1,721,035 research outputs found
“Studio degli aspetti forestali ambientali del Fortore-Tammaro-Titerno e vocazione alla produzione del tartufo in ambiente naturale”
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Leptin effects on testis and epididymis in the lizard Podarcis sicula, during summer regression.
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Leptina e suo recettore nei rettili: un possibile nesso tra riproduzione e adattamento.
No full textIl ciclo stagionale delle riserve energetiche a cui sono sottoposti gli animali ectotermi è finemente regolato ed associato alla riproduzione. La leptina, peptide filogeneticamente conservato potrebbe agire come lipostato, anche se il suo gene non è stato ancora identificato nei rettili.
Nelle gonadi dei rettili è stata messa in evidenza la presenza della leptina e del suo recettore con metodi immunoistochimici usando anticorpi di mammifero.La leptina potrebbe svolgere un ruolo regolativo della gametogenesi nella lucertola Podarcis sicula, così come ipotizzato nei mammiferi
A NEW PERSPECTIVE: AN ITALIAN AUTOCHTHONOUS PIG AND ITS MUSCLE AND FAT TISSUE CHARACTERISTICS
No full textThe research was aimed at identifying the key characteristics of muscle and fat tissues when comparing two pig breeds: Black Sicilian pig and Landrace pig. In Psoas minor (Pm) and Psoas major (PM) muscles the morphometric characteristics of fibre types and their percentage were determined. The area of adipocytes from internal and external layer of adipose tissue was also determined. The results showed that slow twitch oxidative (SO) fibres were larger than fast twitch glycolytic (FG) and fast twitch oxidative glycolytic (FOG); Pm muscle was characterized by larger FG and SO fibres than PM; males had larger fibres than females in both muscles and breeds. Landrace pig has smaller adipocytes cells than Black Sicilian while Black Sicilian pig showed more essential fatty acids than Landrace. The results in favour of Black Sicilian pig show how conservation of animal biodiversity becomes important because of the high independent homeostatic capability exhibited by autochthonous genetic types for the management and control of the land
Innervation of the vas deferens and accessory male genital glands in the water buffalo (Bubalus bubalis). Neurochemical characteristics and relationships to the reproductive activity.
No full textAutonomic nerves supplying mammalian male internal genital organs have an important role in the regulation of reproductive function. To ®nd out the relationships between the neurochemical content of these nerves and the reproductive activity, we performed a histochemical and immunohistochem- ical study in a species, the water buffalo, exhibiting a seasonal sexual behaviour. The distribution of noradrenergic and nitric oxide synthase (NOS)- and peptide-containing nerves was evaluated during the mating and non-mating periods. Fresh segments of vas deferens and accessory genital glands were collected immediately after slaughter and immersed in 4% paraformaldehyde. Frozen sections were obtained and processed according to single and double labelling immuno ̄uorescent procedures or NADPH-diaphorase histochemistry. During the mating period, a dense noradrenergic innervation was observed to supply the vas deferens as well as the accessory genital glands. NOS- and peptide- containing nerves were also observed but with a lower density. During the non-mating period noradrenergic nerves dramatically reduced. In addition, neuropeptide Y (NPY)- and vasoactive intestinal peptide (VIP)-containing nerves were also reduced. These ®ndings suggest the presence of complex interactions between androgen hormones and the autonomic nerve supply in the regulation of male water buffalo reproductive functions
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
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