1,720,955 research outputs found
Hybrid MII-organic-diphosphate hydrates (MII = Mn, Ni and Zn): Structural characterization, hirshfeld surface analysis and antitumoral activity
No full textThree inorganic-organic hybrid diphosphates, templated by transition metal (2,6- (CH3)2C6H3NH3)2[MII(H2P2O7)2(H2O)2] (MII 1⁄4Mn, Ni, Zn), were successfully synthesized by low speed of evaporation conditions after using the ion exchange chemical procedure. Their crystal structures were solved from single-crystal X-ray diffraction data. All compounds are isotypic and crystallize in the triclinic system with space group Pı. The crystal structure is built from the alternatively arranged inorganic [MII(H2P2O7)2(H2O)2]2- anions and organic [(CH3)2C6H3NH3]þ cations, stabilized by OeH/O and N eH/O hydrogen bonds and p$p stacking. The complexes were investigated by using such techniques: IR, TGA/DTA, UVevisible characterization techniques (Ni(II), Mn(II) compounds) and 1H, 13C, 31P NMR (Zn(II) compound). Hirshfeld surface analyses of the studied salts were also carried out. Finally, in vitro anticancer activities of compounds were further determined with reference to three human cancer cell lines (Human cervical (A431), pancreatic (PSN1) and human ovarian cell lines (2008)). Hybrid complexes, based on manganese, nickel and zinc, displayed in vitro efficient antitumor activity compared with the positive reference drug cisplatin
Hybrid MII-organic-diphosphate hydrates (MII = Mn, Ni and Zn): Structural characterization, hirshfeld surface analysis and antitumoral activity
No full textThree inorganic-organic hybrid diphosphates, templated by transition metal (2,6- (CH3)2C6H3NH3)2[MII(H2P2O7)2(H2O)2] (MII 1⁄4Mn, Ni, Zn), were successfully synthesized by low speed of evaporation conditions after using the ion exchange chemical procedure. Their crystal structures were solved from single-crystal X-ray diffraction data. All compounds are isotypic and crystallize in the triclinic system with space group Pı. The crystal structure is built from the alternatively arranged inorganic [MII(H2P2O7)2(H2O)2]2- anions and organic [(CH3)2C6H3NH3]þ cations, stabilized by OeH/O and N eH/O hydrogen bonds and p$p stacking. The complexes were investigated by using such techniques: IR, TGA/DTA, UVevisible characterization techniques (Ni(II), Mn(II) compounds) and 1H, 13C, 31P NMR (Zn(II) compound). Hirshfeld surface analyses of the studied salts were also carried out. Finally, in vitro anticancer activities of compounds were further determined with reference to three human cancer cell lines (Human cervical (A431), pancreatic (PSN1) and human ovarian cell lines (2008)). Hybrid complexes, based on manganese, nickel and zinc, displayed in vitro efficient antitumor activity compared with the positive reference drug cisplatin
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
"Shake 'n Bake" Route to Functionalized Zr-UiO-66 Metal-Organic Frameworks
Get PDFWe report a novel synthetic procedure for the high-yield synthesis of metal-organic frameworks (MOFs) with fcu topology with a UiO-66-like structure starting from a range of commercial ZrIV precursors and various substituted dicarboxylic linkers. The syntheses are carried out by grinding in a ball mill the starting reagents, namely, Zr salts and the dicarboxylic linkers, in the presence of a small amount of acetic acid and water (1 mL total volume for 1 mmol of each reagent), followed by incubation at either room temperature or 120 °C. Such a simple "shake 'n bake"procedure, inspired by the solid-state reaction of inorganic materials, such as oxides, avoids the use of large amounts of solvents generally used for the syntheses of Zr-MOF. Acidity of the linkers and the amount of water are found to be crucial factors in affording materials of quality comparable to that of products obtained under solvo- or hydrothermal conditions
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
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