1,720,954 research outputs found
Molecular Cytogenetics as a Tool for Primate Taxonomic identification: A Case Study in Captivity
No full textcaratteristiche peculiari essendo notturne e monogame. Hanno
un’ampia distribuzione geografica che si estende dallo stretto di
Panama al nord dell’Argentina; questo determina una notevole complessità
nella distribuzione e di conseguenza nell’interpretazione
sistematica e filogenetica. Lo studio del genere Aotus mediante
l’analisi di caratte ri morfologici e genetici ha prodotto una tassonomia
controversa. Inizialmente era riconosciuta solo la specie Aotus
trivirgatus, successivamente in base alla colorazione del pelo del
collo, alla diversa suscettibilità alla malaria e ai dati citogenetici
sono state identificate fino a nove specie, oltre a due sibling species,
per un totale di 11.1,2 Il numero diploide di cromosomi in Aotus varia
da 46 a 56; nel cariotipo sono presenti molti polimorfismi dovuti
all’ibridazione che si verifica in specie simpatiche; in alcune specie
è presente una traslocazione Y-autosoma. Le undici specie sono
state suddivise in due gruppi monofiletici: il gruppo grey-black neck
distribuito a nord e il gruppo red neck distribuito a sud del Rio delle
Amazzoni. Le specie del gruppo red neck sono omogenee da un
punto di v ista del cariotipo con un numero diplolide 2n=49
(maschio)/50 (femmina) e una traslocazione Y- autosoma. Le specie
del gruppo grey-black neck presentano numero diploide di cromosomi
variabile, con il più basso 2n=46 in A. vociferans e il più alto
2n=56 in A. lemurinus. Solo due specie (Aotus nancymae e Aotus
lemurinus) sono state analizzate mediante la citogenetica molecolare
(painting cromosomico). Quest’analisi ha permesso di dimostrare
che le specie del genere Aotus posseggono un cariotipo piuttosto
derivato se confrontato con quello ipotetico ancestrale delle
Platyrrhinae, da cui si è originato attraverso fusioni, fissioni, traslocazioni
ed inversioni.3-5
L’identificazione tassonomica di taxa di Aotus mediante l’analisi
cromosomica rappresenta, in cattività, il prerequisito per programmi
di breeding in quanto la ricostruzione del cariotipo bandeggiato è
l’unico approccio per identificare la maggior parte delle specie del
genere Aotus. Mediante le tecniche citogenetiche vengono identificati
individui compatibili da un punto di vista cromosomico che possono
essere incrociati tra loro al fine di evitare ibridazioni interspecie6
e favorire la conservazione delle diverse specie.
L’obiettivo del presente lavoro riguarda l’identificazione mediante
bandeggio cromosomico di individui di una colonia di Aotus, al fine
di avviare un programma di conservazione delle specie mediante
breeding. Il gruppo di scimmie, originario della Bolivia, è presente in
Giappone dal 1977 presso The Primate Research Institute di Tokyo;
tra gli individui della colonia si è inavvertitamente verificata la produzione
di ibridi prima che fossero riconosciute le diverse specie del
genere. Si riportano dati preliminari sull’identificazione di individui
idonei da incrociare, in particolare il cariotipo bandeggiato di un
maschio di A.l griseimbra (2n=54) (Figura 1). Inoltre si sono revisionati
dati citogenetici presenti in letteratura su Aotus al fine di sottolineare
l’importanza della citogenetica classica e molecolare negli
studi filogenetici e in quelli riguardanti la conservazione delle speci
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
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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