1,721,097 research outputs found
Data for the application of a robust MALDI mass spectrometry approach for bee pollen investigation
No full textThe dataset contains results on honeybee pollen extracted and analyzed with MALDI MS.
Our experiment involved honeybee pollen grains from five different Italian regions (Campania, Sardinia, Sicily, South Tirol and Tuscany) through the spring 2023. Pollen sample were collected from the honeybee colonies with standard pollen traps every two weeks for four months. The generated dataset concern different pollen extraction methods. In order to define the best experimental conditions to record robust and the most representative and distinguishable spectra for a pollen species, different conditions of extraction were tested, four different solutions: (a) 2M acetic acid 2M (2M AA) and 50% acetonitrile (50% ACN); (b) AA 2M; (c) 2% ACN and 0.1% trifluoroacetic acid (0.1% TFA); and (d) a solution of 1% TFA) and two mechanical extraction methods (stirring and ultrasonication). Moreover, 10-fold serial dilutions of the crude extracted material from the different bee pollen balls were evaluated (10, 100 and 1,000 times) to determine the most appropriate sample to matrix ratio
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
Immunoproteome analysis of the honeybee in response to environmental stressors.
No full textLe phénomène mondial d’effondrement des colonies d’abeilles domestiques peut être expliqué par l’exposition de celles-ci à différents stresseurs (biotiques et abiotiques) qui peuvent agir seuls ou en synergie. L’impact de ces stresseurs sur la santé des abeilles, surtout lorsqu’ils sont multiples, est largement débattu. Dans le cadre de l’infection par Nosema, une microsporidie présente dans le tube digestif de l’abeille, de nombreuses études semblent indiquer que la multiplication des spores affecte l’épithélium de la paroi intestinale et donc stimule une réponse immunitaire épithéliale. Cependant, montrer que la réponse immunitaire systémique (visible au sein de l’hémolymphe) est bien stimulée, reste un cap à franchir particulièrement délicat. Le but de la thèse est de mieux comprendre les interactions qui se créent entre l’hôte (Apis mellifera) et le pathogène (Nosema spp.). Nous avons étudié pour cela le système immunitaire tissulaire (tube digestif) et circulant (hémolymphe) de l’hôte par des approches complémentaires de spectrométrie de masse (empreintes moléculaires massiques par MALDI BeeTyping®, approches de protéomique fine sur des segments de tube digestif et imagerie moléculaire par MALDI) dans un contexte d’infection contrôlée ou naturelle par des spores de Nosema spp. Nous avons mis en évidence de nouveaux marqueurs moléculaires de la santé de l’abeille à partir de l’hémolymphe d’abeilles infectées de manière précoce par Nosema et à partir du tube digestif de ces mêmes abeilles. De plus nous avons développé la méthode de MALDI Biotyping sur notre modèle de microsporidies pour identifier l’espèce à moindre coût. Ces différents éléments permettront le développement de nouveaux outils de diagnostic voir de pronostic pour assister l’apiculteur ou les services sanitaires dans le suivi de leur rucher.The loss of honeybee colonies could be explained by multiple stress factors (biotic or abiotic) that could act alone or in synergy to perturb the physiology of the domestic bees. The impact of these stressors on the bee health is widely discussed. In the miscrosporidiosis, an infection due to Nosema, the impact of this stressor on the systemic immune response (haemolymph being the mirror of this response) and the epithelial response (gut tissue as target) remains unsatisfactory documented. In the context of an infection by Nosema spp, the spore multiplication that is occurring at the level of the midgut stimulate the gut epithelial immune response. While at the same time, the stimulation of the systemic immune response remains an opened question. The aim of this thesis is to decipher the cross-talk existing between the host (A. mellifera) and the pathogen (Nosema spp.). We investigated the epithelial (gut tissues) and circulating bee immune response (haemolymph) using complementary mass spectrometry approaches (molecular mass fingerprints by MALDI BeeTyping®, untargeted proteomics and MALDI imaging) in a context of a controlled or natural infection by Nosema spores. We have demonstrated new molecular markers of bee health from hemolymph and bees early infected with Nosema from digestive tract. In addition, we have developed the MALDI Biotyping method on our microsporidia model to identify the species at a lower cost. These different elements constitute the development of new diagnostic and even prognostic tools to assist the beekeeper or the health services in their apiary monitoring
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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