Research on eco-friendly methods led to the investigation of natural inhibitors and silane films modified with nanostructured mesoporous silica (SBA-15), a molecular sieve that can carry molecules with inhibitory properties. Combining natural extracts such as cocoa husk with SBA-15 aims to develop an enhanced silane-based pretreatment. This involves obtaining an alcoholic extract, and then mixing it with SBA-15 to modify the silane film. Different concentrations (1%, 2%, and 3%) of SBA-15 loaded with extract were prepared. Electrochemical tests, especially electrochemical impedance spectroscopy (EIS), in a 0.1 mol/L NaCl solution, revealed improved corrosion resistance with the tetraethylorthosilane (TEOS) film modified using 3% SBA-15 loaded with extract. Scanning electron microscopy showed the film and SBA-15 on the steel surface, while Fourier transform infrared spectroscopy identified functional groups characteristic of SBA-15, pure or loaded, and silane film. Therefore, it was possible to enhance the TEOS silane film by adding SBA-15 loaded with plant residue extract. ecofriendly eco friendly SBA15, SBA15 SBA 15 , (SBA-15) properties SBA-1 silanebased based pretreatment 1%, 1 (1% 2 2% 3 prepared tests EIS, EIS (EIS) 01 0 0. molL mol L solution (TEOS surface 15, Therefore SBA1 (SBA-15 SBA- 1% (1 (EIS (SBA-1 ( (SBA- (SBA

RESUMO O caso de ensino descreve a trajetória do empreendedor Raphael Vidal. As informações apresentadas possibilitam vincular a história e as crenças do sujeito-empreendedor Raphael às decisões referentes ao empreendimento Casa Porto no contexto da pandemia do COVID-19. Aspectos de sua postura empreendedora como base para a forma como vem conduzindo a Casa Porto são evidenciadas, assim como são resgatados elementos relacionados à decisão de abrir, conduzir e manter um negócio diante de situações de crise. Adicionalmente, são abordadas nuances relativas a outras esferas envolvidas no entendimento do empreendedor como um ser social.

ABSTRACT This teaching case describes the trajectory of the entrepreneur Raphael Vidal. The information presented makes it possible to link the history and beliefs of the subject-entrepreneur Raphael to the decisions regarding Casa Porto project in the context of the COVID-19 pandemic. Aspects of his entrepreneurial attitude as a basis for the way he has been conducting Casa Porto are exposed. In addition, elements related to the decision to open, conduct, and maintain a business in situations of crisis are displayed. And more importantly, nuances related to other spheres involved in the understanding of the entrepreneur as a social being are addressed.

A novel sensing phase of polyurethane was predicted by quantum chemical calculations as capable of detecting toluene, with the experimental results revealing a limit of detection of 1.4 mg L-1 in the determination of toluene in water samples. The quantum chemical computational strategy was validated by assessing the impact of the polymer matrix sensing phases polyvinyl chloride (PVC), polydimethylsiloxane (PDMS), and polyisobutylene (PIB), as solvents, on the Gibbs energy of solvation of the organic contaminants toluene, benzene, chlorobenzene and ethylbenzene. Computational results for the set studied indicate that the limit of detection of contaminants for each polymeric matrix correlated well with the Gibbs energy of solvation. As such, the computational methodology was employed to assess the potential applicability of polyurethane matrices on the determination of toluene as a contaminant in water, with positive results. Analyzes were then carried out experimentally by mid-infrared spectroscopy. Finally, experiments revealed good regenerative capacity of polyurethane, further adding to the usefulness of the technique here advanced.

Mielopatia por HTLV-I (HAM) tem sido descrita como doença sistêmica caracterizada pelo acometimento de vários órgãos além do sistema nervoso. Neste registro, estamos relatando o envolvimento pulmonar em pacientes com HAM.

HTLV-I associated myelopathy has been described as a systemic disease characterized by manifestations in several organs outside the nervous system. We report inflammatory pulmonary involvement in patients with diagnosis of HAM.