1,721,025 research outputs found
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
INDIVIDUAZIONE DI INDICATORI DI QUALITÀ E MIGLIORAMENTO DEL PROCESSO PRODUTTIVO IN DRUPACEE (PESCO) MEDIANTE METODOLOGIE PROTEOMICHE INNOVATIVE
No full textFruit ripening is a complex process genetically determined and environmentally regulated that involves drastic changes in various physiological and biochemical aspects. These events include chlorophyll breakdown, increased starch degradation and simple sugar biosynthesis, development of aroma components and fruit softening. All these events have a direct impact on the definition of fruit quality and are accompanied and/or at least partially influenced by less visible processes like ethylene evolution and respiration. These phenomena are typical of a class of fruits like tomato, banana and peach (the so-called climacteric fruits). In particular, peach fruit development follows a sigmoidal curve divided into four stages [S1, cell division and expansion; S2, pit hardening and slowdown in fruit growth; S3, increase in fruit size due to cell enlargement; S4, ethylene production and increased respiration (climacteric peak)]. Afterwards the ripening process comes to an end and fruits start senescing.
The transition from the pre-climacteric to the climacteric phase is a critical step for fruit development and has been studied with a transcriptomic approach in peach fruit by means of the first available fruit microarray gene chip μpeach 1.0.
The aim of the first part of this PhD research was the study of this transition in peach fruit with a proteomic approach. Peach is a typical climacteric fruit whose rapid softening in postharvest makes it particularly susceptible to handling and manipulation. Actually, different flesh firmness phenotypes at maturity are known. Most of the economically relevant peach varieties are divided into melting flesh (MF) and non melting flesh (NMF) phenotypes: they both soften but this event is more relevant in MF than in NMF cultivars. This behaviour makes MF peaches soft and juicy, and particularly appreciated by the consumers but shortens their shelf life, while NMF peaches have good keeping qualities but are less appreciated for fresh consumption. In order to perform the proteomic analysis proteins from freeze-dried mesocarp samples at S3 and S4 ripening stages of the cv Bolero (MF) and cv Oro A (NMF) were resolved by 2D PAGE on a linear 3-10 pH range and 24 cm 12.5% polyacrylamide gels. Gel image and statistical analyses, conducted with ImageMaster Platinum 5.0 and the ANOVA test (p<0,01), respectively, showed that 53 spots had a statistically relevant 2-fold expression change. By means of LC-ESI MS/MS we found that some proteins were involved in different physiological processes (i.e. sugar metabolism, ethylene evolution, amino acid metabolisn and stress response) typical of fruit development and ripening. These data, however, describe only a short moment of a complex and very long process like fruit ripening. For this reason, the second part of this PhD research focused on the comparative proteomic analysis of a complete growth curve of a single cultivar, cv Springcrest (MF). Drupes of five ripening stages (S1, S2, S3, S4 I and S4 II), established according to the literature, were sampled in the period April-June 2008 and protein extraction and separation by 2D-PAGE were performed after the optimization of the extraction protocol. Mesocarp proteins were resolved by basic loading of 400 micrograms onto a linear 4-7 pH range 24 cm Immobiline dry strips followed by SDS-PAGE on 10% polyacrylamide gels. In silico and statistical analyses, conducted with ImageMaster Platinum 5.0 and the ANOVA test (p<0,001), respectively, showed that 98 spots had a statistically relevant 2-fold expression change. The hierarchical clustering analysis grouping the 98 variations revealed that, while S1 and S2 are quite similar and the S4I and S4II as well, S3 shows a peculiar and totally different behaviour when compared to the first and last two ripening stages. The mass spectrometry analysis aiming at the identification of the differentially expressed proteins is now in progress
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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