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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
Beneficial effects of iodoprophilaxis on ovine reproduction
No full textSome area of Abruzzo are characterized by severe iodine deficiency and by high prevalence of iodine deficient disorders. The adverse effects of iodine deficiency are also present in farm animals, compromising local economy. In the present study, granted by the Ministero della Sanità, we attempted to: a) monitor sheep iodine intake in different sheep breeding farms distributed in the Abruzzo territory; b) monitor the effects of iodoprophylaxis on animal reproductive capacity. Eleven breeding farms, with a total of 56 animals, were examined. By measuring urinary iodine concentration (UIC), acceptable levels of iodine intake were present in animals bred in 3 farms, with a mean UIC 300 g/L; animals bred in 3 farms showed a mean UIC between 100-150 g/L, while values of UIC 50 g/L were observed in animals bred in the remaining 5 farms. In one of the farms, with low value of UIC, subcutaneous injections of 1 ml of Lipiodol were done in male and female animals. This single injection was able to maintain UIC well above 300 g/L for at least 3 months. After 6 months reproductive capacity were assessed by monitoring the rate of successful mating, compared to that of untreated animals. To this end, lipidiol-treated and untreated females were mated for 5 days with lipiodol treated and untreated males, respectively. Successful mating were evaluated by monitoring, 1 month later, the presence of embryos by ecographic analysis. The results showed that about 90% of treated females mated with treated males were pregnant while only 37% of the control females mated with control males were pregnant. In conclusion, the results of this study demonstrate that iodoprophylaxis improves ovine reproductive capacity. This may improve local economy and may also be beneficial for human iodoprophylaxis in the region
Behavour during the oestrus cycle of the Martina Franca donkey, ovarian ultrasonography and endocrine aspect
No full textBeaviour during the oestrous cycle of the Martina Franca donkey, ovarian Ultrasonography and endocrine aspect
No full textRiproduzione ovina in aree iodocarenti: effetti della iodoprofilassi
No full textNella regione Abruzzo sono presenti aree caratterizzate da iodocarenza e da elevata incidenza di patologie dovute all’insufficiente apporto di iodio (M. Olivieri et al. Atti VI Giorn. It. Tiroide 114, 1988). In questo contesto anche gli animali di interesse zootecnico possono essere suscettibili agli effetti negativi della iodocarenza. In particolare, alterazioni dello sviluppo sessuale potrebbero associarsi ad una ridotta capacità riproduttiva (E.A. Jannini et al. Endocr. Rev. 16:443, 1995). A tal fine gli obiettivi del presente studio, finanziato dal Ministero della Sanità (Ricerca Finalizzata 1998), sono stati: a) monitorare l’apporto alimentare di iodio in differenti allevamenti ovini distribuiti sul territorio abruzzese tramite la determinazione della ioduria; b) valutare le capacità riproduttive di animali sottoposti o meno ad un adeguato programma di iodoprofilassi. Nella prima fase dello studio l’apporto di iodio è stato valutato, in 11 differenti allevamenti ovini per un totale di 56 animali, mediante la determinazione della concentrazione di iodio urinario con metodo colorimetrico basato sulla reazione di Sandell-Kolthoff, dopo digestione dei campioni di urine con acido clorico. I risultati hanno evidenziato un apporto ottimale di iodio soltanto in 3 allevamenti (ioduria 300 g/L). In 3 allevamenti si è riscontrato un apporto di iodio discreto (ioduria 100-150 g/L) mentre in 5 allevamenti i livelli di iodio urinario erano decisamente insufficienti (ioduria 300 g/L per almeno 3 mesi. Dopo 6 mesi dall’inizio del trattamento sono stati valutati gli effetti della iodoprofilassi sulle capacità riproduttive. A tal fine le femmine di controllo e quelle trattate sono state sottoposte a sincronizzazione degli estri mediante apposizione intravaginale di pessari contenenti 40 mg di Fluorgesterone acetato e somministrazione intramuscolo di PGF2(250 g). Dopo 10 giorni le femmine trattate e quelle di controllo sono state messe in accoppiamento rispettivamente con maschi trattati o di controllo. Il successo degli accoppiamenti è stato valutato dopo 40-60 giorni accertando lo stato di gravidanza mediante ecografia. I risultati hanno dimostrato un aumento statisticamente significativo (p=0.007) della fertilità degli animali trattati rispetto ai controlli. In particolare, si è evidenziato come solo il 37% delle femmine di controllo accoppiate con maschi di controllo siano rimaste gravide, rispetto al 100% delle femmine trattate accoppiate con maschi trattati. Tale aumentata capacità riproduttiva è associata ad una più efficiente gametogenesi sia maschile che femminile, come evidenziato dall’analisi istologica delle gonadi.
In conclusione, nel presente studio si è dimostrato come il deficitario apporto iodico in animali di interesse zootecnico possa essere ripristinato con un programma di iodoprofilassi basato sulla somministrazione di iodio per via parenterale. Tale trattamento oltre ad essere efficace nell’aumentare le capacità riproduttive degli animali può rivelarsi estremamente utile per la iodoprofilassi silente nell’uomo che si nutrirebbe di carni, latte e derivati a più elevato contenuto di iodio
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
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