Abstract In Argentina, hemolytic uremic syndrome (HUS) caused by Shiga toxin-producing Escherichia coli (STEC-HUS) infection is endemic, and reliable data about prevalence and risk factors have been available since 2000. However, information about STEC-associated bloody diarrhea (BD) is limited. A prospective study was performed during the period October Surveillance; 2018-June 2019 in seven tertiary-hospitals and 18 referral units from different regions, aiming of STEC-HUS cases in the same hospitals and during the same period were also assessed. Twenty-nine (4.1%) of the BD patients were STEC-positive, as determined by the Shiga Toxin Quik Chek (STQC) test and/or the multiplex polymerase chain reaction (mPCR) assay. The highest fre-quencies were found in the Southern region (Neuquén, 8.7%; Bahía Blanca, 7.9%), in children between 12 and 23 month of age (8.8%), during summertime. Four (13.8%) cases progressed to HUS, three to nine days after diarrhea onset. Twenty-seven STEC-HUS in children under 5 years of age (77.8%) were enrolled, 51.9% were female; 44% were Stx-positive by STQC and all by mPCR. The most common serotypes were O157:H7 and O145:H28 and the prevalent geno-types, both among BD and HUS cases, were sfx2a-only or -associated. Considering the endemic behavior of HUS and its high incidence, these data show that the rate of STEC-positive cases is low among BD patients. However, the early recognition of STEC-positive cases is important for patient monitoring and initiation of supportive treatment.

Resumen En Argentina, el síndrome urémico hemolítico asociado a Escherichia coli productor de toxina Shiga (STEC-SUH) es endémico y, desde 2000, de notificación obligatoria. Sin embargo, la información sobre diarrea sanguinolenta (DS) asociada a STEC (DS-STEC) es limitada. Se realizó un estudio prospectivo desde octubre de 2018 hasta junio de 2019 en siete hospitales de tercer nivel y 18 unidades de referencia de diferentes provincias argentinas, con el objetivo de determinar la frecuencia de casos de DS-STEC en 714 niños de 1 a 9 años que tuvieron DS (I) y la tasa de progresión de DS a SUH en dicha cohorte (II). También se evaluó el número y distribución regional de casos de STEC-SUH en los mismos hospitales en dicho período. Veintinueve casos de DS (4,1%) fueron STEC-positivos, determinados por Shiga Toxin Quik Chek (STQC) o PCR múltiple (mPCR). Las frecuencias más altas se encontraron en el sur del área relevada (Neuquén, 8,7%; Bahía Blanca, 7,9%), en niños de 12 a 23 meses (8,8%), en verano. Cuatro casos de DS-STEC (13,8%) progresaron a SUH, de tres a nueve días después del inicio de la diarrea. Se registraron 27 niños con STEC-SUH, estos fueron mayoritariamente <5 anos (77,8%) del sexo femenino (51,9%). El 44% de estos casos fueron Stx-positivos por STQC y todos por mPCR. Los serotipos más comunes fueron O157:H7y O145:H28, y el genotipo predominante fue stx2a, solo o asociado, en DS y SUH. Considerando el comportamiento endémico del SUH y su alta incidencia, estos datos muestran que la tasa de casos de DS-STEC es baja. Sin embargo, su reconocimiento temprano es importante para el seguimiento e inicio del tratamiento de sostén.

RESUMO Este trabalho tem como objetivo entender a influência da oxidação nos fios de cobre e seus impactos em materiais soldados através do processo ultrassônico em componentes automotivos. 42 (quarenta e duas) amostras de cobre foram extraídas e subdividas em 7 (sete) grupos com 6 (seis) amostras cada um para o experimento, onde o primeiro grupo contou com amostras sem oxidação e o último grupo conta com amostras que foram envelhecidas em 360 dias. Estas amostras foram soldadas através do processo ultrassom com parâmetros que garantiram os requisitos mínimos de soldabilidade, critérios visuais e a união completa dos filamentos de cobre na junta. Após isso, os materiais soldados foram submetidos a validação da soldagem através da medição da força de tração de cisalhamento para garantir os requisitos mínimos exigidos por norma interna do setor automotivo. As amostras sem oxidação atenderam aos parâmetros de engenharia e resultaram nos maiores valores de força de tração de cisalhamento. Nas amostras com presença de oxidação, o aumento da energia de soldagem proporcionou a redução da força de cisalhamento dos 6 (seis) grupos, apresentando 1 amostra que ficou abaixo do parâmetro mínimo estabelecido para força de cisalhamento. automotivos 4 quarenta duas sete (sete seis (seis experimento 36 dias soldabilidade junta isso automotivo 3

ABSTRACT The main objective of this work is to understand the influence of oxidation on copper wires and its impacts on materials welded through the ultrasonic process in automotive components. 42 (forty-two) copper samples were extracted and subdivided into 7 (seven) groups with 6 (six) samples each for the experiment, where the first group had samples without oxidation and the last group had samples that were aged in 360 days. These samples were welded through the ultrasonic process with parameters that ensured the minimum requirements for solderability, visual criteria and the complete union of the copper filaments in the joint. After that, the welded materials were submitted to welding validation by measuring the shear traction force to guarantee the minimum requirements demanded by the internal standard of the automotive sector. The samples without oxidation met the engineering parameters and resulted in the highest values of shear tensile strength. In the samples with the presence of oxidation, the increase in welding energy provided a reduction in the shear force of the 6 (six) groups, with 1 sample that was below the minimum parameter established for shear force. components 4 fortytwo forty two (forty-two seven (seven six (six experiment 36 days solderability joint sector strength 3

RESUMO A competitividade do setor florestal brasileiro, fruto das condições climáticas e tecnologia empregada, faz que o país ocupe posição de destaque no cenário mundial. Apesar do elevado crescimento brasileiro no setor florestal, é necessário o desenvolvimento de pesquisas que proporcionem aumento de produtividade. Este estudo objetivou avaliar o efeito fisiológico da aplicação de diferentes concentrações de giberelina (GA3) no acúmulo de biomassa do híbrido de Eucalyptus grandis x Eucalyptus urophylla "E. urograndis GG 100" e, também, verificar o efeito da aplicação de hormônio sobre a incidência de Rhizoctonia sp. e sobre efeito antixenose (não preferência) ao corte de folhas pela formiga-cortadeira Atta sexdens rubropilosa. O experimento foi conduzido em bancada a pleno sol, seguindo o delineamento inteiramente casualizado com cinco tratamentos e seis repetições. Mudas clonadas de E. urograndis GG 100, com 120 dias de idade, cultivadas sob bancada a pleno sol em vasos de 12 L, com substrato à base de subsolo, areia e esterco foram tratados com 50 mL de GA3, nas seguintes concentrações: 0; 50; 100; 150; e 200 mg L-1. Aos 40 dias após a imposição dos tratamentos, as análises foram realizadas. A aplicação de giberelina intensificou o crescimento vegetativo das plantas de eucalipto e promoveu o maior acúmulo de biomassa no mesmo período de tempo de plantas não tratadas. As mudas tratadas com giberelina apresentaram vigoroso crescimento vegetativo, principalmente na concentração de 150 mg L-1. Adicionalmente, as mesmas plantas exibiram maior preferência por formigas-cortadeiras e menor área foliar lesionada pelo fungo Rhizoctonia sp.

ABSTRACT The competitiveness of the forest sector in Brazil, as a result of climate conditions and technology used, makes the country occupy a prominent position on the world. Despite the high Brazilian growth in the forest sector, the development of research that provide increased productivity is necessary. This study aimed to evaluate the physiological effect of the application of gibberellic acid (GA3) in the accumulation of biomass of Eucalyptus grandis x Eucalyptus urophylla "E. urograndis GG 100" hybrid and also to verify the effect of this hormone application on the incidence of Rhyzoctonia sp. besides the antixenosis effect (not preferred) on the leaves by leaf-cutting ant Atta sexdens rubropilosa. The experiment was conducted in a bench, full sun, following a completely randomized design with five treatments and six replications. Cloned E. urograndis GG 100 seedlings, 120 days old, grown under full sun bench in 12 liter pots with a substrate based on subsoil, sand and manure were treated with 50 ml of GA3 according to following concentrations: 0, 50, 100, 150 and 200 mg L-1. Analyzes were performed 40 days after treatment imposition. The application of gibberellin intensified vegetative growth of Eucalyptus plants and promoted a greater accumulation of biomass than untreated plots in the same period of time. Seedlings treated with gibberellin showed vigorous vegetative growth, especially in the concentration of 150 mg L-1. In addition, the same plants exhibited higher preference to leaf-cutting ants and smaller leaf area damaged by fungus Rhizoctonia sp.