197,584 research outputs found
Indice dei nomi (a cura di F. C. Abramo, M. Fadini, C. Polli)
No full textIndice dei nomi del volume VIII di «Ticontre» (a cura di Federica Claudia Abramo, Matteo Fadini, Chiara Polli)Indice dei nomi del volume VIII di «Ticontre» (a cura di Federica Claudia Abramo, Matteo Fadini, Chiara Polli)Indice dei nomi del volume VIII di «Ticontre» (a cura di Federica Claudia Abramo, Matteo Fadini, Chiara Polli)Indice dei nomi del volume VIII di «Ticontre» (a cura di Federica Claudia Abramo, Matteo Fadini, Chiara Polli
Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
No full textBlack hake, Merluccius polli and M. senegalensis, are demersal species that inhabit the continental shelf and upper slope off Morocco, Mauritania, and Senegal, and are targeted by Spanish trawlers and bottom longliners. Merluccius senegalensis generally occurs at shallower depths than M. polli, although both species share a wide bathymetric range. Due to their external resemblance and overlapping occurrence at certain depths, both species are mixed in catches and are commonly marketed as Merluccius spp. From 2003 to 2009 biological samplings were performed in Mauritanian waters for numerous specimens of M. polli and M. senegalensis during 15 commercial fishing trips, seven experimental longline surveys, and three trawl surveys carried out within the black hake depth range and mainly during their reproductive periods. Data sets for 1334 fishing stations were thus gathered. The georeferenced macroscopic analysis of the female-assigned maturity stages was combined with the monthly evolution of the gonadosomatic index and with the time series of roe landings from 1984 to 2006 to determine the potential spawning areas, depths, and seasons for both species, showing an intense spawning period from November to February. Size at first maturity was estimated for both species in separate spawning periods and was higher for M. polli females (44 cm) than for M. senegalensis females (39 cm). Sex ratios were also determined by length classes (1 cm) for the experimental survey data and were analyzed according to fishing gear and latitude. The results showed a general predominance of females throughout the depths explored, both for M. polli (1:1.7) and M. senegalensis (1:1.5). Histological samples of ovaries and spawning progression data were jointly analyzed and indicated an apparent spawning delay for the deeper hake, M. polli (October), in comparison with the shallower hake, M. senegalensis (September). </jats:p
BoLA class I polymorphism and in vitro immune response to M. bovis antigens
No full textFrom a sample of 119 Friesian calves, serologically typed for BoLA class I, 47 subjects were chosen expressing 9 different MHC types (A6, A6.9, A10, All, A14, A15, A30, W16, M103) with the same age and reared in the same farm conditions. The animals were s.c. injected with a water in oil suspension of killed M. bovis and the treatment was repeated two days later. Before the treatment and 21 days later, calves were bled and on PBM peripheral blood mononuclear leucocytes) were performed the following tests: 1. Lymphocyte Stimulation with bovine and avian PPDs (Purified protein derivative of Mycobacterium bovis and Mycobacterium, respectively). 2. Phagocytic activity towards M. bovis. 3. Class II molecules expression on cell surface. 4. Percentage of leucocyte populations and subpopulations. In the in vitro Lymphocyte Stimulation test, all the animals and classes were responders. Animals bearing A10 BoLA class I presented c.p.m. (counts per minute) and index values higher than the other cattle; these values were significantly positively related both to bovine and avian PPDs (P < .01). By variance analysis A14 BoLA type showed a slight positive significant correlation with more efficient phagocytic activity. BoLA class I type did not seem to significantly affect percentage of class II positive cells and leucocyte percentages on PBM
Galeus polli Cadenat 1959
No full textGaleus polli Cadenat, 1959 African Sawtail Catshark Galeus polli Cadenat, 1959: 396, figs. 1–4, 7–18. Syntypes: (17, plus young) MNHN 1959-0044; MNHN 1959- 0045. Type locality: off Senegal, West Africa. Local synonymy: Galeus polli: Compagno et al., 2005: 299, fig., pl. 37; Ebert et al., 2013 a: 345, fig., pl. 45; Ebert, 2015: 148, fig. 163; Ebert & Mostada, 2015: 47, fig.; Ebert & van Hees, 2015: 147; Compagno, 2016: 1265, fig.; Weigmann, 2016: 875. South Africa voucher material: Uncatalogued specimens at SAM from the Northern Cape Province, west coast of South Africa. South African distribution: Known from a few specimens collected during research survey cruises south of the Orange River, off the NC, west coast of South Africa (Ebert, 2015). Remarks: The species is most common from about central Namibia northwards, but is less common south of L̹deritz, Namibia, where it is replaced by Holohalaelurus regani and Scyliorhinus capensis (Compagno et al., 1991; Ebert, 2015). Conservation status: LC (2004). Genus Halaelurus Gill, 1862 Tiger Catsharks Halaelurus Gill, 1862: 407. Type species: Scyllium buergeri M̹ller & Henle, 1838c. Type by original designation (also monotypic).Published as part of Ebert, David A., Wintner, Sabine P. & Kyne, Peter M., 2021, An annotated checklist of the chondrichthyans of South Africa, pp. 1-127 in Zootaxa 4947 (1) on page 47, DOI: 10.11646/zootaxa.4947.1.1, http://zenodo.org/record/461456
Screening di base per le malattie genetiche : uno sguardo particolare alla prevenzione delle malattie genetiche del cane e del gatto
No full textAttualità e ricerca sulle patologie della displasia del gomito e sulle problematiche della ricerca del DNA
No full textGenetica, prevenzione e diagnosi molecolare delle nefropatie ereditarie del cane e del gatto
No full textPeripheral neuropathy in macroglobulinemia: incidence and antigen-specificity of M proteins
No full textPeripheral neuropathy was found in 12 (46%) of 26 patients with macroglobulinemia. The neuropathy was subclinical in two. Anti-myelin-associated glycoprotein (MAG) activity was found in six (50%) patients with neuropathy. Sural nerve biopsies showed demyelination and IgM deposits on the myelin sheath. In one patient who had no anti-MAG activity, the serum IgM bound to peripheral myelin by indirect immunofluorescence and to several protein bands in peripheral nerve and other tissues by immunoblot. In the other five patients with neuropathy, we found no binding of M proteins to nerve components, but in three patients there were endoneurial IgM deposits in nerve biopsy. Peripheral neuropathy may be related to the antigen-specificity of M proteins
Distribution of black hakes Merluccius senegalensis and Merluccius polli along the Moroccan Atlantic coast
No full textIn the Northwestern coast of Africa three species of hakes overlap. These include European
hake Merluccius merluccius (Linnaeus, 1758), Senegalese hake Merluccius senegalensis Cadenat, 1950
and Benguela hake Merluccius polli Cadenat, 1950. The Black hakes M. senegalensis and M. polli have
their northern distribution limit in Morocco. In this study, this limit was set to 33.05°N (33° 3' 0" N) for
M. senegalensis and 28.28°N (28° 16' 48") for M. polli. The fluctuation in the northern limit of the black
hakes distribution could be a result of changes in oceanographic parameters (as the area is affected by
the upwelling and considered as a transition zone between a warm and a cold region) or a seasonal
migration of the species. A misidentification of species is not excluded. The general trend of the yield’s
average decreases with latitude. South of the latitude 25°N M. polli is more abundant in average than M.
senegalensis even if the latter could show some high yield spots (up to 155 kg h-1
). North of the latitude
25°N, the situation is inversed. Black hakes were caught up to about 1000 m depth (1055 m for M.
senegalensis, deeper than the ever-reported depth). M. polli showed a deeper distribution than M.
senegalensis and was absent from the strata shallower than 300 m. The main concentration of M. polli
was between 500 and 700 m where 81% of individuals are caught. The main concentration of M.
senegalensis was in the stratum 300-600 m where 77% of individuals are caught. The maximum overlap
of the two black hakes species was between 400 and 600 m suggesting a deeper population in the
northern zone of the distribution of these species. Although M. senegalensis shows a maximum size (73
cm) greater than M. polli’s maximum size (66 cm), its average size in the study area (44.06 cm) was
significantly smaller than M. polli’s average size (48.84 cm). The black hakes are considered as shared
resources and need more studies with a regional scope so as to contribute to their management
Some biological parameters of black hakes Merluccius senegalensis and Merluccius polli in Mauritanian waters
No full textThe black hakes
Merluccius senegalensis
Cadenat 1950 and
Merluccius polli
Cadenat 1950 are
demersal species whose geographical distribution overlaps off Mauritanian waters. Spanish trawling
and longliner fleets catch both species. During 2003 and 2004, 8101 and 2691 specimens of
M. polli
and M
. senegalensis
respectively were sampled biologically in several scientific watching campaigns
onboard of commercial trawling ships and two longline experimental campaigns. From the information
stored, it has been calculated the total length (cm) vs. total weight (g) and total length vs. total gutted
weight relationships by sexes and species, as well as the conversion factor from gutted to total weight.
By means of macrocospic analysis of the gonadic stages and the evolution of the gonadosomatic
indexes (GSI) of both species it has been located the spawning season and zones. The spawning
season extends mainly from November to February with a peak in December-January for both
species, but with quite early in
M. senegalensis
. The males reaches the sexual maturity at lower
lengths than females in both hake species (
34, 3 - 39,2 cm
in
M. polli
and 33,0
-39,2cm
;in
M.
senegalensis
) and females of both species reaches at the same length the first maturity. For the
combined sexes,
M. senegalensis
reach the firsts maturity at slightly lower length (35,4 cm) than
M.
polli
(37,0 cm). Females dominate the sex ratio in the populations of both species. The largest
specimen caught (79,6 cm) corresponded to a female of
M. senegalensis
,aswellastwomalesof
great size for the same specie of (65,7 and 67,5 cm total length)
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