Propriedades de concretos produzidos com fresa de asfalto em substituição ao agregado miúdo

O constante aumento de manutenção de rodovias asfaltadas resulta em alta geração de resíduos. A preocupação com o meio ambiente e a redução de recursos naturais disponíveis têm levado à busca por materiais mais sustentáveis. Já se tem estudos e aplicações que analisam a viabilidade e os benefícios da utilização do resíduo de fresagem de asfalto no próprio pavimento, como reforço do subleito, sub-base e base da via. Há também estudos que verificam a substituição de agregado natural por agregado de fresagem na composição do concreto.  Desta forma, o presente estudo tem por objetivo avaliar a influência da utilização de agregados graúdos reciclados com diferentes teores de substituição do agregado graúdo na produção de concretos. Será avaliado o comportamento do material no estado fresco, quanto a sua trabalhabilidade, e no estado endurecido, avaliando a resistência à compressão, módulo de elasticidade e absorção de água por imersão e capilaridade. O estudo tem como resultados esperados a produção de concretos reciclados com fresagem asfáltica que atendam aos requisitos de resistência mecânica apresentados pela NBR 12655:2015 e que apresentem absorção de água em níveis similares ao do concreto de referência

APPROACH AND TREATMENT OF NON-MELANOMA SKIN CANCER DURING PREGNANCY

Pregnancy presents unique challenges in diagnosing and treating non-melanoma skin cancer, the most common type of skin cancer. Hormonal and immunological changes during pregnancy can influence the development and progression of the disease, while ethical issues and concerns about fetal safety complicate the therapeutic approach. Therefore, it is crucial to understand how this condition is managed during pregnancy to ensure the best outcome for mother and baby. Objective: The objective of this systematic literature review is to analyze the approaches and treatments used for non-melanoma skin cancer during pregnancy, with a focus on maternal and fetal safety. Methodology: The review followed the PRISMA checklist guidelines. Articles published in the last 10 years were searched in the PubMed, Scielo and Web of Science databases. The descriptors used were "non-melanoma skin cancer", "pregnancy", "treatment", "approach" and "fetal safety". The inclusion criteria were studies that described cases of non-melanoma skin cancer during pregnancy, addressing treatment options and fetal safety considerations. The exclusion criteria were studies irrelevant to the topic, studies without access to the full text and studies not available in English, Portuguese or Spanish. Results: Analysis of the articles revealed several therapeutic approaches for non-melanoma skin cancer during pregnancy, including surgery, photodynamic therapy and cryotherapy. There was an emphasis on the individualized assessment of each case, taking into account the stage of the disease, the location of the tumor and the potential risks for the mother and fetus. Prevention was also highlighted, with an emphasis on sun protection and skin self-examination. However, some treatments have been delayed until after birth due to concerns about fetal safety. Conclusion: The management of non-melanoma skin cancer during pregnancy requires a multidisciplinary and individualized approach, considering the risks and benefits for the mother and fetus. Prevention, early diagnosis and adequate treatment are essential to guarantee the best result for both. More research is needed to further guide clinical practices in this area.Pregnancy presents unique challenges in diagnosing and treating non-melanoma skin cancer, the most common type of skin cancer. Hormonal and immunological changes during pregnancy can influence the development and progression of the disease, while ethical issues and concerns about fetal safety complicate the therapeutic approach. Therefore, it is crucial to understand how this condition is managed during pregnancy to ensure the best outcome for mother and baby. Objective: The objective of this systematic literature review is to analyze the approaches and treatments used for non-melanoma skin cancer during pregnancy, with a focus on maternal and fetal safety. Methodology: The review followed the PRISMA checklist guidelines. Articles published in the last 10 years were searched in the PubMed, Scielo and Web of Science databases. The descriptors used were "non-melanoma skin cancer", "pregnancy", "treatment", "approach" and "fetal safety". The inclusion criteria were studies that described cases of non-melanoma skin cancer during pregnancy, addressing treatment options and fetal safety considerations. The exclusion criteria were studies irrelevant to the topic, studies without access to the full text and studies not available in English, Portuguese or Spanish. Results: Analysis of the articles revealed several therapeutic approaches for non-melanoma skin cancer during pregnancy, including surgery, photodynamic therapy and cryotherapy. There was an emphasis on the individualized assessment of each case, taking into account the stage of the disease, the location of the tumor and the potential risks for the mother and fetus. Prevention was also highlighted, with an emphasis on sun protection and skin self-examination. However, some treatments have been delayed until after birth due to concerns about fetal safety. Conclusion: The management of non-melanoma skin cancer during pregnancy requires a multidisciplinary and individualized approach, considering the risks and benefits for the mother and fetus. Prevention, early diagnosis and adequate treatment are essential to guarantee the best result for both. More research is needed to further guide clinical practices in this area

The complete genome sequence of Chromobacterium violaceum reveals remarkable and exploitable bacterial adaptability

Chromobacterium violaceum is one of millions of species of free-living microorganisms that populate the soil and water in the extant areas of tropical biodiversity around the world. Its complete genome sequence reveals (i) extensive alternative pathways for energy generation, (ii) ≈500 ORFs for transport-related proteins, (iii) complex and extensive systems for stress adaptation and motility, and (iv) wide-spread utilization of quorum sensing for control of inducible systems, all of which underpin the versatility and adaptability of the organism. The genome also contains extensive but incomplete arrays of ORFs coding for proteins associated with mammalian pathogenicity, possibly involved in the occasional but often fatal cases of human C. violaceum infection. There is, in addition, a series of previously unknown but important enzymes and secondary metabolites including paraquat-inducible proteins, drug and heavy-metal-resistance proteins, multiple chitinases, and proteins for the detoxification of xenobiotics that may have biotechnological applications

Consulta à comunidade discente do curso de biblioteconomia da UFRGS

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Consulta à comunidade discente do curso de biblioteconomia da UFRGS

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Implementation of a Brazilian Cardioprotective Nutritional (BALANCE) Program for improvement on quality of diet and secondary prevention of cardiovascular events: A randomized, multicenter trial

Background: Appropriate dietary recommendations represent a key part of secondary prevention in cardiovascular disease (CVD). We evaluated the effectiveness of the implementation of a nutritional program on quality of diet, cardiovascular events, and death in patients with established CVD. Methods: In this open-label, multicenter trial conducted in 35 sites in Brazil, we randomly assigned (1:1) patients aged 45 years or older to receive either the BALANCE Program (experimental group) or conventional nutrition advice (control group). The BALANCE Program included a unique nutritional education strategy to implement recommendations from guidelines, adapted to the use of affordable and regional foods. Adherence to diet was evaluated by the modified Alternative Healthy Eating Index. The primary end point was a composite of all-cause mortality, cardiovascular death, cardiac arrest, myocardial infarction, stroke, myocardial revascularization, amputation, or hospitalization for unstable angina. Secondary end points included biochemical and anthropometric data, and blood pressure levels. Results: From March 5, 2013, to Abril 7, 2015, a total of 2534 eligible patients were randomly assigned to either the BALANCE Program group (n = 1,266) or the control group (n = 1,268) and were followed up for a median of 3.5 years. In total, 235 (9.3%) participants had been lost to follow-up. After 3 years of follow-up, mean modified Alternative Healthy Eating Index (scale 0-70) was only slightly higher in the BALANCE group versus the control group (26.2 ± 8.4 vs 24.7 ± 8.6, P <.01), mainly due to a 0.5-serving/d greater intake of fruits and of vegetables in the BALANCE group. Primary end point events occurred in 236 participants (18.8%) in the BALANCE group and in 207 participants (16.4%) in the control group (hazard ratio, 1.15; 95% CI 0.95-1.38; P =.15). Secondary end points did not differ between groups after follow-up. Conclusions: The BALANCE Program only slightly improved adherence to a healthy diet in patients with established CVD and had no significant effect on the incidence of cardiovascular events or death. © 2019 The Author