1,721,095 research outputs found
Re: "Chronic Helicobacter pylori infection and migraine: a case-control study" (Pinessi L, Savi L, Pellicano R, et al. Headache. 2000;40:836-839)
No full textChronic Helicobacter pylori infection and migraine: a case-control study" (Pinessi L, Savi L, Pellicano R, et al. Headache. 2000;40:836-83
Phytotoxic activity of foliar volatiles and essential oils of Calamintha nepeta (L.) Savi
No full textFoliar volatiles and essential oils of Calamintha nepeta (L.) Savi, a Mediterranean plant species belonging to the Labiatae family, were investigated for their phytotoxic activities on seed germination and root growth of crops (Lactuca sativa L. and Raphanus sativus L.) and weed species (Lolium perenne L. and Amaranthus retroflexus L.). Foliar volatiles of C. nepeta (L.) Savi strongly inhibited both germination and root growth of lettuce, and its essential oils, especially at 125, 250 and 500μL/L, inhibited both processes in lettuce, radish and A. retroflexus L. species, while displaying a little effect on L. perenne L. By GC-MS, 28 chemicals were identified: 17 monoterpenes, 8 sesquiterpenes, 1 diterpene and 2 miscellaneous. Pulegone was the main constituent of the C. nepeta (L.) Savi essential oils. The terpenic components of essentials oils were probably responsible for the phytotoxic activities
Calamintha nepeta (L.) Savi and its Main Essential Oil Constituent Pulegone: Biological Activities and Chemistry
Full text linkMedicinal plants play an important role in the treatment of a wide range of diseases, even if their chemical constituents are not always completely recognized. Observations on their use and efficacy significantly contribute to the disclosure of their therapeutic properties. Calamintha nepeta (L.) Savi is an aromatic herb with a mint-oregano flavor, used in the Mediterranean areas as a traditional medicine. It has an extensive range of biological activities, including antimicrobial, antioxidant and anti-inflammatory, as well as anti-ulcer and insecticidal properties. This study aims to review the scientific findings and research reported to date on Calamintha nepeta (L.) Savi that prove many of the remarkable various biological actions, effects and some uses of this species as a source of bioactive natural compounds. On the other hand, pulegone, the major chemical constituent of Calamintha nepeta (L.) Savi essential oil, has been reported to exhibit numerous bioactivities in cells and animals. Thus, this integrated overview also surveys and interprets the present knowledge of chemistry and analysis of this oxygenated monoterpene, as well as its beneficial bioactivities. Areas for future research are suggeste
COMPOSITION OF THE ESSENTIAL OILS OF CALAMINTHA NEPETA (L.) SAVI SUBSP. NEPETA AND CALAMINTHA NEPETA (L.) SAVI SUBSP. GLANDULOSA (REQ.) P.W. BALL
No full textCalamintha Miller (Lamiaceae) is represented in Turkey by 9 species and 13 taxa, 6 being endemic. The rate of endemism in Turkey is over 45%. In the present study, aerial parts of the Calamintha nepeta (L.) Savi subsp. nepeta were collected from the regions of Tarsus (A), Silifke (B), Bart (C) and Calamintha nepeta (L.) Savi subsp. glandulosa (Req.) P.W. Ball collected from the regions of the Zonguldak (D) and Manisa (E). Water distilled essential oils from the aerial parts of Calamintha species from Turkey were analysed by GC and GC/MS. Trans-piperitone oxide (44.4 %) and piperitenone oxide (11.7 %) were detected as main constituents in sample A; Pulegone (11.9 %), menthone (11.9 %) and carvacrol (10.0 %) were found as main constituents in sample B; Trans-piperitone oxide ( 30.9 %), caryophyllene oxide (7.8 %) were detected as main constituents in sample C; Pulegone (19.5 %), menthone (9.7 %), caryophyllene oxide (7.9 %) and trans-piperitone oxide (5.7 %) were detected as main constituents in sample D; Trans-piperitone oxide (34.2 %), limonene (17.3 %) and piperitenone oxide (10.8 %) were found as main constituents in sample E
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
Essential oils of Calamintha nepeta (L.) Savi and Mentha aff. suaveolens Ehrh.;grown in cordoba, argentina
No full textAs a part of our research on aromatic plants from Córdoba, Argentina (1–4), we have examined the oil composition of the leaves of Calamintha nepeta(L.) Savi and Mentha off. suaveolens Ehrh.;grown in Argentina, using GC and GC/MS. The major constituents of die leaf oil of Calamintha nepeta were pulegone (34.28%), neomenthol (30.61%) and menthone (17.12%) while that of Mentha off. suaveolens had menthol (48.32%), pulegone (20.27%) and menthone (8.90%) as the major components. © 1996, Taylor & Francis Group, LLC. All rights reserved
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
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