2,116 research outputs found
Necronectes michelini
No full text<p> <i>Necronectes michelini</i> (A. Milne-Edwards, 1861) (Fig. 5 D-F)</p> <p> <i>Scylla michelini</i> A. Milne-Edwards, 1861: 137, pl.3., figs 3-3A. — Couffon 1908: 3, 4, pl. 1, figs 6-10, pl. 2, figs 1, 2. — Schweitzer <i>et al.</i> 2006: 122; 2010: 110. — Karasawa <i>et al.</i> 2008: 106. — Emmerson 2017: 584.</p> <p> <i>Cancer macrochelus</i> – Millet 1854: 152 (<i>non</i> Desmarest, 1817).</p> <p> <i>Scylla</i> cf. <i>michelini</i> – Glaessner 1928: 184, 185.</p> <p> <i>Scylla</i> ? <i>michelini</i> – Glaessner 1929: 374.</p> <p> <i>Scylla</i> sp. (cf. <i>michelini</i>) – Lőrenthey & Beurlen 1929: 178, pl. 15, figs 5, 6.</p> <p> <i>Necronectes michelini</i> – Glaessner 1933: 5-6. — De Angeli & Marangon 1992: 178, 179.</p> <p> <i>Scylla michelini</i> ? – Betancort <i>et al.</i> 2014: 345, pl. 1, figs K1-K2 (<i>non</i> I1-I2)</p> <p>MATERIAL EXAMINED AND MEASUREMENTS (in mm). — Two dactyli. Right dactylus, ULB-SO-9: L = 41.38, H = 25. — Left dactylus (tip broken off), ULB-SO-10: L = 32.53, H = 15.52.</p> <p>LOCALITY AND HORIZON. — ‘La Sonneterie’ quarry, Meigné-le- Vicomte (Maine-et-Loire). ‘Savignean facies’, Langhian-Serravallian (Middle Miocene).</p> <p>DESCRIPTION</p> <p>Right dactylus stout, gently curved forward; subrectangular in section with rounded upper angles; strong proximal knobstick molariform tooth followed by six serial rounded conical teeth of different sizes; rounded tip. Left dactylus stout, gently curved forward; subrectangular in section with rounded upper angles, proximal tooth and tip not preserved.</p> <p>REMARKS</p> <p> <i>Scylla michelini</i> was erected based on fragmentary chelipeds and was referred to <i>Scylla</i> De Haan, 1833, because of its similarity to the strong chelipeds of the extant <i>S. serrata</i> (Forskål, 1775). Nevertheless, A. Milne-Edwards (1861: 136), pointed out the absence in <i>S. michelini</i> of the two typical distinct spines on the distal upper part of the palm, near the insertion of dactylus (see Couffon 1908: pl. 1, figs 6-10, t. 2, figs 1, 2; MNHN.F.B25950, which are present in <i>Scylla</i> species (e.g. Keenan <i>et al.</i> 1998; Trivedi & Vachhrajani 2013). Rathbun (1918: 168), when described <i>Necronectes proavitus</i> (as <i>Gatunia proavita</i>), pointed out as well, the absence of those spines as a differential trait with <i>Scylla,</i> and also noted the striking similarity between the cheliped of <i>N. proavitus</i> and that of <i>S. michelini</i> (Rathbun 1918: 171). Furthermore, A. Milne-Edwards (1861: 136) noted as well, that the upper margin of the palm of <i>S. michelini</i> is rounded, whereas it is usually more flattened and angled in <i>Scylla</i> species (see Keenan <i>et al.</i> 1998: fig. 8).</p> <p> Subsequently, several authors assigned similar fragmentary remains of dactyli y to <i>Scylla michelini</i> (see synonym list). Glaessner (1933: 5), included <i>S. michelini</i> within <i>Necronectes</i> A. Milne-Edwards, 1881, being followed by De Angeli & Marangon (1992: 178, 179). Nevertheless, this placement was questioned by Schweitzer <i>et al.</i> (2006: 121, 122), which retained <i>S. michelini</i> within <i>Necronectes</i> (see also Karasawa <i>et al</i>. 2008: 106).</p> <p> The aforementioned differences in the palms, such as the absence of the outer and inner spines on distal margin, and the strong spine at carpal articulation of propodus, further, the absence of spines on the outer part of carpus, peculiar of the most species of <i>Scylla</i> possesses (e.g. Keenan <i>et al.</i> 1998: fig. 8; Trivedi & Vachhrajani 2013: fig. 5a-c), allow us to confirm the generic placement of <i>S. michelini</i> within <i>Necronectes</i>, as it was previously placed by Glaessner (1928, 1933).</p>Published as part of <i>Ossó, Àlex & Gagnaison, Cyril, 2019, An appraisal of the Middle-Late Miocene fossil decapod crustaceans of the ' Faluns' (Anjou-Touraine, France), pp. 367-383 in Geodiversitas 41 (9)</i> on pages 376-377, DOI: 10.5252/geodiversitas2019v41a9, <a href="http://zenodo.org/record/3700034">http://zenodo.org/record/3700034</a>
Plato as Author. The Rhetoric of Philosophy. Edited by Ann N. Michelini
No full textLefebvre René. Plato as Author. The Rhetoric of Philosophy. Edited by Ann N. Michelini. In: Revue Philosophique de Louvain. Quatrième série, tome 105, n°1-2, 2007. pp. 176-178
Necronectes michelini
No full text<p> <i>Necronectes michelini</i> (A. Milne-Edwards, 1861)</p> <p>(Fig. 6A-C)</p> <p> <i>Scylla michelini</i> A. Milne-Edwards, 1861: 137, pl. 3., figs 3-3A. — Couffon 1908: 3, 4, pl. 1, figs 6-10, pl. 2, figs 1, 2. — Schweitzer <i>et al.</i> 2006: 122; 2010: 110. — Karasawa <i>et al.</i> 2008: 106. — Emmerson 2017: 584.</p> <p> <i>Cancer macrochelus</i> – Millet 1854: 152 (<i>non</i> Desmarest, 1817). <i>Scylla</i> cf. <i>michelini</i> – Glaessner 1928: 184, 185.</p> <p> <i>Scylla</i> ? <i>michelini</i> – Glaessner 1929: 374.</p> <p> <i>Scylla</i> sp. (cf. <i>michelini</i>) – Lőrenthey & Beurlen 1929: 178, pl. 15, figs 5, 6.</p> <p> <i>Necronectes michelini</i> – Glaessner 1933: 5-6. — De Angeli & Marangon 1992: 178, 179. — Ossó & Gagnaison 2019: 376-378, fig. 5C-D.</p> <p> <i>Scylla michelini</i> ? – Betancort <i>et al.</i> 2014: 345, pl. 1, figs K1-K2 (<i>non</i> I1-I2).</p> <p>MATERIAL EXAMINED AND MEASUREMENTS (in mm). — Ventral carapace preserving chelipeds MHNH-2016-79-2003, W (from carpus to carpus) = 150. — Right dactylus, ULB-IV-A (51): L = 41.5, H = 16. — Right dactylus ULB-IV-A (41): L = 20, H = 9.5. — Fragment of right epibranchial portion of dorsal carapace bearing two last anterolateral teeth, ULB-IV-A (42): L = 17.5, W = 9.5.</p> <p>LOCALITY AND HORIZON. — ‘La Sonneterie’ quarry, Meigné-le-Vicomte (Maine-et-Loire). ‘Savignean facies’, Langhian (middle Miocene): MHNH-2016-79-2003 and ULB-IV-A (51); and, ‘Blandinerie’ quarry, Breil (Maine-et-Loire). ‘Savignean facies’, Langhian (middle Miocene): ULB-IV-A and ULB-IV-A (42).</p> <p>DESCRIPTION (EMENDED)</p> <p>Large ventral carapace preserving sternum and chelipeds, surface smooth. Sternum relatively large, flattened, maximum width at level of sternite 6. Sternite 2 subtriangular; sternite 3 inverted subpentagonal; sternite 4 subtrapezoidal; sternite 5, 6 and 7 subrectangular transversely elongate, distal margin rounded; sternite 5 placed in acute angle respect the axis of sternum, sternite 6 almost in right angle, and sternite 6 in slightly obtuse angle. Episternites posteriorly directed. Suture 2/3 complete, horizontal; suture 3/4 inverted V-shaped, weakly distinguishable, only laterally. Sutures 4/5, 5/6, and 6/7 appear complete. Pleon not preserved. Sternopleonal cavity deep, narrow, almost reaching suture 3/4. Pterygostome subtrapezoidal elongate. Ischium of third maxilliped large, with medial longitudinal groove, inner margin strongly convex; exopod subrectangular elongate, narrower than ischium. Chelipeds strong, slightly heterochelous. Merus robust, subtriangular in section, outer margin strongly vaulted, wider at mid length. Carpus strong, embedded in matrix.Right chela strong, dactyli curved distally; palm about 0.70 of length of chela, subtrapezoidal, longer than high, higher distally; upper margin rounded, slightly convex; lower margin rounded, straight; outer margin strongly convex, smooth; dactylus stout, gently curved forward, strong proximal knobstick molariform tooth followed by six serial rounded conical teeth of different sizes, and rounded tip; index stout straight with rounded tip, strong flattened proximal molariform tooth, followed by three blunt teeth.Left chela strong, elongate, slightly shorter than right chela, dactyli gently curved distally; palm subrectangular, longer than high, about 0.68 of length of chela, upper and lower margins straight, rounded, outer margin strongly convex; cutting edge of dactyli with serial conical teeth.</p> <p>R EMARKS</p> <p> Erected by A.Milne-Edwards (1861), to place fragmentary large chelipeds found in the ‘Faluns’, <i>Necronectes michelini</i>, was originally placed within <i>Scylla</i> De Haan, 1833 due to its similarity to the strong chelipeds of the extant <i>S. serrata</i> (Forskål, 1775), albeit the author already considered the differences between the chelae of both species such as the rounded upper margin of palms, which are flattened and angled in <i>Scylla</i> spp., and the absence in <i>N. michelini</i> of the two typical distinct spines on the distal upper part of the palm, near the insertion of dactylus (see Fig. 6B; Couffon 1908: pl. 1, figs 6-10, t. 2, figs 1, 2; MNHN.F.B25950), which are usually present in <i>Scylla</i> spp. (e.g. Keenan <i>et al.</i> 1998; Trivedi & Vachhrajani 2013; Vincecruz-Abeledo & Lagman 2018). Glaessner (1933: 5), included <i>S. michelini</i> within <i>Necronectes</i> A. Milne-Edwards, 1881, in view of the similarities of the chelae of both taxa. Subsequent authors assigned this species indistinctly to both genera, <i>Scylla</i> and <i>Necronectes</i>, as explained in Ossó & Gagnaison (2019: 376-378, and references therein). Since the chelipeds of the studied specimen are identical to the type series MNHN.F.B25950 described by A. Milne-Edwards (1861), the conspecificity between them is beyond doubt.</p> <p> For the first time, a specimen of <i>Necronectes michelini</i> preserving features other than the chelipeds, is available for study, although important diagnostic features, such as the dorsal carapace is not preserved. Nevertheless, the sternum of the studied specimen fits well with the sternums of other representatives of <i>Necronectes</i>, such as <i>N. proavitus</i> (Rathbun, 1918) and <i>N. schafferi</i> Glaessner, 1928 (e.g. Rathbun 1918: pl. 55; De Angeli & Berti 2017: fig. 2, 1b).</p> <p> The absence of specimens formally available for study with the preserved dorsal carapace, although some of them are known in private collections (e.g. Gagnaison <i>et al.</i>, 2020: fig. 2A), prevents us from going further in our considerations. For instance, to explore the possible conspecific relationship between the circum-Mediterranean and Paratethyan Miocene species of <i>Necronectes</i>, such as <i>N. schafferi</i> and <i>N. batalleri</i> (Vía, 1941), almost identical morphologically, and <i>N. michelini</i> (cf. Vía 1941: figs 3, 4, pl. 5, figs 31, 32, pl. 6, figs 33, 34; De Angeli & Marangon 1992: pl. 1, figs 1, 2, pl. 2, figs 1a, 1b; Ferratges 2017: fig. 43, pl. 29, fig. C).</p>Published as part of <i>Ossó, Àlex, Gagnaison, Cyril & Gain, Olivier, 2022, A re-appraisal of the middle-late Miocene fossil decapod crustaceans of the ' Faluns' (Anjou-Touraine, France), pp. 207-228 in Geodiversitas 44 (6)</i> on pages 220-221, DOI: 10.5252/geodiversitas2022v44a6, <a href="http://zenodo.org/record/6079765">http://zenodo.org/record/6079765</a>
Proposte di esperimenti sull'energia associata alla luce, La Fisica nella Scuola, XXX, 2 suppl., 1997, p.44-51
No full textMažosios Lietuvos giesmynų istorija [Storia degli innari della Lituania Minore]
No full textMažosios Lietuvos giesmynų istorija [Storia degli innari della Lituania Minore]. Pubblicazione in
lituano, lingua che Michelini usa correntemente.
Libro pubblicato dalla Casa Editrice dell’Università di Klaipėda (Lituania), dopo aver ottenuto le
recensioni favorevoli di due referees (proff. Rimantas Balsys e Rainer Eckert), menzionati nel retro
del frontespizio.
L’opera, sintesi delle ricerche svolte dall’autore nel periodo 1997-2009, comprende una trattazione
(pp. 13-264) che si articola in 8 capitoli:
1. Il primo innario della Lituania Minore: Gesmes Chriksczoniskas di Martynas Mažvydas,
2. Gli altri innari rinascimentali,
3. Naujos giesmju knygos di Daniel Klein ed edizioni aumentate (1666-1706),
4. Jß naujo pérweizdėtos ir pagérintos Giesmû Knygos di Johann Behrent ed edizioni
aumentate (1732-1748),
5. All’innario di Johann Behrent viene unita la raccolta Kélos Nobaźnos Giesmes: l’origine del
modello classico di Adam Friedrich Schimmelpfennig (1750),
6. Dalla proposta di nuovi innari all’aggiunta di una terza parte alla raccolta di Adam Friedrich
Schimmelpfennig (1781-1857),
7. Gli innari del XIX secolo per le istituzioni statali,
8. Alcuni innari non ufficiali del XIX secolo.
La trattazione si conclude con la bibliografia (pp. 266-274).
Il volume ha inoltre due appendici:
Nella prima appendice (90 autori tedeschi. Le traduzioni lituane dei loro componimenti, pp. 275-
306) si forniscono per ciascun autore tedesco una biografia sommaria ed una lista dei testi tradotti,
indicando gli equivalenti lituani e la data in cui questi sono stati pubblicati per la prima volta.
Nella seconda appendice (Silloge di testi tradotti, usciti in innari diversi, p. 307-395) si riportano
alcune decine di traduzioni lituane con originali che l’autore ha desunto da pubblicazioni coeve.
Mažosios Lietuvos giesmynų istorija [Storia degli innari della Lituania Minore]. Pubblicazione in
lituano, lingua che Michelini usa correntemente.
Libro pubblicato dalla Casa Editrice dell’Università di Klaipėda (Lituania), dopo aver ottenuto le
recensioni favorevoli di due referees (proff. Rimantas Balsys e Rainer Eckert), menzionati nel retro
del frontespizio.
L’opera, sintesi delle ricerche svolte dall’autore nel periodo 1997-2009, comprende una trattazione
(pp. 13-264) che si articola in 8 capitoli:
1. Il primo innario della Lituania Minore: Gesmes Chriksczoniskas di Martynas Mažvydas,
2. Gli altri innari rinascimentali,
3. Naujos giesmju knygos di Daniel Klein ed edizioni aumentate (1666-1706),
4. Jß naujo pérweizdėtos ir pagérintos Giesmû Knygos di Johann Behrent ed edizioni
aumentate (1732-1748),
5. All’innario di Johann Behrent viene unita la raccolta Kélos Nobaźnos Giesmes: l’origine del
modello classico di Adam Friedrich Schimmelpfennig (1750),
6. Dalla proposta di nuovi innari all’aggiunta di una terza parte alla raccolta di Adam Friedrich
Schimmelpfennig (1781-1857),
7. Gli innari del XIX secolo per le istituzioni statali,
8. Alcuni innari non ufficiali del XIX secolo.
La trattazione si conclude con la bibliografia (pp. 266-274).
Il volume ha inoltre due appendici:
Nella prima appendice (90 autori tedeschi. Le traduzioni lituane dei loro componimenti, pp. 275-
306) si forniscono per ciascun autore tedesco una biografia sommaria ed una lista dei testi tradotti,
indicando gli equivalenti lituani e la data in cui questi sono stati pubblicati per la prima volta.
Nella seconda appendice (Silloge di testi tradotti, usciti in innari diversi, p. 307-395) si riportano
alcune decine di traduzioni lituane con originali che l’autore ha desunto da pubblicazioni coeve.
Jono Berento „Jß naujo pérweizdėtos ir pagérintos Giesmû Knygos“: Mörlino traktato pritaikymas
poezijoje [L’ “Innario nuovamente riveduto e migliorato” di Jonas Berentas
Energy transformations in primary school: outcomes from a research based experimentation
No full textEnergy is a topic which appears many times in Italian curricula. The school puts a strong socioeconomical
attention to protection of the environment and experts often are invited to make speeches
on this topic in primary classroom. This type of approaches are those of newspapers and the common
language. A vast literature has highlighted those learning difficulties linked to common sense way of
looking to energy concepts and its processing (Millar R. 2005, Heron P., Michelini M. and Stefanel A.,
2008). Didactic proposals on energy topic of different approaches (Kaper, W. and Goedhart, M. 2002;
Hobson A. 2004) offer to the teacher the opportunity to treat this topic revisiting concepts in such a
way as to help children overcome the conceptual knots (Driver R. and Warrington L. 1985; Heron et.
al. 2008) that the daily context poses. In a research based experimentation the HMS (HMS - Heron et.
al. 2008) approach is adopted to build the concepts of energy by means of experimental exploration,
and to complete a teaching of energy based on the content offered by text book: energy form, energy
production. The experimental class includes twenty three 8-year-old children of a school of Perugia, Italy.
HMS educational path has been applied using Inquiry based learning strategy and monitoring learning by
means of boarding diary, in(I)-out(O)- and post(P)-tests (IOP tests). Some interesting elements emerge,
especially concerning transformation concept, which appears in different key-situations explored
Ade, Michelini & Vigiani (2022), Proportionality in Liquid Democracy and Representative Democracy
No full textProceedings of the ESSLLI 2022 Student Session
Proportionality in Liquid Democracy and Representative Democracy
Leyla Ade, Matteo Michelini and Pietro Vigiani
In this paper, we compare liquid democracy to representative democracy with respect to a proportionality principle, according to which agents with higher stakes should have more voting weight. We provide a formal model of voting systems that models agents' uncertainty towards a voting issue as influenced by stakes in the issue. We formalise the delegation process in representative democracy and liquid democracy and prove that only the latter satisfies the proportionality principle.</p
Building vertical paths in exploring magnetic phenomena developing formal thinking
No full textThe situated nature of the scientific learning requires studies on the role of phenomena exploration in order to activate conceptual change for the scientific and formal thinking (Guile & Young 2003; Vosniadou, 2008; Michelini, 2005, 2010). Design Based Research and Empirical Research are integrated in the framework of Model of Educational Reconstruction (Duit 2006) to individuate a vertical path facing the wide spectra of difficulties evidenced by literature on electromagnetism at different age students (Galili 1995; Borges 1999; Maloney 2001, Guisasola 2003). Rather than general results or catalogues of difficulties, we look at the obstacles that must be overcome to reach a scientific level of understanding. Milestones of a vertical path on electromagnetism and two examples of research based intervention modules on magnetic field properties in primary and secondary school are presented
Sulfonamide accumulation and effects on herbaceous and woody plants and microorganisms
No full textOne of the main routes through which pharmaceuticals may enter the environment consists in the medication of livestock. In fact, in Europe the annual national sales of active substance for veterinary consumption reach hundreds of tons. After medication, up to 90% of the administered medicine dose may be excreted unaltered and, following the use of manure as fertilizer, soils and waters are contaminated. The present work focuses on the effects and eventual accumulation on woody and herbaceous plants of sulfonamides, a group of antimicrobial agents (from now on called antibiotics) frequently detected in agricultural ecosystems, whose persistence poses a serious risk to soil and water living organisms.
The thesis consists of 7 chapters, presenting, in the first one, a general introduction on the antibiotic presence in the environment and its consequences on the growth and development of exposed living organisms.
Subsequently, from chapter 2 to chapter 6, various experimental trials are presented, some of them carried out under laboratory conditions and others in greenhouse. More specifically, chapter 2 reports the first study performed, which deals with Salix fragilis L. plant response and the accumulation of sulfadimethoxine antibiotic, added in the nutrient solution at doses ranging from 155 to 620 mg l-1. Such a study highlights the potential of this woody species to absorb and accumulate the active molecule at the level of root apparatus. Chapter 3 retraces the experimental design of chapter 2, with the difference that Salix fragilis L. plants were exposed to environmental relevant sulfadimethoxine doses, from 0.01 up 10 mg l-1. The trial had demonstrated that no adverse effects on the growth of willow plants appeared up to 1 mg l-1 of antibiotic. Conversely, increasing levels of the antibiotic caused important alterations of the willow root architecture. Chapters 4 and 5 consider, respectively, the effects and accumulation of a different sulfonamide on Salix fragilis L. and Zea mays L. plants, grown in a soil spiked with 10 and 200 mg kg-1 of sulfadiazine. Moreover, its impact on the composition of root associated soil microbial community and on the activities of selected enzymes was analyzed. The last study, presented in chapter 6, focuses on alterations induced by about 10 mg l-1 of sulfadimethoxine and sulfamethazine on Hordeum vulgare L. root structure and function. This chapter highlights the strong effects of the antibiotics, not only on the root apparatus morphology, but also on the membrane integrity of root cells.
To conclude (chapter 7), it is highlighted that Salix fragilis L. seems to better accumulate and withstand the active molecules tested than Zea mays L. and Hordeum vulgare L., while the herbaceous species are more vulnerable to this kind of pollutant exposure and, therefore, not recommended for eventual remediation purposes. Furthermore, chapter 7 notes the adverse consequences on the functional and structural diversity of the soil microbial community
Accumulation and effects in Salix fragilis of an antibacterial sulfonamide
No full textAccumulation and effects in Salix fragilis of an antibacterial sulfonamide
Lucia Michelini, Franco Meggio1, Paolo Paiero and Rossella Ghisi*
Department of Biotecnologie Agrarie, University of Padova, Italy
1Department of Agronomia Ambientale e Produzioni Vegetali, University of Padova, Italy
The application of contaminated manure to fertilize agricultural soils is among the major routes through which antibacterial sulfonamides (SAs) enter the environment. SAs can be easily leached into groundwater, due to their persistence and low sorption to soil constituents. In effect, the presence of these compounds in soil, surface water and groundwater are frequently reported. Previous results showed that barley plants are able to accumulate high amount of SAs from nutrient solutions. Salix is currently under intensive research for its potential use in soil phytoremediation. In this study we evaluated the possibility to use willows to remediate soils/groundwater contaminated with SAs, by studying both the ability of these plants to absorb sulfadimetoxine (SDM) and to tolerate it. The experiments were conducted with Salix fragilis cuttings grown hydroponically in a climate chamber. Once rooted and with leaves, plants were exposed to different concentrations of SDM (0.04 to 3 mM) for a month. At fixed time intervals photosynthetic (LI-COR 6400) and growth parameters were measured. At the end of the experiments plants were analysed for their content in sulfadimetoxine. Photosynthetic pigments and chlorophyll fluorescence were also analysed to obtain further information on response of willow to sulfonamides.
Results show that Salix fragilis growth (leaf and stem length), photosynthetic pigment contents, chlorophyll fluorescence parameters and transpiration are not influenced by the treatment, however, the measures of CO2 fixation during leaf development indicate a lower photosynthetic rate in treated plants than in controls, which must be studied. Roots accumulated high amount of SDM, whereas leaves did not show the presence of the antibacterial substance.
In conclusion our results indicate that willow is a promising specie in the phytoremediation of sulfonamides, however further researches are needed to analyse plant response to lower, more realistic sulfonamide concentrations and to evaluate the response of different Salix species
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