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Chemical constituents and biological activities of two endemic cephalaria species from dipsacaceae
No full textGerçekleştirdiğimiz çalışmada botanik olarak tanımlanan Cephalaria lycica ve Cephalaria cilicica (Dipsacaceae) endemik bitkilerinin kimyasal içerik ve biyolojik özellikleri ilk kez araştırıldı. Bitkilerin toplanma işlemi gerçekleştirildikten sonra söz konusu bitkiler kurutulup, öğütüldü ve sırasıyla MeOH, MeOH:H2O, BuOH:H2O ve Hegzan çözgen ve çözgen karışımlarıyla ekstraksiyonları yapıldı. Elde edilen ekstrelerin antioksidan (DPPH Yöntemi) ve antimikrobiyal (MIC Yöntemi) aktiviteleri tayin edildi. İzolasyon çalışmaları aktivitesi en yüksek fraksiyonlar üzerinde gerçekleştirildi. İzolasyon ve saflandırma çalışmaları sırasında çeşitli kromatografik (VLC, CC, TLC, PLC, MPLC) ve kimyasal yöntemlerden faydalanıldı. Elde edilen saf bileşiklerin yapılarının belirlenmesi için bir seri gelişmiş spektroskopik yöntemden (1D- ve 2D-NMR, Kütle, UV, FT-IR) yararlanıldı. Sonuç olarak, yapılan izolasyon, saflandırma ve yapı tayini çalışmalarında, C. lycica bitkisinden yeni bir iridoid glikozit (bileşik 1) ve yeni bir triterpen glikozit (bileşik 2), C. cilicica bitkisinden de yeni bir triterpen glikozit (bileşik 3) elde edildi
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
Glycosides from Cephalaria Species
No full textThree novel triterpene glycosides (1-3), namely lycicoside I, II and cilicicoside I, were isolated from two different Cephalaria (Dipsacaceae) species along with one known oleanane- and one iridoit-type of glycoside. The structures of these compounds were established as 3-O-[beta-D-glucopyranosyl(1 -> 3)-alpha-L-rhamnopyranosyl(1 -> 4)-beta-D-xylopyranosyl(1 -> 4)-beta-D-xylopyranosyl]-28-O-[beta-D-glucopyranosyl(1 -> 6)-beta-D-glucopyranosyl]-oleanolic acid (1), 3-O-[beta-D-xylopyranosyl(1 -> 3)-alpha-L-rhamnopyranosyl(1 -> 4)-beta-D-xylopyranosyl]-28-O-[beta-D-glucopyranosyl]-oleanolic acid (2) from Cephalaria lyciea Matthew and 3-O-{beta-D-glucopyranosyl(1 -> 4)-beta-D-xylopyranosyl(1 -> 3)-alpha-L-rhamnopyranosyl(1 -> 2)-[beta-D-glucopyranosyl (1 -> 3)] - alpha-L-rhamnopyranosyl}-28-O-[beta-D-glucopyranosyl(1 -> 6)-beta-D-glucopyranosyl]-hederagenin (3) from Cephalaria cilicica Boiss. & Kotschy, on the basis of spectroscopic methods (1D and 2D NMR techniques, mass spectrometry) and chemical evidence. In addition, three new prosapogenins, 1B-3B, were obtained from the basic hydrolysis of 1-3. The antimicrobial activity of 1-3 was tested against some Gram-positive and Gram-negative bacteria strains.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [107 T 028]; EBILTEMEge University [2008 BIL 003]; EUBAP [2009 FEN 044]We thank H. Sumbul and R. S. Gokturk for their valuable assistance in collection and identification of the plant materials. We are also grateful to TUBITAK (107 T 028), EBILTEM (2008 BIL 003) and EUBAP (2009 FEN 044) for financial support and would like to thank TUBITAK for running HRESIMS spectra, EBILTEM for running NMR (400 MHz) spectra and Ege University Faculty of Science Biology Department for ESIMS analyses. We also thank Assoc. Prof. Dr. S. Astley for proof reading the manuscript
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
Glycosides from Cephalaria Species
No full textThree novel triterpene glycosides (1-3), namely lycicoside I, II and cilicicoside I, were isolated from two different Cephalaria (Dipsacaceae) species along with one known oleanane- and one iridoit-type of glycoside. The structures of these compounds were established as 3-O-[beta-D-glucopyranosyl(1 -> 3)-alpha-L-rhamnopyranosyl(1 -> 4)-beta-D-xylopyranosyl(1 -> 4)-beta-D-xylopyranosyl]-28-O-[beta-D-glucopyranosyl(1 -> 6)-beta-D-glucopyranosyl]-oleanolic acid (1), 3-O-[beta-D-xylopyranosyl(1 -> 3)-alpha-L-rhamnopyranosyl(1 -> 4)-beta-D-xylopyranosyl]-28-O-[beta-D-glucopyranosyl]-oleanolic acid (2) from Cephalaria lyciea Matthew and 3-O-{beta-D-glucopyranosyl(1 -> 4)-beta-D-xylopyranosyl(1 -> 3)-alpha-L-rhamnopyranosyl(1 -> 2)-[beta-D-glucopyranosyl (1 -> 3)] - alpha-L-rhamnopyranosyl}-28-O-[beta-D-glucopyranosyl(1 -> 6)-beta-D-glucopyranosyl]-hederagenin (3) from Cephalaria cilicica Boiss. & Kotschy, on the basis of spectroscopic methods (1D and 2D NMR techniques, mass spectrometry) and chemical evidence. In addition, three new prosapogenins, 1B-3B, were obtained from the basic hydrolysis of 1-3. The antimicrobial activity of 1-3 was tested against some Gram-positive and Gram-negative bacteria strains
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
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