1,720,960 research outputs found
Critical limb ischaemia: l'utilizzo della vena ombelicale umana criopreservata negli interventi di rivascolarizzazione periferica.
No full textBACKGROUND: la vena ombelicale umana conservata in glutaraldeide è stata utilizzata per circa 30 anni nelle riscostruzioni infrainguinali per arteriopatia degli arti inferiori. Nella nostra esperienza, limitatamente ai pazienti che presentavano ischemia critica degli arti inferiori, la pervietà primaria seconadaria e il salvataggio d'arto sono stati rispettivamente del 39,9%, 58,5% e 61,5% a 4 anni, senza un numero statisticamente significativo di trombosi post-operatorie del by-pass o evoluzioni aneurismatiche. L'esperienza con vene ombelicali cri preservate (cHUV) è limitata ad alcuni studi nei quali viene investigato il potenziale utilizzo nelle ricostruzioni vascolari.
Lo scopo dello studio è di valutare pervietà primaria e secondaria del graft e salvataggio d'arto, in un singolo centro, in una serie consecutiva di by-pass utilizzando cHUV.
METODI :tra Settembre 2008 e Gennaio 2012, 50 pazienti sono stati sottoposti a rivascolarizzazione periferica, utilizzando cHUV, con rinforzo esterno in mesh di Dacron. Le indicazioni per la rivascoalrizzazione erano: ischemia critica, lesione ulcerative o gangrena degli arti inferiori, assenza di patrimonio safenico. L'anastomosi distale è stata eseguita nel 94% dei casi al di sotto del ginocchio 33 poplitea, 6 arterie tibiali, 8 interossea). Una fistola artero-venosa è stata confezionata nel 54% dei casi e nel 70% si trattava di chirurgia di rifacimento.
RISULTATI: età media della popolazione è stata di 73,3±7,3 anni, con prevalenza degli uomini (66%) mentre il 46% dei pazienti era diabetico. La pervietà primaria è stata del 83% e del 78% ad 1 e 2 anni rispettivamente. La pervietà secondaria è stata del 82% e 77% ad 1 e 2 anni rispettivamente. Il salvataggio d’arto è stato del 86% e del 77% ad 1 e 2 anni rispettivamente. In un caso si è verificata una trombosi acuta del graft nell’immediato post-operatorio. Non sono state evidenziate evoluzioni aneurismatiche del cordone ombelicale.
CONCLUSIONI: l’uso della vena ombelicale umana criopreservata ha dato risultati, al momento, soddisfacenti in termini di pervietà primaria e salvataggio d’arto e potrebbe rappresentare una valida alternativa per l’utilizzo nelle ricostruzioni vascolari periferiche nei pazienti affetti da ischemia critica degli arti inferiori.BACKGROUND: Glutaraldehyde stabilized human umbilical veins (HUV) have been used for infrainguinal arterial reconstruction for almost three decades. In our experience primary patency, secondary patency and limb salvage was rispectively 39,9%, 58,5% and 61,5% at 4 years, not signicatively were post-operative thrombosis and aneurysm evolution. Experience with cryopreserved (cHUV) is limited and only few studies specifically investigated its feasibility for bypass grafting.
The aim of the study is to establish primary and secondary graft patency as well as limb savage in a single center consecutive series of bypasses grafting with cHUV.
METHODS: Between September 2008 and January 2012, 50 patients underwent lower limbs revascularization procedures by using cHUV coated with a Dacron mesh at the operating table. Indications for revascularization with cHUV were: critical limb ischaemia, rest pain, small ulcers and gangrene when autologous saphenous vein was absent. Distal anastomosis was performed in 94% of cases below the knee (33 on popliteal artery, 6 on tibial arteries, 8 on peroneal artery). An artero-venous fistula was performed in 54% of the patients and in 70% of cases the bypass grafting was a redo surgery. All the bypasses performed were reviewed for primary and secondary graft patency as well as limb salvage.
RESULTS: Mean population age was 73,3±7,3 with higher prevalence of male (66%) and 46% of diabetic patients. Primary patency was 83% and 78%, after 1 and 2 years respectively. Secondary patency was 82% and 77%, after 1 and 2 years respectively. Limb salvage rate was 86% and 77% after 1 and 2 years. Early graft thrombosis was observed in one patient. We did not observe aneurismal cHUV graft degeneration.
CONCLUSIONS: use of cryopreserved HUV provides acceptable patency and limb savage rates representing a valuable alternative for bypass grafting in critical lower limb ischemia
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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