1,720,954 research outputs found
Potential of phytochemical and biological studies of two African medicinal plants
Get PDFAbstract: This study investigates the potency of some medicinal plants that are commonly used in traditional medicine as antibacterial and antiplasmodial agents. The stem barks of these plant samples were extracted using different solvents in an ascending polarity such as hexane, ethyl acetate, chloroform, methanol and butanol; water (50/50 v/v). Phytochemical analysis was carried out on each of the extracted sample and GC-MS review was performed on each of the crude extracts. Micro serial dilution was used on each crude extract to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration. Moreover, in vivo antiplasmodial activity of each of the crude extracts was also conducted using mice as the experimental animal. Anogeissus leiocarpus has the highest antiplasmodial activity with 82.60% inhibition and unique broad spectral antibacterial activity was obtained by Boswellia dalzielii .Quantitative phytochemical analysis of the crude extracts revealed the presence of significant secondary metabolites which include terpenoids, steroids, alkaloids, phenols, flavonoids, saponins and glycosides. These plants, if properly harness can provide some novel antibiotic and antimalarial drugs.Ph.D. (Chemistry
Determination of Ascorbic Acid Level in Bell Peppers
No full text<p><strong><span>Abstract</span></strong><em><span> </span></em></p>
<p><em><span>The research work determined the vitamin C levels in green and red bell pepper fruits sold in Kontagora market. The analysis of vitamin C level was done by iodimetry titration method.<span> </span>Vitamin C is required by human body to improve the immune system and can be obtained from the bell peppers. Bell pepper has different colours according to the level of maturity, ranging from green, yellow, orange, and red. Differences in colour also make possible differences in vitamin C content. The results show that vitamin C level in Red bell pepper juice contain more ascorbic acid (1.19mg/ml) than the Green bell pepper (0.33mg/ml), indicating that different stages of bell pepper maturity have different vitamin C levels. Therefore, this research recommends that based on the result and comparison with other literatures, further study should be carried out on the effect of heat on the ascorbic level in bell peppers, the amount of calories in bell peppers and also the amount of ascorbic acid level in yellow bell peppers.</span></em></p>
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
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
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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