Lee Lozano

ABBILDUNGEN: nur in PRINTAUSGABE

From the movements to the movement: The importance of the social, popular and syndical movements in the constitution of the teacher's political identity

Este artigo resulta de pesquisa que investigou a importância dos movimentos social, político e sindical na constituição da identidade política docente. Respaldada na abordagem qualitativa, o trabalho apoiou-se no levantamento bibliográfico e documental, em entrevistas narrativas e observações-participantes. A questão que fomentou o estudo foi: Como a formação, dentro dos movimentos social, popular e sindical, associada à formação sindical, às greves e às paralisações, contribuiu para a constituição da identidade política docente? Constatou-se que a constituição política dos professores entrevistados se iniciou nos movimentos social e popular e amadureceu no movimento sindical. Tal fato, aliado à práxis, possibilitou-lhes a luta e a defesa por uma educação pública com qualidade socialThe article results from a research that investigated the importance of social, political and syndical movements in the constitution of teacher’s political identity. Based on qualitative approach, this paper is supported by a bibliographic research, interviews and participant-observations. The question here is how education background inside social, popular and syndical movements, associated to syndical education, to strikes and to stoppages contributed to the constitution of the teacher’s political identity? It can be concluded that the interviewers’ political background began in the social and popular movement and matured in the syndical movement. That fact associated to praxis resulted in the fight and defense of a public education with social qualit

The importance of Paulo Freire ideas for health education in Brazil

The theoretical production of Paulo Freire value the popular knowledge and the exchange of knowledge in establishing a relationship of trust between health professionals, patients generally to pregnant / lactating women and family for the actions of health promotion. We can observe the presence of Freire\u27s ideas, most important popular educator from Brazil, fairly present in health education, specifically in humanized care, which is extremely important for the activity of nurses and educators. While nurses / educators, we must think about the social context in which the patient lives, their limitations, their abilities, difficulties and facilities. It is very important know the reality of patients and family so we can provide nursing care and health education properly, thus establishing effective education conducts both in their treatment in health facilities as the continuity of their treatment at home

Intrusion and extrusion of liquids in highly confining media: bridging fundamental research to applications

Wetting and drying of pores or cavities, made by walls that attract or repel the liquid, is a ubiquitous process in nature and has many technological applications including, for example, liquid separation, chromatography, energy damping, conversion, and storage. Understanding under which conditions intrusion/extrusion takes place and how to control/tune them by chemical or physical means are currently among the main questions in the field. Historically, the theory to model intrusion/extrusion was based on the mechanics of fluids. However, the discovery of the existence of metastable states, where systems are kinetically trapped in the intruded or extruded configuration, fostered the research based on modern statistical mechanics concepts and more accurate models of the liquid, vapor, and gas phases beyond the simplest sharp interface representation. In parallel, inspired by the growing number of technological applications of intrusion/extrusion, experimental research blossomed considering systems with complex chemistry and pore topology, possessing flexible frameworks, and presenting unusual properties, such as negative volumetric compressibility. In this article, we review recent theoretical and experimental progresses, presenting it in the context of unifying framework. We illustrate also emerging technological applications of intrusion/extrusion and discuss challenges ahead

Application of cupuassu shell as biosorbent for the removal of textile dyes from aqueous solution

AbstractThe cupuassu shell (Theobroma grandiflorum) which is a food residue was used in its natural form as biosorbent for the removal of C.I. Reactive Red 194 and C.I. Direct Blue 53 dyes from aqueous solutions. This biosorbent was characterized by infrared spectroscopy, scanning electron microscopy, and nitrogen adsorption/desorption curves. The effects of pH, biosorbent dosage and shaking time on biosorption capacities were studied. In acidic pH region (pH 2.0) the biosorption of the dyes were favorable. The contact time required to obtain the equilibrium was 8 and 18 h at 298 K, for Reactive Red 194 and Direct Blue 53, respectively. The Avrami fractionary-order kinetic model provided the best fit to experimental data compared with pseudo-first-order, pseudo-second-order and chemisorption kinetic adsorption models. The equilibrium data were fitted to Langmuir, Freundlich, Sips and Radke–Prausnitz isotherm models. For both dyes the equilibrium data were best fitted to the Sips isotherm model

Forage potential of native ecotypes of Paspalum notatum and P. guenoarum

The Paspalum genus includes several species that are important for livestock in Rio Grande do Sul, such as P. notatum and P. guenoarum, typical of native pastures of the Pampa biome. The aim of this study was to investigate forage production and chemical composition of four ecotypes of these species in relation to the cv. ‘Pensacola’ (P. notatum). Ecotypes of P. guenoarum (Azulão and Baio) and P. notatum (André da Rocha and Bagual) and the cv. ‘Pensacola’ were evaluated for two years, during which four cuts/year were made. The work was carried out under field conditions at the Agronomic Experimental Station of the Federal University of Rio Grande do Sul (30°05’S; 51°39’W), in a completely randomized design. P. guenoarum stood out for higher productivity and greater tolerance to cold; the Azulão ecotype showed more autumn production in relation to the other ecotypes. Crude protein content ranged from 14 (Baio) to 15% (‘Pensacola’); for neutral detergent fiber, the variation was 68 (Azulão) to 71% (‘Pensacola’) and for acid detergent fiber there was a variation of 38 (‘Pensacola’) to 43% (Baio). The data demonstrates the potential of native genotypes for use as cattle feeding in southern Brazil

Optimization of the wetting-drying characteristics of hydrophobic metal organic frameworks via crystallite size: The role of hydrogen bonding between intruded and bulk liquid

Hypothesis: The behavior of Heterogeneous Lyophobic Systems (HLSs) comprised of a lyophobic porous material and a corresponding non-wetting liquid is affected by a variety of different structural parameters of the porous material. Dependence on exogenic properties such as crystallite size is desirable for system tuning as they are much more facilely modified. We explore the dependence of intrusion pressure and intruded volume on crystallite size, testing the hypothesis that the connection between internal cavities and bulk water facilitates intrusion via hydrogen bonding, a phenomenon that is magnified in smaller crystallites with a larger surface/volume ratio. Experiments: Water intrusion/extrusion pressures and intrusion volume were experimentally measured for ZIF-8 samples of various crystallite sizes and compared to previously reported values. Alongside the practical research, molecular dynamics simulations and stochastic modeling were performed to illustrate the effect of crystallite size on the properties of the HLSs and uncover the important role of hydrogen bonding within this phenomenon. Findings: A reduction in crystallite size led to a significant decrease of intrusion and extrusion pressures below 100 nm. Simulations indicate that this behavior is due to a greater number of cages being in proximity to bulk water for smaller crystallites, allowing cross-cage hydrogen bonds to stabilize the intruded state and lower the threshold pressure of intrusion and extrusion. This is accompanied by a reduction in the overall intruded volume. Simulations demonstrate that this phenomenon is linked to ZIF-8 surface half-cages exposed to water being occupied by water due to non-trivial termination of the crystallites, even at atmospheric pressure

Mechanism of Water Intrusion into Flexible ZIF-8: Liquid Is Not Vapor

Zeolitic Imidazolate Frameworks (ZIF) find application in storage and dissipation of mechanical energy. Their distinctive properties linked to their (sub)nanometer size and hydrophobicity allow for water intrusion only under high hydrostatic pressure. Here we focus on the popular ZIF-8 material investigating the intrusion mechanism in its nanoscale cages, which is the key to its rational exploitation in target applications. In this work, we used a joint experimental/theoretical approach combining in operando synchrotron experiments during high- pressure intrusion experiments, molecular dynamics simulations, and stochastic models to reveal that water intrusion into ZIF-8 occurs by a cascade filling of connected cages rather than a condensation process as previously assumed. The reported results allowed us to establish structure/function relations in this prototypical microporous material, representing an important step to devise design rules to synthesize porous media

Tratamento térmico e químico para controle da atividade da poligalacturonase no albedo do maracujá

The objective of this work was to evaluate the use of thermal and chemical treatments with Ca2+, in order to control the activity of polygalacturonase and its effects on extraction yield and degree of pectin esterification from albedo of yellow passion fruit (Passiflora edulis) rind. Rinds of fruit with light‑green peel were washed, sanitized, grind, and left to stand in water for albedo suspension. Albedo was collected and subjected to a temperature of 90oC for 30, 60, and 120 min, or to calcium levels of 0.01 and 1% during 1 hour of stirring, at 400 rpm, at ambient temperature. Thermal treatment of the crude enzymatic extract obtained from the albedo at 65, 75, and 85oC was also performed. The thermal treatment of the albedo at 90oC did not inactivate polygalacturonase after 120 min. The inactivation of the enzyme extracted from the albedo occurred after incubation at 65, 75, and 85oC for 30, 20, and 10 min, respectively. The treatment with calcium ion solution at 1% promoted enzymatic inactivation and a decrease in the content of free carboxylic acids (FCA) of pectin. The treatment of passion fruit albedo with calcium Ca2+ solution at 1% for 1 hour inhibits the polygalacturonase activity and decreases the content of FCA.O objetivo deste trabalho foi avaliar tratamentos térmicos e químicos com Ca2+, no controle da atividade da poligalacturonase e de seus efeitos no rendimento de extração e no grau de esterificação da pectina do albedo da casca de maracujá‑amarelo (Passiflora edulis). Utilizaram-se cascas de frutos com coloração verde‑clara, as quais foram lavadas, sanitizadas, trituradas e deixadas em repouso em água, para suspensão do albedo. O albedo foi recolhido e submetido à temperatura de 90oC a 30, 60 e 120 min, ou a concentrações de cálcio de 0,01 e 1% durante 1 hora de agitação de 400 rpm, em temperatura ambiente. Realizou-se, também, o tratamento térmico do extrato enzimático bruto obtido do albedo a 65, 75 e 85°C. O tratamento térmico do albedo a 90°C não inativou a poligalacturonase após 120 min. A inativação da enzima extraída do albedo ocorreu após incubação a 65, 75 e 85°C por 30, 20 e 10 min, respectivamente. O tratamento com íons de cálcio a 1% promoveu o bloqueio enzimático e a redução no conteúdo de ácidos urônicos livres (AUL) da pectina. O tratamento do albedo de maracujá com solução de 1% de Ca2+ por 1 hora inibe a atividade da poligalacturonase e reduz o conteúdo de AUL

Early transplantation of human immature dental pulp stem cells from baby teeth to golden retriever muscular dystrophy (GRMD) dogs: Local or systemic?

<p>Abstract</p> <p>Background</p> <p>The golden retriever muscular dystrophy (GRMD) dogs represent the best available animal model for therapeutic trials aiming at the future treatment of human Duchenne muscular dystrophy (DMD). We have obtained a rare litter of six GRMD dogs (3 males and 3 females) born from an affected male and a carrier female which were submitted to a therapeutic trial with adult human stem cells to investigate their capacity to engraft into dogs muscles by local as compared to systemic injection without any immunosuppression.</p> <p>Methods</p> <p>Human Immature Dental Pulp Stem Cells (hIDPSC) were transplanted into 4 littermate dogs aged 28 to 40 days by either arterial or muscular injections. Two non-injected dogs were kept as controls. Clinical translation effects were analyzed since immune reactions by blood exams and physical scores capacity of each dog. Samples from biopsies were checked by immunohistochemistry (dystrophin markers) and FISH for human probes.</p> <p>Results and Discussion</p> <p>We analyzed the cells' ability in respect to migrate, engraftment, and myogenic potential, and the expression of human dystrophin in affected muscles. Additionally, the efficiency of single and consecutive early transplantation was compared. Chimeric muscle fibers were detected by immunofluorescence and fluorescent <it>in situ </it>hybridisation (FISH) using human antibodies and X and Y DNA probes. No signs of immune rejection were observed and these results suggested that hIDPSC cell transplantation may be done without immunosuppression. We showed that hIDPSC presented significant engraftment in GRMD dog muscles, although human dystrophin expression was modest and limited to several muscle fibers. Better clinical condition was also observed in the dog, which received monthly arterial injections and is still clinically stable at 25 months of age.</p> <p>Conclusion</p> <p>Our data suggested that systemic multiple deliveries seemed more effective than local injections. These findings open important avenues for further researches.</p