translation elongation. The latter effect involves decreased expression of the eEF2K mRNA. The mRNAs for ribosomal proteins, whose translation is positively regulated by mTORC1 signalling, also remain associated with ribosomes. Therefore, our data demonstrate that disrupting rRNA production activates mTORC1 signalling to enhance the efficiency of the translational machinery, likely to help compensate for impaired ribosome production

A Protein Inventory of Human Ribosome Biogenesis Reveals an Essential Function of Exportin 5 in 60S Subunit Export

A systematic search for human ribosome biogenesis factors shows conservation of many aspects of eukaryotic ribosome synthesis with the well-studied process in yeast and identifies an export route of 60S subunits that is specific for higher eukaryotes

Experiences with user training at Vienna University Library

The principal aim of this article is to give detailed information about the latest developments in the field of user training at Vienna University Library. The training concept is presented together with the practical management as well as influences involving changes and redesign like target agreements and in-house-training.Der vorliegende Artikel gibt einen detaillierten Einblick in die Entwicklungen im Bereich BenutzerInnenschulung an der Universitätsbibliothek Wien. Einer inhaltlichen Vorstellung des Schulungskonzepts folgt die Beschreibung der praktischen Handhabung sowie der Einflüsse, die zu Änderungen und Neugestaltungen des Gesamtkonzepts führen, wie Zielvereinbarungen und die interne Fortbildung

The cooperations of teaching librarians at Vienna University Library

The cooperation of university libraries with intra- and extra-university institutions with the goal of teaching information literacy has increased significantly in recent years. The topic of information literacy and the accurate handling of information have become a key skill in many areas, in society, in the economy, in education as well as in further training. Therefore, libraries are increasingly becoming educational institutions within the universities, colleges, schools and other institutions to which they belong.Vienna university library participates in this development and offers assistance for the accurate handling of information as the basis of writing academic or pre-academic papers in a variety of collaborations. These include courses at university as well as school levels which are tailored to the target groups. Some of these collaborations are discussed in detail: the training of PhD students and writing mentors in individual study courses, the support for pre-scientific work in schools and the training of school librarians.Kooperationen von Universitätsbibliotheken mit inner- und außeruniversitären Einrichtungen mit dem Ziel der Vermittlung von Informationskompetenz nehmen in den letzten Jahren signifikant zu. Das Thema Informationskompetenz und der richtige Umgang mit Information sind Schlüsselqualifikation in vielen Bereichen, in Gesellschaft, Wirtschaft sowie in der Aus- und Weiterbildung geworden. Daher werden Bibliotheken immer mehr zur Bildungseinrichtung für die eigenen Universitäten, Fachhochschulen, Schulen und sonstigen Einrichtungen. Auch die Universitätsbibliothek Wien beteiligt sich an dieser Entwicklung und bietet in verschiedensten Kooperationen Hilfestellung für den richtigen Umgang mit Information als Basis des Verfassens wissenschaftlicher Arbeiten. Dazu gehören Kurse im Rahmen der universitären und schulischen Ausbildung, maßgeschneidert für die jeweilige Zielgruppe. Einige dieser Kooperationen sollen im Folgenden besprochen werden: in der Ausbildung von DoktorandInnen und SchreibmentorInnen, in einzelnen Studiengängen, für die vorwissenschaftliche Arbeit (VWA) in Schulen und die Weiterbildung von SchulbibliothekarInnen

Time and spectrally resolved enhanced fluorescence using silver nanoparticle impregnated polycarbonate substrates

Silver nanoparticle impregnated polycarbonate strips have been investigated as substrates for metal-enhanced photoluminescence of a blue emitting dye molecule (coumarin 102). By considering simultaneous time and spectrally resolved photoluminescence we observed fluorescence enhancement resulting from plasmon coupling with an increase in the emission by a factor of ~8.5 with an associated reduction in the photon lifetime. We relate the fast and slow components of the observed emission decay to the presence of both monomers and aggregates in the films and we discuss their different responses to the plasmon coupling