170,360 research outputs found
Incoherencias y pensamiento matemático: la influencia de los lenguajes matemáticos y representaciones sobre el razonamiento en el dominio del infinito
No full textLas ideas, resultados y reflexiones que desarrollamos, son producto de estudios y parte de investigaciones (Garbin 2000 y Garbin, 2003,2004) que han pretendido contribuir con el debate de la problemática del infinito matemático en su dualidad potencial-actual, desde la específica, que genera la influencia de las representaciones y distintos lenguajes matemáticos sobre las percepciones del infinito y razonamientos matemáticos asociados, y en las inconsistencias e incoherencias de las respuestas de los alumnos a problemas que están presentes procesos infinitos
Historia Apollonii Regis Tyri Français ancien
No full textCar. goth., 8 gravures sur bois dans le texteSig. a-b⁸, c¹⁰Titre usuel: Roman d'Apollin roi de TyrLibellé du colophon (f. 26 r°): Cy finist le roman de Appollin roy de thir//imprime a genesve Par maistre Louys//garbin. Deo grasExiste aussi en microfil
Melanochelys tapani Garbin, Bandyopadhyay & Joyce, 2020, nom. nov.
No full text<i>Melanochelys tapani</i> nom. nov. <p>Fig. 32</p> <p> <i>Nicoria tricarinata</i> var. <i>sivalensis</i> Lydekker, 1889b: 100.</p> <p> <i>Geoemyda tricarinata</i> Smith, 1931: 95.</p> <p> <i>Melanochelys tricarinata</i> TEWG, 2015: e.46.</p> Type <p>BMNH 39839, a near complete fossil shell (Fig. 32).</p> Differential osteological diagnosis using shell characters <p> <i>Melanochelys tapani</i> can be differentiated from other <i>Melanochelys</i> species by the following combination of characters: presence of three carapacial keels, a highly domed shell, hexagonal second to fourth vertebrals that are wider than long, and a large cervical scute.</p> Etymology <p>The specific name is in honour of the late Prof. Tapan Roy Chowdhury of the Indian Statistical Institute, the distinguished teacher and researcher of Indian fossils, who established a school of vertebrate palaeontologists in India.</p> Material examined <p> <b>Holotype</b></p> <p>INDIA • Siwalik Hills; Miocene–Pliocene; BMNH 39839.</p> Type locality and horizon <p>Miocene/Pliocene of the Siwalik Hills, likely of India.</p> Description of type <p> BMNH 39839 (Fig. 32), holotype of <i>Melanochelys tapani</i> nom. nov. and subsequent holotype of <i>Nicoria tricarinata sivalensis</i> – This is an almost complete carapace associated with a partial plastron from the Miocene/Pliocene Siwalik Hills, likely of India, originally figured and described by Lydekker (1885a: pl. 21.4; 1889b: fig. 21). Our observation of this specimen overall confirms the observations of Lydekker (1889b), but we also illustrate the plastron and a less idealized carapace that lacks sutures (Fig. 32). A part of the anterior margin of the carapace and all posterior peripherals are missing. Total carapace length is approximately 17 cm. Most sulci are preserved on the carapace, but only very few on the plastron. Three longitudinal carapacial keels are present. The lateral keels are closer to the center of the carapace than to the borders. A cervical scute is present. The first vertebral scute is wider than long and contacts the first marginal scutes. The second to fifth vertebral scutes are about the same size and wider than long. The sulcus between the second pleural and third vertebral is straight. The sulcus between the second and third pleural contacts the fifth marginal scute. Most of the plastral surface is not preserved. The anterior plastron margin straight and lacks a median notch. The gular scutes are longer than wide. The pectoroabdominal sulcus contacts the sixth marginal scute.</p> Comments <p>See Discussion for further details.</p>Published as part of <i>Garbin, Rafaella C., Bandyopadhyay, Saswati & Joyce, Walter G., 2020, A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan, pp. 1-67 in European Journal of Taxonomy 652</i> on pages 47-48, DOI: 10.5852/ejt.2020.652, <a href="http://zenodo.org/record/3860236">http://zenodo.org/record/3860236</a>
Fig. 16. BMNH 39837 in A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan
No full textFig. 16. BMNH 39837, referred to Pangshura flaviventer Günther, 1864 by Lydekker (1885a), here identified as Pangshura sp. A. Photograph of carapace. B. Illustration of carapace. C. Photograph of plastron. D. Illustration of plastron. Scale bar: 3 cm.Published as part of Garbin, Rafaella C., Bandyopadhyay, Saswati & Joyce, Walter G., 2020, A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan, pp. 1-67 in European Journal of Taxonomy 652 on page 24, DOI: 10.5852/ejt.2020.652, http://zenodo.org/record/386023
Softening and swelling mechanism affecting south slope of Civita di Bagnoregio (VT)
No full textCivita di Bagnoregio is a small village in Central Italy, located on the top of a hill and affected by landslides that are progressively reducing the urban area. The access consists of a pedestrian bridge that connects Bagnoregio municipality to the village. The south slope beneath the bridge, is involved by frequent instability phenomena. This work describes the analysis carried out and it aimed at the definitions of geological and geotechnical mechanism affecting the above mentioned slope. A geotechnical survey has been carried out. These surveys showed the presence of a superficial layer, resulting from the softening and swelling of underlying clay-silty strongly overconsolidated, responsible for the superficial landslide phenomena. A slope stability and a 3D laser scanner model has been carried out. The analysis demonstrates that a correct design for the landscape preservation and consolidation of unstable towns needs an understanding of triggering mechanism and geotechnical properties of the involved soils. © 2013 Taylor & Francis Group, London
Genetic and morphological evidences for the existence of a new species of Contracaecum (Nematoda: Anisakidae) parasite of Phalacrocorax brasilianus (Gmelin) from Chile and its genetic relationships with congeners from fish-eating birds.
No full textContracaecum australe n. sp. is described from the Neotropic cormorant Phalacrocorax brasilianus in Chile based on morphology and the sequence analyses of multiple loci, i.e., mitochondrial cytochrome oxidase 2, mtDNA cox-2, the small subunit of the mitochondrial ribosomal RNA gene, rrnS, and the ITS-1 and ITS-2 regions of nuclear ribosomal DNA. Moreover, sequence analysis of the same genes was carried out on the morphospecies Contracaecum chubutensis Garbin et al. (2008) from Phalacrocorax atriceps. Further, genetic relationships are presented between C. australe n. sp. and C. chubutensis with respect to the related congeners from fish-eating birds previously characterized genetically on the same genetic markers, i.e., Contracaecum rudolphii A, B, C, D, and E, Contracaecum septentrionale, Contracaecum microcephalum, Contracaecum bioccai, Contracaecum pelagicum, Contracaecum micropapillatum, Contracaecum gibsoni, and Contracaecum overstreeti. Several phylogenetic analyses (MP, NJ, and BI) inferred from mitochondrial genes (cox-2 , rrnS) were congruent in depicting C. australe n. sp. and C. chubutensis as forming distinct clades, highly supported, from the remainder of the Contracaecum taxa considered; thus, it validates their specific status. Further, analyses of the ITS-1 and ITS-2 sequence data of C. australe n. sp. and C. chubutensis supported their distinction with respect to the 2 sibling species, C. rudolphii D and C. rudolphii E, previously detected from Phalacrocoracidae of Australia. Morphological analysis and the differential diagnosis of male specimens of C. australe n. sp. enabled the detection of differences in a number of characters, including spicule length, peculiar shape of male tail, paracloacal papillae disposition, and shape and bifurcation depth of interlabia. According to the genetic and morphological results obtained, the erection of a new taxon from fish-eating birds of the Austral region is given and its formal description is presented. Phylogenetic trees support both C. australe n. sp. and C. chubutensis as being included in the same clade with the previously detected species from cormorants, i.e., C. rudolphii A, B, C, and C. septentrionale. The finding of C. australe n. sp. and C. chubutensis parasites of Ph. brasilianus and Ph. atriceps, respectively, appears to support a host-parasite association between the C. rudolphii A, B, and C, C. septentrionale, C. chubutensis, and C. australe n. sp. and different species of cormorants belonging to Phalacrocorax
Fig. 6. BMNH R.958 in A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan
No full textFig. 6. BMNH R.958, referred to Hardella thurgi (Gray, 1831) by Lydekker (1889b, under the number BMNH R.954), here identified as Palatochelydia indet. A. Photograph of carapace. B. Illustration of carapace. C. Photograph of carapace in lateral view. D. Illustration of carapace in lateral view. E. Photograph of plastron. F. Illustration of plastron. Scale bar: 3 cm.Published as part of Garbin, Rafaella C., Bandyopadhyay, Saswati & Joyce, Walter G., 2020, A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan, pp. 1-67 in European Journal of Taxonomy 652 on page 10, DOI: 10.5852/ejt.2020.652, http://zenodo.org/record/386023
Hardella Gray 1870
No full textGenus Hardella Gray, 1870 Type species Hardella thurjii (Gray, 1831a). Differential osteological diagnosis using shell characters See Hardella thurjii below.Published as part of Garbin, Rafaella C., Bandyopadhyay, Saswati & Joyce, Walter G., 2020, A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan, pp. 1-67 in European Journal of Taxonomy 652 on page 28, DOI: 10.5852/ejt.2020.652, http://zenodo.org/record/386023
Morphological variation in the Brazilian Radiated Swamp Turtle Acanthochelys radiolata (Mikan, 1820) (Testudines: Chelidae)
No full textGarbin, Rafaella C., Karlguth, Deborah T., Fernandes, Daniel S., Pinto, Roberta R. (2016): Morphological variation in the Brazilian Radiated Swamp Turtle Acanthochelys radiolata (Mikan, 1820) (Testudines: Chelidae). Zootaxa 4105 (1), DOI: 10.11646/zootaxa.4105.1.
Melanochelys sivalensis Garbin & Bandyopadhyay & Joyce 2020, comb. nov.
No full textMelanochelys sivalensis (Theobald, 1877) comb. nov. Figs 27–31 Bellia sivalensis Theobald, 1877: 44. Clemmys hydaspica Lydekker, 1885a: 172. Clemmys theobaldi Lydekker, 1885a: 173. Clemmys punjabiensis Lydekker, 1885a: 175. Geoemyda trijuga Smith, 1931: 97 (part). Geoemyda sivalensis Smith, 1931: 89. Melanochelys trijuga indopeninsularis TEWG, 2015: e.46. Bellia theobaldi – Lydekker 1889a: 58. Clemmys sivalensis – Lydekker 1885a: 171. Bellia sivalensis – Lydekker 1889a: 58. Type IM E.88, the anterior half of a fossil shell (Fig. 27). Material examined PAKISTAN • 1 specimen, holotype of Bellia sivalensis; Punjab, south of Jhand; Middle to Upper Siwalik group of Potwar Plateau; Miocene–Pliocene; IM E.88 • 1 specimen, holotype of Clemmys theobaldi; Punjab, Jhand; Middle to Upper Siwalik group of Potwar Plateau; Miocene–Pliocene; IM E.89 • 1 specimen; Punjab, Potwar Plateau; Middle to Upper Siwalik group of Potwar Plateau; Miocene– Pliocene; IM E.90 • 1 specimen, holotype of Clemmys punjabiensis; Punjab; Middle to Upper Siwalik group of Potwar Plateau; Miocene–Pliocene; IM E.92 • 1 specimen, holotype of Clemmys hydaspica; Punjab, Jhelum district; Middle to Upper Siwalik group of Potwar Plateau; Miocene–Pliocene; IM E.93. Type locality and horizon Miocene/Pliocene, Middle to Upper Siwaliks of Potwar Plateau, south of Jhand, Punjab, Pakistan (see Comments below). Range Miocene/Pliocene, Middle to Upper Siwaliks of Potwar Plateau, Punjab, Pakistan. Differential osteological diagnosis using shell characters Melanochelys sivalensis can be differentiated from other species of Melanochelys by the lack of longitudinal carapacial keels, the presence of hexagonal second to fourth vertebral scutes with concave posterolateral margins that are broader than long and a denser and more rounded shell. Description of material examined IM E.88 (Fig. 27), holotype of Bellia sivalensis – This is the anterior half of a shell from the Miocene/ Pliocene, Middle to Upper Siwaliks of Potwar Plateau, south of Jhand, Punjab, Pakistan (see Comments below), initially figured and described by Lydekker (1885a: pl. 20.1). Our observations of the specimen mostly agree with those of Lydekker, although we document more details in the plastron. Most scutes are clearly visible, but only a few bony sutures are apparent. There are no signs of carapacial keels, but notches on the intervertebral sulci indicate the former presence of keels as a juvenile. This is clearly an adult specimen due to its large size (carapace length greater than 20 cm). Growth annuli marks are present on the anterior marginal scutes. The cervical scute is extremely reduced and clasped between the first marginals. First vertebral scute is longer than wide. The second and third vertebrals have rounded lateral margins. The plastron not well preserved, with few visible sutures. The anterior margin of the plastron is straight and the gular scutes are much longer than wide. IM E.89 (Fig. 28), holotype of Clemmys theobaldi – This is the anterior half of a shell from the Miocene/ Pliocene, Middle to Upper Siwaliks of Potwar Plateau, Jhand, Punjab, Pakistan (see Comments below) originally figured by Lydekker (1885a: pl. 20.2). Our illustrations mostly agree with those of Lydekker, but we disagree in the presence of a cervical and document the plastron for the first time. Most scutes are clearly visible, but only a few bones are apparent. It is clearly an adult specimen due to its large size (carapace length greater than 20 cm). There are no signs of carapacial keels or growth annuli marks. The cervical scute is present and as long as wide. The first vertebral scute is wider than long and exhibits an anterolateral constriction. The second and third vertebrals have rounded lateral margins. The anterior margin of the plastron is straight and lacks a median notch. The gular scutes are much longer than wide and completely intersect the entoplastron. The humeropectoral sulcus completely crosses the entoplastron posteriorly. The pectoro-abdominal sulcus does not intersect the hyo-hypoplastral suture. IM E.90 (Fig. 29) – This is a nearly complete, previously unfigured shell from the Miocene/Pliocene, Middle to Upper Siwaliks of Potwar Plateau, Punjab, Pakistan. Old ontogenetic age combined with poor preservation of the surface makes it near impossible to discern most scutes and sutures. There are no signs of carapacial keels or growth annuli marks. The cervical scute is extremely reduced and placed between the first marginals. The gular scutes are much longer than wide. IM E.92 (Fig. 30), holotype of Clemmys punjabiensis – This specimen was collected from the Miocene/ Pliocene, Middle to Upper Siwaliks of Potwar Plateau, Punjab, Pakistan, and was initially figured and described by Lydekker (1885a: pl. 20.3). Our observations of this specimen overall confirm those of Lydekker, although we document some addition sutures. The specimen represents the anterior half of a carapace and articulated fragments of the plastron, and likely represents an adult specimen due to its larger size (carapace length greater than 15 cm). Scutes are clearly discernable, but sutures are restricted to the periphery of the specimen. No carapacial keels or growth annuli marks are visible. The first vertebral scute is as long as wide and has an anterolateral constriction. The second and third vertebral scutes have semi-sinuous lateral margins. The anterior plastral margin is concave. The gular scute is longer than wide. The pectoro-abdominal sulcus does not intersect the hyo-hyoplastral suture. IM E.93 (Fig. 31), holotype of Clemmys hydaspica – This specimen consists of a nearly complete carapace and an articulated partial plastron from the Miocene/Pliocene, Middle to Upper Siwaliks of Potwar Plateau, Jhelum district, Punjab, Pakistan. The figures provided by Lydekker (1885a: pl. 20.4) overall agree with our figure, although we see more details in some areas, but less in others. This is a well-preserved specimen that clearly documents most sulci, but only some sutures. It is likely an adult specimen due to its large size (carapace length greater than 15 cm). The plastron is highly damaged and provides no information and we therefore do not figure it. There are no signs of carapacial keels or growth annuli marks. The first vertebral scute is wider than long and has straight lateral margins. The second and third vertebral scute have convex anterolateral and concave posterolateral sides. The sulcus between the first and second pleural, and the second and third pleural contact the fourth and sixth marginal scutes, respectively. The first neural bone only contacts the second costal on the right side, which is probably an anomaly. Comments Two of five specimens listed in this section originate from “south of Jhand” (Lydekker 1885a). We were able to locate three places called J(h)and in the Punjab of Pakistan and India: the large town of J(h)and in Attock District, Pakistan, the village of J(h)and in Chakwal District, Pakistan and the village of J(h) and in Jalandhar District, India. The two locations in Pakistan are surrounded by sedimentary exposures that have yielded fossils of Siwaliks age, while the Indian location is located in a flood plain lacking such exposures. We therefore are highly confident that the type locality is positioned in the Punjab of Pakistan. See Discussion for further details regarding the referral of this material to Melanochelys sivalensis.Published as part of Garbin, Rafaella C., Bandyopadhyay, Saswati & Joyce, Walter G., 2020, A taxonomic revision of geoemydid turtles from Siwalik-age of India and Pakistan, pp. 1-67 in European Journal of Taxonomy 652 on pages 40-47, DOI: 10.5852/ejt.2020.652, http://zenodo.org/record/386023
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