1,720,958 research outputs found
Diagnosis of post-surgical fine-needle aspiration biopsies of thyroid lesions with indeterminate cytology using HRMAS NMR-based metabolomics
No full textIntroduction: Ultrasound examination coupled with fine-needle aspiration (FNA) cytology is the gold standard for the diagnosis of thyroid cancer. However, about 10–40% of these analyses cannot be conclusive on the malignancy of the lesions and lead to surgery. The cytological indeterminate FNA biopsies are mainly constituted of follicular—patterned lesions, which are benign in 80% of the cases. Objectives: The development of a FNAB classification approach based on the metabolic phenotype of the lesions, complementary to cytology and other molecular tests in order to limit the number of patients undergoing unnecessary thyroidectomy. Methods: We explored the potential of a NMR-based metabolomics approach to improve the quality of the diagnosis from FNABs, using thyroid tissues collected post-surgically. Results: The NMR-detected metabolites were used to produce a robust OPLSDA model to discriminate between benign and malignant tumours. Malignancy was correlated with amino acids such as tyrosine, serine, alanine, leucine and phenylalanine and anti-correlated with myo-inositol, scyllo-inositol and citrate. Diagnosis accuracy was of 84.8% when only indeterminate lesions were considered. Conclusion: These results on model FNAB indicate that there is a clear interest in exploring the possibility to export NMR metabolomics to pre-surgical diagnostics
Metabolomics allows the discovery of relevant biomarkers
No full textCette thèse présente une approche multicompartimentée en métabolomique appliquée au diagnostic des tumeurs indéterminées de la thyroïde et à la caractérisation de l’effet du fructo-oligosaccharide sous condition de régime hyperlipidique chez la souris. L’objectif était de montrer qu’une telle approche permettrait de visualiser de façon plus globale des modulations du métabolisme induites, et par conséquent, d’améliorer la pertinence des marqueurs discriminants identifiés. Dans le cas de l'analyse nutritionnelle, l’analyse mono-compartimentée des différentes organes/segments intestinaux des souris ont permis de mettre en évidence les voies métaboliques affectées par le régime hyperlipidique mais pas d’observer un effet significatif du prébiotique FOS. Dans le cas du cancer de la thyroïde, l’étude multicompartimentée n’a pas pu être mise en place dans de bonnes conditions (problème de prélèvement d’échantillons). Cependant, l’analyse métabolomique monocompartimentée basée sur l’analyse HR-MAS des ponctions prélevées à l’aiguille fine a mené à une discrimination significative entre les lésions bénignes et malignes avec une prédictivité similaire aux tests moléculaires actuellement disponibles. En parallèle, nous avons exploré la technique HR-MAS à rotation lente dans le but de préserver l’intégrité des tissus au cours des expériences. L’utilisation de cette technique s’accompagne d’un certain nombre d’inconvénients que nous avons contournés en utilisant des séquences RMN particulières, et en mettant en place un protocole robuste de préparation d’échantillons. Enfin, nous avons évalué le filtre T1ρ et son application en métabolomique comme alternative au filtre T2.This thesis presents a multicompartmental metabolomics approach applied to the diagnosis of indeterminate thyroid tumours and to the characterization of the effect of fructo-oligosaccharide (FOS), a prebiotic, under high fat diet condition in a mouse model. The aim of this project is to show that such approach could lead to a more global visualization of the induced metabolic modulations, and therefore, improve the identified discriminant markers relevance. Regarding the diet study, the mono-compartmental analysis of the different mouse organs/intestine segments enabled us to identify metabolic pathways affected by the high fat diet whereas the effect of FOS could only be characterized for the feces samples collected at day 28. Regarding the thyroid cancer study, the multi-compartmental approach could not have been continued due to sample handling issues. However, the classical metabolomics analysis of the fine-needle aspiration biopsies (FNAB) from patients with benign or malignant tumours led to a clear discrimination between both groups with a predictivity similar to that of commercial diagnosis tests. In the meantime, we explored the slow-spinning NMR HR-MAS technique in order to preserve the integrity of the tissues during the experiments. The use of this technique is accompanied by a number of drawbacks that we have avoided using special NMR sequences, and putting in place a robust protocol for sample preparation. Finally, we evaluated the T1ρ filter and its applications to metabolomics as an alternative to T2 filter
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
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