1,721,013 research outputs found
Angiotensin converting enzyme inhibitor (CEI) restores renal functional reserve (RFR) in patients with mild heart failure (HF)
No full text
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
Azoto
Full text link1. Introduzione p. 282
2. Determinazione dell’azoto totale con analizzatore elementare p. 284
3. Determinazione dell’azoto totale con metodo semi-micro-Kjeldahl p. 284
4. Determinazione dell’azoto totale con metodo semi-micro-Kjeldahl modificato p. 287
5. Determinazione dell’azoto totale estraibile con soluzione salina con metodo micro-Kjeldahl p. 291
6. Determinazione dell’azoto totale estraibile con soluzione salina con metodo micro-Kjeldahl modificato p.294
7. Determinazione colorimetrica degli ioni ammonio estraibili p. 296
8. Determinazione colorimetrica degli ioni nitrato estraibili p. 298
9. Estrazione dell’azoto totale idrolizzabile con acido cloridrico p. 300 10.Determinazione dell’azoto totale idrolizzabile con acido cloridrico secondo il metodo micro-Kjeldahl p. 30
Interaction between a recombinant prion protein and organo-mineral complexes as evidenced by CPMAS 13C-NMR
No full textPrion proteins (PrP) are the main responsible for Transmissible Spongiform Encephalopathies (TSE). The TSE
etiological agent is a misfolded form of the normal cellular prion protein. The amyloidal aggregates accumulated
in the brain of infected animals and mainly composed of PrPSc exhibit resistance to protease attack and many
conventional inactivating procedures.
The prion protein diseases cause an environmental issue because the environment and in particular the soil
compartment can be contaminated and then become a potential reservoir and diffuser of TSEs infectivity as
a consequence of (i) accidental dispersion from storage plants of meat and bone meal, (ii) incorporation of
contaminated material in fertilizers, (iii) possible natural contamination of pasture soils by grazing herds, and (v)
burial of carcasses.
The environmental problem can be even more relevant because very low amounts of PrPSc are able to propagate
the disease. Several studies evidenced that infectious prion protein remains active in soils for years. Contaminated
soils result, thus, a possible critical route of TSE transmission in wild animals.
Soil can also protect prion protein toward degradation processes due to the presence of humic substances and
inorganic components such as clays. Mineral and organic colloids and the more common association between clay
minerals and humic substances can contribute to the adsorption/entrapment of molecules and macromolecules.
The polymerization of organic monomeric humic precursors occurring in soil in the presence of oxidative enzymes
or manganese and iron oxides, is considered one of the most important processes contributing to the formation of
humic substances. The process is very fast and produces a population of polymeric products of different molecular
structures, sizes, shapes and complexity. Other molecules and possibly biomacromolecules such as proteins may
be involved.
The aim of the present work was to study by CPMAS 13C-NMR the interactions between a non pathogenic ovine
recombinant prion protein and a model soil system represented by a manganese oxide in the form of birnessite
(-MnO2), coated with a polymerized catechol. To better understand the effect of the polymerization process, PrP
was added to the birnessite-cathecol system either before or after the polymerization processes.
The NMR spectra of the prion protein interacting directly with birnessite revealed disappearance of the signals
due to the paramagnetic nature of manganese oxide or abiotic degradation. Conversely, the signal pattern of the
protein re-appeared as it is mixed to the soil-like system either during or after the catechol polymerization process.
Results suggested that the possible interactions of the prion protein on soil systems can be mediated by natural
organic matter. However, deeper studies on more complex real soil systems are needed to definitely confirm such
hypothesis
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
- …
