1,720,958 research outputs found
STUDIES OF VIRULENCE FACTORS OF ESCHERICHIA COLI ISOLATED FROM COWS WITH ACUTE MASTITIS.
No full textCOMPORTAMENTO IMMUNOLOGICO DELLE BOVINE GRAVIDE VACCINATE CON K 99 DI E.COLI E DEI RISPETTIVI VITELLI.
No full text45 pregnant cows were vaccinated with enterotoxigenic Escherichia coli K 99+. Blood samples, colostrum and milk from cows and sera from calves were collected. The different classes of specific antibodies against K 99 antigen of enterotoxigenic Escherichia coli were evaluated by the microplate enzyme linked immunosorbent test (ELISA).
The total protein content in the sera of cows and calves was determined.
The serum immunoglobulin levels showed a significant rise in the vaccinated cows; the calves, 7 days after colostrum consumption, showed a diminished concentration of albumine while the gammaglobulines were increased.
The antibody class most represented was IgG1, IgA were, as expected, in a high concentration in the colostrum.
In spite of the high antibody titers in the pregnant cows the immunoglobulin levels in calves may some times remain low and therefore cannot guarantee protection.
Campioni di colostro, latte e sangue sono stati raccoIti da 45 bovine gravide vaccinate con l'antigene K 99 di Escherichia coli; successivamente dai vitelli sono stati prelevati in tempi diversi 2 campioni di sangue.
I campioni sono stati utilizzati per determinare la quantità di proteine totali e individuare le diverse classi di immunoglobuline, mediante il metodo ELISA, utilizzando anticorpi policlonali e monoclonali.
I livelli immunoglobulinici erano alti nelle bovine vaccinate e nei vitelli alla nascita, mentre questi ultimi a 7 giorni di età presentavano una accentuata diminuzione.
La classe di immunoglobuline più rappresentate era la IgG1.
Malgrado l'alta concentrazione di anticorpi nelle bovine gravide i livelli immunoglobulinici nei vitelli possono tal volta rimanere bassi e non garantire uno stato di protezione
CARATTERI Dl VIRULENZA DI E.COLI ISOLATI DA BOVINE CON MASTITE ACUTA.
No full textEscherichia coli isolated from udder with acute mastitis were identified biochemically and serologically. The bacteria were then tested for mannose haemagglutination, enterotoxin production, serum resistance and invasivness, characteristics normally associated with Escherichia coli isolated from calves with enteric syndromes. Escherichia coli from the udder were serologically heterogeneous group without the characteristics that are usually correlated with Escherichia coli of intestinal origin
VACCINATION OF PREGNANT COWS WITH K 99 ANTIGEN OF ENTEROTOXI GENIC ESCHERICHIA COLI AND PROTECTION BY COLOSTRUM IN NEWBORN CALVES.
No full textPleuropolmonite fibrinosa e rinite atrofica del suino: proprietà immunogena di un vaccino spento
No full text
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
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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