1,720,994 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
ROVE BEETLE PALAEOBIOLOGY AT THE NATURAL HISTORY HISTORY MUSEUM OF DENMARK Poster - Fossil Record in Resins and Sediments (University of Gdańsk, 23–26 May 2023)
No full textPoster for Fossil Record in Resins and Sediments (University of Gdańsk, 23–26 May 2023)</p
<em>Paraphloeostiba dominicana</em> sp.n., male, Dominican amber, Do–556–K, X-ray microtomography volume rendering of the habitus.
No full textParaphloeostiba dominicana sp.n., male, Dominican amber, Do–556–K, X-ray microtomography volume rendering of the habitus</p
Total-evidence data matrix for TJSP-2024-0003.R1 - Rogue sawflies: Rare late Eocene amber fossils provide new calibration points for dating the evolution of Tenthredinoidea (Insecta: Hymenoptera)
No full textAbstract: True sawflies (Tenthredinoidea) have a substantial fossil record but are rarely encountered in Eocene ambers. Here we describe three new taxa from late Eocene ambers in this superfamily. †Rovnotaxonus aristovi n. gen. & sp. is the first true sawfly reported from Rovno amber. Based primarily on characters in the fore wing venation, we assign the new taxon to Tenthredinidae: Allantinae: Allantini. We also describe two new species of Diprionidae from Baltic amber: †Eodiprion pectinatus n. sp. from a female specimen and †Monodiprion gladius n. gen. & sp. from a male previously reported as †Eodiprion sp. by Schedl (2008); we redescribe †Eodiprion Schedl, 2007 and provide emended diagnoses of the genus and of †Eodiprion groehni Schedl, 2007. We integrate all these fossils as well as †Sambia Vilhelmsen & Engel, 2012 (Tenthredinidae: Tenthredininae) previously described from Baltic amber in a combined data set assembled from previously published morphological and molecular data sets. We analyze the combined data set in a Bayesian framework and implement RoguePlots to evaluate the positions of the fossils. The diprionid fossils are unequivocally placed inside Diprionidae, in a polytomy with extant members of Diprioninae; the Monocteninae, the other subfamily currently recognized in the family, is not retrieved as monophyletic. †Rovnotaxonus is placed inside Allantinae and shares some characters with Taxonus. †Sambia is placed near the base of Tenthredininae. The evaluation of the phylogenetic position of the fossils treated here will make them available for future dating analyses of Tenthredinoidea, helping to further elucidate the evolutionary history of this significant lineage of herbivorous insects. Possible reasons for the comparatively low abundance of true sawflies in late Eocene ambers are discussed.Methods: We explored phylogenetic placement of the three fossils by including them in the most comprehensive total-evidence phylogeny (TEP) of the Tenthredinidae published so far. Our total-evidence analysis was based on previously published morphological and molecular phylogenies which had significant overlap in taxon sampling. Despite this and to maximize overlap in taxon sampling, it was necessary to create taxon chimeras between the morphological and molecular data (Supplementary Material Table 1). Morphological data from the three fossils were scored into the matrix of Vilhelmsen (2015) in Mesquite 3.70 (Maddison and Maddison, 2021). The morphological dataset was then combined with the molecular dataset of Malm & Nyman (2015). Specifically, we used molecular data from the ’12 + CAD3 + GLN3_hym’ dataset (Appendix S3 in Malm & Nyman 2015), which includes data from nine protein-coding genes (eight nuclear, one mitochondrial), including fragments of: CAD, gelsolin (GLN), glycogen synthase (GS), isocitrate dehydrogenase (IDH), sodium-potassium adenosine triphosphatase (NAK), phosphogluconate dehydrogenase (PGD), POL, and triose-phosphate isomerase (TPI), and a fragment of the mitochondrial COI. For details of sequence generation, alignment and partitioning readers are referred to Malm & Nyman (2015). Our final matrix included 191 taxa, 5164 base pairs of molecular data from nine protein-coding genes and 146 morphological characters; the dataset can be downloaded from https://doi.org./xx.xxxx/xx.figshare.xxxxxxxx.For the Bayesian inference of the TEP dataset we used the same parameters as Malm & Nyman (2015) with the addition that the morphological partition was analyzed under the Mk + G (Gamma) model (Lewis, 2001) and the analysis was run for 80 million generations. Urocerus gigas (Siricidae) was set as the outgroup. Computation for the TEP using MrBayes (Ronquist et al., 2012b) was performed on the National Life Science Supercomputing Center - Computerome 2.0 (www.computerome.dk). We used R/RoguePlots (Klopfstein & Spasojevic 2019; R Core Team 2021) to explore phylogenetic placement of the three fossil taxa in all output trees of the Bayesian analysis. The online blog by Mario Coiro (https://mariocoiro.blog/2020/12/02/how-torepresent-uncertainty-in-phylogenies-rogueplots-to-the-rescue/) was also useful when implementing RoguePlots. Statistical support for placements of the three fossil taxa was summarized using a majority-rule consensus tree and the post burn-in combined runs from the Bayesian analyses.</p
<em>Paraphloeostiba dominicana</em> sp.n., male, Dominican amber, Do–556–K, X-ray microtomography colume rendering the aedeagus.
No full textParaphloeostiba dominicana sp.n., male, Dominican amber, Do–556–K, X-ray microtomography colume rendering the aedeagus. </p
RTI <i>Oxyporus impressus </i>Piton, 1940 (Coleoptera: Staphylinidae: Oxyporinae), Paleocene of Menat, France
No full textThe holotype (MNHN.F.R07021) is deposited at the Fossil collection (F) of the Muséum national d'Histoire naturelle (MNHN - Paris) – F (Olivier Béthoux). Reflectance transformation imaging (RTI) files were generated to provide documentation of morphological features best appreciated under varied light orientations. For each RTI file, 42 photographs were taken using a ~30 cm diameter, automated light dome driving a Canon EOS 5DS digital camera coupled to a Canon MP-E 65 mm macrolens. Original photographs were optimized using Adobe Photoshop CS6 prior to RTI-processing, itself achieved using the RTIbuilder software (Cultural Heritage Imaging). The RTI data is available at: NNNNNN and can be viewed using the RTIviewer software, available herehttps://culturalheritageimaging.org/What_We_Offer/Downloads/View/index.html.</p
NHMD-36909-Proteinus-Baltic-amber-microCTdata
No full textRaw microCT data for NHMD-36909-Proteinus-Baltic-amber-microCTdata </p
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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