Bacterial cellulose hydrogel and calcium alginate in the cicatricial wound process from diabetic foot implementation

Objectives: Due to the excellent properties of alginate-containing bacterial cellulose hydrogel, the objective was to treat a wound that is difficult to heal in a diabetic patient. Method: The treatment was carried out at the Santa Casa de Misericordia de São Carlos Ambulatory for 30 days, with the application of bacterial cellulose hydrogel containing alginate twice a week Results: After 30 days of treatment, the wound showed an 84% reduction in its initial size Conclusion: Bacterial cellulose hydrogel containing alginate has high potential for the treatment of wounds

Cellulose fiber network as reinforcement of thermoplastic paraffin films

Abstract The incorporation of natural fibers into polymer matrices poses challenges due to physicochemical incompatibility, which is typically addressed through precursor modification or the use of compatibilizers. Here, we introduce a novel type of composite that overcomes this challenge by utilizing a network of fine, porous cellulosic sheets inter-diffused with a commercial paraffin films. This approach physically adheres the fiber network to the matrix, preserving its structure. Microscopy images confirm the formation of the proposed microstructure, and mechanical testing reveals a gradual increase in modulus and strength with the incorporation of cellulose. The maximum incorporation achieved was 7.6% (w/w) of cellulosic fibers, resulting in a 167% increase (1.67 times improved) in composite stiffness. Moreover, these composites exhibit ductility, with an average deformation of 410 ± 38%, corresponding to 20% reduction in relation to pure matrix. Our findings demonstrate the potential of this approach for developing sustainable materials with improved mechanical properties

Influence of pre-milling of Cr3C2-25 NiCr spray powder on the fatigue life of HVOF-sprayed coating on ASTM A516 steel substrate

The aim of the present investigation is to evaluate the influence of the powder size of Cr3C2-25NiCr spraying powder on the fatigue behavior of HVOF-sprayed coating on the ASTM A516 steel substrate. Conventional commercial Cr3C2-25NiCr spraying powder was previously treated through high-energy milling. The crystallite sizes of milled powders were measured by X-ray diffraction and transmission electronic microscopy. Three different powder formats of the same Cr3C2-25NiCr composite were subjected to HVOF spraying to produce (i) a Milled-Coating (from high-energy milled spray powder), (ii) an Original-Coating (from conventional commercial spray powder), and (iii) a 50%–50% mixture of both (Milled + Original-Coating). The same spraying conditions were adopted for all the assessed cases. The sprayed coatings were investigated through the Knoop hardness test and SEM-EDS analysis. In addition, 3-point bending fatigue tests were conducted at different stress levels up to 107 cycles. The coating morphology and roughness effects on fatigue behavior were analyzed. The Cr3C2-25NiCr milled coating presented a lower fatigue life above the fatigue limit and a higher fatigue limit than other coatings; this outcome could be attributed to its lower surface roughness and finer grain size microstructure

Simple implementation of complex functionals: scaled selfconsistency

We explore and compare three approximate schemes allowing simple implementation of complex density functionals by making use of selfconsistent implementation of simpler functionals: (i) post-LDA evaluation of complex functionals at the LDA densities (or those of other simple functionals); (ii) application of a global scaling factor to the potential of the simple functional; and (iii) application of a local scaling factor to that potential. Option (i) is a common choice in density-functional calculations. Option (ii) was recently proposed by Cafiero and Gonzalez. We here put their proposal on a more rigorous basis, by deriving it, and explaining why it works, directly from the theorems of density-functional theory. Option (iii) is proposed here for the first time. We provide detailed comparisons of the three approaches among each other and with fully selfconsistent implementations for Hartree, local-density, generalized-gradient, self-interaction corrected, and meta-generalized-gradient approximations, for atoms, ions, quantum wells and model Hamiltonians. Scaled approaches turn out to be, on average, better than post-approaches, and unlike these also provide corrections to eigenvalues and orbitals. Scaled selfconsistency thus opens the possibility of efficient and reliable implementation of density functionals of hitherto unprecedented complexity.Comment: 12 pages, 1 figur

Mortalidade por doença renal crônica secundária à hipertensão no Brasil: um estudo do “Global Burden of Disease”

Background and Objectives: Chronic kidney disease (CKD) is one of the main complications resulting from arterial hypertension, and a recent increase in the incidence and prevalence of the disease has been reported, which can lead to an increase in mortality and complications resulting from the disease. Thus, the objective of study is to describe the variations in mortality from CKD secondary to arterial hypertension, in Brazil, between the years 1990 to 2019. Methods: Epidemiological study, with a quantitative approach and descriptive character, which analyzed data from the “Global Burden of Disease Study” (GBD) tool. Results: In all of Brazil’s federative units, the estimate of deaths from CKD secondary to hypertension increased, with the Southeast region having the highest estimates. The States of Rio de Janeiro, Rio Grande do Sul, and Paraíba lead with the highest mortality rates. Regarding sex, in all years, higher rates were observed in males, however, over the years, this difference has been reduced. The age group of ≥70 years was the most affected, standing out with the highest death rates. Conclusion: the burden of CKD in Brazil has increased in the last 30 years; among the regions of the country, the Southeast recorded the highest estimates of deaths in all the years analyzed, being mainly higher among men.Justificación y objetivos: La enfermedad renal crónica (ERC) es una de las principales complicaciones derivadas de la hipertensión arterial, y en los últimos años se ha reportado un aumento en la incidencia y prevalencia de la enfermedad, lo que puede conducir a un aumento de la mortalidad y de las complicaciones derivadas de esta, por lo tanto, el objetivo del estudio es describir las variaciones en la mortalidad por ERC secundaria a la hipertensión arterial en Brasil entre los años 1990 a 2019. Métodos: Estudio epidemiológico, con enfoque cuantitativo y carácter descriptivo, que analizó datos de la herramienta Global Burden of Disease Study (GBD). Resultados: En todas las unidades de la federación, aumentó la estimación de muertes por ERC secundaria a la hipertensión arterial, con la región Sudeste presentando las estimaciones más altas. Los estados de Rio de Janeiro, Rio Grande do Sul y Paraíba lideran con las tasas de mortalidad más altas. Con respecto al sexo, en todos los años se observaron mayores tasas en los varones, sin embargo, con el paso de los años, esta diferencia se ha ido reduciendo. El grupo de edad de ≥70 años fue el más afectado, destacándose con las tasas de mortalidad más altas. Conclusión: la carga de ERC en Brasil ha aumentado en los últimos 30 años; de las regiones del país, el Sudeste registró las mayores estimaciones de muertes en todos los años registrados entre los analizados, siendo principalmente mayor entre los hombres.Justificativa e objetivos: A doença renal crônica (DRC) é uma das principais complicações decorrentes da hipertensão arterial. Nos últimos anos, tem sido relatado um aumento na incidência e prevalência da doença, o que pode levar ao aumento da mortalidade e das complicações decorrentes da doença. Assim, o objetivo deste estudo foi descrever as variações da mortalidade por DRC secundária à hipertensão arterial no Brasil entre 1990 e 2019. Métodos: Trata-se de um estudo epidemiológico, de abordagem quantitativa e caráter descritivo, que analisou dados da ferramenta Global Burden of Disease Study (GBD). Resultados: Em todas as unidades da federação, a estimativa de mortes por DRC secundária à hipertensão apresentou aumento, a região Sudeste apresentando as maiores estimativas. Os estados do Rio de Janeiro, Rio Grande do Sul e Paraíba lideram as pesquisas com as maiores taxas de mortalidade. No que diz respeito ao sexo, em todos os anos foram observadas maiores taxas de DRC em indivíduos do sexo masculino; contudo, nota-se que tem ocorrido uma redução dessa diferença. A faixa etária de ≥70 anos foi a mais acometida, destacando-se com as maiores taxas de mortes. Conclusão: a carga de DRC no Brasil aumentou nos últimos 30 anos. Entre as regiões do país, o Sudeste registrou as maiores estimativas de mortes em todos os anos analisados, principalmente de homens

A PERCEPÇÃO DE LICENCIANDOS EM EDUCAÇÃO FÍSICA SOBRE LIVROS DE APOIO DIDÁTICO SOBRE ENSINO DO ESPORTE

This exploratory research aimed to identify, in the perception of Physical Education graduates, which books of sports teaching methodologies can be used as didactic support material for the elaboration of the planning and conduction of Physical Education classes, in the second segment of elementary school and high school. Thirty students, aged 21 to 43 years, participated in the research. Participants remotely answered a semi-structured questionnaire. The collected data were analyzed through descriptive analysis and subsequent triangulation of the data. The results indicated that the renewing thought of Physical Education was assimilated by more than half of the respondents. However, the dissociation between theory and practice still seems to be present in the initial formation in Physical Education.Esta investigación exploratoria tuvo como objetivo identificar, en la percepción de los egresados de Educación Física, qué libros de metodologías de enseñanza deportiva pueden ser utilizados como material de apoyo didáctico para la elaboración de la planificación y conducción de Educación Física clases, en el segundo segmento de primaria y bachillerato. Treinta estudiantes, de 21 a 43 años, participaron en la investigación. Los participantes respondieron un cuestionario semiestructurado de forma remota. Los datos recolectados fueron analizados mediante análisis descriptivo y posterior triangulación de datos. Los resultados indicaron que el pensamiento innovador de la Educación Física fue asimilado por más de la mitad de los encuestados. Sin embargo, la disociación entre teoría y práctica todavía parece estar presente en la formación inicial de Educación Física.A presente pesquisa exploratória teve como objetivo identificar, na percepção de licenciandos em Educação Física, quais os livros de metodologias de ensino do esporte que podem ser utilizados como material de apoio didático para elaboração do planejamento e condução das aulas de Educação Física, no segundo segmento do ensino fundamental e no ensino médio. Participaram da pesquisa 30 estudantes, na faixa etária de 21 a 43 anos. Os participantes responderam de forma remota um questionário semiestruturado. Os dados coletados foram analisados por meio da análise descritiva e posterior triangulação dos dados. Os resultados indicaram que o pensamento renovador da Educação Física foi assimilado por mais da metade dos respondentes. No entanto, a dissociação entre a teoria e a prática ainda parece estar presente na formação inicial em Educação Física