Influence of operating conditions on proton conductivity of nanocellulose films using two agroindustrial wastes: Sugarcane bagasse and pinewood sawdust.

Cellulose nanocrystals (CNCs) were isolated from two-agroindustrial wastes: sugarcane bagasse (SCB) and pinewood sawdust (PWS), to analyze their chemical, structural, morphological, and proton conduction properties in dependence of the synthesis parameters. In both sources, the isolated CNCs correspond to the monoclinic phase of cellulose type I and II. For SCB, the smallest CNCs were isolated, in a range of 3-10 nm, with 5 wt.% of NaOH and 60 °C of acid hydrolysis. PWS displayed the smallest sizes at 75 °C and 10 wt.% NaOH (40-110 nm). Membrane characterization suggests that isolated CNCs, between 75 and 90 °C of acid hydrolysis and 10 wt.% NaOH from both SCB and PWS sources, displayed an important increase in the proton conductivity, 1.23(±0.61)×10-5 and 9.26 (±0.24)×10-5 S-m-1, respectively. Thus, with proper synthesis conditions, CNCs can be potentially used as based element to obtain other proton conductor materials to fabricate PEMs.

Data supporting the elemental composition, the morphological and thermal properties of MnPhos/waterborne poly(urethane)(WPU) coatings for carbon steel.

The data set presented here offers evidence of the elemental composition related to a SEM micrograph of [Mn5(PO3(OH))2(PO4)2⋅4H2O] (MnPhos) powders, known as hurealite, and synthesized by the reflux method. In addition, it contains additional information of the glass transition, melting and decomposition temperatures and their weight loss percent of coatings based on MnPhos incorporated into waterborne poly(urethane) (WPU). These data are complementing of the article "Corrosion investigation of new hybrid organic/inorganic coatings for carbon steel substrates: electrochemical and surface characterizations".

Dataset on electrochemical reduced graphene oxide production: Effect of synthesis parameters.

Structural and microstructural characterization combined with vibrational, rotational modes are quite important to determinate reduction degree during synthesis of reduced graphene oxide. These data and analysis support the research article "Electrochemical alternative to obtain reduced graphene oxide by pulse potential: effect of synthesis parameters and study of corrosion properties" (López-Oyama et al., 2018). The data and analysis presented here included raw data for selected reduction potentials (V SCE) and different temperatures values (°C). Transmission electron microscopy (TEM) images of the exfoliated graphite are shown to corroborate the effect of the applied voltage to obtain electrochemically reduced graphene oxide (ERGO) on commercial 304L stainless steel (304L SS). The data provided in this article has not been previously published and are available to enable critical or extended analyses.

Structure, electronic properties, and aggregation behavior of hydroxylated carbon nanotubes.

We present a combined experimental and theoretical study to analyze the structure, electronic properties, and aggregation behavior of hydroxylated multiwalled carbon nanotubes (OH-MWCNT). Our MWCNTs have average diameters of ~2 nm, lengths of approximately 100-300 nm, and a hydroxyl surface coverage θ~0.1. When deposited on the air/water interface the OH-MWCNTs are partially soluble and the floating units interact and link with each other forming extended foam-like carbon networks. Surface pressure-area isotherms of the nanotube films are performed using the Langmuir balance method at different equilibration times. The films are transferred into a mica substrate and atomic force microscopy images show that the foam like structure is preserved and reveals fine details of their microstructure. Density functional theory calculations performed on model hydroxylated carbon nanotubes show that low energy atomic configurations are found when the OH groups form molecular islands on the nanotube's surface. This patchy behavior for the OH species is expected to produce nanotubes having reduced wettabilities, in line with experimental observations. OH doping yields nanotubes having small HOMO-LUMO energy gaps and generates a nanotube → OH direction for the charge transfer leading to the existence of more hole carriers in the structures. Our synthesized OH-MWCNTs might have promising applications.

Interaction of the cationic peptide bactenecin with phospholipid monolayers at the air-water interface: i interaction with 1,2-dipalmitoyl-sn-glycero-3-phosphatidilcholine.

In this work we have investigated the influence of NaCl on the adsorption of the antimicrobial cationic peptide bactenecin in the monolayer of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) at the air-water interface, as a function of NaCl concentrations in the subphase. We show that the effect of the salt concentration on DPPC monolayers is a monotonic decrease of the liquid-condensed-liquid-expanded (LC-LE) coexistence region. By contrast, the effect of the bactenecin adsorption at the DPPC monolayer not only removed the LC-LE coexistence region plateau, but also shifted the DPPC isotherms to higher pressures and increased the compressibility of the DPPC/bactenecin monolayers with respect to the pure DPPC monolayer around the LC phase. Analysis of the domain structure, obtained by Brewster angle and atomic force microscopes, indicates that the salt concentration in the subphase builds an electrostatic barrier, increasing the rigidity of DPPC monolayers and limiting the bactenecin adsorption at the LC-LE phase coexistence.

Esquistossomose mansônica hepatoesplênica em adolescentes: carga parasitária residual após tratamento clínico-cirúrgico / Hepatosplenic mansonic schistosomiasis in adolescents: Residual parasitary burden after medical and surgical treatment

A esquistossomose na forma hepatoesplênica associada a varizes sangrentas do esôfago, hiperesplenismo e/ou hipoevolutismo, em adolescentes, tem sido tratada clinicamente com oxamniquime e cirurgicamente por esplenectomia, ligadura da veia gástrica esquerda e auto-implante esplênico. Nos casos de recidiva hemorrágica, os pacientes são incluidos no protocolo de escleroterapia endoscópica das varizes esofageanas. No seguimento pós-operatório desses pacientes tem sido observado a manutenção de hiperglobulinemia G e M, e, eosinnofilia, fazendo supor a possibilidade de manutenção de carga parasitária residual ou reinfecção. vinte e quatro pacientes, entre 11 e 20 anos, foram submetidos a biópsia retal e oograma quantitativo, além do Kato-Katz para verificação dessa possibilidade. Em 17 pacientes, o oograma foi negativo, entretanto, em sete, o exame foi positivo, dos quais, quatro apresentavam ovos viáveis. O Kato-Katz, com ovos viáveis foi igualmente, positivo nesses quatros pacientes. Observou-se associação positiva entre os elevados níveis séricos de imunoglobulina G e a positividade do oograma. Os achados indicam uma carga parasitária residual ou reinfecção em cerca de 17 por cento dos pacientes, o que poderia estar interferindo na evolução clínica desses pacientes

Fraturas da clavícula distal: tratamento e resultados / Distal clavicle: treatment and results

Entre abril de 1988 e janeiro de 1996 foram operados, pelo Grupo de Ombro do Departamento de Ortopedia e Traumatologia da Santa Casa de Säo Paulo - "Pavilhäo Fernandinho Simonsen", 26 pacientes com fratura da clavícula distal. Destes, 15 foram acompanahdos por período médio de 12,7 meses, sendo que seis fraturas foram classificadas como tipo II, uma como tipo III e oito como tipo V (classificaçäo de Craig). A técnica cirúrgica utilizada foi a dupla cerclagem coracoclavicular com fio inabsorvível n§ 5, como descrita por Neer, em 11 pacientes, fio de Kirschner cruzados em dois e técnica de Weaver-Dunn em dois. Os resultados obtidos foram avaliados pelo método UCLA, sendo dez pacientes classificados como excelentes e cinco como bons. A restauraçäo do "mecanismo suspensor" do ombro, através da reduçäo e fixaçäo indireta do foco de fratura com dupla cerclagem coracoclavicular, mostrou-se ser método simples, eficaz e com baixo índice de complicaçoes.