1,720,961 research outputs found
Plasminogen activation system in milk from Friesian and Jersey cows: relationships with milk production and composition
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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
Effect of recombinant bovine somatotropin and calcium salts of long-chain fatty acids on milk from Italian buffalo
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Distribution of plasminogen activator forms in different fractions of buffalo milk
No full textIn Italy buffalo milk is an important animal product utilized solely for the manufacture of Mozzarella cheese. Of an estimated population of 200000 buffalo there are ∼25000 controlled animals. The average milk production, expressed over 270 d lactation, is 2000 kg/head with average fat and protein contents of 82·6 and 46·4 g/l respectively (Associazione Italiana Allevatori, 1996). In recent years there has been a steady increase in the number of dairy buffalo replacing dairy cows as a consequence of the European Union quota system.
The cheesemaking qualities of milk depend on many factors, the most important of which are the concentrations of intact casein and fat. Milk in which casein has been broken down by proteolytic enzymes is of less value to cheese manufacturers (Lucey & Kelly, 1994). Plasmin (EC 3.4.21.7), the most important endogenous milk proteinase, occurs in milk together with its inactive proenzyme, plasminogen (Schaar & Funke, 1986). Plasmin hydrolyses αs-casein and β-casein, although κ-casein has been reported to be resistant (Fox, 1981). However, Andrews & Alichanidis (1983) found κ-casein to be hydrolysed quite rapidly by plasmin. Plasmin activity is higher in mastitic than normal milk (Bastian & Brown, 1996). Stage of lactation affects plasmin activity: late lactation is associated with higher concentrations of plasmin (Gilmore et al. 1995; Baldi et al. 1996). Thus, plasmin could be a major problem in herds with seasonal breeding such as buffalo, which progress through lactation in synchrony and are therefore at a similar stage of lactation at a given time.
The cascade of reactions leading to plasminogen activation is regulated by a complex network of molecular interactions between plasminogen activators (PA; EC 3.4.21.31) and at least three types of specific PA inhibitors (PAI-1; PAI-2; PAI-3; Saksela, 1985; Politis, 1996). There are two types of highly specific PA: tissue-PA (t-PA) and urokinase-PA (u-PA) (Saksela & Rifkin, 1988). PA activity is higher in mastitic than normal milk (Heegaard et al. 1994a). However, previous studies on PA in milk were carried out on bovine and caprine milk. No information is available on the presence and type of PA in buffalo milk. Thus the objective of the present study was to determine the level and type of PA in different fractions of buffalo milk: casein, serum, and somatic cells
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
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