Metals as Catalysts for Ozonation

Ozonation is an efficient process for water and wastewater treatment, widely used for the disinfection and oxidation of organic pollutants. This process is effective, however, some pollutants are ozone-resistant. For better oxidation, enhanced production of hydroxyl radicals (HO•) can be obtained through the transition metals insertion in solution, known as homogeneous catalytic ozonation. These metals may react directly with O3 to produce HO• or interact with organics such as humic substances in the water matrix to promote O3 transformation to HO•. In this chapter, a short review of the homogeneous catalytic ozonation, including key aspects, such as pH effect, metals concentration, catalytic mechanisms, drawbacks of the homogeneous catalytic ozonation application, and the possible solution for it was provided

Synthesis, characterization, and photocatalytic activity of pure and N-, B-, or Ag- Doped TiO2

This article reports the synthesis and characterization of pure and N-, B-, and Ag-doped TiO2 and the ability of these oxides to photodegrade methylene blue (MB) under sunlight or UV-ABC radiation. The compounds were synthesized using the sol-gel method and characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. Photocatalytic efficiency was significantly increased by N-doping, resulting in 98% MB decomposition under UV-ABC irradiation for 180 min. Ag- and B-doped TiO2 lowered MB degradation rates to 52 and 73%, respectively, compared with pure TiO2. The same behavior was observed with exposure to UV-Vis, with 88, 65, 60, and 42% MB removal with N-doped, pure, B-doped, and Ag-doped TiO2, respectively. Under visible light alone, N-doped TiO2 exhibited higher photocatalytic efficiency than commercial P25-type TiO2. Photocatalysis with N-doped TiO2 proved to be a promising alternative for MB degradation, given the potential of employing solar energy, thus minimizing operating costs

Reuse of regional residues as substrate for production of seedlings of lettuce cultivares proceeding from non and with pelleted seeds

O objetivo do trabalho consistiu em avaliar o desenvolvimento de mudas de diferentes cultivares de alface oriundas de sementes não peletizadas e peletizadas, cultivadas em diferentes substratos hortícolas. O experimento foi conduzido sob telado com 50% de sombreamento. Os tratamentos foram distribuídos em esquema fatorial 2x3x5, referentes à dois tipos de sementes (não peletizadas e peletizadas), três cultivares de alface (‘Delicía’, ‘Babá de Verão’ e ‘Itapuã 401’) e cinco substratos, sendo eles, substrato comercial (vermiculita); paú de buriti (Mauritia flexuosa); resíduo de carnaúba (Copernicia prunifera) + casca de arroz (Oriza sativa); resíduo de carnaúba em pó e resíduo de carnaúba semidecomposto. O delineamento experimental adotado foi em blocos ao acaso, com três repetições. Na execução do experimento foram registrados: porcentagem de emergência das plântulas e índice de velocidade de emergência. Ao término, foram determinados altura da parte aérea das mudas; número de folhas; comprimento da maior raiz; volume de raízes; massa seca da parte aérea e das raízes; estabilidade do torrão; e, área foliar. Sementes peletizadas proporcionam melhor formação e desenvolvimento de mudas de alface. As cultivares ‘Delícia’, ‘Babá de Verão’ e ‘Itapuã 401’ são influenciados pelo tipo de semente e substrato. O material resíduo de carnaúba com casca de arroz (RCCA) pode ser utilizado para produção de mudas de alface com qualidade, sendo um substituto ao substrato comercial.The objective of this work was to evaluate development of seedlings of different lettuce cultivars proceeding from non pelleted and pelleted seeds, grown in different substrates. The experiment was conducted in greenhouse with 50% shade. The treatments resulting from a factorial design 2x3x5, corresponding to two types of seeds (non pelleted and pelleted), three lettuce cultivars (‘Delicía’, ‘Babá de Verão’ and ‘Itapuã 401’) and five substrates, namely, commercial substrate (vermiculite); ‘paú’ of Buriti (Mauritia flexuosa); carnauba residue (Copernicia prunifera) + rice husk (Oryza sativa); carnauba residue powder and partially decayed carnauba residue. The experimental design was a randomized block with three replicates. During the conduction of the experiment emergence percentage and seedling emergence speed index were recorded. At the end, the following parameters were determined: the aerial part of the seedlings height; leaves number; roots length; root volume; shoots and roots dry weight; stability turf and leaf area. Pelleted seeds provide better formation and development of lettuce seedlings. Cultivars ‘Delicía’, ‘Babá de Verão’ and ‘Itapuã 401’are influenced by the type of seed and substrate. The carnauba residue plus rice husk material (RCCA) can be used for producing quality lettuce seedlings, resulting in a substitute for commercial substrate.Facultad de Ciencias Agrarias y Forestale

Evaluation of the efficacy and safety of endovascular management for transplant renal artery stenosis

OBJECTIVES: To evaluate the safety and efficacy of endovascular intervention with angioplasty and stent placement in patients with transplant renal artery stenosis. METHODS: All patients diagnosed with transplant renal artery stenosis and graft dysfunction or resistant systemic hypertension who underwent endovascular treatment with stenting from February 2011 to April 2016 were included in this study. The primary endpoint was clinical success, and the secondary endpoints were technical success, complication rate and stent patency. RESULTS: Twenty-four patients with transplant renal artery stenosis underwent endovascular treatment, and three of them required reinterventions, resulting in a total of 27 procedures. The clinical success rate was 100%. All graft dysfunction patients showed decreased serum creatinine levels and improved estimated glomerular filtration rates and creatinine levels. Patients with high blood pressure also showed improved control of systemic blood pressure and decreased use of antihypertensive drugs. The technical success rate of the procedure was 97%. Primary patency and assisted primary patency rates at one year were 90.5% and 100%, respectively. The mean follow-up time of patients was 794.04 days after angioplasty. CONCLUSION: Angioplasty with stent placement for the treatment of transplant renal artery stenosis is a safe and effective technique with good results in both the short and long term

Exposure to maltreatment and urban violence in children working on the streets in São Paulo, Brazil: factors associated with street work

Objective: To quantitatively study the exposure to childhood maltreatment and urban violence in children from families with at least one child working on the streets and to investigate the relationship between these factors and street work. Methods: Families who participated in a nongovernmental organization (NGO) program to eliminate child labor were included. Data concerning sociodemographic characteristics, punishment methods used in the family environment against the children, five types of abuse and neglect perpetrated by the caregivers, urban violence exposure and family functioning were collected. Results: The sample included 126 children who were working on the streets and 65 siblings who were not working on the streets. Caregivers reported high levels of severe physical punishment. The children reported high levels of abuse and neglect, and high levels of urban violence exposure. The families showed a predominance of dysfunctional and unsatisfactory relationships. A multiple logistic regression model showed that age older than 12 years and severe physical punishment at home were associated with street work. Conclusion: Interventions to decrease the risk of child street work should be family-focused and should aim to reduce violence in the family environment.Universidade Federal de São Paulo (UNIFESP) Department of PsychiatryUniversidade Estadual de São Paulo (UNESP) Mathematics and Statistics InstituteUniversidade Presbiteriana Mackenzie Graduate Program in Developmental DisordersPontifícia Universidade Católica do Rio Grande do Sul (PUCRS) Graduate Department of PsychologyRUKHA Institute and Center for Studies and Research in Neuropsychoanalysis (CEINP)UNIFESP, Department of PsychiatrySciEL

The Microbiome of Brazilian Mangrove Sediments as Revealed by Metagenomics

Here we embark in a deep metagenomic survey that revealed the taxonomic and potential metabolic pathways aspects of mangrove sediment microbiology. The extraction of DNA from sediment samples and the direct application of pyrosequencing resulted in approximately 215 Mb of data from four distinct mangrove areas (BrMgv01 to 04) in Brazil. The taxonomic approaches applied revealed the dominance of Deltaproteobacteria and Gammaproteobacteria in the samples. Paired statistical analysis showed higher proportions of specific taxonomic groups in each dataset. The metabolic reconstruction indicated the possible occurrence of processes modulated by the prevailing conditions found in mangrove sediments. In terms of carbon cycling, the sequences indicated the prevalence of genes involved in the metabolism of methane, formaldehyde, and carbon dioxide. With respect to the nitrogen cycle, evidence for sequences associated with dissimilatory reduction of nitrate, nitrogen immobilization, and denitrification was detected. Sequences related to the production of adenylsulfate, sulfite, and H2S were relevant to the sulphur cycle. These data indicate that the microbial core involved in methane, nitrogen, and sulphur metabolism consists mainly of Burkholderiaceae, Planctomycetaceae, Rhodobacteraceae, and Desulfobacteraceae. Comparison of our data to datasets from soil and sea samples resulted in the allotment of the mangrove sediments between those samples. The results of this study add valuable data about the composition of microbial communities in mangroves and also shed light on possible transformations promoted by microbial organisms in mangrove sediments

Comparative assessment of mortality risk factors between admission and follow-up models among patients hospitalized with COVID-19

Objectives: This study aimed to compare differences in mortality risk factors between admission andfollow-up incorporated models.Methods: A retrospective cohort study of 524 patients with confirmed COVID-19 infection admitted to atertiary medical center in São Paulo, Brazil from 13 March to 30 April 2020. Data were collected onadmission, and the third, eighth and fourteenth days of hospitalization. The hazard ratio (HR) wascalculated and 28-day in-hospital mortality risk factors were compared between admission and follow-up models using a time-dependent Cox regression model.Results: Of 524 patients, 50.4% needed mechanical ventilation. The 28-day mortality rate was 32.8%.Compared with follow-up, admission models under-estimated the mortality HR for peripheral oxygensaturation 100 bpm (1.19 versus 2.04), respiratory rate >24/min (1.01versus 1.82) and mechanical ventilation (1.92 versus 12.93). Low oxygen saturation, higher oxygensupport and more biomarkers–including lactate dehydrogenase, C-reactive protein, neutrophil-lymphocyte ratio, and urea remained associated with mortality after adjustment for clinical factorsat follow-up compared with only urea and oxygen support at admission.Conclusions: The inclusion of follow-up measurements changed mortality hazards of clinical signs andbiomarkers. Low oxygen saturation, higher oxygen support, lactate dehydrogenase, C-reactive protein,neutrophil-lymphocyte ratio, and urea could help with prognosis of patients during follow-up