1,720,970 research outputs found
Il sistema calpaina/calpastatina in 3 muscoli dell’arto pelvico di struzzo African Black. Studio istochimico, immunoistochimico e morfometrico.
No full textScopo di questo lavoro è stato fornire una descrizione dettagliata di tre muscoli dell’arto pelvico di struzzo African Black, analizzare le loro caratteristiche istochimiche e morfometriche, e esaminare l’attività del sistema calpaina/calpastatina attraverso l’utilizzo di metodiche immunoistochimiche
Relationship between morphometric characteristics of fibre types and adipocytes in Cinta Senese pig.
No full textThe research was carried out on 16 pigs of autochthonous (located breed of pig) genetic type Cinta Senese. The
morphometric characteristics of the fibre types and their percentage were determined on Longissimus Dorsi (LD) and Psoas
major (PM) muscles. The area, diameter, volume and thickness of adipocytes from internal and external layers of adipose
tissue from pig backfat, shoulder, dorsal and loin regions were determined. Maximum shortening velocity and isometric
tension were measured in single muscle fibres. The type slow twitch oxidative fibres (SO) was larger than fast twitch
glycolytic fibres (FG) and fast twitch oxidative glycolytic fibres (FOG) (PB0.001), LD muscle was characterised by fibres
larger than PM and males had fibres larger than females. As regards adipocytes the dorsal region had bigger adipocytes (PB
0.050.001) and fat thickness, adipocyte diameter and volume were higher in the middle layer. Isometric tension values were
higher in the fibres type FOG, the values of maximum shortening velocity were higher in the fibres type FG
New insights into muscle fiber types in Casertana pig
No full textLittle is known about the Casertana pig. The aim of this study was to evaluate the effect of sex on histochemical and morphometrical characteristics of muscle fibres (myocytes) in this pure breed and to verify the presence of giant fibres as well as vascularity of the muscle. Finally, maximum shortening velocity and isometric tension were measured in single muscle fibres. Sixteen Casertana pigs (8 males, 8 females) from a farm in Campania (Italy) were slaughtered at one year of age. Muscle tissues were obtained from psoas minor, rhomboideus and longissimus dorsi. Myofibres were stained for myosin adenosine triphosphatase, succinic dehydrogenase, and α-amylase-periodic acid schiff. For all fibre types, the area and perimeter were measured. Slowtwitch oxidative fibres, fast-twitch glycolytic fibres and fast-twitch oxidative-glycolytic fibres were histochemically differentiated; an image-analyzing system was used. The results showed significant differences between the sexes in the size of all three fibre types. The psoas minor muscle had a high percentage of slow-twitch oxidative fibres and contained more capillaries per fibre and per mm2 than rhomboideus and longissimus dorsi, in which fast-twitch glycolytic fibres dominated. The cross-sectional area of all fibre types was larger in longissimus dorsi than in rhomboideus and psoas minor muscles; the giant fibres were present in the longissimus dorsi muscle only. Besides, isometric tension values were higher in fast-twitch glycolytic fibres than in the other ones. Variations in fibre type composition may contribute to meat quality
Propolis effect on the fish’s muscular development and Histomorphometrical characteristics
No full textThe aim of our study was to evaluate the effect of propolis on mortality of fish eggs due to mycosis, to study its efficacy on the fish growth rate and to analyze the histochemical and ultrastructural characteristics of muscle fibres. We evaluated the muscular development of fish in two different experimental conditions: traditional feeding and feeding with addition of propolis (groups A and B, respectively). The study was carried out on two species of teleosts bred in Italy, Oncorhynchus mykiss (rainbow trout) and Salmo trutta (brown trout). The use of propolis reduced mortality of fish eggs. The muscles were stained for myosin ATPase and succinic dehydrogenase to evaluate fibre type. The area, maximum and minimum diameter for each fibre type in relation to the body length were measured. The animals fed propolis showed a more rapid muscular growth compared to control fed the standard diet. Fibres were larger in the Salmo trutta than in the Oncorhynchus mykiss in both groups. In fish of A group, myotomal muscle, the presence of giant fibres and index of environmental stress was noticed. This type of study is valuable in order to extend the use of propolis as an antifungal agent and a natural product that can improve fish farming
Post-mortem analysis in three muscles of Red Neck Ostrich (Struthio Camelus Massaicus)
No full textA description of the pelvic limb musculature of ostrich (Red Neck) is given. Muscle tissues were obtained from muscle
iliotibialis lateralis pars preacetabularis, muscle femorotibialis medius and muscle fibularis longus. The histochemical
results revealed the presence of two types of fibres: slow-twitch fibres (type I) and fast-twitch intermediate fibres (type
IIA). A higher incidence of type I compared to type IIA fibres in muscle iliotibialis lateralis pars preacetabularis and muscle
femorotibialis medius was noticed. The immunohistochemical results revealed that in this species calpain/calpastatin system
was localized in various parts of the muscles, although μ-calpain and m-calpain totally disappeared at 4 days post-mortem.
Calpastatin and p-94 were present during all the period considered (0, 2 days, 4 days and 6 days post-mortem). In this study
changes in enzymatic activities of μ and m-calpain were observed, particularly the activity of μ and m-calpain decrease
rapidly during post mortem storage
Histomorphometrical and comparative analysis of three muscles of buffalo (Bubalus bubalis)
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
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