1,721,050 research outputs found
Linda Cook MacDonald portrait, undated
No full textBlack-and-white photograph of Linda Cook MacDonald. The captions on the reverse of the image read, "Linda Cook MacDonald" and "Vocal Workshop Cadek Conservatory." The stamp on the reverse of the image reads, "Would appreciate your returning to; Public Relations; University of Tennessee at Chattanooga; Chattanooga, Tennessee 37401.
Linda Cook MacDonald portrait, undated
No full textBlack-and-white photograph of Linda Cook MacDonald. The captions on the reverse of the image read, "Linda Cook MacDonald" and "Vocal Workshop Cadek Conservatory." The stamp on the reverse of the image reads, "Would appreciate your returning to; Public Relations; University of Tennessee at Chattanooga; Chattanooga, Tennessee 37401.
Detecting a long even hole
No full textFor each integer l >= 4, we give a polynomial-time algorithm to test whether a graph contains an induced cycle with length at least l and even.11Nsciescopu
A tight meta-theorem for LOCAL certification of MSO2 properties within bounded treewidth graphs
No full textProving a Directed Analogue of the Gyárfás-Sumner Conjecture for Orientations of
No full textAn oriented graph is a digraph that does not contain a directed cycle of length two. An (oriented) graph D is H-free if D does not contain H as an induced sub(di)graph. The Gyarfas-Sumner conjecture is a widely-open conjecture on simple graphs, which states that for any forest F, there is some function f such that every F-free graph G with clique number omega(G) has chromatic number at most f(omega(G)). Aboulker, Charbit, and Naserasr [Extension of Gyarfas-Sumner Conjecture to Digraphs, Electron. J. Comb., 2021] proposed an analog of this conjecture to the dichromatic number of oriented graphs. The dichromatic number of a digraph D is the minimum number of colors required to color the vertex set of D so that no directed cycle in D is monochromatic.Aboulker, Charbit, and Naserasr's ->-chi-boundedness conjecture states that for every oriented forest F, there is some function f such that every F-free oriented graph D has dichromatic number at most f(omega(D)), where omega (D) is the size of a maximum clique in the graph underlying D. In this paper, we perform the first step towards proving Aboulker, Charbit, and Naserasr's ->-chi-boundedness conjecture by showing that it holds when F is any orientation of a path on four vertices.Mathematics Subject Classifications: 05C88, 05C8911Ysciescopu
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
Quantifying structural relationships of metal-binding sites suggests origins of biological electron transfer
Full text link© 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).Biological redox reactions drive planetary biogeochemical cycles. Using a novel, structure-guided sequence analysis of proteins, we explored the patterns of evolution of enzymes responsible for these reactions. Our analysis reveals that the folds that bind transition metal-containing ligands have similar structural geometry and amino acid sequences across the full diversity of proteins. Similarity across folds reflects the availability of key transition metals over geological time and strongly suggests that transition metal-ligand binding had a small number of common peptide origins. We observe that structures central to our similarity network come primarily from oxidoreductases, suggesting that ancestral peptides may have also facilitated electron transfer reactions. Last, our results reveal that the earliest biologically functional peptides were likely available before the assembly of fully functional protein domains over 3.8 billion years ago.11Nsciescopu
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
- …
