4,400 research outputs found
Neonatal Appendicitis – an Uncommon Diagnosis, not to be Forgotten
Acute appendicitis is a common disease in older children, but extremely rare in the
neonate. Nevertheless, the true incidence might be underestimated, given the difficulty
of the diagnosis. Subtle clinical signs and symptoms usually result in high morbidity
and mortality due to delayed diagnosis and surgical intervention. The presentation
of neonatal appendicitis can be identical to necrotizing enterocolitis, leading to
misdiagnosis. Appendicitis should therefore be considered in the differential diagnosis
for necrotizing enterocolitis and needs strong clinical suspicion.
We report a case of a premature newborn who presented with vomiting, abdominal
distension and free intra-peritoneal air on plain x-ray. He was initially diagnosed
and treated as necrotizing enterocolitis, but the absence of clinical improvement with
standard treatment led to exploratory laparotomy. Surgical exploration revealed an
acutely inflamed appendix with normal small and large intestines and appendectomy
was performed. The post-operatory period was uneventful and the infant was
discharged home. Follow-up confirmed a normal growth and neurodevelopment.
We herein report this case in order to raise awareness to this unusual pathology, so
that an early diagnosis and treatment can lead to a better outcome, improving survival
rate and reducing long term morbidity. We believe uncommon pathologies, like
neonatal appendicitis, should be reported to facilitate proper epidemiologic studies
Model for erosion-deposition patterns
We investigate through computational simulations with a pore network model
the formation of patterns caused by erosion-deposition mechanisms. In this
model, the geometry of the pore space changes dynamically as a consequence of
the coupling between the fluid flow and the movement of particles due to local
drag forces. Our results for this irreversible process show that the model is
capable to reproduce typical natural patterns caused by well known erosion
processes. Moreover, we observe that, within a certain range of porosity
values, the grains form clusters that are tilted with respect to the horizontal
with a characteristic angle. We compare our results to recent experiments for
granular material in flowing water and show that they present a satisfactory
agreement.Comment: 8 pages, 12 figures, submitted to Phys. Rev.
The Future of Women, Peace and Security at NATO
In a ground-breaking move, Women, Peace, and Security (WPS) features prominently in NATO’s Strategic Concept for the first time, a powerful signal that it will form a central part of NATO’s changing priorities going forward. At the same time, there have been significant gendered silences in NATO and its allies’ response to the Russia-Ukraine War, undermining these policy aspirations. This is despite over a decade of significant investment in the WPS architecture across NATO’s political and military structures, including the creation of a high-level Special Representative on Women, Peace, and Security, reporting directly to the Secretary General and supporting a comprehensive WPS policy adopted in conjunction with NATO partners. Focus therefore needs to be given to what NATO can do to operationalize the WPS aspirations of the new Strategic Concept in practice
Spin-glass phase transition and behavior of nonlinear susceptibility in the Sherrington-Kirkpatrick model with random fields
The behavior of the nonlinear susceptibility and its relation to the
spin-glass transition temperature , in the presence of random fields, are
investigated. To accomplish this task, the Sherrington-Kirkpatrick model is
studied through the replica formalism, within a one-step
replica-symmetry-breaking procedure. In addition, the dependence of the
Almeida-Thouless eigenvalue (replicon) on the random fields
is analyzed. Particularly, in absence of random fields, the temperature
can be traced by a divergence in the spin-glass susceptibility ,
which presents a term inversely proportional to the replicon . As a result of a relation between and , the
latter also presents a divergence at , which comes as a direct consequence
of at . However, our results show that, in the
presence of random fields, presents a rounded maximum at a temperature
, which does not coincide with the spin-glass transition temperature
(i.e., for a given applied random field). Thus, the maximum
value of at reflects the effects of the random fields in the
paramagnetic phase, instead of the non-trivial ergodicity breaking associated
with the spin-glass phase transition. It is also shown that still
maintains a dependence on the replicon , although in a more
complicated way, as compared with the case without random fields. These results
are discussed in view of recent observations in the LiHoYF
compound.Comment: accepted for publication in PR
A PROPORCIONALIDADE NO PROCESSO CIVIL BRASILEIRO À LUZ DA TEORIA DO DIREITO DE ROBERT ALEXY E O DEVER DE FUNDAMENTAÇÃO DAS DECISÕES JUDICIAIS.
Contemporaneamente, a proporcionalidade foi criada e desenvolvida como um instituto indispensável aos sistemas jurídicos baseados na precedência normativa e axiológica de direitos fundamentais ou de princípios que, naturalmente, entram em colisão e precisam ser restringidos para a manutenção desse próprio sistema de direitos essenciais. Infelizmente, essa percepção não foi acompanhada com o indispensável rigor teórico e técnico que deveria acompanhar a empregabilidade do instituto, pois boa parte dos seus aplicadores acha-se dispensada de justificar racionalmente a sua aplicação, sob o entendimento de que a proporcionalidade é um princípio-norma material que por si só justifica a sua aplicação. Esse tipo de percepção do instituto, muito comum em nossa doutrina e especialmente em nossa jurisprudência, tem conduzido a aplicações do instituto em casos que sequer precisam do recurso a processos decisórios complexos para a sua solução e também a aplicações injustificadas da proporcionalidade, que impedem a avaliação e o controle da decisão pelas partes e pelos demais interessados na solução do caso concreto, vez que a mera alegação à proporcionalidade não é suficiente ao poder-dever determinado pela Constituição de que as decisões sejam jusfundamentadas. Como essas situações ocorrem com frequência no processo civil e como este ramo do direito, em conjunto com o direito constitucional, estipula que o juiz está submetido a um formalismo processual do qual não pode se desvincular, procurou-se definir a proporcionalidade em uma teoria produzida sob e para a realidade contemporânea de sistemas jurídicos calcados na prevalência de direitos fundamentais: a teoria do direito de Robert Alexy. Sob esse contexto, definimos a proporcionalidade sob as suas perspectivas normativa e a procedimental, pois ambas as perspectivas são essenciais para demonstrar (i) que o instituto não pode ser considerado como um mero método de interpretação, à medida que sua natureza normativa impõe a sua utilização em e somente em - casos reais de colisões entre direitos fundamentais; (ii) que o instituto deve ser aplicado sob um procedimento racionalmente justificado para permitir que os demais intérpretes interessados na solução do caso concreto possam controlar a aplicabilidade do instituto pelo juiz; (iii) que, contrariamente ao que sustenta boa parte da doutrina brasileira, o instituto não se confunde com a razoabilidade originária do direito norte-americano, à medida que ele possui critérios normativos e metodológicos aptos a diferenciar ambos os institutos, devendo cada deles manter-se adstrito ao seu específico campo de aplicação normativa
Robust zero-energy modes in an electronic higher-order topological insulator: the dimerized Kagome lattice
Quantum simulators are an essential tool for understanding complex quantum
materials. Platforms based on ultracold atoms in optical lattices and photonic
devices led the field so far, but electronic quantum simulators are proving to
be equally relevant. Simulating topological states of matter is one of the holy
grails in the field. Here, we experimentally realize a higher-order electronic
topological insulator (HOTI). Specifically, we create a dimerized Kagome
lattice by manipulating carbon-monoxide (CO) molecules on a Cu(111) surface
using a scanning tunneling microscope (STM). We engineer alternating weak and
strong bonds to show that a topological state emerges at the corner of the
non-trivial configuration, while it is absent in the trivial one. Contrarily to
conventional topological insulators (TIs), the topological state has two
dimensions less than the bulk, denoting a HOTI. The corner mode is protected by
a generalized chiral symmetry, which leads to a particular robustness against
perturbations. Our versatile approach to quantum simulation with artificial
lattices holds promises of revealing unexpected quantum phases of matter
Produção de mudas in vitro e indução floral de abacaxizeiro ornamental.
bitstream/item/107308/1/DOC11002.pd
Reproduction of Patella depressa Pennant, 1777 on the central Portuguese coast
The reproductive cycle and the sex ratio of the limpet Patella depressa Pennant, 1777 were studied on two rocky shores of the central coast of the Portugal, over a period of one year. The gonads were examined and their stage of development was assessed. The gonads of P. depressa were found to develop mainly from September/October to December, and between February and April. The spawning peaks occurred in January and between May and August. From June to August the gonads seem to go into a resting phase. In P. depressa the sex proportions seem to be approximately equal, suggesting the absence of sex reversal in these limpets. High wind speed under optimum conditions of air temperatures appears to induce spawning in this species.Estudiamos el ciclo reproductor y la proporción de sexos de la lapa Patella depressa Pennant, 1777 en dos litorales rocosos de la costa central de Portugal. Examinamos las gónadas y valoramos su fase de desarrollo. Encontramos gónadas de P. depressa desarrollándose principalmente desde septiembre/octubre hasta diciembre y entre febrero y abril. Los picos de puesta aparecieron en enero y entre mayo y agosto. Las gónadas parecen permanecer en una fase de reposo desde junio hasta agosto. En P. depressa la proporción de sexos parece ser aproximadamente uno, lo que sugiere la ausencia de inversión sexual en estas lapas. Bajo condiciones óptimas de temperatura del aire, la alta velocidad del viento parece inducir la puesta en esta especie.Instituto Español de Oceanografí
Variabilidade genética em genótipos de mamoneira (RICINUS COMMUNIS L.) em dois anos de cultivo no recôncavo baiano.
Desenvolvimento e validação de um bioensaio para medição de toxicidade de amostra de torta de mamona.
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