@article{BaumannLucas2013, author = {Baumann, Annette and Lucas, Reeh}, title = {Folgende Module k{\"o}nnten Sie auch interessieren?}, series = {E-Learning Symposium 2012 : Aktuelle Anwendungen, innovative Prozesse und neueste Ergebnisse aus der E-Learning-Praxis ; Potsdam, 17. November 2012}, journal = {E-Learning Symposium 2012 : Aktuelle Anwendungen, innovative Prozesse und neueste Ergebnisse aus der E-Learning-Praxis ; Potsdam, 17. November 2012}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, doi = {10.25932/publishup-44215}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-442157}, pages = {67 -- 68}, year = {2013}, abstract = {Im Hochschulalltag begegnen sich Dozenten und Studenten als zwei Gruppen mit entgegengesetzten Rollen, z.B. als Lehrende und Lernende, als Forscher und studentische Hilfskr{\"a}fte. Die Ber{\"u}hrungspunkte beider Gruppen er{\"o}ffnen neue Chancen im Student Life Cycle f{\"u}r zielgerichtete Kooperationen - von der Studierende f{\"u}r Entscheidungsprozesse im Fortgang ihres Studiums und Dozenten f{\"u}r die Gewinnung von Masterstudenten und Doktoranden profitieren k{\"o}nnen. Kein E-Learning im klassischen Sinn, aber eine praktische Anwendung von Empfehlungstechniken auf Basis eines Campus Management Systems werden Posterbeitrag und Live-Demo vorstellen, mit der zur Zeit verschiedene Zielrichtungen f{\"u}r die Empfehlung von Wahlmodulen und eine kohorten-basierte Informationsaufbereitung im Curricula Support experimentell untersucht werden.}, language = {de} } @article{BaumannBauer2013, author = {Baumann, Otto and Bauer, Alexandra}, title = {Development of apical membrane organization and V-ATPase regulation in blowfly salivary glands}, series = {The journal of experimental biology}, volume = {216}, journal = {The journal of experimental biology}, number = {7}, publisher = {Company of Biologists Limited}, address = {Cambridge}, issn = {0022-0949}, doi = {10.1242/jeb.077420}, pages = {1225 -- 1234}, year = {2013}, abstract = {Secretory cells in blowfly salivary gland are specialized via morphological and physiological attributes in order to serve their main function, i.e. the transport of solutes at a high rate in response to a hormonal stimulus, namely serotonin (5-HT). This study examines the way that 5-HT-insensitive precursor cells differentiate into morphologically complex 5-HT-responsive secretory cells. By means of immunofluorescence microscopy, immunoblotting and measurements of the transepithelial potential changes, we show the following. (1) The apical membrane of the secretory cells becomes organized into an elaborate system of canaliculi and is folded into pleats during the last pupal day and the first day of adulthood. (2) The structural reorganization of the apical membrane is accompanied by an enrichment of actin filaments and phosphorylated ERM protein (phospho-moesin) at this membrane domain and by the deployment of the membrane-integral part of vacuolar-type H+-ATPase (V-ATPase). These findings suggest a role for phospho-moesin, a linker between actin filaments and membrane components, in apical membrane morphogenesis. (3) The assembly and activation of V-ATPase can be induced immediately after eclosion by way of 8-CPT-cAMP, a membrane-permeant cAMP analogue. (4) 5-HT, however, produces the assembly and activation of V-ATPase only in flies aged for at least 2 h after eclosion, indicating that, at eclosion, the 5-HT receptor/adenylyl cyclase/cAMP signalling pathway is inoperative upstream of cAMP. (5) 5-HT activates both the Ca2+ signalling pathway and the cAMP signalling cascade in fully differentiated secretory cells. However, the functionality of these signalling cascades does not seem to be established in a tightly coordinated manner during cell differentation.}, language = {en} } @article{BaumannArndtMueller2013, author = {Baumann, Tobias and Arndt, Katja Maren and M{\"u}ller, Kristian M.}, title = {Directional cloning of DNA fragments using deoxyinosine-containing oligonucleotides and endonuclease V}, series = {BMC biotechnology}, volume = {13}, journal = {BMC biotechnology}, number = {10}, publisher = {BioMed Central}, address = {London}, issn = {1472-6750}, doi = {10.1186/1472-6750-13-81}, pages = {11}, year = {2013}, abstract = {Background: DNA fragments carrying internal recognition sites for the restriction endonucleases intended for cloning into a target plasmid pose a challenge for conventional cloning. Results: A method for directional insertion of DNA fragments into plasmid vectors has been developed. The target sequence is amplified from a template DNA sample by PCR using two oligonucleotides each containing a single deoxyinosine base at the third position from the 5' end. Treatment of such PCR products with endonuclease V generates 3' protruding ends suitable for ligation with vector fragments created by conventional restriction endonuclease reactions. Conclusions: The developed approach generates terminal cohesive ends without the use of Type II restriction endonucleases, and is thus independent from the DNA sequence. Due to PCR amplification, minimal amounts of template DNA are required. Using the robust Taq enzyme or a proofreading Pfu DNA polymerase mutant, the method is applicable to a broad range of insert sequences. Appropriate primer design enables direct incorporation of terminal DNA sequence modifications such as tag addition, insertions, deletions and mutations into the cloning strategy. Further, the restriction sites of the target plasmid can be either retained or removed.}, language = {en} } @article{Baushev2013, author = {Baushev, Anton N.}, title = {Extragalactic dark matter and direct detection experiments}, series = {The astrophysical journal : an international review of spectroscopy and astronomical physics}, volume = {771}, journal = {The astrophysical journal : an international review of spectroscopy and astronomical physics}, number = {2}, publisher = {IOP Publ. Ltd.}, address = {Bristol}, issn = {0004-637X}, doi = {10.1088/0004-637X/771/2/117}, pages = {7}, year = {2013}, abstract = {Recent astronomical data strongly suggest that a significant part of the dark matter content of the Local Group and Virgo Supercluster is not incorporated into the galaxy halos and forms diffuse components of these galaxy clusters. A portion of the particles from these components may penetrate the Milky Way and make an extragalactic contribution to the total dark matter containment of our Galaxy. We find that the particles of the diffuse component of the Local Group are apt to contribute similar to 12\% to the total dark matter density near Earth. The particles of the extragalactic dark matter stand out because of their high speed (similar to 600 km s(-1)), i.e., they are much faster than the galactic dark matter. In addition, their speed distribution is very narrow (similar to 20 km s(-1)). The particles have an isotropic velocity distribution (perhaps, in contrast to the galactic dark matter). The extragalactic dark matter should provide a significant contribution to the direct detection signal. If the detector is sensitive only to the fast particles (v > 450 km s(-1)), then the signal may even dominate. The density of other possible types of the extragalactic dark matter (for instance, of the diffuse component of the Virgo Supercluster) should be relatively small and comparable with the average dark matter density of the universe. However, these particles can generate anomaly high-energy collisions in direct dark matter detectors.}, language = {en} } @article{BechtoldHogendoornKohutovaetal.2013, author = {Bechtold, Sander and Hogendoorn, Thirza and Koh{\´u}tov{\´a}, Vivien and Potočanov{\´a}, Katar{\´i}na}, title = {Deepening understanding}, series = {Potsdamer geographische Praxis}, journal = {Potsdamer geographische Praxis}, number = {3}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {2194-1599}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-66011}, pages = {105 -- 110}, year = {2013}, abstract = {1. Key concepts 2. What students should have done 3. What students did 4. Deepening understanding 5. General description of deepening understanding 6. Why is deepening understanding an important stage? 7. How does deepening understanding occur in the lessons and some examples 8. Possible difficulties 9. Conclusion}, language = {en} } @article{Beck2013, author = {Beck, Hanno}, title = {Das literarische Testament Alexander von Humboldts 1799}, series = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, volume = {XIV}, journal = {HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies}, number = {27}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-5239}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-70126}, pages = {87 -- 95}, year = {2013}, language = {de} } @article{BeckHollowaySchwanghart2013, author = {Beck, Jan and Holloway, Jeremy D. and Schwanghart, Wolfgang}, title = {Undersampling and the measurement of beta diversity}, series = {Methods in ecology and evolution : an official journal of the British Ecological Society}, volume = {4}, journal = {Methods in ecology and evolution : an official journal of the British Ecological Society}, number = {4}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {2041-210X}, doi = {10.1111/2041-210x.12023}, pages = {370 -- 382}, year = {2013}, abstract = {Beta diversity is a conceptual link between diversity at local and regional scales. Various additional methodologies of quantifying this and related phenomena have been applied. Among them, measures of pairwise (dis)similarity of sites are particularly popular. Undersampling, i.e. not recording all taxa present at a site, is a common situation in ecological data. Bias in many metrics related to beta diversity must be expected, but only few studies have explicitly investigated the properties of various measures under undersampling conditions. On the basis of an empirical data set, representing near-complete local inventories of the Lepidoptera from an isolated Pacific island, as well as simulated communities with varying properties, we mimicked different levels of undersampling. We used 14 different approaches to quantify beta diversity, among them dataset-wide multiplicative partitioning (i.e. true beta diversity') and pairwise site x site dissimilarities. We compared their values from incomplete samples to true results from the full data. We used these comparisons to quantify undersampling bias and we calculated correlations of the dissimilarity measures of undersampled data with complete data of sites. Almost all tested metrics showed bias and low correlations under moderate to severe undersampling conditions (as well as deteriorating precision, i.e. large chance effects on results). Measures that used only species incidence were very sensitive to undersampling, while abundance-based metrics with high dependency on the distribution of the most common taxa were particularly robust. Simulated data showed sensitivity of results to the abundance distribution, confirming that data sets of high evenness and/or the application of metrics that are strongly affected by rare species are particularly sensitive to undersampling. The class of beta measure to be used should depend on the research question being asked as different metrics can lead to quite different conclusions even without undersampling effects. For each class of metric, there is a trade-off between robustness to undersampling and sensitivity to rare species. In consequence, using incidence-based metrics carries a particular risk of false conclusions when undersampled data are involved. Developing bias corrections for such metrics would be desirable.}, language = {en} } @article{BellettiniLonatiMalchiodietal.2013, author = {Bellettini, Carlo and Lonati, Violetta and Malchiodi, Dario and Monga, Mattia and Morpurgo, Anna and Torelli, Mauro}, title = {What you see is what you have in mind}, series = {Commentarii informaticae didacticae : (CID)}, journal = {Commentarii informaticae didacticae : (CID)}, number = {6}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1868-0844}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-64612}, pages = {139 -- 147}, year = {2013}, abstract = {In this paper we report on our experiments in teaching computer science concepts with a mix of tangible and abstract object manipulations. The goal we set ourselves was to let pupils discover the challenges one has to meet to automatically manipulate formatted text. We worked with a group of 25 secondary school pupils (9-10th grade), and they were actually able to "invent" the concept of mark-up language. From this experiment we distilled a set of activities which will be replicated in other classes (6th grade) under the guidance of maths teachers.}, language = {en} } @article{BenAbdallahMessinaBiehsetal.2013, author = {Ben-Abdallah, Philippe and Messina, Riccardo and Biehs, Svend-Age and Tschikin, Maria and Joulain, Karl and Henkel, Carsten}, title = {Heat superdiffusion in plasmonic nanostructure networks}, series = {Physical review letters}, volume = {111}, journal = {Physical review letters}, number = {17}, publisher = {American Physical Society}, address = {College Park}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.111.174301}, pages = {5}, year = {2013}, abstract = {The heat transport mediated by near-field interactions in networks of plasmonic nanostructures is shown to be analogous to a generalized random walk process. The existence of superdiffusive regimes is demonstrated both in linear ordered chains and in three-dimensional random networks by analyzing the asymptotic behavior of the corresponding probability distribution function. We show that the spread of heat in these networks is described by a type of Levy flight. The presence of such anomalous heat-transport regimes in plasmonic networks opens the way to the design of a new generation of composite materials able to transport heat faster than the normal diffusion process in solids.}, language = {en} } @article{Benacka2013, author = {Benacka, Jan}, title = {BubbleSort, SelectSort and InsertSort in Excel \& Delphi}, series = {Commentarii informaticae didacticae : (CID)}, journal = {Commentarii informaticae didacticae : (CID)}, number = {6}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1868-0844}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-64636}, pages = {153 -- 154}, year = {2013}, abstract = {A method is presented of acquiring the principles of three sorting algorithms through developing interactive applications in Excel.}, language = {en} }