1,720,953 research outputs found
Velocimetría Doppler alterada de arteria oftálmica para predicción de preeclampsia
Get PDFEl objetivo de este estudio fue determinar si la velocimetría Doppler
alterada de la arteria oftálmica es un predictor de preeclampsia, con la finalidad de
establecer un nuevo marcador predictivo para dicha patología.
Materiales y métodos: Se presenta un estudio de tipo cohorte prospectivo,
correlacional y comparativo, el cual consistió en la realización de ecografías Doppler
de arteria oftálmica a 168 gestantes entre las 19 a 23 semanas, que cumplían con
los criterios de inclusión establecidos. Esta muestra fue dividida en dos grupos:
aquellas con índices Doppler normal de arteria oftálmica, y otro con Doppler
alterado. Posteriormente, se revisaron las historias clínicas de dichas pacientes para
distinguir aquellas que desarrollaron preeclampsia y analizar qué índices Doppler
fueron los más capaces de predecir dicha patología.
Resultados: Se incluyeron 168 gestantes de las cuales el 50% presentaron índices
Doppler alterados y, 50%, normales. Del total de gestantes, el 90.5% (152) no
desarrollaron preeclampsia, mientras que el 9.5% (16) fueron diagnosticadas con
ella. Entre los parámetros evaluados mediante la ecografía Doppler se obtuvo: la
velocidad del segundo pico sistólico (PVS2) fue mayor en el grupo con preeclampsia
(24.60 cm/s ± 3.009) en comparación con el grupo sin preeclampsia (22.73 cm/s ±
3.63, p = 0.017), con significancia estadística. El índice de resistencia (IR) fue menor
en el grupo con preeclampsia (0.7556 ± 0.10172) frente al grupo sin preeclampsia
(0.7794 ± 0.07578, p = 0.03); y, el cociente de velocidad de picos sistólicos (PSV
ratio) fue mayor en las gestantes con preeclampsia (0.7506 ± 0.18245) comparado
con aquellas sin preeclampsia (0.6534 ± 0.18268, p = 0.007), aunque ambos sin
significancia estadística. No se observaron diferencias notables en la velocidad del
primer pico sistólico (PVS1, p = 0.255) ni en el índice de pulsatilidad (IP, p = 0.077)
entre ambos grupos.
Conclusiones: La velocimetría Doppler alterada de arteria oftálmica tiene utilidad en
la predicción de preeclampsia; y, de sus índices, el que evidenció mayor capacidad
predictiva de forma autónoma fue el PVS2The objective of this study was to determine whether altered Doppler
velocimetry of the ophthalmic artery is a predictor of preeclampsia, with the aim of
establishing a new predictive marker for this pathology.
Materials and methods: A prospective, correlational and comparative cohort study
is presented, which consisted of performing Doppler ultrasounds of the ophthalmic
artery in 168 pregnant women between 19 and 23 weeks, who met the established
inclusion criteria. This sample was divided into two groups: those with normal
Doppler indices of the ophthalmic artery, and another with altered Doppler.
Subsequently, the clinical histories of these patients were reviewed to distinguish
those who developed preeclampsia and to analyze which Doppler indices were most
capable of predicting this pathology.
Results: 168 pregnant women were included, of which 50% had altered Doppler
indices and 50% normal. Of the total number of pregnant women, 90.5% (152) did
not develop preeclampsia, while 9.5% (16) were diagnosed with it. Among the
parameters evaluated by Doppler ultrasound, the following were obtained: the
second peak systolic velocity (SVP2) was higher in the group with preeclampsia
(24.60 cm/s ± 3.009) compared to the group without preeclampsia (22.73 cm/s ±
3.63, p = 0.017), with statistical significance. The resistance index (RI) was lower in
the group with preeclampsia (0.7556 ± 0.10172) compared to the group without
preeclampsia (0.7794 ± 0.07578, p = 0.03); and the peak systolic velocity ratio (PSV
ratio) was higher in pregnant women with preeclampsia (0.7506 ± 0.18245)
compared to those without preeclampsia (0.6534 ± 0.18268, p = 0.007), although
both without statistical significance. No significant differences were observed in the
velocity of the first systolic peak (PVS1, p = 0.255) or in the pulsatility index (PI, p =
0.077) between both groups.
Conclusions: Altered Doppler velocimetry of the ophthalmic artery was found to be
useful in predicting preeclampsia; and, of its indices, the one that showed the
greatest predictive capacity independently was the PVS2.Tesi
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
- …
