Latest documents http://publikationen.ub.uni-frankfurt.de/index/index/ Sun, 02 Jun 2013 15:29:35 +0100 Sun, 02 Jun 2013 15:29:35 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/28316 The project focuses on the efficiency of combined technologies to reduce the release of micropollutants and bacteria into surface waters via sewage treatment plants of different size and via stormwater overflow basins of different types. As a model river in a highly populated catchment area, the river Schussen and, as a control, the river Argen, two tributaries of Lake Constance, Southern Germany, are under investigation in this project. The efficiency of the different cleaning technologies is monitored by a wide range of exposure and effect analyses including chemical and microbiological techniques as well as effect studies ranging from molecules to communities. Rita Triebskorn; Klaus Amler; Ludek Blaha; Claudia Gallert; Sabrina Giebner; Hans Güde; Anja Henneberg; Stefanie Hess; Harald Hetzenauer; Klaus Jedele; Ralph-Michael Jung; Sven Kneipp; Heinz-R. Köhler; Stefanie Krais; Bertram Kuch; Claudia Lange; Herbert Löffler; Diana Maier; Jörg Metzger; Michael Müller; Jörg Oehlmann; Raphaela Osterauer; Katharina Peschke; Jürgen Raizner; Peter Rey; Magali Rault; Doreen Richter; Frank Sacher; Marco Scheurer; Jutta Schneider-Rapp; Merav Seifan; Markus Spieth; Hans-Joachim Vogel; Michael Weyhmüller; Josef Winter; Karl Wurm article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/28316 Wed, 06 Feb 2013 15:29:35 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27285 We report progress in our exploration of the finite-temperature phase structure of two-flavour lattice QCD with twisted-mass Wilson fermions and a tree-level Symanzik-improved gauge action for a temporal lattice size Nt = 8. Extending our investigations to a wider region of parameter space we gain a global view of the rich phase structure. We identify the finite temperature transition/ crossover for a non-vanishing twisted-mass parameter in the neighbourhood of the zerotemperature critical line at sufficiently high b . Our findings are consistent with Creutz’s conjecture of a conical shape of the finite temperature transition surface. Comparing with NLO lattice cPT we achieve an improved understanding of this shape. Ernst-Michael Ilgenfritz; Karl Jansen; Maria Paola Lombardo; Michael Müller-Preussker; Marcus Petschlies; Owe Philipsen; Lars Zeidlewicz conferenceobject http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27285 Mon, 17 Dec 2012 15:33:45 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27283 We discuss the use of Wilson fermions with twisted mass for simulations of QCD thermodynamics. As a prerequisite for a future analysis of the finite-temperature transition making use of automatic O(a) improvement, we investigate the phase structure in the space spanned by the hopping parameter k , the coupling b , and the twisted mass parameter m. We present results for Nf = 2 degenerate quarks on a 163×8 lattice, for which we investigate the possibility of an Aoki phase existing at strong coupling and vanishing m, as well as of a thermal phase transition at moderate gauge couplings and non-vanishing m. Ernst-Michael Ilgenfritz; Michael Müller-Preußker; Marcus Petschlies; Karl Jansen; Maria Paola Lombardo; Owe Philipsen; Lars Zeidlewicz; André Sternbeck conferenceobject http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27283 Mon, 17 Dec 2012 15:24:59 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27437 We present the current status of lattice simulations with Nf = 2 maximally twisted mass Wilson fermions at finite temperature. In particular, the determination of the thermal transition tempera- ture is discussed. Florian Burger; Malik Kirchner; Michael Müller-Preussker; Ernst-Michael Ilgenfritz; Maria Paola Lombardo; Owe Philipsen; Lars Zeidlewicz; Carsten Urbach conferenceobject http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27437 Fri, 14 Dec 2012 15:10:56 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27441 We report about the current status of our ongoing study of the chiral limit of two-flavor QCD at finite temperature with twisted mass quarks. We estimate the pseudo-critical temperature Tc for three values of the pion mass in the range of mPS ~ 300 and 500 MeV and discuss different chiral scenarios. Furthermore, we present first preliminary results for the trace anomaly, pressure and energy density. We have studied several discretizations of Euclidean time up to Nt = 12 in order to assess the continuum limit of the trace anomaly. From its interpolation we evaluate the pressure and energy density employing the integral method. Here, we have focussed on two pion masses with mPS ~ 400 and 700 MeV. Florian Burger; Malik Kirchner; Michael Müller-Preussker; Ernst-Michael Ilgenfritz; Maria-Paola Lombardo; Owe Philipsen; Christopher Pinke; Lars Zeidlewicz conferenceobject http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/27441 Fri, 14 Dec 2012 13:05:21 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/26383 Riboswitches reflect a novel concept in gene regulation that is particularly suited for technological adaptation. Therefore, we characterized thermodynamically the ligand binding properties of a synthetic, tetracycline (tc)-binding RNA aptamer, which regulates gene expression in a dose-dependent manner when inserted into the untranslated region of an mRNA. In vitro, one molecule of tc is bound by one molecule of partially pre-structured and conformationally homogeneous apo-RNA. The dissociation constant of 770 pM, as determined by fluorimetry, is the lowest reported so far for a small molecule-binding RNA aptamer. Additional calorimetric analysis of RNA point mutants and tc derivatives identifies functional groups crucial for the interaction and including their respective enthalpic and entropic contributions we can propose detailed structural and functional roles for certain groups. The conclusions are consistent with mutational analyses in vivo and support the hypothesis that tc-binding reinforces the structure of the RNA aptamer, preventing the scanning ribosome from melting it efficiently. Michael Müller; Julia E. Weigand; Oliver Weichenrieder; Beatrix Süß article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/26383 Thu, 20 Sep 2012 13:31:22 +0200