1,720,964 research outputs found
Direct measurement of ultrasonic activity on microbial metabolism and analysis of related uncertainty
Get PDFThe scope of this work is to identify the relation that exists between the alterations of the bacterial metabolism and the exposition to an ultrasonic field (O'Leary et al. 1997, Piyasena et al. 2003, Brujan2004). To made this relation quantifiable they will be used repeatable and reproducible metrological methods. To obtain this result the research will be centred on 3 specific goal: 1. To realise a measurement of the ultrasonic field, generated by an ultrasonic bath, using an hydrophone calibrated specifically with the wavelengths applied (Canney et al. 2008). 2. To choose a method, through uncertainty evaluation, to expose microbes to the ultrasonic field without an excessive alteration of the generated acoustic pressure. 3. To find a method to measure bacterial viability, represented by the planktonic growth and the biofilm development, after exposure to the ultrasounds. Studying the relationship between the bacteria metabolism and ultrasonic exposure it will be possible to identify novels and more precise methods to treat bacterial colonizations. This result will be in fact useful in various fields where the bacterial presence, and in particular biofilm development, is today an unresolved problem. At the same time this research will put the basis for many further studies that will be realized applying the same methods with different bacterial species, ultrasounds exposition conditions or ultrasonic device
Probing depth in periodontal pockets: In vitro evaluation of contributions to variability due to probe type and operator skill
No full textPeriodontal probing aims at detecting the presence, type and gravity of periodontal diseases influencing distance between gingival margin and connective ligament. Measurements in vivo are affected by substantial uncertainty, owing, for example, to probe features, anatomic variations and operator’s skill. Inadequate reproducibility in periodontal probing may lead to diagnostic mistakes and inappropriate therapeutic decisions. In vitro evaluation of reproducibility of measurements of periodontal pockets was aimed at while developing a Periodontal Calibration Box designed to calibrate periodontal probe operators, catering also for simulating contraction observed in vivo. Probe type and clinical experience of operators were found to affect substantially probing errors
Black hairy tongue in a patient with amyotrophic lateral sclerosis
Get PDFBlack hairy tongue (BHT) is a condition characterized by the elongation of filiform papillae associated with a marked
discoloration, from yellowish‐brown to black, and a thick lingual coating. BHT is usually observed in the elderly and in
patients with limited self‐sufficiency, as a consequence of poor oral hygiene. In this perspective, the patients affected by
amyotrophic lateral sclerosis (ALS) represent a high‐risk category for the occurrence of BHT. The fast and inexorable
loss of their self‐sufficiency due to progressive muscle atrophy as well as the impropriate education of healthcare
assistants have demonstrated to have significant reflection on the maintenance of an adequate standard of oral hygiene.
This paper firstly described a case of BHT in a patient affected by ALS. A case of BHT in a patient (Caucasic, male,
63 years old) affected by ALS was described. The primary goal of the work was to teach and motivate the patient to
the use of the tongue cleaner in association with the local application of chlorexidine 0.20%. Furthermore, in order
to support the patient with accurate domiciliary oral hygiene, a proper training for his health‐care assistant was
provided. The maintenance of the oral health of ALS patient is fundamental to prevent systemic complications that
could jeopardize the already fragile physical balance of these patients. The dedicated monitoring by a dentist or a dental
hygienist would seem essential in order to achieve this objective
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
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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