328,669 research outputs found
Le attività in Africa di Mario Pavan e dell’Istituto di Entomologia dell’Università di Pavia.
No full textEntomologo e studioso di fama internazionale, Mario Pavan ha dedicato la sua carriera
professionale allo studio e alla conservazione dell’ambiente naturale. Tra gli anni Cinquanta e gli anni
Novanta del Novecento ha guidato spedizioni in numerosi Paesi Africani anche per incarico del Governo
Italiano e di organizzazioni internazionali al fine di studiare i rapporti tra le popolazioni indigene
e il loro ambiente, sviluppare politiche di conservazione dell’ambiente, studiare l’entomofoauna, e
sviluppare rapporti di collaborazione scientifica fra l’Università degli Studi di Pavia e le istituzioni
locali. Fra i campioni entomologici raccolti nei suoi viaggi, ora depositati nelle collezioni del Museo di
Storia Naturale dell’Università degli Studi di Pavia, sono stati riconosciuti numerosi nuovi taxa, alcuni
dei quali a lui dedicati
Monodelphis (Mygalodelphys) pinocchio Pavan 2015
No full textMonodelphis (Mygalodelphys) pinocchio Pavan, 2015 TYPE MATERIAL AND TYPE LOCALITY: MN 78680, the holotype by original designation, consists of the skin, skull, and postcranial skeleton of an adult male collected at the Reserva Forestal do Morro Grande (23.06° S, 46.92° W), São Paulo state, Brazil. SYNONYMS: None (but see Remarks for unavailable or informal names by which this species was previously known). DISTRIBUTION: Monodelphis pinocchio occurs in montane forests from about 790 to 2400 m in southeastern Brazil, where it has been collected in the states of Espírito Santo, Rio de Janeiro, Minas Gerais, and São Paulo (Pavan, 2015: fig. 2). REMARKS: See Pavan (2015) for illustrations, measurements, and morphological comparisons with other species in the subgenus Mygalodelphys. This is a morphologically distinctive species that was recognized as such long before it was formally described. It was previously called “ Monodelphis macae ” (an unavailable manuscript name) by Gomes (1991), “ Monodelphis [species E]” by Pine and Handley (2008), and “ Monodelphis species 1 ” by Pavan et al. (2014).Published as part of Voss, Robert S., 2022, An Annotated Checklist Of Recent Opossums (Mammalia: Didelphidae), pp. 1-77 in Bulletin of the American Museum of Natural History 2022 (455) on page 28, DOI: 10.1206/0003-0090.455.1.1, http://zenodo.org/record/716137
Monodelphis (Pyrodelphys) Pavan & Voss 2016, new subgenus
No full textPyrodelphys, new subgenus TYPE SPECIES: Monodelphis emiliae (Thomas, 1912). CONTENTS: emiliae Thomas, 1912. DIAGNOSIS: Dorsal body pelage with grayish midbody contrasting with reddish head and rump (fig. 14A); ventral pelage uniformly colored (without self-whitish median markings), yellowish or orangish on museum skins, but much brighter in life (fig. 14B). Mammae 2–1–2 = 5 (MZUSP 35064), 3–1–3 = 7 (MPEG JUR 79), or 4–1–4 = 9 (MPEG 39106, 39182, 42955), all abdominal-inguinal. Thenar and first interdigital pad of pes usually fused or in contact; hypothenar pad of pes usually present. 8 Body pelage extends onto tail farther dorsally than ventrally, or to about the same extent dorsally and ventrally; tail scales arranged in annular series. Infraorbital foramen dorsal to M1; frontal process of jugal present but rounded, not distinctly angular; parietal usually (ca. 80% of examined specimens) in contact with mastoid; incisive foramina usually short; maxillopalatine fenestrae short; sphenorbital fissure large, exposing basisphenoid in lateral view; infratemporal crest of alisphenoid distinct; secondary foramen ovale present or absent; tympanic wing of alisphenoid large; tip of anterior process of malleus not exposed on external bullar surface; rostral tympanic process of petrosal broad and rounded, concealing fenestra cochleae in ventral view; stapes columelliform, imperforate or microperforate; subsquamosal foramen small. Anterior cingulids of m2 and m3 broad; entoconids of m1–m3 distinct; dp3 small, with incomplete trigonid and indistinct anterior cingulid. a Differs among member species. b Intraspecific variation. COMPARISONS: Pyrodelphys is uniquely distinguished from other subgenera of Monodelphis by fusion or contact between the thenar and first interdigital pads of the hind foot (the thenar and first interdigital are separate in members of other subgenera) and by having a small subsquamosal foramen (the subsquamosal foramen is distinctly larger in members of other subgenera. Among other diagnostic comparisons (table 2), Pyrodelphys is additionally distinguished from the subgenus Monodelphis by having a reddish head and rump separated by a grayish midbody, an infraorbital foramen dorsal to M1, large alisphenoid tympanic wing, unexposed tip of the anterior process of the malleus, broadly rounded rostral tympanic process of the petrosal, columelliform stapes, and smaller dp3. Pyrodelphys is additionally distinguished from Microdelphys by lacking dorsal stripes in all age-sex classes, by lacking a distinctly angular frontal process of the jugal, and by having a distinct infratemporal crest of the alisphenoid. Pyrodelphys is also distinguished from Monodelphiops by its dorsal pelage pattern, by lacking pectoral mammae, and by having tail scales in annular series, a large alisphenoid tympanic wing, and a broadly rounded rostral tympanic process of the petrosal. Diagnostic comparisons between Pyrodelphys and Mygalodelphys have already been provided (see above). ETYMOLOGY: From pyr, ancient Greek for “fire,” in reference to the flame-colored underparts of living and freshly dead specimens of this clade (fig. 14B). REMARKS: This taxon is widely divergent from other clades in the genus Monodelphis and appears to represent an ancient lineage with no close extant relatives (Pavan et al., 2014; Pavan et al., 2016). NOTES ON DISTRIBUTION AND SYMPATRY: Monodelphis (Pyrodelphys) emiliae is known from southwestern and southeastern Amazonia (table 3), where it ranges from near the base of the Andes in Peru and Bolivia to eastern Pará, Brazil. Based on geographic range overlap and published reports of cooccurring species (e.g., in the lower Urubamba region of eastern Peru; Solari et al., 2001), Pyrodelphys may occur sympatrically with species of the subgenera Mygalodelphys and/or Monodelphis throughout its geographic range.Published as part of Pavan, Silvia E. & Voss, Robert S., 2016, A Revised Subgeneric Classification of Short-tailed Opossums (Didelphidae: Monodelphis), pp. 1-44 in American Museum Novitates 2016 (3868) on pages 22-24, DOI: 10.1206/3868.1, http://zenodo.org/record/459843
Monodelphis (Monodelphis) arlindoi Pavan 2012
No full textMonodelphis (Monodelphis) arlindoi Pavan et al., 2012 TYPE MATERIAL AND TYPE LOCALITY: MPEG 38052, the holotype by original designation, consists of the skin, skull, and preserved tissues of an adult male collected at Platô Grieg (1.83° S, 56.42° W; 160 m), 43 km SW Porto Trombetas, Pará state, Brazil. SYNONYMS: None. DISTRIBUTION: Monodelphis arlindoi occurs in lowland rainforest in central and southern Guyana and Brazil; in Brazil, it occurs north of the Amazon in southeastern Roraima, eastern Amazonas, and northern Pará (Pavan et al., 2012: fig. 6) REMARKS: Monodelphis arlindoi is one of three species currently recognized within what was once considered to be M. brevicaudata (e.g., by Voss et al., 2001; Pine and Handley, 2008).Published as part of Voss, Robert S., 2022, An Annotated Checklist Of Recent Opossums (Mammalia: Didelphidae), pp. 1-77 in Bulletin of the American Museum of Natural History 2022 (455) on page 23, DOI: 10.1206/0003-0090.455.1.1, http://zenodo.org/record/716137
(Mygalodelphys) Pavan & Voss 2016, new subgenus
No full text<i>Mygalodelphys</i>, new subgenus <p> TYPE SPECIES: <i>Monodelphis adusta</i> (Thomas, 1897).</p> <p> CONTENTS: <i>adusta</i> Thomas, 1897 (including <i>melanops</i> Goldman, 1912); <i>peruviana</i> Osgood, 1913; <i>osgoodi</i> Doutt, 1938; <i>kunsi</i> Pine, 1975; <i>reigi</i> Lew and Pérez-Hernández, 2004; <i>ronaldi</i> Solari, 2004; <i>handleyi</i> Solari, 2007; and <i>pinocchio</i> Pavan, 2015.</p> <p> DIAGNOSIS: Dorsal body pelage unpatterned; ventral pelage uniformly colored or with self-whitish median markings. 5 Mammae 2–0–2 = 4 (e.g., in <i>M. peruviana</i>; AMNH 264562), 3–0–3 = 6 (e.g., in <i>M. adusta</i>; AMNH 202650), or 3–1–3 = 7 (e.g., in <i>M. pinocchio</i>; MZUSP MTR15815), all abdominal-inguinal. Thenar and first interdigital pad of pes separate, not fused; hypothenar pad of pes present (but unknown for <i>M. reigi</i>, <i>M. peruviana</i>, and <i>M. ronaldi</i>). Body pelage extends onto tail farther ventrally than dorsally; tail scales arranged in annular or spiral series. Infraorbital foramen dorsal to M1; frontal process of jugal absent or indistinct; parietal usually (> 90% of examined specimens) not in contact with mastoid; length of incisive foramina variable; length of maxillopalatine fenestra variable; sphenorbital fissure small (basisphenoid laterally concealed); infratemporal crest of alisphenoid distinct or indistinct; secondary foramen ovale usually absent 6; tympanic wing of alisphenoid small; tip of anterior process of malleus exposed on external bullar surface between ectotympanic and alisphenoid; rostral tympanic process of petrosal narrow and triangular, not concealing fenestra cochleae in ventral view; stapes columelliform, imperforate or microperforate; subsquamosal foramen large. Anterior cingulids of m2 and m3 narrow; entoconids of m1–m3 very small, indistinct; dp3 small, with incomplete trigonid and indistinct anterior cingulid in some species (e.g., <i>M. adusta</i>, <i>M. reigi</i>), but dp3 large, with complete trigonid and distinct anterior cingulid in other species (e.g., <i>M. handleyi</i>; the morphology of dp3 is unknown for <i>M. peruviana</i>, <i>M. osgoodi</i>, <i>M. ronaldi</i>, <i>M. pinocchio</i>, and <i>M. kunsi</i>).</p> <p> COMPARISONS: Members of the subgenus <i>Mygalodelphys</i> differ from currently recognized species in other subgenera of <i>Monodelphis</i> by several unique external and craniodental traits, including: (1) soπ body pelage that extends onto the tail farther ventrally than dorsally; (2) frontal process of jugal absent or indistinct; (3) parietal-mastoid contact absent; (4) a small sphenorbital fissure that does not expose the basisphenoid to lateral view; (5) narrow lower molar anterior cingulids; and (6) indistinct entoconids on m1–m3. Self-whitish midventral pelage markings are also unique to <i>Mygalodelphys</i>, although they are oπen polymorphic and are not present in all member species.</p> <p> Among other diagnostic comparisons (table 2), <i>Mygalodelphys</i> additionally differs from <i>Pyrodelphys</i> by its unpatterned dorsal pelage, separate thenar and first interdigital pads on the hind foot, small alisphenoid tympanic wing, exposure of the anterior process of the malleus on the external surface of the bulla, narrow-triangular rostral tympanic process of the petrosal, and a large subsquamosal foramen. <i>Mygalodelphys</i> additionally differs from the usual morphology seen in the nominotypical subgenus by possessing a distinct hypothenar pad on the hindfoot, an infraorbital foramen that is dorsal to M1, and a columelliform stapes. <i>Mygalodelphys</i> additionally differs from <i>Microdelphys</i> by its consistently unpatterned dorsal pelage, small alisphenoid tympanic wing, exposure of the anterior process of the malleus on the external surface of the bulla, and narrow-triangular rostral tympanic process of the petrosal. <i>Mygalodelphys</i> additionally differs from <i>Monodelphiops</i> by its unpatterned dorsal pelage, lack of pectoral mammae, and possession of a hypothenar pad of the hind foot.</p> <p> 5 Self-whitish ventral markings were observed on all examined specimens of <i>M. handleyi</i>, most examined specimens of <i>M. adusta</i> and <i>M. peruviana</i>, and a few specimens of <i>M. kunsi</i>. They were not observed in <i>M. osgoodi</i>, <i>M. pinocchio</i>, <i>M. reigi</i>, or <i>M. ronaldi.</i></p> <p> 6 A few specimens of <i>M. kunsi</i> (<10% of those examined) have a complete bullar lamina forming a secondary foramen ovale on one side of the skull.</p> <p> ETYMOLOGY: From <i>mygale</i>, ancient Greek for “shrew,” which members of this clade strikingly resemble in general aspect.</p> <p> REMARKS: <i>Mygalodelphys</i> corresponds to “clade E” or the “Adusta Group” (Pavan et al., 2014; Pavan et al., 2016), which was recovered with consistently robust support in our previous phylogenetic analyses. Although taxon-dense phylogenetic analyses incorporating morphological characters have yet to be done, it seems likely that several features unique to this subgenus (e.g., body pelage extending onto the tail farther ventrally than dorsally; frontal process of the jugal absent or indistinct; no parietal-mastoid contact; narrow lower molar anterior cingulids) will eventually be found to optimize as subgeneric synapomorphies.</p> <p> Phylogenetic analyses based on mitochondrial and nuclear gene sequences (Pavan et al., 2014; Vilela et al., 2015; Pavan et al., 2016) have consistently recovered a basal dichotomy among the species that we refer to <i>Mygalodelphys</i>: one clade including <i>Monodelphis kunsi</i> and <i>M. pinocchio</i> (<i>M.</i> “species 1” of Pavan et al., 2014; Vilela et al., 2015), and another including <i>M. adusta, M. reigi, M. peruviana, M. osgoodi, M. handleyi,</i> and a still-undescribed form (<i>M.</i> “species 2”). Although these clades are robustly supported by sequence data, morphological data does not support their formal taxonomic recognition. Despite being sister taxa, <i>M. pinocchio</i> and <i>M. kunsi</i> are externally and cranially dissimilar (Pavan, 2015), and we are not aware of any phenotypic trait shared by these two species that consistently distinguish them from the remaining species of <i>Mygalodelphys</i>.</p> <p> Although <i>Monodelphis ronaldi</i> has not been included in any phylogenetic analysis to date, we allocate this species to the subgenus <i>Mygalodelphys</i> based on its close phenetic similarity to <i>M. handleyi</i> (previously noted by Solari, 2007) and to its shared possession of morphological traits that seem likely to optimize as subgeneric synapomorphies, including (1) lack of a distinct frontal process of the jugal, (2) a small sphenorbital fissure within which the basisphenoid is not laterally exposed, (3) lack of parietal-mastoid contact, and (4) narrow anterior cingulids on m2 and m3. Including <i>M. ronaldi</i> in future phylogenetic analyses will effectively test the hypothesis that it is a member of <i>Mygalodelphys</i>.</p> <p> NOTES ON DISTRIBUTION AND SYMPATRY: Species of the subgenus <i>Mygalodelphys</i> are known from eastern Panama; the humid tropical and subtropical Andes (to ca. 3000 m) of Colombia, Ecuador, Peru, and Bolivia; the Guiana Highlands of southern Venezuela and western Guyana; western and southeastern Amazonia 7; the Atlantic Forest of southeastern Brazil; the Cerrado landscapes of central Brazil; and the Cerrado, Chaco, and adjacent dry-forested biomes of Bolivia, Paraguay, and northeastern Argentina (table 3). Species of <i>Mygalodelphys</i> are sympatric with <i>Pyrodelphys</i> in southwestern and southeastern Amazonia (e.g., in the lower Urubamba region of eastern Peru; Solari et al., 2001), with species of the subgenus <i>Monodelphis</i> in Amazonia and the Cerrado (e.g., at Bosque Mbaracayú in eastern Paraguay; de la Sancha et al., 2007), with species of the subgenus <i>Microdelphys</i> in the Andes and the Atlantic Forest (e.g., at Riacho Grande, São Paulo, southeastern Brazil; Pavan, 2015), and with species of <i>Monodelphiops</i> in the Atlantic Forest (e.g., at Parque Nacional do Itatiaia, southeastern Brazil; Pavan, 2015).</p> <p> 7 The southeastern Amazonian representative of <i>Mygalodelphys</i> is the still-undescribed “species 2” of Pavan et al. (2014).</p> <p> Given this wide distribution and extensive sympatry, the absence of <i>Mygalodelphys</i> throughout most of northeastern Amazonia (north of the Amazon and east of the Rio Negro), where only species of the nominotypical subgenus are known to occur in lowland habitats, is noteworthy. It is also worth noting that <i>Mygalodelphys</i> is the only subgenus known to occur in the northern Andes (north of the Huancabamba Deflection), and in northwestern Amazonia (north of the upper Amazon and west of the Rio Negro). Whether historical or ecological factors account for such distributional phenomena is unknown.</p>Published as part of <i>Pavan, Silvia E. & Voss, Robert S., 2016, A Revised Subgeneric Classification of Short-tailed Opossums (Didelphidae: Monodelphis), pp. 1-44 in American Museum Novitates 2016 (3868)</i> on pages 19-22, DOI: 10.1206/3868.1, <a href="http://zenodo.org/record/4598434">http://zenodo.org/record/4598434</a>
Monodelphis (Pyrodelphys) Pavan and Voss 2016
No full textSubgenus <i>Pyrodelphys</i> Pavan and Voss, 2016 <p> TYPE SPECIES: <i>Peramys emiliae</i> Thomas, 1912, by original designation.</p> <p>SYNONYMS: None.</p> <p>REMARKS: See Pavan and Voss (2016) for a morphological diagnosis of this distinctive taxon, which includes only a single currently recognized species.</p>Published as part of <i>Voss, Robert S., 2022, An Annotated Checklist Of Recent Opossums (Mammalia: Didelphidae), pp. 1-77 in Bulletin of the American Museum of Natural History 2022 (455)</i> on page 29, DOI: 10.1206/0003-0090.455.1.1, <a href="http://zenodo.org/record/7161371">http://zenodo.org/record/7161371</a>
Transparency of Information and Coordination in Economies with Investment Complementarities
No full textDrosophila bromelioides Pavan and Cunha 1947
No full text<i>Drosophila bromelioides</i> Pavan and Cunha, 1947 <p> <i>Drosophila bromelioides</i> Pavan and Cunha, 1947: 24. Val (1982): redescription (male genitalia).</p> <p> DIAGNOSIS: Yellow to pale brown, average thorax length 1.02 (♂) to 1.14 (♀) mm; arista with 4-2 dorsal-ventral branches; most similar to <i>bromeliae</i> Sturtevant but differs most notably by the aedeagal shaft in <i>bromelioides</i> nearly straight in lateral view (vs. acutely bent, sometimes at 90°); distiphallus slightly shorter, wider, anteroventral margin more lobate in <i>bromelioides</i>; oviscapt 300–320 µm, spermatheca higher than wide, introvert ca. 0.6× capsule length.</p> <p>DESCRIPTION: See Pavan and Cunha (1947) (external, internal soft organs, immatures, chromosomes), redescription by Schmitz (2010) (especially genitalia).</p> <p>TYPE: Not reported by Pavan and Cunha (1947).</p> <p>DISTRIBUTION: Southern Brazil, states of Rio Grande do Sul, Santa Catarina, Parańa, São Paul, Goías, Minas Gerais, Bahia (summarized in Schmitz, 2010).</p> <p> COMMENTS: A highly polyphagous species, taken/reared from 42 species of flowers in 16 families (Schmitz, 2010). Like <i>D. bromeliae</i>, this species can, with care, be cultured on standard lab medium (Schmitz, 2010).</p>Published as part of <i>Grimaldi, David A., 2016, Revision of the Drosophila bromeliae Species Group (Diptera: Drosophilidae): Central American, Caribbean, and Andean Species, pp. 1-56 in American Museum Novitates 2016 (3859)</i> on page 24, DOI: 10.1206/3859.1, <a href="http://zenodo.org/record/5368683">http://zenodo.org/record/5368683</a>
Local electric field perturbations due to trapping mechanisms at defects: What random telegraph noise reveals
No full textAs devices scale closer to the atomic size, a complete understanding of the physical mechanisms involving defects in high-kappa dielectrics is essential to improve the performance of electron devices and to mitigate key reliability phenomena, such as Random Telegraph Noise (RTN). In fact, crucial aspects of defects in HfO2 are still under investigation (e.g., the presence of metastable states and their properties), but it is well known that oxygen vacancies (V(+)s) and oxygen ions (O(0)s) are the most abundant defects in HfO2. In this work, we use simulations to gain insights into the RTN that emerges when a constant voltage is applied across a TiN/(4 nm)HfO2/TiN stack. Signals exhibit different RTN properties over bias and, thus, appear to originate from different traps. Yet, we demonstrate that they can be instead promoted by the same O(0)s which change their capture (tau(c)) and emission (tau(e)) time constants with the applied bias, which, in turn, changes the extent of their electrostatic interactions with the traps that assist charge transport (V(+)s). For a certain bias, RTN is given by the modulation of the trap-assisted current at V(+)s induced by trapping/detrapping events at O(0)s, which are, in turn, influenced by the bias itself and by trapped charge at nearby O(0)s. In this work, we demonstrate that accounting for the effect of trapped charge is essential to provide accurate estimation of the RTN parameters, which allow us to retrieve information about traps and to explain key mechanisms behind complex RTN signals
Dr S Pavan Kumar
No full textDr S Pavan Kumar is an Associate Professor in the School of Humanities, Social Sciences and Management, NITK Surathkal, Karnataka. His educational qualifications include Diploma in Electrical & Electronics Engineering from Govt. Polytechnic affiliated to SBTET, Hyderabad. B.E. in Computer Science & Engineering from Amravati University. M.Tech. in Human Resource Development & Management from IIT Kharagpur in 2006. Doctorate in Human Resource Development & Management from IIT Kharagpur in 2011. He has done several other modern-day courses to keep himself updated with the technology and trend. It includes a certificate course in Business Analytics from Manipal global university and a P.G. Diploma in Geo-spatial technologies for rural development from NIRDPR, Govt of India etc. Dr Kumar has gained rich experience of approximately 25 years in academic institutions as academician, consultancy organizations as a consultant, a Govt. enterprise as a trainee etc. His notable experiences, to name a few, are as follows: He has served as Vice-principal for Kshatriya college of engineering, affiliated with JNT University Hyderabad, before joining NITK Surathkal. Dr Kumar joined NITK Surathkal in 2012 and has been serving to date. In his tenure to date, he played several academic and administrative roles. He served as Head of the department during 2018-2021. He is also serving as the secretary for NITK English medium school run by the professors of the NITK Surathkal. Regarding academic achievements, Dr S P Kumar has received many best research paper awards for his contribution in several national and international conferences. So far, he has published approximately forty research papers in referred journals. He had presented approximately 35 papers at conferences of repute. Dr Kumar completed 3 PhD guidance as on date, and six scholars are currently doing PhD under his supervision. Around 25 MBA students have completed their project work under his guidance. Dr Kumar visited international universities located in countries like Switzerland, Spain for research interaction. Dr Kumar regularly conducts workshops on contemporary topics in various universities as part of outreach activities. A few universities where Dr Kumar has conducted events are Kongu engineering college, Rajagiri college of social sciences, IIT Kharagpur extension center etc. He also serves as a member of the board of studies for management programs as an academic expert. A few notable ones are S.R. University Warangal, PSG Coimbatore etc. He is a reviewer for a few journals for repute. He is also on the advisory board of a few start-up companies. He acted as an examiner for several PhD thesis evaluations. Dr Kumar regularly sets question papers for various premier universities of the country. Dr Kumar’s research interests include organizational development, Human resource management & development, Organizational behavior etc.https://www.interscience.in/mentors/1110/thumbnail.jp
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