Ponkan: publicação independente, memórias e processos manuais

Publicação independente biográfica, desenvolvida através de processos manuais distintos, a fim de investigar e compreender as relações e limi- tações dessas técnicas. O projeto busca analisar o cenário da produção artesanal brasileira, potencializando sua relação com o design. Busca-se também, compreender o processo editorial da publicação independente quando relacionado ao artesanal. A narrativa desenvolvida para realização desse projeto, reúne memórias através de cartas, fotos e relatos pessoais

Proliferação Melanocítica Uveal Difusa Bilateral (BDUMP) como forma de apresentação de adenocarcinoma do pulmão

Objectivo: Descrever um caso da rara síndroma de proliferação melanocítica uveal difusa bilateral(BDUMP). Descrição do Caso Clínico: Doente, do sexo masculino, 64 anos, fumador, com história de Perda progressiva e grave da acuidade visual bilateral nos últimos 9 meses. A observação apresentava melhor acuidade visual corrigida (MAVC) de 20/50 no OD e de 20/70 no OE, catarata bilateral e tumor pigmentado da íris no OE. Para além destas alterações apresentava ainda bilateralmente vários tumores coroideus pigmentados e múltiplas pequenas lesões vermelho-acastanhadas ao nível do epitélio pigmentado da retina, com correspondente hiperfluorescência precoce na angiografia fluoresceínica e perda de autofluorescência. Com base nos dados clínicos foi feito o diagnóstico de BDUMP e iniciada uma avaliação sistémica que conduziu ao diagnóstico de adenocarcinoma do pulmão, detectado por TC e confirmado por biópsia. Conclusões: BDUMP é uma síndroma paraneoplásica rara que ocorre em doentes com carcinoma sistémico, muitas vezes oculto. A consideração desta entidade clínica pode conduzir a um diagnóstico mais precoce de uma neoplasia potencialmente com melhoria do prognóstico associado

Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator MnBi2_2Te4_4

Modification of the gap at the Dirac point (DP) in antiferromagnetic (AFM) axion topological insulator MnBi$_2$Te$_4$ and its electronic and spin structure has been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) under laser excitation with variation of temperature (9-35~K), light polarization and photon energy. We have distinguished both a large (62-67~meV) and a reduced (15-18~meV) gap at the DP in the ARPES dispersions, which remains open above the N\'eel temperature ($T_\mathrm{N}=24.5$~K). We propose that the gap above $T_\mathrm{N}$ remains open due to short-range magnetic field generated by chiral spin fluctuations. Spin-resolved ARPES, XMCD and circular dichroism ARPES measurements show a surface ferromagnetic ordering for large-gap sample and significantly reduced effective magnetic moment for the reduced-gap sample. These effects can be associated with a shift of the topological DC state towards the second Mn layer due to structural defects and mechanical disturbance, where it is influenced by a compensated effect of opposite magnetic moments

Characterization of a gene coding for the complement system component FB from loxosceles laeta spider venom glands

The human complement system is composed of more than 30 proteins and many of these have conserved domains that allow tracing the phylogenetic evolution. The complement system seems to be initiated with the appearance of C3 and factor B (FB), the only components found in some protostomes and cnidarians, suggesting that the alternative pathway is the most ancient. Here, we present the characterization of an arachnid homologue of the human complement component FB from the spider Loxosceles laeta. This homologue, named Lox-FB, was identified from a total RNA L. laeta spider venom gland library and was amplified using RACE-PCR techniques and specific primers. Analysis of the deduced amino acid sequence and the domain structure showed significant similarity to the vertebrate and invertebrate FB/C2 family proteins. Lox-FB has a classical domain organization composed of a control complement protein domain (CCP), a von Willebrand Factor domain (vWFA), and a serine protease domain (SP). The amino acids involved in Mg2+ metal ion dependent adhesion site (MIDAS) found in the vWFA domain in the vertebrate C2/FB proteins are well conserved; however, the classic catalytic triad present in the serine protease domain is not conserved in Lox-FB. Similarity and phylogenetic analyses indicated that Lox-FB shares a major identity (43%) and has a close evolutionary relationship with the third isoform of FB-like protein (FB-3) from the jumping spider Hasarius adansoni belonging to the Family Salcitidae

Characterization and phylogenetic analysis of genes coding for the components C3 and factor B of Complement System from Loxosceles spiders venom glands.

O sistema complemento parece ter surgido com o aparecimento de C3 e fator B (FB), os únicos componentes encontrados nos organismos mais primitivos, o que sugere que a via alternativa seja a mais antiga. Fragmentos de cDNA codificantes para FB (Lox-FB) e C3 (Lox-C3) foram sintetizados a partir do RNA total isolado da glândula de veneno de Loxosceles laeta e amplificados por técnicas de RACE-PCR. Lox-FB apresenta uma organização de domínios clássica, composta por domínios CCP, vWFA e de serino protease. Os aminoácidos envolvidos na ligação ao C3b são conservados, no entanto, a tríade catalítica clássica não foi encontrada. Lox-C3 apresenta uma configuração de domínios similar a do C3 humano, contendo dois sítios putativos de processamento: um entre as cadeias α e γ, e outro entre as cadeias α e β, indicando que Lox-C3 seja composto por três cadeias. As análises filogenéticas indicaram que Lox-C3 e Lox-FB são mais próximos evolutivamente aos componentes equivalentes da aranha Hasarius adansoni, com valores de identidade de 53% e 43%, respectivamente.The complement system seems to have arisen with the appearance of C3 and factor B (FB), the only components found in the most primitive organisms, suggesting that the alternative pathway is the oldest. cDNA fragments coding for the complement factor B (Lox-FB) and C3 (Lox-C3) were synthesized from total RNA Loxosceles laeta venom gland and amplified using RACE-PCR techniques. Lox-FB has a classical domain organization in mosaic, composed by CCPs, vWFA and serine protease domains. The amino acids involved in binding to C3b are conserved, however, the classical calatytic triad was not found. Lox-C3 presents a similar configuration of domains to C3 human and has two putative processing sites: the first one is located between α and γ chains and other between α and β chains, indicating that Lox-C3 is composed by three chains. The phylogenetic analyses indicated that Lox-C3 and Lox-FB are evolutionary closer to the equivalent components of Hasarius adansoni, with identity values of 53% and 43%, respectively

Continuous microfluidic solvent extraction of cobalt from mimicked and real asteroid leaching solutions

This research proposes a pathway for the last step of the asteroid mining process: the purification of the adjacent metals, cobalt and nickel, in the frame of in-situ resource utilization (ISRU) in space. Major technological and economic challenges will need to be overcome, and one main issue to be tackled is the reduction of water usage in this process. Therefore, the leached metal solutions are expected to contain ultra-high metal concentrations, up to 10 mol/l. These solutions will have challenging thermodynamic properties (increased density, viscosity and interfacial tension). As a result, an analysis of dimensionless numbers for fluidics and mass transport was made, showing that some of these are favourable under the constraints of accessible microfluidic operations. Experiments were performed with advanced microfluidic reactors (a coiled-flow inverter (CFI) and an industrial re-entrance flow reactor from Corning®) at high metal concentrations and high nickel to cobalt ratios (3:0.3 mol/l Ni:Co). Using Cyanex 272 as a selective extractant for cobalt, extraction efficiencies of 60% with high separation factors (>1000) were reached in just one extraction stage. The CFI showed high extraction efficiency for low fluid velocities and a residence time of 60 s. For the Corning® reactor, high fluid velocities or the use of many modules (>3) are needed to obtain an emulsion, resulting in high extraction efficiencies at a very short residence time of 13 s. The comparison between the CFI and the Corning® reactor shows that they share the best operation point (at 120 ml/h), but the Corning® reactor performs better at higher flow rates and thus can leverage higher productivity. However, the CFI is easier to operate and has a much lower pressure drop, resulting in low energy input. Finally, an iron meteorite sample was leached and efficiently extracted in both microfluidic reactors