1,721,068 research outputs found
Aliphatic hydrocarbon and sterol content of zooplankton of the emilia-romagna coast (northern adriatic)
No full text1. Aliphatic hydrocarbons () and sterols were isolated from zooplankton of the northern Adriatic Sea.
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2. The composition was determined using gas-liquid chromatography and mass-spectrometry methods.
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3. The aliphatic hydrocarbons were represented, mainly, by a monoolefine with 17 carbon atoms accompanied by noticeable amounts of .
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4. In the sterol fraction cholesterol was shown to be the main component with appreciable quantities of 22-deydrocholesterol, 5α-cholestan-3β-ol, 24-methyl-27-norcholesta-5,22-dien-3β-ol and 24-methyl-cholesta-5,24(28)-dien-3β-ol
Hydrocarbons, sterols and fatty acids in sea urchin (Paracentrotus lividus) of the Adriatic Sea
No full textAliphatic hydrocarbons, linear alkylbenzenes (LABs), sterols and fatty acids were determined in sea urchins (Paracentrotus lividus) of the Adriatic Sea in order to study their relationship with the trophic chain. The prevailing aliphatic hydrocarbons were squalene (40.3%) and n-C17:1 (24.9%), both of recent biological origin. LABS, on the other hand, are considered tracers of domestic wastes in marine environment. Among sterols, cholesterol (73.5%) and other Δ5-sterols are dominant, Fatty acids 16:0 (20.0%), 20:5ω3 (12.2%) and 14:0 (7.6%) were prevalent here as they are in other echinoid species analyzed by other authors. The distribution of these different compounds seems to be influenced by factors such as physiological needs, available diet and anthropogenic contamination
Effetti della salinità su risposte immunitarie della vongola Chamelea gallina (L. 1758).
No full textIn the present study, the effects of differing salinities on immune responses of the clam, Chamelea gallina (L., 1758), were investigated. The animals were kept for 7 days at 28, 34 (control) and 40‰, and total haemocyte count (THC), phagocytic and lysozyme activities were measured. Results show that salinity values far from 34‰ affects significantly functional responses of C. gallina haemocytes
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
Effetti di elementi traccia (Fe, Zn, Cu) in esemplari di orata (Sparus aurata) alimentati con diete sperimentali
No full textAppropriate 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
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