1,720,956 research outputs found
Amniotic fluid nitric oxide and uteroplacental blood flow in pregnancy complicated by intrauterine growth retardation
No full textTo examine the correlation between placental nitric oxide production and uteroplacental blood flow. Thirty-one pregnant women with fetuses with intrauterine growth retardation and 27 normal pregnancies as controls. Correlation between amniotic fluid measurements of nitrite metabolite in the third trimester and flow velocimetry waveforms recorded from uterine, umbilical and fetal middle cerebral arteries. Intrauterine growth retarded pregnancies were compared with controls. Concentrations of nitric oxide metabolites (NO2- and NO3-) in amniotic fluid were correlated with flow velocimetry waveforms findings by the determination of correlation coefficient. Overall median nitrite values in amniotic fluid were higher (P < 0.01) in intrauterine growth retarded patients (median 8.6 micromol/mg creatinine) than in controls (5.6 micromol/mg creatinine). Pathologic uterine flow velocimetry waveforms in uterine artery (-2SD) were observed in 12 women of the intrauterine growth retarded group, and the concentration of amniotic fluid nitrite was significantly lower (P < 0.01) in these patients (median 4.45 micromol/mg creatinine) than in those with normal flow velocity waveforms (median 11.43 micromol/mg creatinine). A significant negative correlation was observed between nitrite concentrations and uterine artery resistance index, umbilical artery pulsatility index and umbilical artery pulsatility index:middle cerebral artery pulsatility index ratio. We conclude that placental nitric oxide is significantly associated with uteroplacental blood flow and may be important in maintaining adequate uteroplacental perfusion in intrauterine growth retarded pregnancies
Transvaginal ultrasonographic diagnosis of adenomyosis in female patients suffering from uterine fibromatosis
No full textAdenomyosis is an underestimated pathology frequently responsible of unknown origin pelvic pain and uterine enlargement. It is hyperestrinic condition with poor specific symptomatology and preoperative diagnostic tools are very few. The most important of them, ultrasound, has improved its diagnostic capacity with the introduction of transvaginal way of examination. However, for the ultrasound resemblance, the common etiopathogenetic origin and the symptomatologic likeness between adenomyosis and uterine leiomyomatosis, a problem still open is the differential diagnosis between these two pathologies especially when both are present in the same subject. In our study where the preoperative ultrasound was followed by surgical finding, we try to give some ultrasonographical guidelines to discern among these two pathologic conditions
Transvaginal sonographic evaluation of endometrial polyps: A comparison with two dimensional and three dimensional contrast sonography
No full textEndometrial polyps are a frequent cause of menorrhagia and are often associated with infertility. Routine transvaginal (TV) ultrasound evaluation may detect intrauterine anomalies. Sonographic evaluation of the endometrium after uterine cavity distention, called hystero-sono-salpingography (HSSG), improves the resolutive effectiveness of TV sonography. Recently the development of three-dimensional (3D) scanning of the uterine cavity has provided accurate images. The purpose of this study was to compare conventional 2D and 3D scanning of the uterine cavity with or without saline contrast medium in the detection and evaluation of focal endometrial polyps. Twenty-three patients out of 642 women suggestive for intrauterine anomalies at routine TV sonogram were examined by 2D and 3D sonography before and after intrauterine saline contrast medium. Sonographic appearance was verified by hysteroscopic and histologic evaluation. Two-dimensional TV sonography diagnosed 23 polyps versus 16 confirmed at hysteroscopic and histologic examinations, revealing a specificity of 69.5%; 2D TV HSSG diagnosed 17 polyps, with a specificity of 94.1%; 3D TV sonography diagnosed 18 polyps, with a specificity of 88.8%; 3D HSSG diagnosed 16 polyps according to hysteroscopic and histologic findings, with a specificity of 100%. HSSG has been demonstrated to be an effective and suitable method in the detection of intrauterine anomalies, particularly with 3D sonography
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
- …
