1,303 research outputs found
Additional dark G-band in the p-arm of chromosome 19 due to a paracentric inversion with a breakpoint in the pericentromeric heterochromatin
No full textParacentric inversions in chromosome 19 have rarely been described. Here we present an inv(19)(p11p13.1) with a breakpoint in the pericentromeric heterochromatin which leads to an additional dark G-band in the p-arm of chromosome 19. The rearranged chromosome segregated in two generations of a family without any phenotypic effects. A detailed characterization of the inv(19) by molecular cytogenetic techniques is presented. (C) 2001 Wiley-Liss, Inc
Legislação urbanística e ocupação do espaço: o caso do Campeche
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-graduação em Urbanismo, História e Arquitetura da cidadeO presente trabalho investiga a ocupação de um espaço da Ilha de Santa Catarina sob a ótica da legislação urbanística, buscando entender a ocupação urbana e a atuação ou não das leis. O estudo analisa o trecho sul do Campeche, distrito do município de Florianópolis localizado no sudeste da Ilha através dos aspectos ambientais preponderantes, suas legislações nas três esferas de competência, natureza jurídica e seu contexto espacial. A legislação, ao classificar a ocupação do espaço urbano de uma maneira geral, configura-se como instrumento que consolida uma proposta de moldagem da cidade e esta vai se concretizando a partir dessa interferência, não se configurando, portanto, somente como instrumento delimitador e ordenador do território, mas influenciando a maneira de viver dos habitantes. Com base na apreciação do Plano Diretor dos Balneários, lei que estabelece o zoneamento territorial dos balneários de Florianópolis fixa os objetivos, as diretrizes e as estratégias do desenvolvimento, verifica-se que inúmeras são as discrepâncias da realidade face à lei em vigor. A pesquisa permite constatar a veracidade de algumas premissas estabelecidas, como a de que este Plano Diretor tal qual se encontra atualmente, não cumpre com seus objetivos de modelação e ordenamento para a Ilha de Santa Catarina. Podemos afirmar, inclusive, que o plano juntamente com a omissão do Poder Público possibilitou o avanço de ocupações irregulares e ilegais, através de suas incoerências em relação a outras legislações e de seu próprio texto legal com seus anexos. The research investigates the occupation of a space in the Island of Santa Catarina on the light of urban legislation, trying to understand its urban occupation and the influence or not of the laws. The study addresses the south area of Campeche, a district of Florianópolis county, located in the Southeast of the Island through its main environmental aspects, its legislation in the three spheres of competence, its judicial nature, and its spatial context. Legislation, when classifying the occupation of urban space in a general way, configures itself as a tool that consolidates a moulding proposal for the city, and the city becomes concrete on the basis of such interference; hence it does not only configures itself as an instrument that delimitates and orders the territory but also influences the way of life of its inhabitants. On the basis of an appreciation of the Plano Diretor dos Balneários, a law that defines the territorial zoning of the beaches of Florianópolis, its objectives, goals and strategies of development, it is possible to identify that several are the discrepancies between the reality and the existing law. The study allows verifying the veracity of some established premises, such as that this Plano Diretor as it is nowadays, does not fulfil its moulding and ordering objectives for the Island of Santa Catarina. It can be said that indeed the plan, together with the omission of government, allowed the expansion of irregular and illegal occupations via its incoherencies in relation to other legislation and its own legal text with its annexes
Opposing Effects of Neuronal Activity on Structural Plasticity
No full textThe connectivity of the brain is continuously adjusted to new environmental influences by several activity-dependent adaptive processes. The most investigated adaptive mechanism is activity-dependent functional or synaptic plasticity regulating the transmission efficacy of existing synapses. Another important but less prominently discussed adaptive process is structural plasticity, which changes the connectivity by the formation and deletion of synapses. In this review, we show, based on experimental evidence, that structural plasticity can be classified similar to synaptic plasticity into two categories: (i) Hebbian structural plasticity, which leads to an increase (decrease) of the number of synapses during phases of high (low) neuronal activity and (ii) homeostatic structural plasticity, which balances these changes by removing and adding synapses. Furthermore, based on experimental and theoretical insights, we argue that each type of structural plasticity fulfills a different function. While Hebbian structural changes enhance memory lifetime, storage capacity, and memory robustness, homeostatic structural plasticity self-organizes the connectivity of the neural network to assure stability. However, the link between functional synaptic and structural plasticity as well as the detailed interactions between Hebbian and homeostatic structural plasticity are more complex. This implies even richer dynamics requiring further experimental and theoretical investigations
Stichomitra asymbatos Foreman 1968
No full text<p> <i>Stichomitra asymbatos</i> Foreman, 1968 (Fig. 4I)</p> <p> <i>Stichomitra asymbatos</i> Foreman, 1968: 73, pl. 8, fig. 10a-c.</p> <p> <i>Stichomitra grandis</i> – Hollis 1997: 78, pl. 19, figs 1-4 and synonymy therein.</p> <p> <i>Stichomitra asymbatos</i> – Aumond <i>et al.</i> 2009: 200, fig.3I, J.</p> <p>FIGURED SPECIMEN. — ULVG-7326.</p> <p>MATERIAL. — Eight specimens (recovered with the hydrogen peroxide method); three specimens (recovered with the acetic acid method).</p> <p> OCCURRENCE. — Upper Maastrichtian of California (Foreman 1968); Late Campanian-Maastrichtian to Early Paleocene of New Zealand (Hollis 1997); Maastrichtian of Caribbean Sea (Aumond <i>et al.</i> 2009).</p>Published as part of <i>Kochhann, Karlos G. D., Baecker-Fauth, Simone & Fauth, Gerson, 2013, Late Maastrichtian Radiolaria from ODP Leg 165 - Site 999 B, Colombian Basin, pp. 5-20 in Geodiversitas 35 (1)</i> on page 12, DOI: 10.5252/g2013n1a1, <a href="http://zenodo.org/record/4538016">http://zenodo.org/record/4538016</a>
AcroM fluorescent in situ hybridization analyses of marker chromosomes
No full textThe presence of a de novo supernumerary marker chromosome (SMC) poses problems in genetic counseling. The consequences of the additional chromosomal material may range from harmless to detrimental. As the composition of a SMC cannot be deciphered by traditional banding analysis, sophisticated methods are needed for their rapid and detailed analyses. A new strategy is presented, which allows the elucidation of the composition of SMCs in one or two hybridizations. One hybridization, termed AcroM-FISH, involves a newly generated probe mix, which consists of painting probes for all acrocentric chromosomes, centromere probes for chromosomes 13/21, 14/22, 15, and a probe specific for rDNA, each labeled with a specific combination of fluorochromes. This probe mix is sufficient to characterize approximately 80% of all SMCs. For the other 20% of SMCs, chromosomes can be analyzed in a second hybridization by multicolor karyotyping, for example, multiplex FISH (M-FISH), to check for the presence of euchromatin of other chromosomes. The potential of AcroM-FISH was tested in various applications
The hadron calorimeter of EAS-TOP: operation, calibration and resolution
No full textWe describe and discuss the operation, calibration and stability of the EAS-TOP calorimeter (Campo Imperatore, National Gran Sasso Laboratories), a large area hadron and muon detector devoted to cosmic-ray physics. It consists of iron slabs (for a total thickness of 818 g cm(-2)) and Iarocci tubes as sensitive layers, operating in the streamer mode and the "quasi proportional" regime. Using a model describing the operation of the "quasi proportional" chambers, we derive a calibration curve in the energy range 50-5000 GeV, whose reliability has been indirectly checked through on-site measurements, by means of an accelerator beam run (up to similar or equal to 600-700 GeV) and by comparing the model predictions on hadron shower transition curves with the data. (C) 1999 Elsevier Science B.V. All rights reserved
Damonella medialtis Filho & Ceolin & Fauth & Lima 2023, sp. nov.
No full text<i>Damonella medialtis</i> sp. nov. <p>Fig. 4.4A–C</p> <p> <b>Etymology:</b> From the Latin “ <i>medius</i> ”, meaning “middle”, and “ <i>altitudo</i> ”, meaning “height”, referring to its greatest height being close to the middle point of the carapace.</p> <p> <b>Material:</b> 56 specimens.</p> <p> <b>Figured specimen:</b> ULVG-14195.</p> <p> <b>Dimensions:</b></p> <p> <b>Diagnosis:</b> A <i>Damonella</i> species with greater height closer to the middle. LV overlaps RV along the entire margin, being especially pronounced posterodorsally, and the RV shows a slight concavity both, in the postero-dorsal and antero-dorsal margins.</p> <p> <b>Description:</b> Medium carapace with a sub-rectangular to sub-ovoid outline in lateral view and an ovoid outline in dorsal view. Anterior and posterior margins rounded and equicurvate. Ventral margin slightly concave, dorsal margin convex. Greatest height at the mid-length or slightly posterior of the mid-length, greatest length at mid-height, greatest width slightly posterior to the mid-length.</p> <p>LV larger than RV, visibly overlapping along the entire carapace margin, being particularly prominent posterodorsally. RV shows slight concavities in the postero-dorsal and antero-dorsal margins. Dorsal margin of LV more uniformly convex than that of RV.</p> <p>Carapace surface smooth. Sexual dimorphism not observed. Internal characteristics not visible, as only tightly closed carapaces were recovered.</p> <p> <b>Remarks:</b> This species resembles <i>Damonella grandiensis</i> Tomé <i>et al</i>., 2014, differing mainly in the slight concavities in the antero and posterodorsal margins of its RV and, in dorsal view, in its more compressed anterior region.</p> <p> <b>Occurrences:</b> PS-06-CE: AM-14 (103.6 m), AM-17 (99.8 m), AM-18 (99.3 m), AM-32 (72.59 m), AM-62 (91.5 m).</p> <p> <b>Stratigraphic and geographic distribution:</b> Lower Aptian, Barbalha and Crato formations, Araripe Basin, Brazil (this study).</p>Published as part of <i>Filho, Marcos Antonio Batista Dos Santos, Ceolin, Daiane, Fauth, Gerson & Lima, Francisco Henrique De Oliveira, 2023, Ostracods from the Barbalha and Crato formations, Aptian of the Araripe Basin, northeast Brazil, pp. 332-350 in Zootaxa 5319 (3)</i> on page 340, DOI: 10.11646/zootaxa.5319.3.2, <a href="http://zenodo.org/record/8202919">http://zenodo.org/record/8202919</a>
Controlling the selectivity of high-surface-area Ru/TiO2 catalysts in CO2 reduction - modifying the reaction properties by Si doping of the support
No full textThe influence of Si doping of high specific-surface-area Ru/TiO2 catalysts with similar structural properties on the CO2 reduction reaction was systematically investigated by kinetic measurements, combined with microscopic and spectroscopic methods for ex situ and in situ /operando catalyst characterization. While for undoped Ru/TiO2 a high-temperature treatment (350 °C) in reaction atmosphere results in a pronounced change of the selectivity from methanation to CO formation via the reverse water-gas shift (RWGS) reaction, CH4 formation is stabilized by Si doping of the catalyst support. For doping levels around 8 wt%, almost 100% CH4 selectivity is maintained. Comprehensive catalyst characterization is employed to identify trends in the physical and chemical properties with increasing Si doping and thus physical reasons responsible for the distinct differences in catalyst performance and stability. This work opens a route for improving the stability and selectivity of Ru/TiO2 catalysts in the CO2 hydrogenation reaction, a highly relevant application
Dataset on the bearing capacity of curved profiles obtained by roll forming process
No full textThe paper shows experimental data concerning the bearing capacity of curved profile sheets achieved by roll forming process.
Two different restraint configurations were considered, respectively named A and B and representing the only bending and the axial-bending conditions. Two different experimental setup, i.e. single span with and without horizontal restraints were adopted. Trapezoidal and sinusoidal steel sheets with variable thickness and curvature radius were tested. Setup configurations, collapse
mechanisms and load-deflection diagrams are presented
Extraordinary Magnetic Field Effect in Bent-Core Liquid Crystals
No full textA bent-core mesogen that forms a cybotactic nematic phase exhibits a giant magnetic field-induced shift of its nematic-isotropic and smectic-C-nematic transition temperatures: Delta T(H) = 4 K for H = 10 kOe. In contrast with molecular nematics, in cybotactic nematics the field couples with the anisotropic susceptibility of clusters containing several hundred partially ordered molecules. X-ray diffraction data corroborate a quantitative estimate of inferred cluster size (similar to 300 molecules). The results represent an unequivocal demonstration of the cluster picture of the nematic phase of this class of nonlinear liquid crystals
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