Os efeitos da alta temperatura e do myleran (busulfan) na espermatogênese de Devario aequipinnatus (teleostei, cyprinidae)

Pós-graduação em Ciência e Tecnologia Animal - FEIS

Qualidade e alterações estruturais do café arábica submetido a alternância da temperatura na secagem

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Perfil hemostático e hematológico de equinos com compactação de cólon maior submetidos ao tratamento medicamentoso

Pós-graduação em Medicina Veterinária - FCAV

Estudo dos efeitos do tamanho e comensurabilidade nas correntes críticas em fitas supercondutoras do tipo II com redes periódicas de pinnings à temperatura finita

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Efeito do teor de água na avaliação da compactação do solo causada pelo tráfego agrícola e seu reflexo nos atributos físicos do solo

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Influência da temperatura na atividade de amilase e protease de Rhizopus oligosporus cultivado por fermentação em estado sólido

Amilases e proteases constituem um dos principais grupos de enzimas industriais pelo seu amplo espectro de aplicações biotecnológicas. Elas podem ser obtidas a partir de fontes microbianas e com altos rendimentos por processos de fermentação em estado sólido (FES). Conhecer as características bioquímicas das enzimas é fundamental para adequação aos processos industriais. O objetivo do trabalho foi determinar a melhor temperatura para atividade das enzimas amilase e protease de Rhizopus oligosporus obtidas por fermentação em estado sólido utilizando farelo de trigo como substrato. Os melhores valores para atividade amilolítica e proteolítica foram obtidos nas temperaturas de 55 - 65 °C e de 50 - 60 °C, respectivamente. Estes resultados sugerem que as enzimas estudadas podem ser utilizadas em processos que empregam elevadas temperaturas.

Preparo do solo e emissão de CO2, temperatura e umidade do solo em área canavieira

Soil tillage is one of the agricultural practices that may contribute to increase the loss of carbon through emission of CO2 (FCO2). The aim of this study was to investigate the effect of three soil tillage systems on FCO2, soil temperature and soil moisture in a sugarcane area under reform. The experimental area consisted of three tillage plots: conventional tillage (CT), conventional subsoiling (CS), and localized subsoiling (LS). FCO2, soil temperature and soil moisture were measured over a period of 17 days. FCO2 showed the highest value in CT (0.75 g CO2 m(-2) h(-1)). Soil temperature presented no significant difference (p > 0.05) between LS (26.2 degrees C) and CS (25.9 degrees C). Soil moisture was higher in LS (24%), followed by CS (21.8%) and CT (18.3%). A significant correlation (r = -0.71; p < 0.05) between FCO2 and soil temperature was observed only in CT. The conventional tillage presented a total emission (2,864.3 kg CO2 ha(-1)) higher than the emissions observed in CS (1,970.9 kg CO2 ha(-1)) and LS (1,707.7 kg CO2 ha(-1)). The conversion from CT to LS decreased soil CO2 emissions, reducing the contribution of agriculture in increasing the concentration of greenhouse gases in the atmosphere.

Perfil hematológico de tilápias-do-nilo alimentadas com dietas contendo diferentes lipídeos e estimuladas por baixa temperatura

The goal of this paper was to determine the effects of seven diets with differents fatty acids sources in hematology of Nile tilapia before and after cold stimulus. Seven diets, with 3% of fatty acid source, were formulated: soybean oil (OS); fish oil (OP); beef tallow (SB) and mixtures of OS+OP; OS+SB; OP+SB e OS+OP+SB. Fish (112 male of Nile tilapia of 30,0 +/- 2,65g) were totally randomly distributed, with four replicates, into 28 plastic aquaria (40 L; 4 fish per aquarium). Fish were fed four times per day for 35 days. At 35th day and also after seven days cold stimulus blood was collected and the profile hematological was evaluated. Leucocytes numbers were reduced in fish fed a SB and fish oil combination diet and were highest in fish fed SB diet before cold stimulus. Plasma protein was reduced in fish fed soybean oil diets and highest in fishes fed a combination of soybean oil, fish oil and SB diets. Anything fatty acids source promotes effective changes in fish health and cold tolerance promotion. Cold don't drastically reduced fish general health status.

Produção de chapas de partículas com resíduos de madeira Cordia goeldiana

The aim of this research consisted in the use of wastes from tropical wood (Cordia goeldiana) with low density and the polyurethane resin (mono and bicomponent) castor oil based in the manufacture of particleboards, generating subsidies as application in rural and civil construction, as well in the furniture industry. The particleboards were manufactured with 15% of polyurethane resin content (one part of pre-polymer and one part of polyol), compaction pressure of 4MPa, pressing temperature of 90 degrees C and press time of 7 minutes. The physical and mechanical properties investigated were density, moisture content, strength modulus in bending and internal bond, both obtained according to the recommendations of the Brazilian standard ABNT NBR 14810:2002. The mean values obtained for these properties were systematically superior to the Brazilian standard requirement. This point showed that it is possible the use of Cordia goeldiana wastes in the particleboard production. We confirmed the hypothesis of a significant linear relation between density and the internal bond of the panels, allowing the estimation of the internal bond of particleboards.

Influência da temperatura de armazenamento na qualidade das inflorescências de estrelítzia (strelitzia reginae banks ex aiton)

This work was based to study the influence of the storage temperature (cold and room temperature) in the quality of inflorescences strelitzia. The scapes were selected, labeled and there were zero problems concerning mechanical damage, disease and/or plagues. Subsequently this period, the scapes were moved randomly to recipients with water, in which two postharvest trials were conducted. In experiment 1, the flower scapes were placed in buckets with water from public supply and sanitation department and taken to a cold room at temperature of 7.5 degrees C and RH of 90%, for a twelve day period. For the experiment 2, were kept under the same conditions but at room temperature for a period of six days. In both experiments, the visual analysis: color, gloss, stains (by assigning notes), opening and drop florets (count) were evaluated at intervals of four days in cold and every 48 hours at ambient temperature conditions. In both experiments, the visual analysis: color, gloss, stains (by assigning notes), opening and drop florets (count) were evaluated at intervals of four days in cold and every 48 hours at ambient temperature conditions. The sepal is the organ that showed greater loss in coloration. The variable gloss showed the same pattern for the two experiments. Incidences of stains on the inflorescences occurred in patches at room temperature. The scapes increased number of florets open in cold. This tendency did not occur at room temperature. No were observed differences in the fall of florets. Conclude that the storage temperature does not contribute to postharvest quality of strelitzia.

Desenvolvimento de um sistema de SHM sem fio e com compensação automática de temperatura

Pós-graduação em Engenharia Elétrica - FEIS