1,720,982 research outputs found
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
EFFECT OF ASCORBIC ACID CONCENTRATION ON STRUCTURAL CHARACTERISTICS OF APPICAL MERISTEMS ON in vitro Aloe barbadensis Mill.
Get PDFAscorbic acid is one of the major metabolite in higher plants cells which is known as effective factor when the cells enter to “S” phase from “G1” phase of cytokinesis. This metabolite has antioxidant activity and increases plant tolerance against stressors such as salinity, pathogens, ozone, UV rays, etc. The current study used the common cellular and histological methods to evaluate the effect of 0.05 to 2.5 mM ascorbic acid on vegetative meristems of Aloe barbadensis plants obtained from stem explants propagated in vitro culture conditions. Results showed that low concentrations of ascorbic acid (0.5 to 1 mM) increase mitotic index in apical meristem and root quiescent center (QC). Moreover, treatment with ascorbic acid increases cellular dimensions in cell elongation region of root and mitotic divisions in this region. In some measurements, it was clear that in addition to increase root length in plants treated with ascorbic acid, distance from root hairszone to root cap increases compared to the control, which is a logical conclusion from increasing cell elongation and divisions in cell elongation zone. Also, ascorbic acid increased production of secondary roots through stimulating cells of pericycle and increasing divisions in this region. Apical meristem of stem treated with ascorbic acid had more convexity homogenous with more chromophilic level. Increasing stem length and number of leaves in plants treated with ascorbic acid could be related to the high cells’ mitotic activity in stem apical meristem. Moreover, ascorbic acid could stimulate cell division, increasing area of meristem zone, and effective on severity of differentiation
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
MICROPROPAGATION OF TEN WEEKS (Matthiola incana) AND LISIANTHUS (Eustoma grandiflorum) (TWO ORNAMENTAL PLANTS) BY USING KINETIN (KIN), NAPHTHALENE ACETIC ACID (NAA) AND 2,4-DICHLOROPHENOXYACETIC ACID (2,4-D)
Get PDFMicropropagation is a powerful tool for large-scale propagation of pathogenfree ornamental plants. Studies on micropropagation of ten weeks and lisianthus is relatively low, thus, here we present a reliable method for in vitro propagation of these two ornamental plants. The shoot tips explants from Eustoma grandiflorum and Matthiola incana were cultured on MS medium supplemented with concentrations of 0, 0.5, 1 and 2 mg·L of naphthalene acetic acid (NAA) and kinetin (KIN). In Eustoma grandiflorum, multiple shoots containing roots can be obtained simultaneously on MS basal medium only supplemented with 0.5–1 mg·L KIN. Shoot tips media supplemented with 1 mg·L KIN without NAA resulted in the best shoot length (2.158 cm) and shoot number (2.68). Also, the most nodes (8.75) were obtained in medium containing 0.5 mg·L KIN without NAA. The highest root number (2.55) was seen in medium supplemented with 2 mg·L KIN + 0.5 mg·L NAA. Shoot tips grown in medium containing 2 mg·L NAA without KIN showed the most callus formation. The highest content of fresh weight, dry weight and chlorophyll content were calculated in plantlets grown on media containing 0.5 mg·L KIN without NAA, 0.5 mg·L KIN + 1 mg·L NAA and control, respectively. In Matthiola incana, four-week-old in vitro plants obtained from micro-cuttings showed successful shooting and rooting. MS medium supplemented with 2 mg·L KIN without NAA resulted in the best shoot length (1.166 cm) and largest number of node (4.64). When the shoot tips were inoculated in the medium containing 2 mg·L NAA without KINand medium containing the combination of 1 mg·L NAA + 2 mg·L KIN, the best result was observed for root number (1.85) and root length (5.2 cm)
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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