1,720,971 research outputs found
Preliminary Studies on the Synthesis and Antimicrobial activity of TiO2/Ag/Au nanoparticles on materials for sanitation of indoor Ambient Assisted Living environments.
No full textPreliminary Studies on the Synthesis and Antimicrobial activity of TiO2/Ag/Au nanoparticles on materials for sanitation of indoor Ambient Assisted Living environments.
Ramadori A. T. a,b Galassi R.,a Micozzi, D.,c Pucciarelli, S. c
a School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino; e-mail: [email protected]
b Fellow from T.R.A.S.P.A.R.E.N:T.E project
c School of Biology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino;
Infectious diseases contracted in the home environment are still a significant problem in the western world due to the excessive use of antibiotics, the occurrence of bacterial resistance and not always correct behavior of the population; prevention and personal hygiene are able to dramatically reduce the risk of transmission, but in some circumstances, for example in the case of older people not fully self-sufficient, long-term care in hospitals and residential health and social environments, which are overcrowded and poorly ventilated, normal personal and domestic hygiene measures may be insufficient.1 Hence, in the development of new technology for the improvement of the sanitation of environments and objects, the use of nanoparticle (NP) systems2 based on Au, Ag and TiO2 NPs was taken into consideration as additives in plasters, resins for water-based paints and varnishes. TiO2 has been purchased, while different Au and Ag NPs syntheses have been perfomed.3 The NPs have been characterized by spectroscopic methods such as UV-vis or IR spectroscopy. Different formulations and concentrations of NPs have been attempted. The obtained samples were tested to evaluate their antimicrobial activity on pathogenic coltures.
References:
1) a) Bruce, N.; Perez-Padilla, R.; Albalak, R. Bull.World Health Org. 2000, 78, 1078-1092. b) Gandara, A.; Mota, L. C.; Gibbs S. G. Environ. Health Perspective 2006, 114, 1859-1864.
2) Ashavani, K.; Praveen, K. V.; Pulickel, M. A.; George, J. Nature Materials 2008, doi:10.1038/nmat2099.
3) a) Wojtysiak, S.; Kudelski, A. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2012, 410, 45-51. b) Rohiman, A., Anshori, I., Surawijaya, A., Idris, I. AIP Conf. Proc. 2011, 1415, 39-42. c) Cubillana-Aguilera, L.M.; Franco-Romano, M.; Gil, M.L.A.; Naranjo-Rodríguez, I.; Hidalgo-Hidalgo de Cisneros, J. L.; Palacios-Santander, J.M. Ultrasonics Sonochemistry, 2011, 18, 789-794
Antioxidant Properties of Donkey Milk
No full textIn the present work the well-known beneficial donkey’s milk (DM)
characteristics to human health have been investigated, focusing
the attention on anti-oxidant properties. For this purpose, vitamin
C, lactoferrin, lactoperoxidase activity and total antioxidant power
(PAO) were determined on milk whereas the reactive oxygen
metabolites (ROM) and PAO concentrations were evaluated on
blood. The trial was carried out on 10 pluriparous jennets. Sterile
blood and milk samples were collected during three different periods
of lactation. Microbiological tests, SCC (by a fluoro-optoelettronic
method), PAO and ROM determinations were performed
by commercial kits. Quantitative determination of lactoferrin from
DM was determined by an HPLC method, lactoperoxidase activity
was evaluated by a continuous spectrophotometric method, vitamin
C content determination was performed using a commercial
kit. The obtained data were subjected to the analysis of variance
(ANOVA, SPSS). Mean values of the investigated param -
eters±standard errors were calculated. No significant differences
were observed for ROM, SCC and neither blood or milk PAO
(respectively, 4.45±0.1 mmol/L; 50.9±19.9¥103/mL; 166.2±4.1 and
55.5±3.2 μmol HClO/mL). The fresh DM contains 57 mg/L of vitamin
C, similar to that of human milk but higher compared with
that of cow’s milk. The lactoferrin concentration in DM is
0.080±0.0035 g/L, very close to that obtained for mare, bovine but
lower if compared with human milk. Mature DM contains low but
detectable LPO activity (0.11±0.027 mg/L) similarly to value
obtained from human milk. Concluding, for the first time were
determined the PAO and ROM reference range in DM, furthermore
the high content of vitamin C in DM confirms the important
nutritional characteristics of this product
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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