Leandro Silva - Academia.edu (original) (raw)

Papers by Leandro Silva

BMJ Case Reports, 2021

Rosai–Dorfman disease is a rare benign histiocytic proliferative disease of unknown cause that, i... more Rosai–Dorfman disease is a rare benign histiocytic proliferative disease of unknown cause that, in exceptional cases, presents with lesions confined to the skin. Clinically variable types of lesions such as papules, nodules and plaques have been reported. We present a case of a 27-year-old woman with a 1-year history of erythematous papular and nodular lesions on the malar and right axillary regions, previously misdiagnosed as acne. She reported no fever, malaise or weight loss, while physical examination and laboratory workup were normal. Bacteriological and mycobacteriological cultures were negative. Histopathological findings showed dense infiltration of inflammatory cells involving the entire dermis, consisting of large macrophages with emperipolesis, S100 and CD68 positive, neutrophils, eosinophils, lymphocytes and plasma cells. The patient was treated with oral prednisolone without improvement. Dapsone was subsequently initiated with favourable clinical response. The present a...

This real-life current signal was acquired from a wind generator.The nominal fundamental frequenc... more This real-life current signal was acquired from a wind generator.The nominal fundamental frequency of the system is 60 Hz.The sampling rate is 7.680 kHz, which corresponds to 128 samples per fundamental cycle.The magnitude is given in amperes (A). The length of the signal is approximately one hour (3640 s).

Anais do XXV Simpósio Brasileiro de Telecomunicações, 2007

Resumo-Este artigo tem a finalidade de apresentar e comparar técnicas de redução de ruído na reco... more Resumo-Este artigo tem a finalidade de apresentar e comparar técnicas de redução de ruído na reconstrução de sinais de voz degradados por ruído. As técnicas propostas utilizam-se dos filtros de Kalman de tempo discreto e freqüência discreta, ambos combinados com as técnicas de subtração espectral de potência e/ou wavelets. Os desempenhos dos algoritmos foram avaliados, utilizando-se a relação sinal/ruído segmentada e a distância de Itakura-Saito.

Revista Vórtex, 2021

Observando obras diversas referente ao repertório percussivo (quer seja a solo, de câmara ou até ... more Observando obras diversas referente ao repertório percussivo (quer seja a solo, de câmara ou até mesmo sinfônica) percebemos que, em muitos casos, a impossibilidade de troca de baquetas em certos trechos musicais que envolvem montagens de percussão múltipla compromete a sonoridade de determinados instrumentos. Ao realizarmos um estudo sobre patentes e marcas registradas a respeito de sistemas de baquetas que permitem tocar pequenos instrumentos suspensos sem a necessidade de segurar os instrumentos e suas baquetas específicas, foi possível vislumbrarmos melhorias e ideias inovadoras para esse tipo de performance. Utilizando softwares licenciados para projetos em 3D, desenvolvemos e construímos o Sistema de Baquetas para Pequenos Instrumentos Suspensos - SIBAPIS2020. Tratando-se de um sistema com funcionalidades melhoradas e ampliadas em relação ao já existente no mercado, pretendemos contribuir para o melhoramento da performance percussiva, particularmente no contexto de pequenos in...

Bulletin of the American Physical Society, 2018

O presente estudo verificou a importância de atividades psicomotoras em criancas de 6 a 12 anos. ... more O presente estudo verificou a importância de atividades psicomotoras em criancas de 6 a 12 anos. A Psicomotricidade e a relacao entre o pensamento e a acao, evolvendo a emocao. Esta ciencia que estuda o homem por meio de seu corpo em movimento e em relacao ao seu mundo interno e externo e de suas possibilidades de perceber, atuar e agir com o outro, com objetos e consigo mesmo. Para a realizacao desta pesquisa foi utilizado o teste psicomotor dinâmico, chamado de Bateria Psicomotora (BPM), este teste pode vir nao somente ajudar na identificacao de deficits psicomotores mais tambem servir como base para um profissional de educacao fisica elaborar um planejamento coerente a realidade de seus alunos, podendo assim ter uma melhora no desempenho do aprendizado das criancas. Os testes foram realizados por em vinte e quatro criancas do Servico de Convivencia e Fortalecimento de Vinculo (SCFV) da zona norte de Porto Alegre. Foram feitos dois testes, com tres meses de diferenca. Durante esse...

Revista Portuguesa de Imunoalergologia, 2021

A dermatite de contacto alérgica é uma causa frequente de referenciação à consulta de Dermatologi... more A dermatite de contacto alérgica é uma causa frequente de referenciação à consulta de Dermatologia e/ou de Imunoalergologia. É causada pelo contacto com moléculas de baixo peso molecular que funcionam como haptenos e induzem uma reação de hipersensibilidade tardia do tipo IV em indivíduos suscetíveis. São poucos os dados europeus ou nacionais sobre a prevalência desta patologia. Neste trabalho apresentamos dois casos clínicos de doentes com reação alérgica a um biocida frequentemente utilizado nas tintas aquosas e em alguns cosméticos, com um padrão de sensibilização de partículas aerotransportadas.

Crystal Growth & Design, 2021

The proliferation of the SARS-CoV-2 virus to the whole world caused more than 250,000 deaths worl... more The proliferation of the SARS-CoV-2 virus to the whole world caused more than 250,000 deaths worldwide and over 4 million confirmed cases. The severity of Covid-19, the exponential rate at which the virus proliferates, and the rapid exhaustion of the public health resources are critical factors. The RT-PCR with virus DNA identification is still the benchmark Covid-19 diagnosis method. In this work we propose a new technique for representing DNA sequences: they are divided into smaller sequences with overlap in a pseudo-convolutional approach, and represented by co-occurrence matrices. This technique analyzes the DNA sequences obtained by the RT-PCR method, eliminating sequence alignment. Through the proposed method, it is possible to identify virus sequences from a large database: 347,363 virus DNA sequences from 24 virus families and SARS-CoV-2. Experiments with all 24 virus families and SARS-CoV-2 (multi-class scenario) resulted 0.822222 ± 0.05613 for sensitivity and 0.99974 ± 0.0...

Poster Presentations, 2019

(n=4), Thailand (n=3), Australia (n=1), Russia (n=1), Sweden (n=1) and Malaysia (n=1). Therein, 8... more (n=4), Thailand (n=3), Australia (n=1), Russia (n=1), Sweden (n=1) and Malaysia (n=1). Therein, 84% sequences mixed among CN.01AE.HST/IDU-2, most of which were sampled before 2010 and born in Southeast Asia. 14% sequences clustered with CN.01AE.MSM-4 and-5. A distinct sub-cluster with small divergence that consisted of 15 Japanese variants was formed inside CN.01AE.MSM-4 and the tMRCA of CN.01AE.MSM-4 and the latter sub-cluster were around 1996 and 2006. For other four major lineages, we have not found any significant transmission cluster structure for specific geographical regions. Conclusion This results demonstrated the Chinese CRF01_AE variants have disseminated to other countries but have not scaled, and the immigrant modes of CRF01_AE variants from Asia to global has changed. Our study provided the evidences of regional and global dissemination of Chinese CRF01-AE lineages and highlighted the importance of shaping the newest global landscape of HIV and the necessity to implement the effective measures to reduce global spread of HIV. Disclosure No significant relationships.

Journal of the Portuguese Society of Dermatology and Venereology, 2019

PALAVRAS-CHAVE-Alterações da Pigmentação/induzida quimicamente; Hiperpigmentação/induzida quimica... more PALAVRAS-CHAVE-Alterações da Pigmentação/induzida quimicamente; Hiperpigmentação/induzida quimicamente; Minociclina/efeitos adversos.

Tropical Plant Biology, 2018

Sugarcane borer (Diatraea saccharalis) is a major pest of sugarcane (Saccharum spp. hybrids), acr... more Sugarcane borer (Diatraea saccharalis) is a major pest of sugarcane (Saccharum spp. hybrids), across the Americas. The insect is partially controlled by biological and chemical means, but still causes significant economic losses to sugarcane growers and processors. Proteins derived from Bacillus thuringiensis, Bt proteins, have been used to control sugarcane borer in maize (Zea mays) for the past decade. In sugarcane, the expression of individual Bt proteins has been reported several times. However practical use of Bt proteins requires their use as part of an Integrated Pest Management (IPM) system that includes the delivery of high doses of protein and the use of a refuge to slow the evolution of insect resistance to the protein. Here we demonstrate the feasibility of using Bt proteins to protect sugarcane from sugarcane borer in a commercial setting. We have expressed two Bt proteins with differing modes of action (Cry1Ab and Cry2Ab) in commercial sugarcane varieties, demonstrated efficacy against sugarcane borer in the field and describe a strategy for trait deployment in this tropical crop with complex genetics that limits trait introgression by backcrossing.

Journal of the Brazilian Chemical Society, 2017

Carriers with different functional groups (epoxy, aldehyde, ethyldiazonium, phenyldiazonium and a... more Carriers with different functional groups (epoxy, aldehyde, ethyldiazonium, phenyldiazonium and amino) were tested for immobilization of T. versicolor laccase on GMA-co-EGDMA (glycidyl methacrylate-co-ethyleneglycol dimethacrylate) microspheres. Laccase immobilized on GMA-co-EGDMA containing the phenyldiazonium functional group showed the highest activity (96.3 U g-1). The immobilized laccase was used for removal of bisphenol-A (BPA) from aqueous solution. The temperature effect was significant on activity, but insignificant on BPA removal by the immobilized laccase. In the temperature range 10-60 °C, the removal of BPA by laccase in the immobilized form was about four times higher than that in the free form. Swelling does not affect the activity of immobilized laccase, but after 8 cycles of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) oxidation, non-swollen immobilized laccase was able to retain 71% of the starting activity while the 24 h swollen kept 61%. At neutral pH, adsorption onto the immobilized laccase accounted for 92% of the BPA removed while enzymatic conversion accounted for 8%. However, when increasing the pH to 10, the fraction of BPA removed by adsorption decreased to 67% and by enzymatic conversion increased to 33%.

Blucher Design Proceedings, 2016

The following text reports to the development of a climatic responsive component for facades prog... more The following text reports to the development of a climatic responsive component for facades programmed to respond to the movement of the sun as a way to reduce solar gain and glare into the interior ambient with the aim to reduce building's need for energy. This research is part of a methodology of tests to verify the relevance to develop, in the future, a real scale model into the Brazilian context.

Society of Nuclear Medicine Annual Meeting Abstracts, May 1, 2013

Revista Eletrônica Sapere Aude, 2016