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Examination of changes in the body composition of lactating does by X-ray computerised tomography
No full textIn vivo estimation of changes in body fat content of lactating rabbit does using X-ray computer tomography.
No full textNon-invasive study of changes in body composition in rabbits during pregnancy using X-ray computerized tomography
No full textThe objectives of this study were: 1 ) to follow changes in body composition during
pregnancy using a non-invasive method; 2) to compare the results obtained with X-ray computerized
tomography (CT) and with the slaughter method; and 3) to study the influence of litter size on
changes in body reserves in pregnant does. Seventeen pregnant Pannon White rabbit does were
examined by means of CT on the day of insemination, on days 14, 21 and 28 of pregnancy, and a few
hours after parturition. At comparable time points, non-pregnant does (n = 26) were also scanned as
a control group. During the CT procedure 27 images (scans) were taken from all of the animals in the
body region from the scapular arch to the femoral-tibial articulation. The scans were processed by
means of the computerized imaging technique, to obtain three-dimensional (3D) histograms that
represented the changes in the water content, and in the fat and muscle tissues of the does. On the day
after parturition all the does were slaughtered and the fat content of their empty bodies was subjected
to chemical analysis. In the first 14 days of pregnancy little change was detected in body
composition. Thereafter, in the abdominal region a marked increase was noted in densities corresponding
to water and water-rich tissues, in correspondence with the growth of uterine contents.
From day 21 of pregnancy a decrease in fat was noted in the pregnant does and an increase in the same
reserves in the non-pregnant control group. To compare the fat content of animals in different physiological
states so-termed fat indices were created by relating pixels corresponding to fat densities to
the total number of pixels. In the same way muscle indices were created to demonstrate the changes
in the muscle reserves during the experimental period. To test the accuracy of estimation by fat
indices a regression analysis was carried out between the index numbers and the fat content subjected
to chemical analysis. The result of this analysis showed a high correlation between the parameters examined. The same fat indices demonstrated a higher mobilisation of body reserves in does
with higher litter size than in those with smaller litters
Changes of the fatty acid composition and malondialdehyde concentration in rabbit Longissimus dorsi muscle after regular electrical stimulation
No full textThe experiment was carried out to investigate, whether in vivo transcutaneous electrical nerve stimulation (TENS) affects the fatty acid composition and antioxidant status of rabbit Longissimus dorsi muscle. Altogether 20 Pannon White meat type rabbits were divided into two groups, from which one was routinely exposed to TENS treatment with the following settings: 2 events (each 20 min) a day/50 days, 1 channel (2 electrodes)/animal, 30 Hz, 20 mus impulse length and 10 mA. The control group was not treated. After slaughtering gas chromatography analysis of the Muscle showed significantly decreased stearic, arachidonic and docosahexaenoic acid proportions, while the estimated activity of the elongase enzyme decreased. The malondialdehyde concentration decreased insignificantly in the treated group, however, it followed the changes of the total highly unsaturated fatty acid amount (three or more double bonds), which decreased from 9.16% to 7.81%. The adaptation to the in vivo electrical treatment may significantly influence the meat fatty acid profile, especially PUFA proportion
Reversibility of the changes of rabbit muscle fatty acid profile
No full textReversibility of the muscle fatty acid profile in rabbit was studied using two dietary fat supplementations. Thirty 4-week-old rabbits were fed a diet with 4% hydrogenated sunflower oil (SAT) for 4 weeks, which was changed to one with 4% sunflower oil (UNSAT) for a further 4 weeks. The reverse UNSAT-SAT feeding plan was also performed on another 30 rabbits. Muscle Longissimus dorsi and blood samples were taken at 4, 5 and 8 weeks. Muscle fatty acid incorporation and reversibility were demonstratcd. The SAT-UNSAT and UNSAT-SAT groups differed only in palmitic and linoleic acids at the end of the trial. Plasma cholesterol was temporarily decreased by changing the diet to UNSAT
Reversibility of the changes of rabbit muscle fatty acid profile induced by consecutive feeding of diets with saturated or unsaturated fatty acid profile
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
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