793 research outputs found
Review of "Homer and the Question of Strife from Erasmus to Hobbes" by Jessica Wolfe
No full textJessica Wolfe. Homer and the Question of Strife from Erasmus to Hobbes. Toronto: University of Toronto Press, 2015. xvii + 607 pp. + 10 illus. $110.00. Review by William E. Engel, Sewanee: The University of the South
Stilbochlora wedmanorum Engel 2019, new species
No full textStilbochlora wedmanorum Engel, new species (Figs. 5–7, 14, 18) ZooBank: urn:lsid:zoobank.org:act: 1C4305F5-1F24-42D0-AEB3-E037B7AA6C34 DIAGNOSIS: As in all of the new species reported herein, this species has a more densely striate propodeum relative to the type species of the genus. Unlike S. graceae and S. kateae, however, the striae only extend to about midlength and the striate area is roughly crescent shape (Figs. 14, 18). Like S. kateae, this species is predominantly blue, with dark brown legs and clypeal apex (Figs. 5–7). DESCRIPTION: ♀: Total body length 6.74 mm; forewing length 4.68 mm. Head slightly wider than long (length 1.60 mm, width 1.73 mm); distal half of clypeus projecting below lower tangent of compound eyes; frontal line carinate from approximately lower tangent of toruli to about one torular diameter above upper tangent of toruli; upper interorbital distance 0.93 mm; lower interorbital distance 0.67 mm; ocellocular distance approximately 1.75× ocellar diameter. Scape long, extending to level of lateral ocelli; pedicel longer than first flagellomere; first and second flagellomeres subequal in length. Gena narrower than compound eye in profile. Mesoscutum with median and parapsidal lines moderately impressed, parapsidal line approximately 0.75× length of median line; intertegular distance 1.33 mm; mesoscutellum nearly twice as long as metanotum, approximately subequal to basal area of propodeum. Forewing with basal vein distad 1cu-a by 4× vein width; 1rs-m straight, confluent to slightly basad 1m-cu, roughly parallel to 2Rs; 3Rs subequal to r-rs, and subequal to 4Rs; 5Rs comparatively straight, thus marginal cell tapering uniformly to acutely rounded apex; 2M subequal to 3Rs; 3M more than 2× length 2M; 2rs-m nearly straight, distad 2m-cu by 5× vein width; hind wing with distal hamuli arranged 2-1-2. Inner metatibial spur with five branches, not including apical portion of rachis. Clypeus with coarse punctures separated by less than a puncture width centrally, puncture smaller and a bit more spaced near borders, integument between punctures faintly and finely coriarious to nearly smooth, coriarious integument more prominent in metallic areas; supraclypeal area with punctures smaller than on clypeus, separated by 2–5× a puncture width except denser above near intertorular area, integument between punctures weakly and finely coriarious; face below tangent of antennal toruli with minute punctures separated by a puncture width or less, integument between punctures smooth; face above tangent of antennal toruli with minute punctures nearly contiguous, integument between punctures smooth; punctures becoming more spaced toward ocellar area and in ocellocular area, in ocellocular area separated by 3–7× a puncture width, integument between punctures smooth; vertex with integument as described for ocellocular area; gena with punctures separated by 2–3× a puncture width, blending ventrally to coriarious integument of postgena; postgena prominently coriarious and impunctate. Pronotum smooth, with sparsely scatered punctures; mesoscutum with minute punctures separated by 2–5× a puncture width, not noticeably more closely spaced around parapsidal line, integument between punctures smooth; tegula smooth and impunctate except a few, sparsely scatered, weak punctures; mesoscutellum with integument as on central disc of mesoscutum except punctures more widely spaced, punctures along posterior border larger and weaker; metanotum minutely nodulose, integument otherwise finely coriarious; preëpisternum with coarse, shallow punctures nearly contiguous, integument between punctures smooth, hypoepimeral area with sparse, small punctures, otherwise smooth; mesepisternum with small, shallow punctures separated by 3–5× a puncture width; metepisternum smooth with sparsely scatered minute punctures; basal area of propodeum smooth, glabrous, shining, with prominent striae radiating from basal margin, striae short, extending to about midlength of basal area, striae not longer medially, striae closely spaced; lateral and posterior surfaces of propodeum smooth with scatered minute punctures, punctures of posterior surface sparser than those of lateral surface. Metasomal tergum I largely smooth, with scatered minute punctures, apical margin finely, weakly, transversely coriarious and impunctate; terga II–IV as on tergum I except minute punctures of disc more numerous, separated by 2–4× a puncture width, becoming weaker toward apical margin, apical margin as on tergum I; tergum V as on preceding terga except punctures more prominent and more closely spaced; sterna with basal areas smooth and impunctate, central discs finely coriarious and nodulose at setal bases. Mandible brown with reddish apex and lighter center; labrum brown; clypeus brown except metallic blue bordering epistomal sulcus; supraclypeal area and remainder of face brilliant metallic blue with greenish highlights in parocular area; gena as on face; postgena metallic blue-green; antenna dark brown except flagellomeres ventrally lighter, particularly apex and venter of distalmost flagellomere brownish yellow. Pronotum and propleuron dark brown with strong metallic blue highlights and weaker greenish highlights; mesoscutum brilliant metallic blue with greenish highlights; tegula brown, semi-translucent; mesoscutellum and metanotum as on mesoscutum; mes- and metepisternum as on mesoscutum; propodeum as on mesoscutum except greenish highlights lacking; legs largely brown except lighter on tarsi. Wing membranes hyaline and clear; veins dark brown to brown. Metasoma largely dark brown; terga with strong metallic blue highlights and areas of purplish highlights, highlights absent in marginal areas giving metasomal dorsum superficial banded appearance. Pubescence largely white to off white; face with scatered, fine, simple, suberect to erect setae, such setae intermingled with shorter, highly branched to plumose setae on lower face and along ocular borders, such setae not obscuring integument, on upper face fine, short, erect setae, setae becoming longer again on vertex and between ocelli; gena with setae as on vertex except long, erect to suberect setae, with a few apical branches, intermingled with shorter, plumose setae medially; postgena with sparse, elongate, erect setae, some setae with a few apical branches. Mesoscutum with scattered, short, fine, erect, simple setae, some with a few, minute branches, intermixed with shorter erect setae; mesoscutellum as on mesoscutum except intermixed with elongate setae with short branches, such setae most abundant posteriorly, laterally with scatered mid-sized, feathery setae; metanotum as on mesoscutum except elongate setae more numerous; pleura with long, erect to suberect, simple setae, such setae becoming slightly longer ventrally; basal area of propodeum glabrous; lateral and posterior surfaces with setae as on pleura except more numerous on lateral surface and sparser and more erect on posterior surface. Setae of legs largely white, except more yellowish on tarsomeres. Metasomal tergum I with long, erect, simple setae on anterior-facing surface, such setae becoming sparse, short, and more inclined medioapically, dorsal-facing surface with sparse, short, suberect setae, narrow apical margin glabrous; terga II–IV with fine, short, suberect to subappressed, simple setae, intermingled with longer, suberect, simple setae, such longer setae progressively more numerous on succeeding terga; tergum V with setae more numerous than on preceding terga and short setae of disc more fuscous; central discs of sterna with abundant, elongate, erect, simple setae, a few with short branches. ♂: Latet. HOLOTYPE: ♀, Peru: Madre de Dios, Cocha Salvador, Reserved Zone, Manu National Park, 310 m, 12°0’13’’S, 71°31’36’’W, 20–21 Oct 2000, R. Brooks, ex: flight intercept trap (SEMC). PARATYPES: 3♀♀, same data as holotype (SEMC). ETYMOLOGY: The specific epithet honors Scot D. and L. Kim Wedman, inspiring and supportive friends to the author and his spouse, Kellie.Published as part of Engel, Michael S., 2019, New species of the augochlorine bee genus Stilbochlora, with a preliminary key (Hymenoptera: Halictidae), pp. 1-15 in Journal of Melitology 2019 (89) on pages 8-14, DOI: 10.17161/jom.v0i89.11734, http://zenodo.org/record/805743
Strömende Medien und Energieträger
No full textPTB-Mitteilungen. Band 119 (2009), Heft 1, S. 3 - 49. ISSN 0030-834X1.:
Schwartz, Roman und Helmut Többen: Strömende Medien und Energieträger
2.:
Mickan, Bodo und Rainer Kramer: Metrologische Infrastruktur der PTB für die Gasmessung
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Müller, Harald, Volker Strunck, Norbert Pape und Jessica Kampe: LDA-Einsatz in der Strömungsmesstechnik
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Kramer, Rainer und Bodo Mickan: Gasmessung und Gaszählerprüfung in der Praxis
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Wendt, Gudrun, Rainer Engel und Jörg Riedel: Sicherstellung der Rückführbarkeit der Mengen- und Durchflussmessungen von Flüssigkeiten
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Rinker, Michael und Gudrun Wendt: Gesetzliches Messwesen im Bereich der Flüssigkeitsmesstechnik
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Rose, Jürgen und Thomas Lederer: Angewandte Wärmemengenmessung in strömenden Fluiden: Wärme- und Kältezähler
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Lederer, Thomas und Jürgen Rose: Durchflussmessung in Kraftwerken
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Sarge, Stefan M., Henning Wolf, Roland Schmidt und Harald Müller: Erneuerbare Energieträger ‒ Metrologische Herausforderungen bei Erzeugung und Handel
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Wolf, Henning, Rainer Kramer und Bodo Mickan: Mikrodurchfluss ‒ Flussraten im Bereich Mikroliter pro Minut
Onshore archives of tsunami deposits
No full textThe identification of paleotsunamis in the coastal geological record requires modern analogues to allow comparison. Much research has been undertaken recently on modern tsunami sedimentation patterns and processes. We describe here the principal coastal depositional settings in which modern (and older) finer-grained tsunami deposits have been identified. We then describe how this information on contemporary depositional processes has been used to identify ancient tsunami deposits in different stratigraphic contexts. We also highlight the importance of a range of different field methods that have been used to provide detailed information on the nature of tsunamis in (pre-)history.</p
Global and gene-specific histone modification profiles of mouse multipotent adult germline stem cells
No full textWe previously reported the generation of multipotent adult germline stem cells (maGSCs) from spermatogonial stem cells (SSCs) isolated from adult mouse testis. In a later study, we substantiated the pluripotency of maGSCs by demonstrating their close similarity to pluripotent male embryonic stem cells (ESCs) at the epigenetic level of global and gene-specific DNA methylation. Here, we extended the comparative epigenetic analysis of maGSCs and male ESCs by investigating the second main epigenetic modification in mammals, i.e. global and gene-specific modifications of histones (H3K4 trimethylation, H3K9 acetylation, H3K9 trimethylation and H3K27 trimethylation). Using immunofluorescence staining, flow cytometry and western blot analysis, we show that maGSCs are very similar to male ESCs with regard to global levels and nuclear distribution patterns of these modifications. Chromatin immunoprecipitation real-time PCR analysis of these modifications at the gene-specific level further revealed modification patterns of the pluripotency marker genes Oct4, Sox2 and Nanog in maGSCs that are nearly identical to those of male ESCs. These genes were enriched for activating histone modifications including H3K4me3 and H3K9ac and depleted of repressive histone modifications including H3K27me3 and H3K9me3. In addition, Hoxa11, a key regulator of early embryonic development showed the ESC-typical bivalent chromatin conformation with enrichment of both the activating H3K4me3 and the repressive H3K27me3 modification also in maGSCs. Collectively, our results demonstrate that maGSCs also closely resemble ESCs with regard to their chromatin state and further evidence their pluripotent nature
De stad als architectonische constructie: Het architectonisch discours van de stad (Duitsland 1871-1914)
No full textThe city as an architectural construction: The architectural discours on the city At the turn of the 19th to the 20th century a paradigm shift took place within German architectural thinking that can be identified as a turn to the city. Whereas throughout the 19th century architectural knowledge was primarily directed to questions of style of individual, monumental buildings, in the last quarter of that century the attention shifted towards the wider collection of buildings forming a part of a bigger unity, that is, building blocks of the city. Architectural questions were studied more and more in relation to the form of the city: its built, spatio-physical structure. It is argued in this book that, this interest shift from individual buildings to building ensembles indicates the emergence of a new architectural paradigm between 1871 and 1914 which is named here urban architecture. The development of this new architectural paradigm is traced down by analysing a large amount of city studies that appeared in the German speaking countries around 1900. This kind of studies focused on the form of the city from a strictly architectural perspective. It was through these architectural studies of the city that within a few decades an architectural discourse of the city was subsequently built up. This book focuses on the way in which the city as a built structure became an object of architectural study: the city as an architectural construction. For this purpose a genealogy of the rise and development of the German architectural discourse on the city is developed. The object of this study therefore belongs to the order of the discourse: a network of texts of architecture on the form of the city.Architectur
Harpur Palate, Volume 8 Issue 1, Summer 2008
No full textContributors: Jacob M. Appel | Devon Miller-Duggan | Salvatore Attardo | Rumit Pancholi | Blake Butler | W. Todd Kaneko | Jona Colson | Brian Russell | Patricia Engel | Patrick Carrington | Ron McFarland | Denise Duhamel | Sinduja Sathiyaseelan | Rumit Pancholi | Sharon Doyle | Charles Eldred, Hokusai, Albrecht Durer, Unknown, Luca Giordana, Benjamin West | John T. Tigonis | Amy Bracken Sparks | T. J. Forrester | Meg Franklin | Phoebe Reeves | Joseph J. Capista | Jim Daniels | Robert Long Foreman | Elizabeth Fogle | Jared Walls | Wendy Barker | Dave Peters | Michael Homolka | Micah Ling | Sara Kaplan | Jenny Hanning | Sandra M. Castillo | Rebecca Givens | Jessica Goodfello
Broad roads in a thin country - infrastructure concessions in Chile
No full textTo increase investment in infrastructure, in the early 1990s Chile's government introduced private capital into the transport infrastructure sector, covering roads and highways, bridges, tunnels, and airports. The chosen mechanism: a concession scheme through which private firms would finance and build a given project and then operate the infrastructure for a set of number of years, recovering their investment by collecting tolls from users. Among the lessons learned from the experience: 1) As much as possible, avoid concessioning roads for which there are convenient alternative freeways nearby. 2) Choose the right variable for awarding a concession. Avoid mechanisms that (by promoting large payments to the state or short-term concession periods) encourage high tolls, and if you choose to award a concession to the firm charging the lowest tolls, place a floor and ceiling on possible bids. The floor is to guarantee the concession's financial viability; the ceiling is to prevent inefficient traffic diversions. Ties at either end should be resolved by a second variable, such as the level of transfers between the state and the firm. 3) Allow downward toll flexibility so that the concessionaire can react to unexpectedly low traffic flows, especially for certain types of vehicles. 4) Pay special attention to the tendering mechanism and to the general incentive structure. There are limits to the pure least-present-value-of-revenue (LPVR) auction, but income guarantees do enhance liquidity. In fact, a minimum-income guarantee through an LPVR auction is an instrument for credit enhancement, not income support. Alternatively, some form of financial innovation should be encouraged to make debt service commitments more flexible. 5) If concessions are tendered by traditional methods and income guarantees will be given, cover only a fraction of the concessionaire's expected income stream, to reduce the state's financial exposure and to improve the incentives to the concessionaire. 6) Make the contracts as complete as possible but allow for later modifications or renegotiations, and include a well-designed dispute resolution mechanism.Banks&Banking Reform,Roads&Highways,Decentralization,International Terrorism&Counterterrorism,Public Sector Economics&Finance,Public Sector Economics&Finance,Roads&Highways,Airports and Air Services,Banks&Banking Reform,Toll Roads
FIGURE 12. A in Treatise on the Isoptera of the World
No full textFIGURE 12. A. The University of California, Berkeley's Faculty of Zoology in 1944, with three illustrious contributors to termite systematics, biology, and evolution among its staff: Charles A. Kofoid, Harold Kirby, and Sol F. Light. Front row (left to right): Richard Goldschmidt, S.J. Holmes, Kofoid, H.B. Torrey, and Kirby. Second row: E. Raymond Hall, J.E. Gullberg, Alden H. Miller, Light, and S. C. Brooks. Third row: Ray L. Watterson and Richard M. Eakin. B. Laura Hare, author of the Nasutitermitinae, the largest subfamily of termites.Published as part of <i>Krishna, Kumar, Grimaldi, David A., Krishna, Valerie & Engel, Michael S., 2013, Treatise on the Isoptera of the World, pp. 200-623 in Bulletin of the American Museum of Natural History 2704 (377)</i> on page 31, DOI: 10.1206/377.2, <a href="http://zenodo.org/record/10113630">http://zenodo.org/record/10113630</a>
Pluripotency of spermatogonial stem cells from adult mouse testis
No full textEmbryonic germ cells as well as germline stem cells from neonatal mouse testis are pluripotent and have differentiation potential similar to embryonic stem cells(1,2), suggesting that the germline lineage may retain the ability to generate pluripotent cells. However, until now there has been no evidence for the pluripotency and plasticity of adult spermatogonial stem cells (SSCs), which are responsible for maintaining spermatogenesis throughout life in the male(3). Here we show the isolation of SSCs from adult mouse testis using genetic selection, with a success rate of 27%. These isolated SSCs respond to culture conditions and acquire embryonic stem cell properties. We name these cells multipotent adult germline stem cells (maGSCs). They are able to spontaneously differentiate into derivatives of the three embryonic germ layers in vitro and generate teratomas in immunodeficient mice. When injected into an early blastocyst, SSCs contribute to the development of various organs and show germline transmission. Thus, the capacity to form multipotent cells persists in adult mouse testis. Establishment of human maGSCs from testicular biopsies may allow individual cell-based therapy without the ethical and immunological problems associated with human embryonic stem cells. Furthermore, these cells may provide new opportunities to study genetic diseases in various cell lineages
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