placeholder
and
and

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Language
Year
  • 1
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 01 November 2016, Vol.113(44), pp.12467-12472
    Description: Horizontal gene transfer can speed up adaptive evolution and support chromosomal DNA repair. A particularly widespread mechanism of gene transfer is transformation. The initial step to transformation, namely the uptake of DNA from the environment, is supported by the type IV pilus system in most species. However, the molecular mechanism of DNA uptake remains elusive. Here, we used single-molecule techniques for characterizing the force-dependent velocity of DNA uptake by Neisseria gonorrhoeae We found that the DNA uptake velocity depends on the concentration of the periplasmic DNA-binding protein ComE, indicating that ComE is directly involved in the uptake process. The velocity-force relation of DNA uptake is in very good agreement with a translocation ratchet model where binding of chaperones in the periplasm biases DNA diffusion through a membrane pore in the direction of uptake. The model yields a speed of DNA uptake of 900 bp⋅s and a reversal force of 17 pN. Moreover, by comparing...
    Subject(s): Bacterial Transformation ; Gene Transfer ; Molecular Motor ; Translocation Ratchet ; Transformation, Bacterial ; Bacterial Proteins -- Metabolism ; DNA-Binding Proteins -- Metabolism ; Fimbriae, Bacterial -- Metabolism
    ISSN: 0027-8424
    E-ISSN: 1091-6490
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Language: English
    In: European Journal of Communication, December 2013, Vol.28(6), pp.615-629
    Description: When various media in their entirety mark how we articulate our social worlds, we need an approach of mediatization research that reflects this transmediality. To develop such an approach, the article first discusses the ‘institutionalist’ and ‘social-constructivist’ traditions of mediatization research. Both traditions concur in their understanding of mediatization as being a concept to capture the interrelation between the change of media and communication on the one hand, and the change of culture and society on the other hand. Taking this as a foundation it becomes possible to reflect on the role of certain media as ‘moulding forces’, i.e. as certain institutionalizations and reifications of communication. Such a conceptual reflection offers the chance to view the mediatization process as the change of transmedial communicative figurations by which we construct our mediatized worlds. Based on this theoretical foundation, the article subsequently reflects a twofold operationalization,...
    Subject(s): Communication Theory ; Figuration ; Life-World ; Media and Communicative Change ; Mediatization ; Journalism & Communications
    ISSN: 0267-3231
    E-ISSN: 1460-3705
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Article
    Article
    2016
    ISSN: 0163-4437 
    Language: English
    In: Media, Culture & Society, September 2016, Vol.38(6), pp.918-933
    Description: The aim of this article is to draw attention to the phenomenon of media-related pioneer communities. The maker, quantified-self and open data movements have made clear how much an analysis of such pioneer communities can contribute to our understanding of changes in media and communication, together with related social and cultural changes. Pioneer communities do not only possess a marked sense of mission; they also develop ideas of media-related change that can provide orientation for broader social discourses. Studying pioneer communities as intermediaries between the development and the appropriation of new media technologies permits us to grasp current mediatisation processes from the actor’s point of view without the need to first ascribe to them any unifying media logic. Pioneer communities are significant collective actors in the process of ‘deep mediatisation’ – the far-reaching entanglement of media technologies with the everyday practices of our social world. ...
    Subject(s): Maker Movement ; Media Change ; Media-Related Collectivities ; Mediatisation ; Open Data Movement ; Quantified-Self Movement ; Sociology & Social History ; Journalism & Communications
    ISSN: 0163-4437
    E-ISSN: 1460-3675
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Language: English
    In: Journal of the American Chemical Society, 03 April 2013, Vol.135(13), pp.4966-9
    Description: The unsymmetrical tris(imidazolium) salt H3-1(Br)3, featuring a 1,2,4-substitution pattern of the central phenyl ring, after triple imidazolium C2 deprotonation reacts in a one-pot reaction with Pd(OAc)2 and [M(Cp*)(Cl)2]2 (M = Rh(III), Ir(III)) to yield heterobimetallic complexes [3] (M = Rh) and [4] (M = Ir), in which the Pd(II) ion is chelated by two ortho N-heterocyclic carbene (NHC) donors while the third NHC donor coordinates to the M(III) center, which orthometalates the central phenyl ring.
    Subject(s): Chemistry;
    ISSN: 0002-7863
    E-ISSN: 1520-5126
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Language: English
    In: 2012, Vol.7(10), p.e47777
    Description: Avian parents that physically incubate their eggs must balance demands of self-maintenance with providing the proper thermal environment for egg development. Low incubation temperatures can lengthen the incubation period and produce changes in neonate phenotype that may influence subsequent survival and reproduction. We artificially incubated wood duck ( Aix sponsa ) eggs at three temperature regimes (low, 35.0; mid, 35.9; and high, 37.3°C) that are within the range of temperatures of naturally-incubated nests. We tested the effect of incubation temperature on duckling body composition, fledging success, the probability that females were recruited to the breeding population, and their subsequent reproductive success. Incubation period was inversely related to incubation temperature, and body mass and lipid mass for newly-hatched ducklings incubated at the lowest temperature were lower than for ducklings produced at higher temperatures. In 2008, ducklings ( n  = 412) were individually marked and broods ( n  = 38) containing ducklings from each temperature treatment were placed with wild foster mothers within 24 hrs of hatching. Ducklings incubated at the lowest temperature were less likely to fledge from nest sites than ducklings incubated at the higher temperatures. We recaptured female ducklings as adults when they were either prospecting for nest sites ( n  = 171; 2009–2011) or nesting ( n  = 527; 2009–2012). Female ducklings incubated at the lowest temperature were less likely to survive and be recruited to the breeding population than females incubated at higher temperatures. Reproductive success of surviving females also was greater for females that had been incubated at warmer temperatures. To our knowledge, this is the first avian study to link developmental conditions experienced by neonates during incubation with their survival and recruitment to the breeding population, and subsequent reproductive success. These results advance our understanding of incubation as an important reproductive cost in birds and support the potential significance of incubation in influencing the evolution of avian life histories.
    Subject(s): Research Article ; Biology ; Ecology ; Neuroscience ; Evolutionary Biology
    E-ISSN: 1932-6203
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Language: English
    In: Hydrobiologia, 2013, Vol.703(1), pp.239-246
    Description: In addition to the effects of environmental conditions, biotic assemblages may exhibit spatial structure depending on the scale of study. We tested whether the dissimilarity of stream insect assemblages is related to two types of spatial distances (stream corridor and overland distance), and evaluated the relative importance of diversity components at multiple spatial scales. Field data included assemblages of Ephemeroptera, Plecoptera, and Trichoptera found in 16 streams in four microbasins. We evaluated the relationship of the dissimilarity of assemblages with the distance types, using Mantel tests. In addition, we evaluated the relationships among the diversity components at multiple spatial scales, using additive partitioning analysis. The biological dissimilarities were correlated only with the geographical distances. Additive partitioning showed that the values of richness observed in the β1 (among Surber), β2 (among riffles), β3 (among streams), and β4 (among microbasins) were higher than those expected. The highest variation of the richness was found in β3 (30.6%). We conclude that stream faunas are distributed in patches all over the studied spatial extent, causing a weak relationship of biological dissimilarity with distance but important beta components when compared to a completely homogenous distribution of the fauna.
    Subject(s): Additive partitioning ; Alpha diversity ; Beta diversity ; Dispersal ; Neotropical streams
    ISSN: 0018-8158
    E-ISSN: 1573-5117
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Language: English
    In: The Journal of Chemical Physics, 21 January 2015, Vol.142(3)
    Description: The probability distribution describing the state of a Stochastic Reaction Network (SRN) evolves according to the Chemical Master Equation (CME). It is common to estimate its solution using Monte Carlo methods such as the Stochastic Simulation Algorithm (SSA). In many cases, these simulations can take an impractical amount of computational time. Therefore, many methods have been developed that approximate sample paths of the underlying stochastic process and estimate the solution of the CME. A prominent class of these methods include hybrid methods that partition the set of species and the set of reactions into discrete and continuous subsets. Such a partition separates the dynamics into a discrete and a continuous part. Simulating such a stochastic process can be computationally much easier than simulating the exact discrete stochastic process with SSA. Moreover, the quasi-stationary assumption to approximate the dynamics of fast subnetworks can be applied for certain classes of networks. However, as the dynamics of a SRN evolves, these partitions may have to be adapted during the simulation. We develop a hybrid method that approximates the solution of a CME by automatically partitioning the reactions and species sets into discrete and continuous components and applying the quasi-stationary assumption on identifiable fast subnetworks. Our method does not require any user intervention and it adapts to exploit the changing timescale separation between reactions and/or changing magnitudes of copy-numbers of constituent species. We demonstrate the efficiency of the proposed method by considering examples from systems biology and showing that very good approximations to the exact probability distributions can be achieved in significantly less computational time. This is especially the case for systems with oscillatory dynamics, where the system dynamics change considerably throughout the time-period of interest.
    Subject(s): Articles
    ISSN: 0021-9606
    E-ISSN: 1089-7690
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Conference Proceeding
    Conference Proceeding
    2015
    ISBN: 9783319198897  ISBN: 9783319198903 
    ISSN: 03029743 
    In: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2015, Vol.9114, pp.723-727
    Description: Schema.org is one of the main drivers for the adoption of Semantic Web principles by a broad number of organizations and individuals for real business needs. GoodRelations is a well-established conceptual model for representing e-commerce information, one of the few widely used OWL DL ontologies, and since 2012 the official e-commerce model of schema.org. In this tutorial, we will (1) give a comprehensive overview and hands-on training on the advanced conceptual structures of schema.org for e-commerce, including patterns for ownership and demand, (2) present the full tool chain for producing and consuming respective data, (3) explain the long-term vision of Linked Open Commerce, and (4) discuss advanced topics, like access control, identity and authentication (e.g. with WebID); micropayment services, and data management issues from the publisher and consumer perspective. We will also cover research opportunities resulting from the growing adoption and the respective amount of data in RDFa, Microdata, and JSON-LD syntaxes.
    Subject(s): E-Business ; E-Commerce ; Goodrelations ; Json-Ld ; Linked Open Data ; Microdata ; Ontologies ; Owl ; Rdfa ; Schema.Org ; Semantic Web
    ISBN: 9783319198897
    ISBN: 9783319198903
    ISSN: 03029743
    E-ISSN: 16113349
    Source: Scopus (Elsevier B.V)〈img src="https://exlibris-pub.s3.amazonaws.com/Scopus.jpg" style="vertical-align:middle;margin-left:7px"〉
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Conference Proceeding
    Conference Proceeding
    2012
    ISBN: 9783642317521 
    ISSN: 03029743 
    In: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2012, Vol.7387, pp.510-511
    Subject(s): Ebusiness ; Ecommerce ; Goodrelations ; Microdata ; Rdfa ; Schema.Org ; Search Engines ; Semantic Web
    ISBN: 9783642317521
    ISSN: 03029743
    E-ISSN: 16113349
    Source: Scopus (Elsevier B.V)〈img src="https://exlibris-pub.s3.amazonaws.com/Scopus.jpg" style="vertical-align:middle;margin-left:7px"〉
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Language: English
    In: Media, Culture & Society, January 2018, Vol.40(1), pp.114-117
    Description: Dayan and Katz’s book Media Events was so crucial because it challenged the dominance of quantitative communications research focused on measurable discrete ‘media effects’. But meanwhile new challenges have emerged which we called ‘deep mediatization’ – datafication, deeper fragmentation of the audience, and over the longer-term threats to the underlying economic viability of the large-scale integrated media producers that could put on ‘media events’. This makes it necessary to rethink the original definition of media events.
    Subject(s): Datafication ; Deep Mediatization ; Fragmentation ; Media Events ; Sociology & Social History ; Journalism & Communications
    ISSN: 0163-4437
    E-ISSN: 1460-3675
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...