3,062 research outputs found
Podosirus Bellan-Santini 2007
No full textPodosirus Bellan-Santini, 2007 Podosirus Bellan-Santini, 2007: 569. Type species. Podosirus spinosa Bellan-Santini, 2007 (lapsus calamus), Podosirus vaderi Bellan-Santini, 2007 selected here. Included species. Podosirus includes 1 species: P. vaderi Bellan-Santini, 2007. Diagnosis. With the characters of the family. Remarks. Bellan-Santini (2007) originally designated P. spinosa as the type species of Podosirus. She has since indicated (in litt.) that she intended the type species to be P. v a d e r i. Distribution. Lucky Strike site, Mid-Atlantic Ridge, North Atlantic Ocean.Published as part of Myers, A, 2012, Podosiridae, a new family of North Atlantic deep sea amphipod (Crustacea, Amphipoda), pp. 81-84 in Zootaxa 3546 on page 84, DOI: 10.5281/zenodo.21079
Hegel e le scienze sociali
No full textGli studi raccolti in "Hegel e le scienze sociali" propongono una reciproca correzione e integrazione tra la prospettiva filosofica hegeliana e gli snodi cruciali della teoria sociale contemporanea. Le categorie critico-dialettiche, a lungo viste dalla sociologia marxista come il guscio mistico che imprigionava il pensiero e la prassi sociale, acquistano un nuovo significato e finanche una nuova valenza metodologico-euristica.
Teoria del riconoscimento, pensiero critico-dialettico, teoria dello spirito oggettivo rivivono nell’ottica di un confronto dialogico con autori, momenti, crocevia della teorizzazione sociologica, senza quelle pretese di conclusività, integrazione sistemica e conciliazione che potevano aver illuso lo Hegel sistematico.
Saggi di A. Bellan, V. Hoesle, C. Kantner/U. Tietz, F. Neuhouser, M. Quante/D. Schweikard, P. Redding, G. Rose, A. Sartori, I. Testa
Stephonyx carinatus Bellan-Santini 1997
No full text<i>Stephonyx carinatus</i> Bellan-Santini, 1997 <p> <i>Stephonyx carinatus</i> Bellan-Santini, 1997: 13, figs 7, 8.— Ortiz <i>et al.</i>, 2007: 516.— Diffenthal & Horton, 2007: 39 (key).— Senna & Serejo, 2007: 13 (key).— Narahara <i>et al.</i>, 2012: 1505 (key).</p> <p> <b>Types.</b> Holotype, 7 mm, MNHN-Am 4903.</p> <p> <b>Type locality.</b> Barbados Trench, North Atlantic Ocean (10°19.97’N 58°37.30’W), 1947 m depth.</p> <p> <b>Habitat.</b> Marine, cold seeps.</p> <p> <b>Depth range.</b> 1947 m (Bellan-Santini 1997).</p> <p> <b>Distribution.</b> <i>North Atlantic Ocean</i>. Barbados trench (Bellan-Santini 1997).</p>Published as part of <i>Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), pp. 1-92 in Zootaxa 3867 (1)</i> on page 67, DOI: 10.11646/zootaxa.3867.1.1, <a href="http://zenodo.org/record/5585734">http://zenodo.org/record/5585734</a>
Podosirus vaderi Bellan-Santini 2007, n. sp.
No full text<i>Podosirus vaderi</i> n. sp. <p>(Figures 1, 2)</p> <p> <i>Type locality.</i> Mid-Atlantic Ridge, 37 <i>°</i> 17.398 <i>9</i> N, 32 <i>°</i> 16.642 <i>9</i> W, Lucky Strike site, 1680 m.</p> <p> <i>Material examined.</i> SEAHMA 1, PL 187-09, 12 August 2002, slurp gun 5, Lucky Strike site, 1680 m, 4 specimens: 1 female with oostegites, holotype MNHN Am-7463; 3 exemplaries of 6, 4 and 4 mm, paratypes MNHN Am-7464.</p> <p> <i>Description.</i> Holotype female 5 mm, with oostegites. Body slender, compressed, last segment of mesosome with a small dorsal process. Segments 1–3 of metasome with a small dorsal process. Segments of urosome each one with a dorsal process small and triangular. Rostrum moderate, lateral cephalic lobe ordinary. Eyes not visible. Antennae flagellum broken. Antenna 1, peduncle articles 1 and 2 of equal length; article 1 with a long dorsodistal process, article 3 small, primary flagellum more than 13-articulate, accessory flagellum absent. Antenna 2 slender, articles 4 and 5 equal, flagellum more than 10- articulate. Labrum entire, rounded.</p> <p>Mandible with normal triturative molar, incisor sharply dentate, palp long, article 1 short, articles 2 and 3 equal in length, article 3 fringed with small spines on the distal half of the inner side, long sub-terminal spine. Maxilla 1 inner plate small with two small terminal spines, outer plate with seven broad spines. Maxilla 2 inner plate shorter than outer, eight terminal and sub-terminal setae, outer plate with nine terminal setae. Maxilliped inner plate short with two terminal triangular spines and two or three setae, outer plate with small facial spines, two terminal setae, palp with four articles, second longer than 1 and 3, article 4 longer than 3 and smooth.</p> <p>Coxae 1–4 small, anteriorly produced as a sharp process. Gnathopod 1 smaller than gnathopod 2, subchelate, basis long, ischium and merus short, carpus as long as propodus, fringed with setae, propodus ovate, palmar fringed with small spines and defined by a larger spine, dactylus half of propodus. Gnathopod 2 large, basis long with two anterior crests ending distally with a small rounded process, ischium crested, merus produced, carpus triangular, propodus longer than broad, palm indented in a finger shape, proximal part with small spines and defined by three larger spines, dactylus long as two-thirds of the propodus.</p> <p>Pereopods 3 and 4 similar, basis straight and long, ischium short, merus long as basis, fringed on both sides by small spines, carpus shorter than merus and propodus, propodus curved and humped in the proximal part, dactylus half length of propodus, claw-shaped.</p> <p>Pereopods 5–7 similar, basis not lobate but little more broad than pereopods 3 and 4, other articles similar to pereopods 3 and 4.</p> <p>Epimeral plates 1–3 similar, rounded.</p> <p>Uropod 1, peduncle equal to sub-equal rami, each ramus fringed with scarce small spines. Uropod 2, outer ramus scarcely shorter than inner. Uropod 3 not expanded beyond uropods 1 and 2, rami lanceolate equal to peduncle, peduncle fringed with small spines. Telson entire, ovate, two pairs of sub-terminal spinules.</p> <p> <i>Etymology.</i> The species is named in honour of Wim Vader for his important and friendly contribution to ‘‘amphipodology’’.</p>Published as part of <i>Bellan-Santini, Denise, 2007, New amphipods of hydrothermal vent environments on the Mid-Atlantic Ridge, Azores Triple junction zone, pp. 567-596 in Journal of Natural History 41 (9 - 12)</i> on page 572, DOI: 10.1080/00222930701262537, <a href="http://zenodo.org/record/4669830">http://zenodo.org/record/4669830</a>
New insights on low vitamin D plasma concentration as a potential cardiovascular risk factor
No full textThe role of Vitamin D hormone in human health and disease is still debated. Recently, growing attention has been paid to its putative role in cardiovascular system homeostasis with several studies that suggested a correlation between low vitamin D levels and increased cardiovascular risk. Several mechanisms are involved in the development of cardiovascular diseases: systemic inflammation, endothelial dysfunction, arterial hypertension and insulin resistance. In the present paper, we have revised the current literature supporting a role for vitamin D in the development of these pathogenetic processes. Finally, we have evaluated the current evidence linking vitamin D to atherosclerosis and its natural consequence, cardiovascular diseases
Oediceropsis bicornuta Bellan-Santini 2007, n. sp.
No full text<i>Oediceropsis bicornuta</i> n. sp. <p>(Figures 9–12)</p> <p> <i>Type locality.</i> Mid-Atlantic Ridge, Lucky Strike (Tour Eiffel), 37 <i>°</i> 17.32 <i>9</i> N, 32 <i>°</i> 16.51 <i>9</i> W, 1686 m.</p> <p> <i>Material examined.</i> DIVA 2 cruise (particle trap triple 4 June 1994 – 1 July 1994, 1.5 m of the bottom), foot of black smoker. Tour Eiffel, 1686 m, 1 female holotype MNHN-Am 7469.</p> <p> <i>Diagnosis.</i> Antenna 1 short, accessory flagellum absent. Antenna 2 shorter than half of body length, peduncle article 5 with a long antero-distal curved spine, each article of the flagellum with a plumose seta and a calceolus. Eyes absent. Telson normal.</p> <p> <i>Description.</i> Holotype female with oostegites, 16 mm. Head is equal to the two first segments of the mesosome. Body smooth. Eyes absent. Rostrum short, as long as lateral cephalic lobe. Lateral cephalic lobe quadrate. Antenna 1 reaching the end of article 4 of the peduncle of antenna 2; article 1 robust with single setae on the superior edge and plumose setae at the inferior edge; article 2 equal to 0.6 of article 1, setose; article 3 equal to half of article 2; accessory flagellum absent, flagellum 13-articulate. Antenna 2 shorter than half of body length, peduncle article 5 with a long curved antero-distal spine, as long as the eight first articles of the flagellum, and a posterior spine less long and straight; flagellum 67- articulate bearing at the inferior edge of each article a plumose seta and a calceolus. Mandible with incisor process denticulate, molar columnar, palp triarticulate, first article short and smooth; article 2 slightly curved and fringed with many short setae, one long subterminal seta; article 3 fringed with a single row of short setae, three long distal setae. Maxilla 1 inner plate rounded, fringed on the inner edge by five plumose setae, outer plate with seven bidentate spines, palp biarticulate, article 1 setose on the external edge, article 2 setose on the external edge and at the distal part of the inner edge. Maxilla 2 both plates equal and hardly setose. Maxilliped inner and outer plates setose on the inner edge, palp four-articulate, article 2 enlarged in the medial part, article 3 wide distally, article 4 falcate.</p> <p>Coxa 1 enlarged distally, distal edge fringed with numerous setae. Coxa 2, subrectangular, distal edge slightly shorter, rounded and fringed with numerous setae. Coxa 3 rectangular, distal edge setose, coxa 4 not excavate posteriorly, only concave, distal edge and half posterior edge setose.</p> <p>Gnathopods subchelate. Gnathopod 1 basis fringed on both edges, ischium and merus short; carpus lobate, as long as wide, lobe not extending along the propodus; propodus enlarged length/breadth ratio 7:5, palm rounded, fringed with numerous short setae, delimited by a spine; dactylus curved, as long as palm. Gnathopod 2 basis fringed on the anterior edge; ischium and merus short; carpus lobate, lobe setose; propodus ovate, palm rounded, delimited by a spine, dactylus curved, long as palm. Pereopods 3 and 4 basis setose on both edges, merus distally enlarged, dactylus long. Pereopod 5 basis slightly lobate, strongly setose on both edges, merus ovate, fringed by long plumose setae on posterior edge and distal anterior one, dactylus long and blade shaped. Pereopod 6 basis proximally lobate, fringed on both edges by long setae; merus ovate, fringed with long setose seta on the posterior edge and simple setae on the anterior edge; dactylus seveneighths length of propodus and blade-shaped. Pereopod 7 elongate, basis slightly lobate, fringed on both edges by long setae, plumose setae on the lobe; ischium short, merus/ carpus/propodus/dactylus ratio 10:12:9.5:10, all articles fringed on both edges by robust setae.</p> <p>Epimeral plate 3 rounded, fringed with short setae. Uropod 1 peduncle long and spinose, equal rami spinose, peduncle/rami ratio 13:8. Uropod 2 peduncle long and spinose, peduncle/rami ratio 9:8. Uropod 3 lost. Telson entire, as long as wide, distally excaved, fringed with small setae on the sides, two pairs of little distal setae.</p> <p> <i>Remarks.</i> The calceoli of antenna 2 of this species have an original shape. Lincoln and Hurley (1981) have given good descriptions of the different types of calceoli. They describe nine structural types for different families. They consider that for eusirid, gammarellid and oedicerotid types, the calceoli are ‘‘immediately distinguished … from other calceoli’’ by ‘‘the distinct separation of the proximal and distal elements and the remarkable cup-shaped configuration of the former’’. In <i>Oediceropsis bicornuta</i>, a membrane with two acute tips envelops the fluted proximal parabolic element, the distal element is saucer shaped with a ridged plate interiorly.</p> <p> <i>Relationship.</i> In the Oedicerotidae, the genus <i>Oediceropsis</i> is characterized by the buccal structure; rostrum small or absent; gnathopods similar to one another, subchelate; articles 4 and 5 of antenna 2 with several very large or elongated and curved spines. Three species of <i>Oediceropsis</i> have been described; <i>O. brevicornis</i> Lilljeborg, 1865; <i>O. elsula</i> Barnard, 1966 and <i>O. proxima</i> Chevreux, 1908. <i>Oediceropsis bicornuta</i> is distinguished from <i>O. brevicornis</i> by absence of eyes, size of antenna 1 reaching the end of article 4 of antenna 2, absence of hump in the coxa 4 and the telson distally excaved; from <i>O. elsula</i> by size of rostrum, shape of gnathopod 1 carpus and propodus, absence of posterior hump in the coxa 4, shape of telson. <i>Oediceropsis proxima</i> considered as very near to <i>O. brevicornis</i> has a short description, but coxa 4 is expanded posteriorly with a sharp upturned point; in <i>Oediceropsis bicornuta</i> the posterior edge of coxa 4 has only a small distal hump without point; the propodus of gnathopod 1 in <i>O. proxima</i> is longer than wide as gnathopod 2, in <i>O. bicornuta</i> the propodus of gnathopod 1 is as long as wide; the first two pereopods of <i>O. proxima</i> have the dactylus longer than propodus, in <i>O. bicornuta</i> dactylus/propodus have a ratio 2: 2.6 in pereopod 3 and 2: 2.3 in pereopod 4. The telson of <i>Oediceropsis proxima</i> has a crenulated distal margin not excavated as in <i>O. bicornuta; O. proxima</i> has no calceoli on antenna 2.</p> <p> <i>Distribution and habitat.</i> Mid-Atlantic Ridge, central Atlantic Ocean.</p> <p> <i>Etymology.</i> The name is suggested by the special shape of the membrane enveloping the proximal element of the calceoli.</p>Published as part of <i>Bellan-Santini, Denise, 2007, New amphipods of hydrothermal vent environments on the Mid-Atlantic Ridge, Azores Triple junction zone, pp. 567-596 in Journal of Natural History 41 (9 - 12)</i> on pages 579-584, DOI: 10.1080/00222930701262537, <a href="http://zenodo.org/record/4669830">http://zenodo.org/record/4669830</a>
Heavy Flavours Production in DIS Events at HERA
No full textThe estimation of the fraction of events in which an heavy quark is produced in the deeply inelastic electron–proton collisions is the measurement performed in the present analysis. The analysed data sample corresponds to about 130 pb-1 collected during the years 2004-2005 by the ZEUS detector, located in one of the interaction points of the HERA collider in Hamburg.
The measured percentages are directly related to the proton structure, formally encoded by the contribution of the heavy quarks to the structure functions F2.
The tagging of the events in which an heavy quark is produced is achieved by means of the Impact Parameter method. The correlation between the lifetime of the hadrons and the geometrical properties of the relative tracks makes possible
to pick out the heavy flavours production form the background.
This kind of ’topological’ method makes an extensive use of the silicon Micro Vertex Detector (MVD). This essential component of the tracking suite of the ZEUS detector has been the major upgrade realized in the second half of the ZEUS experiment data taking period. The achievement of the physical goal has strongly leaned on its performance and reliability, so a considerable part of the work consisted in feasibility, refinement and optimization studies
Reply to comment by R. L. Lysak on “Improved basis set for low frequency plasma waves”
No full textIn a Comment, R. L. Lysak argues against the validity of Bellan (2012) on the grounds that this paper uses fluid rather than kinetic theory. The Comment invokes a commonly used method for reducing the 3×3 wave equation matrix to a 2×2 matrix which then gives approximate dispersion relations. In this Response, it is shown that the same 3×3 wave equation matrix can be obtained from fluid theory and certain mathematical inconsistencies in the method of analysis used in the Comment are identified. It is shown that the dispersion relation derived in Bellan (2012) provides a much better description of the experimental observations reported by Kletzing et al. (2003) than does the dispersion relation proposed in the Comment and in Lysak and Lotko (1996)
Orgogliosi di essere mammiferi. Quanto conta il confine tra uomo e animale?
No full textNel saggio discuto l'antispecismo difeso da Alessandro Bellan nei suoi scritti sull'etica animale. Dopo aver avanzato dei dubbi sulla consistenza logica della prospettiva antispecista, propongo un'alternativa all'antropocentrismo morale basata su una concezione non perfezionista dei vincoli morali
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