1,721,015 research outputs found
CCDC 1475150: Experimental Crystal Structure Determination
No full textRelated Article: Boyang Mao, David G. Calatayud, Vincenzo Mirabello, Navaratnarajah Kuganathan, Haobo Ge, Robert M. J. Jacobs, Ashley M. Shepherd, José A. Ribeiro Martins, Jorge Bernardino De La Serna, Benjamin J. Hodges, Stanley W. Botchway, Sofia I. Pascu|2017|Chem.-Eur.J.|23|9772|doi:10.1002/chem.20160523
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
Characteristics of DNA damage induced by ultrasoft X-rays and upon photoionization.
No full textThe initial indiscriminate damage of ionizing radiation on DNA in cells arises through direct energy deposition in DNA (non scavengeable component) or through water radicals (scavengeable component) together as clustered lesions. The non scavengeable component of damage leads to electron loss (and electron gain through electron migration) centres. In solution, it is usually difficult to separate the two components due to overwhelming water radicals. Evidence is presented (chapter 3), for clean production of mainly electron loss centres in DNA and base constituents at room temperature in solution, achieved by 193 nm pulsed high intensity laser light through a monophotonic ionization. Quantitative information on the role of the oxidative damage has been presented. Efficient migration of oxidative damage was found to occur over 2-3 bases from the generation site at adenine, thymine and cytosine to final localisation at guanine. The oxidative damage transfer appeared to be hindered when occurring between adenine and cytosine to guanine. Changes in light scattering intensities of polynucleotides and DNA indicated strand break formation upon a pulse of 193 nm laser light (chapter 4). Comparison of the transient optical absorption of the polynucleotides and DNA showed similar kinetics, indicating that strand breakage is initiated at the base radical cation and probably at guanine. It is proposed that the abundant cationic radical species in DNA is inefficient in causing strand break, but adds to the complexity of clustered damage by ionizing radiation through formation of base damage. Therefore strand break arise predominantly from OH radical attack and direct energy deposition on sugar-phosphate. The use of radiation which produces specific energy deposition events within DNA is imperative to extend our understanding of the effects of ionizing irradiation in biological systems. Characteristic aluminium K (A1K) (energy of 1.5 keV) and copper L (Cu L) (energy of ~0.95 keV) ultrasoft X-rays (USX) have been used as a probe for low energy electrons of track end structure for low LET ionizing radiation (chapter 5). Cellular inactivation, DNA dsb induction and their repair in Chinese hamster V79-4 cells as monolayer have been studied under aerobic and anaerobic conditions. Relative to 60Co y-rays, the relative biological effectiveness (r.b.e.) for cellular inactivation is 1.7 0.1 and 2.4 0.3 for A1 K and Cu L USX respectively. The oxygen enhancement ratio (OER) of 1.9 for A1 K USX is less than that for 60Co y-rays. DNA dsb induction by A1K and Cu L USX at 277 K, determined using the sensitive pulsed field gel electrophoresis technique is linear with dose, with r.b.e values of 2.6 0.2 and 2.8 0.3 for A1K and Cu L USX respectively. A reduced OER (of 2.1) was found for A1K USX. The repair kinetics for rejoining of DNA dsb following an irradiation dose of 15 Gy is similar for both USX and 60Co y-rays and has half-life of 22 5 min. The scavengeable component of damage ascribed to hydroxyl radicals for both 60Co y-rays and A1 K ultra-soft X-ray was investigated using 0.5 mol dm-3 ethylene glycol (EG) (chapter 6), showed a protection against cell inactivation to the same extent for both A1 K USX and 60Co y-rays. EG also reduced the number of DNA dsb measured by ~40%. It is confirmed that USX are more effective in both cell killing and the induction of DNA dsb than typical low-LET irradiation. From the findings with EG, dsb rejoining and the RBE values, it is inferred that the dsbs are similar in complexity for both radiation qualities. From the use of USX as a probe of track structure, it is inferred that cellular inactivation and DNA dsb break induction by 60Co y irradiation reflects clustered damage from predominantly track-end events which represents about 30% of the total dose. Although there are some minor differences, with 60Co y irradiation a distribution of severity of damage is expected including low energy electrons with energies greater than that of either Cu L- and A1 K-USX. USX are therefore an effective probe but not an exact model for the track-end clustered damage produced in low LET irradiations
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
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
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
Investigating Protein–Protein Interactions in the Plant Endomembrane System Using Multiphoton-Induced FRET-FLIM
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