1,720,957 research outputs found
Estudio fitoquímico de extractos de Alternanthera sessilis L.Y su evaluación para el tratamiento de la psoriasis
Get PDFAlternanthera sessilis L. (Amaranthaceae), is a creeping herb that wildly grows in Cuba. Traditionally is used mainly for the treatment of gastric illnesses and as astringent, abortive and diuretic. Our group began the present study because of the use for the treatment of urticarial. A phytochemical study was carried out with the determination of some pharmacognostic assays that include extraction with solvents of increasing polarity that allowed the isolation of carotenoids, triterpenoides and glycosides, now under structure elucidation. The methods used are described. Aqueous extract was evaluated in mice for the possible anti psoriatic activity in comparison with Coriodermine measuring the increase on the epidermis layer on the tail of the experimental animals. Those results are reported for the first time for the plant that produces a positive result for the treatment of this affection of the skin.Alternanthera sessilis L. (Amaranthaceae), es una planta rastrera muy común en Cuba que se utiliza tradicionalmente para afecciones gastro intestinales, así como astringente, abortiva y diurética. Nuestro grupo de trabajo comenzó el estudio para el tratamiento de la psoriasis teniendo en cuenta la referencia de su uso tradicional para la urticaria. Se realiza un estudio Fitoquímico que contempla la determinación de algunos parámetros farmacognósticos y extractos con disolventes de polaridad creciente, aislándose varios compuestos tipo carotenoides, triterpenoides y glicósidos, informándose los métodos de trabajo utilizados y sus resultados más importantes. El extracto acuoso se evalúa en ratones, comparando con Coriodermina, método utilizado por el Centro de Investigaciones Placentarias de Cuba, demostrando que el mismo posee un afecto ligeramente inferior que la Coriodermina en el incremento del espesor de la epidermis. Estos resultados son novedosos para la planta y en estos momentos se evalúan los productos aislados para determinar su estructura química y su contribución al efecto encontrado experimentalmente
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
Contribución al estudio de Cissus sicyoides L. (bejuco-ubí)
No full textSe presenta la descripción micromorfológica de Cissus sicyoides L. (bejuco-ubí) y se resume la composición fitoquímica preliminar, donde se detecta la existencia de aminoácidos, compuestos grasos y flavonoides en toda la parte aérea de la planta, los cuales no habían sido informados con anterioridad en la bibliografía. Se demuestra que el tipo de secado no altera la composición de la droga y se marcan pautas sobre la estabilidad de ésta. Se comprueba que la planta no posee efectos tóxicos ni antivirales contra el virus de la influenza A en cepas victoria H3N2 y WSN (H1N1), para las condiciones en que se desarrolló el estudio
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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