1,721,016 research outputs found
Morphometric analysis of the heart and aorta in the pediatric population with thoracic computed tomography images
No full textKalpte ve bu büyük damarlarda meydana gelen hastalıkların erken tanı ve tedavisi yaşamın devamlılığı için çok büyük önem arz etmektedir. Özellikle konjenital kalp hastalıklarının çocukluk döneminde erken teşhisi ve tedavisi bireyin yaşam kalitesi için oldukça önemlidir. Bununla birlikte tedavi aşamasında yapılan klinik uygulamaların ve cerrahi işlemlerin daha güvenilir ve başarılı olabilmesi için kalp, aortae ve truncus pulmonalis anatomisi ve morfometrisinin çok iyi bilinmesi gerekmektedir. Tüm bunlar göz önüne alındığında, bu çalışmada pediatrik popülasyonda kalp, aortae ve truncus pulmonalis morfometrisinin değerlendirilmesi amaçlandı. Çalışmamızda 0-18 yaş aralığında 450 pediatrik olgunun multidedektör bilgisayarlı tomografi ile toraks görüntüleri retrospektif olarak incelendi. Kalp, aorta ve truncus pulmonalis ile ilgili uzunluk ve çap ölçümleri aksiyal, koronal ve sagittal planda yapıldı. Olgular yaş gruplarına ve cinsiyetlerine göre ayrı ayrı değerlendirmeye alındı. İstatistiksel analizler sonucunda, çap ve uzunluk ölçümlerinin yaşla birlikte doğru orantılı olarak arttığı ortaya koyuldu (p<0,001). Yaş ile çap ve uzunluk ölçümleri arasında doğru orantılı pozitif bir korelasyon saptandı. Kalp ve aorta ile ilgili tüm parametreler değerlendirildiğinde cinsiyetler arasında istatistiksel olarak anlamlı fark olduğu belirlendi (p<0.001). Erkeklere ait ortalama değerlerin kadınlardan daha büyük olduğu tespit edildi. Sonuç olarak, çalışmamızda ölçüm sonuçlarının yaşa bağlı olarak arttığı belirlendi. Çalışmamızdan elde edilen sonuçlar ile 0-18 yaş aralığına ait morfometrik bir skala oluşturuldu. Bu bağlamda sunulan verilerin pediatrik popülasyonda kalp ve aorta ile ilgili yapılacak klinik uygulamalarda ve cerrahi işlemlerde yardımcı olacağı kanaatindeyiz. Anahtar Kelimeler: Anatomi, Aorta, Kalp, Morfometri, Multidedektör Bilgisayarlı Tomografi, Pediatri, Truncus PulmonalisEarly diagnosis and treatment of diseases occurring in the heart and these large vessels are of great importance for the continuity of life. Early diagnosis and treatment of congenital heart diseases, especially in childhood, is very important for the individual's quality of life. However, in order for clinical practices and surgical procedures performed during the treatment phase to be more reliable and successful, the anatomy and morphometry of the heart, aorta and truncus pulmonalis must be known very well. Considering all these, this study aimed to evaluate the morphometry of the heart, aortae and truncus pulmonalis in the pediatric population. In our study, thorax images of 450 pediatric cases between the ages of 0-18 were retrospectively examined with multidetector computed tomography. Length and diameter measurements of the heart, aorta and truncus pulmonalis were made in axial, coronal and sagittal planes. The cases were evaluated separately according to their age group and gender. As a result of statistical analysis, it was revealed that diameter and length measurements increased in direct proportion with age (p<0.001). A directly proportional positive correlation relationship was detected between age and diameter and length measurements. When all parameters related to the heart and aorta were evaluated, it was determined that there was a statistically significant difference between genders. (p<0.001). It was determined that the average values for men were greater than for women. As a result, it was determined that measurement results increased with age in our study. With the results obtained from our study, a morphometric scale for the 0-18 age range was created. We believe that the data presented in this context will be helpful in clinical practices and surgical procedures regarding the heart and aorta in the pediatric population. Keywords: Anatomy, Aorta, Heart, Morphometry, Multidetector Computed Tomography, Pediatrics, Pulmonary Trun
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
Impact of Bisphenol A on neural tube development in 48‐hr chicken embryos
No full textAtay, Emre/0000-0002-2378-1183; Bozkurt, Erhan/0000-0002-1853-7098WOS:000564672600001PubMed: 32864885Objectives Bisphenol A (BPA) is one of the most heavily produced chemicals in the world. BPA is involved in the production of many substances such as cosmetics, various foodstuffs, toys, personal care products, detergents and plastic bottles all that are frequently used in daily life. Depending on BPA exposure, sexual maturation and reproductive function, and bone and brain development are adversely affected. The aim of this study is to investigate the possible effects of BPA on the development of the nervous system and neural tube in 48-hr chicken embryos. Methods Thirty specific pathogen-free (SPF) fertilized eggs were used in the study. SPF eggs were placed in the incubator and divided into three groups at 28 hr of incubation; control, BPA 1 and BPA 2 (10 eggs in each group). At this stage of incubation, two different doses of BPA were injected sub-blastodermically with the Hamilton microinjector. At the end of 48 hr of incubation, all eggs were opened and embryos were dissected and separated from the embryonic membrane. All embryos were evaluated morphologically and histopathologically. Results As the BPA dose increased, delays in the development of the nervous system and midline closure increased in the early period of chicken embryos. Depending on the dose, it was found that the embryo's crown-rump length and somite number decreased (p < .05). Conclusion It was determined that BPA application on early chicken embryos adversely affected neural tube development. It was also found to delay midline closure
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
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