1,720,984 research outputs found
L’approccio molecolare per la caratterizzazione di comunità microbiche in manufatti artistici
No full textApplicazioni biomolecolari per la caratterizzazione di comunità batteriche deteriogene in opere d’arte di natura organica e inorganica
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Biotecnologie per la caratterizzazione di aerosol biologici nelle biblioteche
No full textBiodeterioration of organic substrates is a process involving several types of micro/organisms and represents a ravelled problem particularly for confined environments (archives, libraries, hypogeal, museum), where microbial growth depends on a combination of factors such as relative humidity, indoor temperature fluctuation, water activity, chemical and physical properties of materials surface (Else et al., 2003; Gallo et al., 1999; Valentin, 2003). Both water condensation phenomena and poor ventilation, that allow micro-climate formation suitable for the development of microorganisms for fungi and bacteria that may release toxins with human health damaging proprieties, that may persist in the environment (Singh et al., 1995; Peltola et al., 2001). Studies on microbial communities structure in indoor environment reported an high contamination of bacteria such as Bacillus, Micrococcus, Streptomyces, Actinomycetes, among fungi as Penicillum, Cladosporium, Aspergillus, Alternaria, Trichoderma, Rhizopus, (Valentin, 2003).
It is well known that ribosomal RNA genes are essential for all organisms, representing ideal loci for microbial characterization, for phylogenic study and for strains differentiation even within species (Cardinale et al., 2004; Gonzales, 2003). In this study we report a new sampling method and microbial identification strategies, based on PCR and microarray analysis, that can identify bacterial and fungal as biodeteriogens for works of art and/or pathogens for human, focalising our attention on microbial populations, present in the bioaerosol and on works of art surface
Il gene con homeobox P1Hbox12 è coinvolto nella specificazione dell’endo-mesoderma dell’embrione di riccio di mare Paracentrotus lividus
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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
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