1,721,001 research outputs found
Dehydroepiandrosterone sulfate concentrations in claws from dogs from birth to 60 days of age.
No full textBecause of the limited knowledge on dog perinatology and due
to the known usefulness of claws as a non-invasive matrix for long-term retrospective
hormone accumulation investigations (1, 2), this study aimed to
assess possible changes of dehydroepiandrosterone sulfate (DHEA-S) concentrations,
the major fetal steroid, in newborn puppy-claws and to evaluate
the possible effect of some maternal and neonatal parameters on DHEA-S
claw accumulation. Methods: The study was performed on 60 largely purebred
viable, normal and healthy puppies. Tip claws were individually collec -
ted by trimming at birth and after regrowth at 30 and 60 days of age. Pooled
individual claws were stored at room temperature until analysis by RIA.
Possible effects of maternal age and parity, type of parturition, litter size,
and newborn gender were statistically assessed. Results: The mean ± SD
DHEA-S claw-concentration decreased significantly (p < 0.001) from birth
(209 ± 148.00 pg/mg) to 30 days (94 ± 45.85 pg/mg) and further to 60 days
(60 ± 74.02 pg/mg) of age. Claw-DHEA-S values at birth were somewhat
higher, but with a lower SD, in comparison to data reported for 1–3 weeks
old human babies (1). No influence of maternal age and parity, type of parturition,
litter size, and newborn gender was found. The trend of a decrease
is in agreement with data reported for cortisol in dead puppies (2), and suggests,
beside the role of cortisol, the important effects of DHEA-S around
the time of birth, also in puppies, as reported for human babies (1).
1. Tegethoff et al. Biological Psychology 2011; 87: 414–420.
2. Veronesi et al. Theriogenology 2015; 84: 791–796
Recovery rate and recovery time in cows with luteal and follicular ovarian cysts after treatment with buserelin
No full textCortisol fetal fluids concentrations and newborn outcome in term pregnancy Chihuahua dogs: preliminary results.
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
Influence of season on testicular morphometry and semen characteristic in Martina Franca jackasses
No full textAs other European donkey breeds, Martina Franca could be considered an endangered breed because of the population number (48 jackasses and 515 jennies in 2011). To increase donkey population and breed biodiversity preservation, several research projects on donkey reproduction have been performed; however reproductive seasonality has been only partially investigated in jackasses. For this reason the aim of this study was to investigate the effect of seasons and of long (spring to summer; SS) and short (autumn to winter; AW) day length periods, on reproductive physiology of Martina Franca jackasses, in particular on: (1) testicular morphometric characteristics, (2) behavior, through the evaluation of the reaction time, and finally, (3) semen characteristics. Seven adult and reproductively mature Martina Franca jackasses were enrolled. For each jackass, a morphometric evaluation of both testes was performed once for every season, before the first seasonal collection. Semen was collected, by artificial vagina, weekly for a whole year (52 collections per donkey); at each collection the reaction time was recorded and a complete semen evaluation was performed immediately after collection. No differences in testicular measures were observed neither between left and right testis nor during the four seasons. A lower reaction time was observed in spring and summer compared with autumn and winter and during the period SS compared with AW. Total volume was significantly higher in winter compared with all the other seasons; gel-free volume was higher in winter compared with summer and autumn. Mean sperm concentration was significantly lower in winter compared with spring and summer and in AW compared with SS. Total and progressive motility and membrane integrity did not show any significant difference between season and between SS and AW. A lower average path velocity was observed in autumn compared with spring and summer, and in summer a higher straight line velocity compared with spring and autumn, and a lower curvilinear velocity compared with winter were found. No differences in amplitude of lateral head displacement, beat cross frequency, straightness and linearity were observed neither between seasons nor in SS versus AW. Seminal pH did not show any seasonal difference; also sperm morphology did not show any significant difference during the whole year. This study demonstrated that under our climatic and management conditions Martina Franca donkey stallions do not show significant differences in testicular morphometric characteristics during the year, even if a certain seasonal influence exists on reaction time and some seminal parameters. Considering the variable temperature and photoperiod during the four seasons where the study was performed, this lack of substantial differences could be related to a characteristic of the Martina Franca breed.[...
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