1,720,966 research outputs found
A label-free electrochemical biosensor based on screen-printed electrodes modified with gold nanoparticles for quick detection of bacterial pathogens
Full text linkIn this study, carbon screen-printed electrodes (SPEs) modified with gold nanoparticles (AuNPs), were prepared for label-free detection of Escherichia coli(E. coli) O157. AuNPs were synthesized by an electrochemical method and then modified on the carbon SPEs to improve the stability and effectiveness of the biosensor. Anti-E. coli O157 antibody was immobilized on the modified SPEs via -NHS cross-linking. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were selected to investigate electrochemical properties of modified carbon SPEs in a 5.0 mM K3[Fe(CN)6]/ K4[Fe(CN)6] added with 0.1 M KCl as well as to detect E. coli O157 bacteria. Results showed that the carbon SPEs were successfully modified with AuNPs of 18.0 ± 1.6 nm. The electrochemical signal of modified SPEs was stable after CV cycles, and the charge transfer resistance (Rct) decreased approximately to half of its initial value. Importantly, electrochemical biosensors based on AuNPs-modified carbon SPEs could detect E. coli O157 in the range of 10–106 CFU/mL without labels. The limit of detection was found at 15 CFU/mL with a signal-to-noise ratio of 3:1, and the time of detection was about 30 min. The success of as-prepared biosensor could open a strategy of portable diagnostics for label-free and quick detection of bacterial pathogens causing food-borne diseases, hospital-acquired infections as well as the emerging and re-emerging infectious diseases
Lifestyle Factors and Health Related Quality of Life in Vietnamese Women After Cancer
No full textBackground: A range of lifestyle factors and health related quality of life (HRQoL) influence cancer survivors' health, wellbeing, and survival. Some women who have received treatment of breast and gynecologic cancer (BCG) report lifestyle practices and HRQoL at lower levels than the general community. However, the impacts of factors such as socio-demographic characteristics and health status on lifestyle factors and HRQoL, and the interactions between these variables in terms of their influence on HRQoL are not fully understood. Aim: This study aimed to provide a comprehensive understanding of the relationships between lifestyle factors and HRQoL and to identify the socio-demographic factors, health status, and behavioral determinants of these variables among Vietnamese women following treatment of BGC. Methods: A cross-sectional study design was used. Data were collected from 330 Vietnamese women who had received treatment of BCG using both online and paper-based methods. Descriptive statistics, bivariate and multivariate statistics were used to examine associations and structural equational modeling was used to identify the interactions between the study's variables. Results: Although the majority of the study participants had a normal range of BMI (n=260, 81.2%) with the mean BMI was 22.02 (SD=2.52), engagement in a range of healthy lifestyle behaviors was low at. More than 75% of the study participants had a deficit in physical health and mental health compared with the norms. Participants' cancer-specific HRQoL score was 80.61 (SD= 15.81) which is lower than that of normal population (85.9). Sleep impairment had a significant indirect effect on mental health (indirect effect= -.030, P < .05) and cancer-specific HRQoL (indirect effect= -.017, P < .05). Exercise self-efficacy significantly and indirectly influenced mental health (indirect effect= .022, P < .05). Conclusion: This study highlights that there are deficits in the HRQoL of Vietnamese women following BGC and they had lower than recommended levels of engagement in healthy lifestyle behaviors. Participants also had high levels of sleep impairment and low levels of self-efficacy to follow a healthy diet or exercise. The indirect effects identified in this study indicate that health care professionals should provide information and community support focused on improving HRQoL and improving sleep impairment and self-efficacy.No Full Tex
Travel desire over intention in pandemic times
Full text linkHighlights
• Travel Intention was critically complicated by numerous factors linked to COVID-19.
• We empirically validate Travel Intention, Craving and Vaccine Confidence.
• Travel Intention, unlike Travel Craving, has no relationship with Vaccine Confidence.
• We discuss implications for theory and marketing and communication strategies
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
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
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