Super-austenitic stainless steels (SASS) are alloys with better performance in industrial applications in comparison with standard degrees of austenitic stainless steels (ASS), mainly because of elevated Ni and Mo contents and residual control of certain elements because the improvement of refine techniques. These facts, promotes an improvement of mechanical properties and minimize detrimental effects of intergranular corrosion. Besides, some industrial applications involve high temperatures services, because these alloys families have an excellent creep and oxidation resistances performances. In this work, the objective is evaluate the microstructural and mechanical properties in high Mo SASS exposed at 600˚C in specimens aged until 2000 hours. Thus, hardness and toughness values and Double Loop Electrochemical Potentiodynamic Reactivation (DL-EPR) measurements were analyzed in several thermal aging in comparison to solution treatment condition. Complementary, analysis by Light Optical (LOM), of specimens tested by DL-EPR, and Scanning Electron Microscopies (SEM) in fractured surface from Charpy specimens were also analysed by SEM by backscattered electron mode (BSE). The results show that the aging provokes intergranular embrittlement by inhomogeneous distribution in grain boundaries of Mo rich phase precipitation.

The increasing awareness of the environment protection has contributed to concerns regarding alternative procedures for recycling of plastic wastes. Since chemical processes are high cost, energy and often environment harmful, thermo-mechanical techniques of recycling rises as a good alternative. This research deals with mechanical characterization of thermo-mechanical recycling of composites based on recycled high density polyethylene (HDPE) from post-consumed motor-oil plastic containers as matrix and natural fibers (sisal) as reinforcement. The composites were made by extrusion and then melt blended in a compression mold. The sisal fibers do not contribute to increase tensile strength. As fiber content increases loss of ductility is observed.

O uso milenar de plantas medicinais mostrou ao longo dos anos, que determinadas plantas apresentam substâncias potencialmente perigosas. Do ponto de vista científico, algumas pesquisas mostraram que muitas dessas plantas possuem substâncias agressivas e por essa razão devem ser utilizadas com cuidado, respeitando seus riscos toxicológicos. Os efeitos mais preocupantes do uso indiscriminado de plantas medicinais são embriotóxico, teratogênico e abortivo, uma vez, que os constituintes da planta podem atravessar a placenta, chegar ao feto e gerar um desses efeitos. Este estudo objetiva fornecer uma listagem das principais plantas medicinais que tenham efeitos embriotóxicos, teratogênicos e abortivos comprovados, conhecendo as partes da planta utilizadas e seus respectivos nomes científicos, com a finalidade de alertar gestantes quanto aos riscos de seu uso. Realizou-se buscas nas bases eletrônicas de dados SciELO, PubMed, MEDLINE, LILACS, CAPES e Google acadêmico. Nos resultados encontrados, plantas como Arnica (Arnica montana), Artemísia (Artemisia vulgaris), Arruda (Ruta chalepensis/ Ruta graveolens), Barbatimão (Stryphnodendron polyphyllum), Boldo (Vernonia condensata) dentre outras, podem vir a gerar um desses efeitos. A partir deste estudo comprova-se que para a maioria das plantas medicinais não há dados a respeito da segurança de seu uso durante a gravidez.

The ancient use of medicinal plants has shown over the years that certain plants have potentially dangerous substances. From a scientific point of view, some studies have shown that many of these plants contain aggressive substances and therefore should be used with caution, respecting their toxicological risks. The most important effects of the indiscriminate use of medicinal plants are embryotoxic, teratogenic and abortifacient since the plant constituents can cross the placenta, reaching the fetus and leading to one of these effects. This study aimed to provide a list of the major medicinal plants that have proven embryotoxic, teratogenic and abortifacient effects, including the used plant parts and their respective scientific names, in order to warn pregnant women about the risks of its use. Searches were carried out in the electronic databases SciELO, PubMed, MEDLINE, LILACS, CAPES and Google Scholar. Results indicated that plants such as mountain arnica (Arnica montana), mugwort (Artemisia vulgaris), fringed rue (Ruta chalepensis / Ruta graveolens), "Barbatimão" (Stryphnodendron polyphyllum) and "Boldo" (Vernonia condensata) are likely to generate such an effect. This study shows that for most medicinal plants there are not data regarding the safety of their use during pregnancy.