Universitätspublikationen
783 search hits
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Forschung Frankfurt : das Wissenschaftsmagazin. 2005, Nr. 3
(2005)
- Schwerpunktthema: Laien: Umgang mit Wissen
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Forschung Frankfurt : das Wissenschaftsmagazin. 2005, Nr. 4
(2005)
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Capital markets in the long term : demography, economic development and funded pension systems
(2005)
- The focus of the discussion at the conference on September 23, 2004 was on the long-term impact on capital markets and pension systems. The speakers tried to identify the direction and magnitude of potential changes as well as the likelihood of an eventual asset meltdown. The conference's objective was to combine insights from academia with those from the financial community in order to provide a more comprehensive outlook on capital market developments. Conference Reader Nr. 2005/01
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Simulation of denitrification and ozone loss for the Arctic winter 2002/2003
(2005)
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Jens-Uwe Grooß
Gebhard Günther
Rolf Müller
Paul Konopka
Stephan Bausch
Hans Schlager
Christiane Voigt
C.-Michael Volk
Geoffrey C. Toon
- We present simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) for the Arctic winter 2002/2003. We integrated a Lagrangian denitrification scheme into the three-dimensional version of CLaMS that calculates the growth and sedimentation of nitric acid trihydrate (NAT) particles along individual particle trajectories. From those, we derive the HNO3 downward flux resulting from different particle nucleation assumptions. The simulation results show a clear vertical redistribution of total inorganic nitrogen ( ), with a maximum vortex average permanent removal of over 5ppb in late December between 500 and 550K and a corresponding increase of of over 2ppb below about 450K. The simulated vertical redistribution of is compared with balloon observations by MkIV and in-situ observations from the high altitude aircraft Geophysica. Assuming a globally uniform NAT particle nucleation rate of 7.8x10-6cm-3h-1 in the model, the observed denitrification is well reproduced.
In the investigated winter 2002/2003, the denitrification has only moderate impact (≤14%) on the simulated vortex average ozone loss of about 1.1ppm near the 460K level. At higher altitudes, above 600K potential temperature, the simulations show significant ozone depletion through -catalytic cycles due to the unusual early exposure of vortex air to sunlight.
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Bericht 2005 / Institut für Sozial-Ökologische Forschung (ISOE)
(2005)
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Prediction of beta-barrel membrane proteins by searching for restricted domains
(2005)
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Oliver Mirus
Enrico Schleiff
- BACKGROUND:
The identification of beta-barrel membrane proteins out of a genomic/proteomic background is one of the rapidly developing fields in bioinformatics. Our main goal is the prediction of such proteins in genome/proteome wide analyses.
RESULTS:
For the prediction of beta-barrel membrane proteins within prokaryotic proteomes a set of parameters was developed. We have focused on a procedure with a low false positive rate beside a procedure with lowest false prediction rate to obtain a high certainty for the predicted sequences. We demonstrate that the discrimination between beta-barrel membrane proteins and other proteins is improved by analyzing a length limited region. The developed set of parameters is applied to the proteome of E. coli and the results are compared to four other described procedures.
CONCLUSION:
Analyzing the beta-barrel membrane proteins revealed the presence of a defined membrane inserted beta-barrel region. This information can now be used to refine other prediction programs as well. So far, all tested programs fail to predict outer membrane proteins in the proteome of the prokaryote E. coli with high reliability. However, the reliability of the prediction is improved significantly by a combinatory approach of several programs. The consequences and usability of the developed scores are discussed.
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Deciding the FIFO stability of networks in polynomial time
(2005)
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Maik Weinard
- FIFO is the most prominent queueing strategy due to its simplicity and the fact that it only works with local information. Its analysis within the adversarial queueing theory however has shown, that there are networks that are not stable under the FIFO protocol, even at arbitrarily low rate. On the other hand there are networks that are universally stable, i.e., they are stable under every greedy protocol at any rate r < 1. The question as to which networks are stable under the FIFO protocol arises naturally. We offer the first polynomial time algorithm for deciding FIFO stability and simple-path FIFO stability of a directed network, answering an open question posed in [1, 4]. It turns out, that there are networks, that are FIFO stable but not universally stable, hence FIFO is not a worst case protocol in this sense. Our characterization of FIFO stability is constructive and disproves an open characterization in [4].
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FAUST - das neue Internetportal des Fachbereichs Medizin der J.W. Goethe-Universität Frankfurt am Main
(2005)
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Richard Jack Melamed
Helmut Wicht
Frank Nürnberger
Gertrud Klauer
- Die medizinische Ausbildung wird gegenwärtig zunehmend mit E-Learning-Elementen angereichert. Die Orientierung in der in verschiedenste Netze zersplitterten Lernlandschaft erweist sich häufig als problematisch und zeitaufwändig, und dies bereits innerhalb einzelner Universitäten und Fachbereiche. "FAUST" - Frankfurter Ausbildungs - und Studienangebote der Medizin im virtuellen Raum (http://www.med.uni-frankfurt.de/faust/index.html) - löst dieses Problem. FAUST bietet einfache und schnelle Zugangsmöglichkeiten zu allen instituts- und klinikeigenen elektronischen Informationsquellen (z. B. Vorlesungsskripte) und E-learning Projekten (e!uro; fanatomic.de; HistoPathOnline, E-learning-Academy) sowie zu überregionalen medizinischen Lernplattformen (z. B. k-med, LaMedica), die in Frankfurt entwickelt bzw. mitentwickelt wurden und bereits curricular eingesetzt werden. Schneller Zugang wird auch zum Lernmanagementsystem WebCT vermittelt, das zunehmend zur Kommunikation, strukturierten Präsentation von E-Content sowie zur Durchführung elektronischer Klausuren eingesetzt wird. Das Portal wurde von einem im E-Learning erfahrenen Team (Kliniker, Vorkliniker, Designer, Informatiker) mit Mitteln des Lehr- und Studienausschusses entwickelt. Es ist seit dem Sommersemester 2005 freigeschaltet. FAUST versteht sich zudem als Anlaufstelle für Lehrende des Fachbereichs Medizin, die am E-Learning interessiert sind. Sie können Beratung bei didaktischen und technischen Fragen, sowie Unterstützung bei der Realisierung ihrer Projekte erhalten. FAUST möchte auf diesem Wege die Vernetzung der E-Learning-Akteure unterstützen.
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Fünf Jahre "Neue Frankfurter Studienordnung" : beeinflusst das Curriculum den Studienerfolg?
(2005)
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Ursula Kersken-Nülens
Frank Seibert-Alves
Frank Nürnberger
- Kurzfassung eines Vortrags gehalten auf der GMA-Tagung vom 04.11.-06.11.2005 in Münster. Aufgrund wenig überzeugender Leistungen seiner Studierenden im vorklinischen Studienabschnitt hat der Fachbereich Medizin der Goethe-Universität zum Wintersemester 2001/02 eine völlig neue Studienordnung eingeführt, deren wesentliche Ziele das erfolgreiche Erlernen natur-, geistes- und sozialwissenschaftlicher Komponenten der normalen Biologie des Menschen mit optimaler Vorbereitung auf den klinischen Studienabschnitt binnen zweier Studienjahre und die Kompatibilität mit der ÄAppO und der ZÄAppO (jeweils alte und neue Version bzw. Vorentwurf) sind. Grundprinzipien des Curriculums sind: 1. Logisch aufeinander abgestimmte Themenblöcke, 2. Integration von makroskopischer und mikroskopischer Anatomie, 3. Interdisziplinärität der Themenblöcke, 4. Immanente Wiederholung von Lehrinhalten durch enge Verzahnung von Plenar- und Kleingruppenveranstaltungen, 5. Aufteilung der Studienanfänger in gemischte Gruppen nach den Kriterien Geschlecht, Herkunft und Studienfach, 6. Erlernen des Umgangs mit Patienten schon vom ersten Semester an durch "Anatomie am Lebenden"-Kurse und durch den Kurs Einführung in die klinische Medizin. Wichtigste Ergebnisse: Steigerung der Referenzgruppe beim Physikum von ca. 25% auf >60%, relativ guter Prüfungserfolg, hervorragende Sozialisation durch die frühe randomisierte Zuordnung in Kleingruppen und der sehr glatte Übergang in den klinischen Abschnitt des Medizin- bzw. Zahnmedizinstudiums.
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Opisthobranchia (Mollusca, Gastropoda) – more than just slimy slugs. Shell reduction and its implications on defence and foraging
(2005)
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Heike Wägele
Annette Klussmann-Kolb
- Background: In general shell-less slugs are considered to be slimy animals with a rather dull appearance and a pest to garden plants. But marine slugs usually are beautifully coloured animals belonging to the less-known Opisthobranchia. They are characterized by a large array of interesting biological phenomena, usually related to foraging and/or defence. In this paper our knowledge of shell reduction, correlated with the evolution of different defensive and foraging strategies is reviewed, and new results on histology of different glandular systems are included. Results: Based on a phylogeny obtained by morphological and histological data, the parallel reduction of the shell within the different groups is outlined. Major food sources are given and glandular structures are described as possible defensive structures in the external epithelia, and as internal glands. Conclusion: According to phylogenetic analyses, the reduction of the shell correlates with the evolution of defensive strategies. Many different kinds of defence structures, like cleptocnides, mantle dermal formations (MDFs), and acid glands, are only present in shell-less slugs. In several cases, it is not clear whether the defensive devices were a prerequisite for the reduction of the shell, or reduction occurred before. Reduction of the shell and acquisition of different defensive structures had an implication on exploration of new food sources and therefore likely enhanced adaptive radiation of several groups. © 2005 Wägele and Klussmann-Kolb; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited: http://www.frontiersinzoology.com/content/2/1/3/
