1,721,077 research outputs found
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
Epimerase and glycocholic acid hydrolase of Xanthomonas and their use in ursocholic and ursodeoxycholic production
No full textGlyccplic acid Hydrolase and epimerase from Xanthomonas are applied to the synthesis of ursodeoxycholic aci
Procedimento per la preparazione di acido ursocolico con impiego di Xanthomonas malthophilia
No full textviene descritta la epimerizzazione del acido colico all'acido ursocolico attraverso una biocatalisi ossido riduttiva utilizzando un ceppo di Xanthomonas maltophili
Enzimi estraibili da Xanthomonas maltophilia utili per la trasformazione di substrati a struttura colanica
No full textNel brevetto sono descritte le proprietà degli enzimi del metabolismo dei sali biliari di un ceppo di Xanthomonas maltophillia adattato a crescere in ambiente contaminato con bile animale. Con tali enzimi si è proceduto alla messa a punto di una tecnica per la preparazione sterepecifica dell'acido ursodeossicolico
Platinum complexes containing chemically modified bile acids, having antitumor activity.
No full textThe present invention relates to Pt complexes contg. bile acids derivs., I (n = 0, 1; A = C, CHCH), having antitumor activity. For example, I (n = 0, A = C) was prepd. in 84 % yield by the reaction of dehydrochloric acid with L-tartaric acid in several steps to give the triacid which was reacted with [Pt(NH3)2(H2O)2](NO3)2. Pharmaceutical compns. contg. I are claimed
Preparation of a platinum phosphine complex with dehydrocholic acid having antitumor activity.
No full textThe prepn. is described for a platinum(II) complex having antitumor activity, cis-[PtL2(PPh3)2] (HL = dehydrocholic acid). The complex is prepd. from cis-[PtCl2(PPh3)2] and the silver salt of dehydrocholic acid
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
Da maestro Guido a Guido Faba: autobiografismo e lettera d’amore tra la seconda e la terza generazione di dettatori
No full textIl contributo è dedicato ai dettagli biografici dei dettatori e alle lettere sentimentali conservate nei manuali di artes dictandi: analizzando brani epistolografici (alcuni inediti) e contestualizzandoli nel periodo storico in cui sono stati composti, si discute del valore dei testi dittaminali come potenziali fonti storiche
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