1,724,628 research outputs found
Istologia e anatomia microscopica dei mammiferi domestici e degli uccelli - Hans-Georg Liebich - I edizione sulla V tedesca
No full textTesto-Atlante a colori per lo studio e la professione - Edizione Italiana a cura di C. Ballarin e G. Radaell
L'italiano per studiare e per stare a scuola
No full textI processi di insegnamento e di apprendimento che riguardano la lingua che comunica la scienza delle discipline e delle professioni trovano una proposta di definizione – “microlingue scientifico-professionali” – in Balboni (2000: 9), dove è sintetizzato l’ampio confronto scientifico sul tema e dove viene indicata una proposta epistemologica e operativa nell’ambito della glottodidattica. Le microlingue scientifico-professionali sono adottate tra specialisti di un determinato settore, al fine di comunicare in modo univoco e non ambiguo fra loro. In questo ambito occorrono, perciò, specifiche strategie didattiche per insegnare una lingua che gli apprendenti non conoscono, o conoscono in parte, mentre l’insegnante non ha padronanza specialistica nella disciplina non linguistica veicolata dalla lingua (Ballarin 2019). La realtà scolastica e professionale, tuttavia, deve tener conto di situazioni, per così dire “ibride”, in cui né il discente né il docente sono pienamente specialisti in ambito non linguistico. In questo caso occorrono strategie didattiche differenziate (Ballarin 2014, 2018; Cinganotto 2018; Nitti, Ballarin 2020). Un altro ambito specifico è costituito, inoltre, dall’ambiente universitario in cui i discenti hanno una maggiore conoscenza specialistica e hanno la necessità di apprendere la relativa microlingua disciplinare. Questo contributo permette di analizzare alcune delle caratteristiche della lingua italiana, intesa complessivamente come L1, L2, LS, utilizzata tanto per studiare quanto per comunicare all’interno delle agenzie formative
Domitius culsu Ballarin 2020, sp. nov.
No full text<p> <b> <i>Domitius culsu</i> Ballarin sp. nov.</b> </p> <p>Figures 1 A‒G, 2A‒E, 3A‒D.</p> <p> <i>Nesticus speluncarum</i> Brignoli, 1979: 214 (misidentification)</p> <p> <b>Type material. Holotype ♂. ITALY, <i>Toscana</i>: Garfagnana area, Lucca Province, Coreglia Antelminelli Municipality, Tana delle Fate di Coreglia Antelminelli cave, 141/T/LU, 260m a.s.l., 44.046336°N 10.523525°E, 21.VIII.2018, leg. F. Ballarin and D. Avesani (MSNV).</b> <b>Paratypes</b>. Same locality as the holotype, 1♀, 04.IX.1967, leg. A. Vigna Taglianti (MSNV) (Brignoli 1979, sub <i>Nesticus speluncarum</i>); 1♀, 15.VIII.2015, leg. F. Ballarin and M. Gaiga (MSNV); 4♀♀, 24.VI.2017, (3♀♀ collected as juveniles and raised in captivity, adults: 20.VIII.2017, 15.IX.2017 and 28.VI.2018 respec- tively), leg. F. Ballarin and R. Ballarin (MSNV); 4♀♀, 21.VIII.2018, leg. F. Ballarin and D. Avesani (MSNV, MSNB).</p> <p> a New Sequences.</p> <p> <b>Examined comparative material. <i>Domitius speluncarum</i> (Pavesi, 1873): ITALY: <i>Liguria</i></b> : 1♂, 1♀, (topotypes), La Spezia Province, Grotta Bocca Lupara cave, 74/Li/SP, 120m a.s.l., 05.III.1969, leg. P.M. Brignoli (MSNV) (Brignoli, 1971); <i>Toscana</i>: 1♀, Lucca Province, Garfagnana area, Villa Collemandina Municipality, Canigiano village, Tana di Magnano cave, 162/T/LU, 653m a.s.l., 44.177285°N, 10.38803°E, 03.XI.1967, leg. A. Vigna Taglianti (MSNV) (Brignoli, 1971), 1♀, 01.VIII.1975, leg. P. Magrini (MSNV), 4♀♀, 14.VIII.2015, leg. F. Ballarin and M. Gaiga (MSNV); 1♀, Forno- volasco (not reported in the label but very likely from Grotta del Vento cave), 700m a.s.l., 16.VI.1970, leg. O. Osella (MSNV) (Brignoli, 1971); 1♀, Grotta del Buggine cave, 166/T/Lu, 315m a.s.l., 07.X.1967, leg. G. Castellini (MSNV) (Brignoli, 1971); 1♀, Massa-Carrara, Buca della Freddana cave, 230/T/Ms, 550m a.s.l., 05.VI.1977, leg. C. Bonzano (MSNV) (Brignoli, 1985); 1♀, Buca del Bacile cave, 226/T/Ms, 10.III.1975, leg. unknown (MSNV) (Brignoli, 1985).</p> <p> <b> <i>Domitius menozzii</i> (di Caporiacco, 1934): ITALY, <i>Liguria</i></b> , 1♂, 4♀♀, north-east of Genova town, Tanna da Vulpe cave, 264/Li/GE, 23.XI.1969, leg. A. Vigna Taglianti (MSNV) (Brignoli, 1971); 2♂♂, 2♀♀, Creto, Tanna de Fate cave, 17/ Li/GE, 30.X.1971, leg. G. Gardini (MSNV); 2♀♀ (topotypes), Prati di Bavari locality, Tanna da Suja cave, 5/Li/GE, 582m a.s.l., 44.422894°N, 09.035239°E, 30.V.2013, leg. F. Ballarin, A. Trotta, G. Gardini, and S. Zoia.</p> <p> <b> <i>Domitius sbordonii</i> (Brignoli, 1979): ITALY, <i>Lazio</i></b> , 1♂ (holotype), Frosinone Province, Supino, Valle Serena, Grot- ta della Croce cave, 01.IX.1977 leg. V. Sbordoni (MSNV) (Brignoli, 1979); 1♀ (paratype), 08.II.1976, leg. V. Sbordoni (MSNV) (Brignoli, 1979).</p> <p> <b> <i>Kryptonesticus eremita</i> (Simon, 1880): ITALY, <i>Liguria</i>:</b> 2♂♂ (sub. <i>Nesticus menozzii</i>), Creto, Tanna de Fate cave, 17/Li/GE, 30.X.1971, leg. G. Gardini (MSNV); <i>Emilia-Romagna:</i> 2♀♀ Ravenna Province, Riolo Terme, Borgo Rivola, Grotta del Re Tiberio cave, 36/Er/RE. 19.II.1951, Leg. Denis (MSNV) (Zangheri, 1966, sub. <i>Nesticus speluncarum</i>); <b> <i>Toscana</i>:</b> 1♀ Garfagnana area, Lucca Province, Coreglia Antelminelli Municipality, Tana delle Fate di Coreglia Antel- minelli cave, 141/T/LU, 260m a.s.l., 44.046336°N, 10.523525°E, 15.VIII.2015, leg. F. Ballarin and M. Gaiga (MSNV); 3♀♀, 24.VI.2017, Leg. F. Ballarin and R. Ballarin (MSNV-MSNVRAr/m 0007); 1♀, 21.VIII.2018, leg. F. Ballarin and D. Avesani (MSNV); <i>Campania:</i> 1♀, Avellino Province, Bagnoli Irpino, Mt. Piacentini, Grotta Giovannino cave, 16.VI.1956, leg. S.Ruffo (MSNV) (Kritscher, 1958, sub. <i>Nesticus speluncarum</i>).</p> <p> <b>Etymology</b></p> <p>The name of the new species is derived from the Etruscan goddess Culsu who, according to the Etruscan mytholo- gy, ruled the cave-like entrance of the underworld. Noun in apposition.</p> <p>Diagnosis</p> <p>Species closely re- lated to D. speluncarum and D. menozzii. Males of D. culsu sp. nov. can be separated from males of all other Italian species of the genus Domitius by the different shape of the apophyses of the para- cymbium (Figs. 1A‒C, 2B,C vs. Fig. 4A‒I). D. culsu sp. nov shows a robust, S-shaped dorsal apophysis 1 in contrast with a large, flat and axe- like Da 1 in D. speluncar- um (Figs. 1A‒C, 2B, C vs. Fig. 4A‒C); a short and stumpy Da 1 in D. me- nozzii (Figs. 1A‒C, 2B, C vs. Fig. 4D‒F) or a long and thread-like Da 1 in D. sbordonii (Figs. 1A‒C, 2B, C vs. Fig. 4G‒I). Addi- tionally, males of D. culsu sp. nov. have a well-de- veloped, triangular medi- an apophysis, absent in males of the other three species (Figs. 1A, 2A vs. Fig. 4A, D, G).</p> <p>Female D. culsu sp. nov. can be easily distin- guished from female D. speluncarum by the nar- rower, trapezoid-shaped median septum with slant- ing edges, in contrast with the larger, lobate Ms with rounded edges in D. spe- luncarum (Figs. 1E, 2D vs. Fig. 5A). Female D. culsu sp. nov. are separated from female D. morisii by the absence of a bulge on the Ms (clearly visible in <i>D. morisii</i>, Figs. 1E, 2D vs. Fig. 5C). Additionally, they can be distinguished by the different shape of copulatory ducts when the vulva is observed dorsally: with a rather uniform diameter in <i>D. culsu</i> sp. nov. and bearing a large, flattened middle trait in <i>D. morisii</i> (Figs. 1G, 2E vs. Fig. 5D). Female <i>D. culsu</i> sp. nov. are easily sepa- rated from those of <i>D. sbordonii</i> by the trapezoid-shaped Ms with slanting edges, in contrast with the squared Ms with vertical edges in <i>D. sbordonii</i> (Figs. 1E, 2D vs. Fig. 5E). They can further be distinguished by the different position of spermathecae, located in the lower half of the vulva and below the vulval pockets in <i>D. culsu</i> sp. nov., in contrast with S located in the upper half of vulva and above Vp in <i>D. sbordonii</i> (Figs. 1G, 2E vs. Fig. 5F). <b>Description. Male (holotype).</b> Total length 4.19. Carapace: 1.81 long, 1.56 wide.</p> <p>Habitus as in Fig. 3A. Carapace uniformly pale yellow with some sparse setae (more reddish while alive, see Fig. 3A). Cephalic region not clearly differentiated from the rest of carapace. Eyes reduced, AM missing, reduced to black maculae. Eye diameters: AM -, AL 0.079, PM 0.080, and PL 0.078. Thoracic grooves and fovea distinct. Mouthparts and sternum uniformly colored as the carapace. Promargin of chelicera with three teeth approximately of the same size, retromargin with several small denticles. Legs uniformly light yellowish. Legs measurements as follows: I 17.40 (4.89, 0.90, 4.78, 4.90, 1.93), II 14.03 (3.92, 0.80, 3.67, 3.76, 1.88), III 10.35 (3.19, 0.69, 2.53, 2.79, 1.15), IV 13.47 (4.34, 0.84, 3.53, 3.49, 1.27). Leg formula: I, II, IV, III. Opisthosoma gray-yellowish colored (lighter than carapace while alive, see Fig. 3A), covered with long hairs.</p> <p>Palp as in Figs. 1 A‒C, 2A-C. Cymbium oval, covered with short, sparse setae, with a tuft of longer hairs in the pro- lateral distal area near the tip. Embolus filamentous, slender in the terminal part. Conductor complex with three distinct processes: Cp 1-3. Cp 1 stocky and roughly triangularly shaped, Cp 2 and Cp 3 located at the distal part of the bulb and diagonally protruding (approx. 2 o’clock seeing the left palp ventrally), their tips curved towards each other (Figs. 1A, C, 2A, C). Median apophysis well-developed, shaped as a long, sharp triangle, heading prolaterally (Figs. 1A, 2A). Para- cymbium large with well-developed, sclerotized dorsal, distal and ventral processes. Two dorsal apophyses, Da 1-2: Da 1 robust and long, ending sharply, S-shaped when the palp is observed dorsally, Da 2 stocky, triangularly-shaped. Distal apophysis triangularly shaped. Ventral apophysis lobate, dorso-ventrally flattened and heading toward the cym- bium (Figs. 1 A‒C, 2A-C).</p> <p> <b>Female (based on 4 paratypes)</b>. Total length 3.65–5.27. Carapace: 1.71–1.98 long, 1.54–1.64 wide.</p> <p>Habitus as in Fig. 3B, C. Carapace uniformly yellowish with some sparse setae (often more reddish while alive, see Fig. 3B). Cephalic region not clearly differentiated from the rest of the prosoma.Eyes reduced, AM strongly reduced and bare- ly visible, reduced to small, dark maculae in some specimens. Eye diameters: AM (when present): 0.032, AL: 0.087, PM: 0.078, and PL: 0.77. Thoracic grooves and fovea distinct. Mouthparts and sternum uniformly colored as in the carapace. Teeth of chelicera as in the male. Legs uniformly light yellowish. Leg measurements as follows: I 17.07 (4.38, 1.01, 4.95, 4.90, 1.83), II 13.69 (4.04, 0.92, 3.57, 3.64, 1.52), III 10.46 (3.43, 0.80, 2.50, 2.56, 1.17), IV 13.89 (4.64, 0.92, 3.59, 3.41, 1.33). Leg formula: I, IV, II, III. Opistho- soma yellowish-gray (often lighter colored than carapace while alive, see Fig. 3B), covered with long hairs.</p> <p>Epigyne as in Figs. 1E, F, 2D, E. Medi- an septum short, not protruding, shaped as an inverted trape- zoid with a narrower base. Vulval pockets and copulatory ducts externally visible by transparence trough the tegument. Copu- latory openings at the lower, lateral side of median septum. Vul- va as in Figs. 1G, 2E. Spermathecae small and round, located in the lower-half of the vulva, below vulval pockets and being partially covered by them. Vulval pockets wide and rounded, sac-shaped, located above spermathecae. Copulatory ducts with a wider diameter in the ventral trait and narrower in the dor- sal trait, rolling up around the lower part of vulval pockets and reaching spermathe- cae with some turns (Figs. 1F, 2E). Insem- ination ducts begin- ning from the lower part of spermathe- cae and following the same course of copu- latory ducts.</p> Distribution Italy, endemic to the northern Apennines. Known only from the type locality; Tana delle Fate di Coreglia Antelminelli cave (Fig. 6). Biospeleological and ecological notes <p>The entrance of Tana delle Fate di Coreglia Antelminelli cave (Italian National Caves Registry number: 141/T/LU; Fig. 3E) opens in the left bank of the narrow valley of Segone Creek in the Province of Lucca (Toscana region) at an elevation of 260 m a.s.l. The cave occurs in the limestone of the Maiolica formation (lower Tithonian‒lower Aptian, ~150–120 Ma), which is particularly rich in flint nodules. After an initial steep slope (approximately 10 m deep), the cave continues with a long and sub-horizontal spatial development and a general NW‒SE orientation (Fig. 3F). It branches with several, sub-circular tunnels as a result of ancient groundwater flows. The cave has an estimated total extension of 1100 m, although the deeper segments are still unexplored, as they are either filled with water or ending with sumps. The inner section is generally humid, with mud often covering the bottoms of the tunnels. The cave hosts a rich sub- terranean fauna including some endemic or locally protected species, e.g. the carnivorous land snail <i>Oxychilus</i> sp. (Gastropoda, Oxychilidae), the cave cricket <i>Dolichopoda laetitiae</i> Minozzi, 1920 (Orthoptera, Rhaphidophoridae), the blind subterranean beetle <i>Duvalius apuanus lanzai</i> Straneo, 1943 (Coleoptera, Trechinae), the Italian cave salamander <i>Speleomantes italicus</i> (Dunn, 1923) (Amphibia, Plethodontidae), and three species of bats: the greater horseshoe bat <i>Rhinolophus ferrumequinum</i> (Schreber, 1774), the lesser horseshoe bat <i>Rhinolophus hipposideros</i> (Bechstein, 1800) (Chiroptera, Rhinolophidae), and the common bent-wing bat <i>Miniopterus schreibersii</i> (Kuhl, 1817) (Chiroptera, Miniop- teridae). Other animals known from the cave from the literature (Lanza, 1961) or directly observed by the author include: <i>Octodrilus complanatus</i> (Dugès, 1828), <i>O. hemiandrus (</i> Cognetti, 1901), <i>O. transpadanus</i> (Rosa, 1884), and <i>Aporrectodea rosea</i> (Savigny, 1826) (Anellida, Lumbricidae); <i>Chaetophiloscia cellaria</i> (Dollfus, 1884) (Isopoda, Philosciidae), <i>Androniscus dentiger</i> Verhoeff, 1908, and <i>Spelaeonethes mancinii</i> (Brian, 1913) (Isopoda, Trichoniscidae); <i>Euscorpius carpathicus</i> (Linnaeus, 1767) (Scorpiones, Euscorpiidae); <i>Trogulus</i> sp. (Opiliones, Trogulidae), <i>Ischyropsalis</i> a <i>damii</i> Canestrini, 1873 (Opiliones, Ischyropsalididae); <i>Lithobius tylopus</i> Latzel, 1882 (Chilopoda, Lithobiidae), <i>Gryllomorpha dalmatina</i> (Ocskay, 1832) (Orthoptera, Gryllidae), <i>Hypaena</i> sp. (Lepidoptera, Noctuidae), <i>Stenophylax permistus</i> Mc- Lachlan, 1895 (Tricoptera, Limnephilidae), and a large population of limoniid crane flies (Diptera, Limoniidae). Near the entrance and in the early section of the cave, numerous spiders were also observed: <i>Amaurobius ferox</i> (Walckenaer, 1830), <i>A. pesarinii</i> Ballarin and Pantini, 2017 (Amaurobiidae), <i>Kryptonesticus eremita</i> (Simon, 1880) (Nesticidae), <i>Meta menardi</i> (Latreille, 1804), <i>Metellina merianae</i> (Scopoli, 1763) (Tetragnathidae), <i>Pholcus phalangioides</i> (Fuesslin, 1775) (Pholcidae), and <i>Tegenaria</i> sp. (Agelenidae). The new species was found in the initial segments of the cave, but at some distance from the entrance (Fig. 3F). During summer, when the cave was visited, adults, subadults, and juveniles of <i>D. culsu</i> sp. nov. were observed together, with a substantially higher number of adults and subadults during the month of August. Most of the juveniles collected in the cave and bred in captivity became adults after 2‒3 months of captivity, while it took approximately one year for the youngest specimens to reach sexual maturity.</p> <p>Two different species of nesticid spiders, <i>K. eremita</i> and <i>D. culsu</i> sp. nov., were collected together in the Tana delle Fate di Coreglia Antelminelli cave. These species cover a different spatial distribution within the cave (Fig. 3F), coexisting without overlapping despite occupying approximately the same ecological niche. Cohabitant nesticids, in particular involving <i>D. menozzii</i> or <i>D. speluncarum</i> together with <i>K. eremita</i>, have been previously observed in several occasions in Italian caves, and sometimes collected at short distances from each other (Brignoli, 1971). However, no clear species overlap are reported within the same cave. Such distinct spatial partition can be explained by the different grade of adaptation to the hypogean environment showed by these arachnids. In fact, <i>K. eremita</i> appears to be a less specialized cave-dweller, lacking extreme morphological adaptations to subterranean life. Therefore, it mostly occurs near the entrance of caves or inside artificial tunnels, including, occasionally, shadowed epigean habitats with constant temperature and high relative humidity (Brignoli, 1971 and personal observations by the author). On the other hand, all <i>Domitius</i> species show a greater degree of adaptation to the subterranean habitat, as suggested by reduction of the eyes and body depigmentation. Such strong adaptation allows <i>Domitius</i> to occupy deeper segments of the caves, thus avoiding direct competition with <i>K. eremita</i>.</p> <p>The entrance of Tana delle Fate di Coreglia Antelminelli cave (Italian National Caves Registry number: 141/T/LU; Fig. 3E) opens in the left bank of the narrow valley of Segone Creek in the Province of Lucca (Toscana region) at an elevation of 260 m a.s.l. The cave occurs in the limestone of the Maiolica formation (lower Tithonian‒lower Aptian, ~150–120 Ma), which is particularly rich in flint nodules. After an initial steep slope (approximately 10 m deep), the cave continues with a long and sub-horizontal spatial development and a general NW‒SE orientation (Fig. 3F). It branches with several, sub-circular tunnels as a result of ancient groundwater flows. The cave has an estimated total extension of 1100 m, although the deeper segments are still unexplored, as they are either filled with water or ending with sumps. The inner section is generally humid, with mud often covering the bottoms of the tunnels. The cave hosts a rich sub- terranean fauna including some endemic or locally protected species, e.g. the carnivorous land snail <i>Oxychilus</i> sp. (Gastropoda, Oxychilidae), the cave cricket <i>Dolichopoda laetitiae</i> Minozzi, 1920 (Orthoptera, Rhaphidophoridae), the blind subterranean beetle <i>Duvalius apuanus lanzai</i> Straneo, 1943 (Coleoptera, Trechinae), the Italian cave salamander <i>Speleomantes italicus</i> (Dunn, 1923) (Amphibia, Plethodontidae), and three species of bats: the greater horseshoe bat <i>Rhinolophus ferrumequinum</i> (Schreber, 1774), the lesser horseshoe bat <i>Rhinolophus hipposideros</i> (Bechstein, 1800) (Chiroptera, Rhinolophidae), and the common bent-wing bat <i>Miniopterus schreibersii</i> (Kuhl, 1817) (Chiroptera, Miniop- teridae). Other animals known from the cave from the literature (Lanza, 1961) or directly observed by the author include: <i>Octodrilus complanatus</i> (Dugès, 1828), <i>O. hemiandrus (</i> Cognetti, 1901), <i>O. transpadanus</i> (Rosa, 1884), and <i>Aporrectodea rosea</i> (Savigny, 1826) (Anellida, Lumbricidae); <i>Chaetophiloscia cellaria</i> (Dollfus, 1884) (Isopoda, Philosciidae), <i>Androniscus dentiger</i> Verhoeff, 1908, and <i>Spelaeonethes mancinii</i> (Brian, 1913) (Isopoda, Trichoniscidae); <i>Euscorpius carpathicus</i> (Linnaeus, 1767) (Scorpiones, Euscorpiidae); <i>Trogulus</i> sp. (Opiliones, Trogulidae), <i>Ischyropsalis</i> a <i>damii</i> Canestrini, 1873 (Opiliones, Ischyropsalididae); <i>Lithobius tylopus</i> Latzel, 1882 (Chilopoda, Lithobiidae), <i>Gryllomorpha dalmatina</i> (Ocskay, 1832) (Orthoptera, Gryllidae), <i>Hypaena</i> sp. (Lepidoptera, Noctuidae), <i>Stenophylax permistus</i> Mc- Lachlan, 1895 (Tricoptera, Limnephilidae), and a large population of limoniid crane flies (Diptera, Limoniidae). Near the entrance and in the early section of the cave, numerous spiders were also observed: <i>Amaurobius ferox</i> (Walckenaer, 1830), <i>A. pesarinii</i> Ballarin and Pantini, 2017 (Amaurobiidae), <i>Kryptonesticus eremita</i> (Simon, 1880) (Nesticidae), <i>Meta menardi</i> (Latreille, 1804), <i>Metellina merianae</i> (Scopoli, 1763) (Tetragnathidae), <i>Pholcus phalangioides</i> (Fuesslin, 1775) (Pholcidae), and <i>Tegenaria</i> sp. (Agelenidae). The new species was found in the initial segments of the cave, but at some distance from the entrance (Fig. 3F). During summer, when the cave was visited, adults, subadults, and juveniles of <i>D. culsu</i> sp. nov. were observed together, with a substantially higher number of adults and subadults during the month of August. Most of the juveniles collected in the cave and bred in captivity became adults after 2‒3 months of captivity, while it took approximately one year for the youngest specimens to reach sexual maturity.</p> <p>Two different species of nesticid spiders, <i>K. eremita</i> and <i>D. culsu</i> sp. nov., were collected together in the Tana delle Fate di Coreglia Antelminelli cave. These species cover a different spatial distribution within the cave (Fig. 3F), coexisting without overlapping despite occupying approximately the same ecological niche. Cohabitant nesticids, in particular involving <i>D. menozzii</i> or <i>D. speluncarum</i> together with <i>K. eremita</i>, have been previously observed in several occasions in Italian caves, and sometimes collected at short distances from each other (Brignoli, 1971). However, no clear species overlap are reported within the same cave. Such distinct spatial partition can be explained by the different grade of adaptation to the hypogean environment showed by these arachnids. In fact, <i>K. eremita</i> appears to be a less specialized cave-dweller, lacking extreme morphological adaptations to subterranean life. There
schede nn. 245, 263, 264, 313, 314, 315, 316, 361, 414
No full textOltre a quelli segnalati individualmente, l'autrice cataloga altri 9 dipinti facenti parte della raccolta civica padovan
Supported gold nanoparticles catalysts for alkynes hydroamination.
No full textOur research group has previously reported the preparation of gold nanoparticles (AuNPs) supported on different functionalized silica supports. We started using commercial polyethyleneimine-functionalized silica bead [1] and we continued preparing silica nanoparticles functionalized with alkynyl carbamate moieties. [2]
Recently, we have focused on the straightforward synthesis of AuNPs anchored on commercial, micrometric oxide supports (i.e. SiO2, Al2O3, TiO2) previously modified with the di-functional organosilane [3-(2-propynylcarbamate)propyl]triethoxysilane (PPTEOS) by a grafting procedure. After being thoroughly characterized by several complementary techniques (XPS, TEM, SSNMR, AAS etc.), the catalytic activity of these systems (Au/OS@Yne) has been evaluated in the oxidation of alcohols both in batch and continuous-flow systems. [3]
Furthermore, we have extended the same synthetic procedure to the preparation of a novel and magnetically recoverable catalyst, consisting of AuNPs supported on functionalized nano-magnetite (Au/Fe3O4@Yne).
We now present the latest results obtained in the study of the catalytic application of Au/SiO2@Yne and Au/Fe3O4@Yne in the alkynes hydroamination reaction, which is considered the most atom efficient process for the formation of a series of nitrogen-containing compounds.
Indeed, this transformation takes place without the formation of any side product and leads to the production of enamine, imine or substituted amines, which have a significant importance as bulk and fine chemicals or building blocks in organic synthesis.
[1] S. Fazzini , D. Nanni , B. Ballarin , M. C. Cassani , M. Giorgetti , C. Maccato, A. Trapananti, G. Aquilanti and S. I. Ahmed, J. Phys. Chem. C. 2012, 116, 25434−25443; M. Giorgetti, G. Aquilanti, B. Ballarin, M. Berrettoni, M. C. Cassani, S. Fazzini, D. Nanni and D. Tonelli, Anal. Chem. 2016, 88, 6873-6880;
[2] S. Fazzini, M. C. Cassani, B. Ballarin, E. Boanini, J. S. Girardon, A.S. Mamede, A. Mignani and D. Nanni, J. Phys. Chem. C. 2014, 118, 24538-24547; M. C. Cassani, B. Ballarin, D. Barreca, E. Boanini, E. Bonansegna, G. Carraro, S. Fazzini, A. Mignani, D. Nanni, D. Pinelli, RSC Adv. 2016, 6, 25780-25788.
[3] B. Ballarin, D. Barreca, E. Boanini, M. C. Cassani, P. Dambruoso, A. Massi, A. Mignani, D. Nanni, C. Parise, A. Zaghi, ACS Sus. Chem. Eng. 2017, 5, 4746-4756
Strategie glottodidattiche per l'italiano accademico: un'indagine sull'interferenza delle L1 nell'interlingua della L2 in ambito accademico
No full textLa lingua utilizzata nel contesto universitario assume caratteristiche proprie rispetto alla varietà standard e alle microlingue scientifiche e disciplinari (Ballarin, 2017a).
Recenti studi hanno dimostrato, inoltre, la specializzazione del contesto accademico rispetto alla dimensione dei sillabi, alle caratteristiche degli apprendenti e alle pratiche disciplinari (Desideri, Tessuto, 2011; Fragai, Fratter, Jafrancesco, 2017).
Data la specificità dell’academic discourse nei diversi patrimoni linguistico-culturali, è sembrato significativo interrogarsi sull’eventuale influenza delle L1 degli apprendenti e sull’impatto che comporti nella formazione dell’italiano accademico nell’interlingua dell’italiano L2. È parso opportuno, perciò, esaminare la produzione scritta e orale della L2 accademica (Ballarin, 2017b; Nitti, 2015), attraverso l’interrogazione di un corpus di produzioni linguistiche degli apprendenti in mobilità internazionale. La ricerca si prefigge di analizzare le interlingue di un campione di apprendenti, in merito all’academic discourse.
L’indagine, di natura qualitativa, è stata condotta sulla base delle produzioni scritte; in particolare sono stati analizzati i supporti .ppt e .pptx per le presentazioni orali, all’interno dei corsi di lingua italiana di livello B2-C1 di studenti internazionali provenienti da diverse realtà accademiche.
L’analisi dei dati evidenzia il bisogno di ricorrere a strategie glottodidattiche per la trattazione dell’italiano accademico e per la valorizzazione dell’academic discourse come pratica formativa
Copia da Raffaello Sanzio. 356. Sacra Famiglia
No full textSi analizza per la prima volta una copia cinquecentesca proveniente da una collezione padovana della Sacra Famiglia di Raffaello al Prado, datata 1507
Dario Varotari. 158. Madonna con il Bambino in trono, i SS. Prosdocimo, Giustina, Antonio da Padova, Daniele e tre martiri innocenti
No full textpittura veneta del tardo-rinascimento, pittura padovana, santi patron
Pittore anonimo. 419. Ritratto del capitano Antonio Da Rio
No full textLa scheda illustra un ritratto inedito del Capitano Antonio da Rio padovano le cui imprese furono scolpite sulla porta bronzea di Filarete in San Pietro a Rom
Benvenuto Tisi detto Garofalo. 65. Sacra Famiglia con i SS. Giovannino ed Elisabetta
No full textL'autrice riesamina l'opera di Garofalo e la contestualizza nell'ambito di provenienza seguendo una prospettiva di studio aggiornata
- …
