Post-partum follicular dynamics in beef cows calving during spring and autumn in southern Brazil.

Ovarian activity early post-partum in beef cows with intermediate body condition scores that calved during spring and autumn and treated with either 48 h of temporary weaning or exogenous hormones was investigated. Calving cows were given body condition scores and their ovaries were ultrasonographically scanned daily starting on day ten postpartum. The number and size of the follicles were recorded. Upon detection of a dominant follicle (>9 mm), the animals were distributed to different treatments. Over 80% of the animals (41/49) in both seasons presented a dominant follicle during the second or third week post-partum. The percentage of cows ovulating within seven days after treatment varied from 30% (3/10) for control cows to 60% (6/10) for MAP+GnRH treated cows for both spring and autumn calving cows. A reduction of 16% and 19% in body condition score was observed during the post-partum period studied for both spring and autumn calving cows, respectively. The decrease in body condition score was accompanied by a reduction in the follicular population of 43% during the fifth week post-partum only in those calving during autumn. In the spring calving cows, no change was detected in the follicular population despite the decrease in body condition score. Irrespective of the differences in environmental conditions between the two breeding seasons, cows present large follicles in their ovaries that are capable of responding to hormonal treatments, during the early post-partum period.Doc 1. Disponível em: . Acesso em: 27 ago. 2018

Reação à brusone de genótipos de trigo do programa de melhoramento da Embrapa Trigo no estádio de planta adulta.

bitstream/CNPT-2010/40337/1/p-bp64.pd

Avaliação sorológica, clínica e epidemiológica da toxocaríase em áreas urbanas do sul do Brasil

Toxocariasis is a worldwide public-health problem that poses major risks to children who may accidentally ingest embryonated eggs of Toxocara. The objectives of this study were to investigate the occurrence of anti-Toxocara spp. antibodies in children and adolescents and the variables that may be involved, as well as environmental contamination by Toxocara spp. eggs, in urban recreation areas of north central mesoregion, Paraná State, Brazil. From June 2005 to March 2007. a total of 376 blood samples were collected by the Public Health Service from children and adolescents one to 12 years old, of both genders. Samples were analyzed by the indirect ELISA method for detection of anti-Toxocara antibodies. Serum samples were previously absorbed with Ascaris suum antigens, and considered positive with a reagent reactivity index >;1. Soil samples from all of the public squares and schools located in the four evaluated municipalities that had sand surfaces (n = 19) or lawns (n = 15) were analyzed. Of the 376 serum samples, 194 (51.6%) were positive. The seroprevalence rate was substantially higher among children aging one to five years (p = 0.001) and six to eight years (p = 0.022). The clinical signs and symptoms investigated did not show a statistical difference between seropositive and seronegative individuals (p >; 0.05). In 76.5% of the investigated recreation places, eggs of Toxocara were detected in at least one of the five collected samples. Recreation areas from public schools were 2.8 times more contaminated than from public squares. It is important to institute educational programs to inform families and educators, as well as to improve sanitary control of animals and cleaning of the areas intended for recreation in order to prevent toxocariasis.A toxocaríase é um problema de saúde pública mundial, com maior risco para crianças que podem, acidentalmente, ingerir ovos embrionados de Toxocara spp.. Os objetivos deste estudo foram avaliar a ocorrência de anticorpos anti-Toxocara spp. em crianças e adolecentes e as variáveis que podem estar envolvidas, bem como a contaminação ambiental por ovos de Toxocara spp., em locais de recreação, em áreas urbanas da mesorregião norte central, Paraná, Brasil. De junho de 2005 a março de 2007 foram coletadas 376 amostras de sangue de crianças e adolescentes de um a doze anos, de ambos os sexos, atendidas pelo Sistema Único de Saúde. As amostras foram analisadas pelo método de ELISA indireto para detecção de IgG anti-Toxocara e previamente absorvidas com antígeno de Ascaris suum. Foram consideradas reagentes as amostras com índice de reatividade >; 1. A análise das amostras de areias (n = 19) e gramados (n = 15) de cada município foi realizada em todas as praças e escolas públicas. Das 376 amostras de soro, 194 (51,6%) foram positivas. A taxa de soroprevalência foi substancialmente mais elevada entre as crianças na faixa etária de até um a cinco (p = 0.001) e de seis a oito anos de idade (p = 0,022). Os sinais e sintomas clínicos investigados não mostraram diferenças estatísticas entre soropositivos e soronegativos (p >; 0,05). Em 76,5% dos locais de recreação investigados, ovos de Toxocara foram detectados em pelo menos uma das cinco amostras. Os locais de recreação das escolas públicas estavam 2,8 vezes mais contaminados do que as praças. É importante a realização de programas educativos junto às famílias e educadores, o controle sanitário de animais e a higienização dos locais destinados à recreação para prevenção da toxocaríase

Design and Development of a Magnus Hydrokinetic Rotor

The energy matrix diversification has become noticed in the latest years. Energy conversion of the free flow in rivers and canals into electrical energy has been a good complementation for the conventional generation. The first application of hydrokinetic turbines, commercially, were in Mississippi's river (Minnesota, USA), in 2008. The USAge of Magnus effect in hydrokinetic turbines occurred in an innovative manner. In this project, rotational cylinders actuate as blades of an axial hydrokinetic rotor, converting kinetic energy of the flow into potency in the rotor axle. This effect was initially observed in 1853 by Henrich Magnus and, since then, few researches were carried out to its application in hydraulic generation of energy. Therefore, tests in reduced-scale prototype and numerical simulations were made for the development and executive design of a hydrokinetic rotor. At the end of this study, a hydro generator with 62% hydraulic efficiency, considering the Betz Limit, was constructed

Feasibility and Environmental Sustainability of a 103.5 kWp floating Photovoltaic Electrical System with a Case Study in a Hydroelectric Power Plant, Santa Clara Hpp, Located in the South of Brazil Region

Typical environmental problems associated with the implementation of solar photovoltaic systems for the generation of peak electrical energy, on a larger scale, such as on the order of 1 MWp, is in the occupied area, usually more than 3 km2. This can be minimized by the use of water parks or water dam’s reservoir, small and large hydroelectric power plants dams. Both the terrestrial and aquatic systems can impact the site, the first one, for the need to promote earthworks, removal of extensive green areas in the surroundings, installation of new transmission line, among others; and the second, despite the fact that a flat surface is already used and that there is no need for new civil procedures for its installation and can normally take advantage of the existing power transmission line, may cause changes in the biota of the reservoir, depending on the shading areas on the surface of the lake. Due to these facts, this research was proposed to investigate, parameterize and tropicalize an electric power generation system based on floating silicon photovoltaic cell panels installed in the Santa Clara HPP reservoir, in terms of peak power, durability, aspects and environmental impacts, with the study of possible evolutionary improvements of the project such as "tracking" or solar tracking, as well as dynamism of the structure, allowing the shadow area to be shifted over time, minimizing its effects in the local biota

Mapeamento da matéria orgânica do solo e da produtividade das culturas como subsídio ao manejo sítio-específico da adubação nitrogenada.

RESUMO – Na recomendação de adubação nitrogenada, a utilização de critérios que permitam estimar com maior precisão o potencial de suprimento de nitrogênio (N) pelo solo pode contribuir para maior eficiência de uso do nutriente nos sistemas agrícolas. No presente trabalho, avaliou-se a possibilidade de espacialização da demanda de N na adubação, por meio de estimativas baseadas em informações georreferenciadas sobre os teores de matéria orgânica do solo (MOS) e a produtividade das culturas numa lavoura de 97 hectares. A partir do mapeamento da MOS e da produtividade das culturas nas três últimas safras, foram feitas estimativas pontuais (considerando uma malha de 20 x 20 m) da quantidade de N suprida pelo solo via mineralização da MOS e decomposição dos restos culturais. Com essas estimativas foram gerados mapas de demanda de N na adubação para duas situações de produtividades esperadas para o milho (10 e 12 t ha-1). A metodologia utilizada permitiu definir zonas contrastantes na lavoura, nas quais o manejo sítio-específico do fornecimento de N poderia, teoricamente, otimizar a adubação. No entanto, a produtividade do milho, adubado com dose uniforme de N na safra 2006/2007, não confirmou potencial de resposta diferenciado nas referidas zonas, possivelmente devido ao fato de as condições ambientais terem favorecido uma produtividade mais homogênea na área. Conclui-se que o mapeamento da MOS e da produtividade das culturas permite obter estimativas espacializadas da necessidade de N na adubação, podendo auxiliar na definição de zonas para manejo sítio-específico da lavoura