Influência de ração balanceada sobre a “cara inchada” (doença peridentária) de bezerros

Two groups of calves, consisting each of 6 and 10 animals respectively and affected by periodontal lesions of "cara inchada" (swollen face), were confined on two farms where the disease occurs and which are situated in the Rondonópoiis area of Mato Grosso, Brazil. The animals received a balanced ration brought into the farm during 5 to 6 months. A significant improvement in the condition of the animals was observed, and the periodontal lesions regressed and healed. The condition of the control animals kept on Panicum maximum pastures on the same farms did not improve, the periodontal lesions persisted or became more severe, and several animals died. The results of this experiment confirm conclusions drawn previously that "cara inchada" in cattle is of alimentary origin and is caused by some factor existing in the pasture of certain areas.Dois lotes de 6 e 10 bezerros desmamados, afetados por lesões peridentárias da "cara inchada", foram confinados em duas fazendas, na região de Rondonópolis, Mato Grosso; durante 5 a 6 meses os animais receberam exclusivamente ração balanceada, adquirida fora da fazenda. Observou-se rápida melhora do estado de nutrição destes animais e houve regressão e reparação das lesões peridentárias. Nos animais de controle, mantidos em pastos de P. maximum nas mesmas duas fazendas, as lesões peridentárias persistiram ou agravaram-se e vários animais morreram. O experimento confirma conclusões, às quais se chegou em trabalhos anteriores, de que a "cara inchada" deve ser causada por fator alimentar existente em certas áreas onde pastejam os bovinos

Efeito da transferência de bovinos com “cara inchada” (doença peridentária) para pastos de região indene

A group of 34 mostly young cattle, affected by the periodontal disease called “cara inchada” (Swollen face) and in bad condition, was transferred from a region where the disease occurs to a farm situated in a healthy region. Half of the cattle survived in spite of their ill health and the adverse conditions of a prolonged draught. Clinical examinations of the buccal cavity of these animals revealed a regression of the periodontal lesions after only 2 months and, in a certain way, a cure of the lesions after 4 to 6 months. Most of the animals improved their condition considerably and their haircoat became less rough. At the beginning and the end of the experiment, four animals were sacrificed for dose macroscopic examination and comparison of the periodontal changes and to collect liver samples for future chemical analyses. The clinical and anatomo-pathological findings in this experiment strengthen the hypothesis that the etiology of "cara inchada" is related to one or more alimentary factors present in the regions where the disease occurs.Um lote de 34 bovinos, na sua maioria jovens, afetados pela "cara inchada", doença peridentária, e em mau estado de nutrição, foi transferido de região de ocorrência da afecção para uma fazenda situada em região indene. A metade dos animais sobreviveu apesar do seu estado debilitado e das condições adversas de uma seca prolongada. Os exames clínicos da cavidade bucal destes animais revelaram redução das lesões peridentárias já após dois meses e, de certa maneira, cura das lesões após quatro a seis meses. Houve também melhora do estado de nutrição da maioria dos animais. No início e no fim do experimento foram necropsiados, em cada época, quatro animais, para caracterizar e comparar melhor as lesões da gengiva e para coleta de amostras de fígado para análises químicas posteriores. Os achados clínicos e anátomo-patológicos neste experimento reforçam a hipótese de que a etiologia da "cara inchada" está ligada à alimentação nas regiões de ocorrência da doença

Características principales de pastas minerales de relaves de manganeso preparadas en espesador de escala de laboratorio

Tailings disposal in the form of mineral slurry has a number of advantages, among which we can highlight the environmental, social, operational and technical nature. This alternative arrangement of the tailings is a technology that has been developed rapidly highlighting the sector thickening equipment manufacturers and transportation. The main objective of this work was to evaluate the production of concentrated suspensions minerals known as pasta tailings from beneficiation processes manganese obtained by a paste thickener scale laboratory. The study includes the characterization of the solid sample, evaluation of flocculation (type and dosage), use of a producer of pulp laboratory scale equipment with a useful capacity of 7 liters for the formation of mineral paste through continuous feed of pulp, evaluation of influence on the solids concentration using generator floc (RGF), characteristics of mineral pulps produced as% of depression or slump, angle of repose or flume, solids concentration profile in the thickener, apparent viscosity and yield stress. Regarding the chemical composition it was obtained which are the predominant elements: Mn, Fe, Si and Al with a distribution fine grain size, represented by a d50 equivalent to 4,63μm. The nonionic flocculant was the one who showed best performance while settling in trials with recirculation pulp and flocculant addition, the best condition was reached for a recirculation of the lower zone and maximum layer Compression (4 to 1) obtaining a value of 53.7% solids by weight. In the continuous trials total duration of 180 minutes, the highest value reached% solids with a slurry feed linear flow was 52.7% for 50 gpt dose of flocculant. In feeding trials using curvilinear RGF a value of 55.5% it was obtained solids by weight; It was verified by means of the concentration profile of the compression zone there is a transitional stage pulp high density mineral pulp in the range of 40 to 45% solids by weight. The manganese tailings slurry form mineral between 47 and 56% solids by weight. They were hit angles of repose in the upper mineral pasta to 8th. The rheological behavior of all the tested pastes presented a mixed nature and reotrópico thixotropic. The yield stress reached values close to 100Pa to 56% solids by weight in the mineral pulp produced using the best operating conditions found in this study.La disposición de relaves en forma de pasta mineral presenta una serie de ventajas, entre las cuales se pueden destacar las de índole ambiental, social, operacional y técnica. Esta alternativa de disposición de los relaves es una tecnología que se ha desarrollado rápidamente destacando el sector de fabricantes de equipos de espesamiento y transporte. El principal objetivo de este trabajo fue evaluar la producción de suspensiones concentradas conocidas como pastas minerales de relaves provenientes de procesos de beneficio de manganeso obtenidas mediante un espesador de pasta en escala de laboratorio. El estudio incluye la caracterización de la muestra sólida, evaluación de floculantes (tipo y dosificación), uso de un equipo productor de pasta de escala de laboratorio con una capacidad útil de 7 litros para la formación de pasta mineral a través de alimentación contínua de pulpa, evaluación de influencia sobre la concentración de sólidos con el uso del generador de flóculos (RGF), características de las pastas minerales producidas como % de abatimiento o slump, ángulo de reposo o flume, perfil de concentración de sólidos en el espesador, viscosidad aparente y esfuerzo de fluencia. En relación a la composición química se obtuvo que los elementos predominantes son: Mn, Fe, Si y Al con una distribución granulométríca muy fina, representada por un d50 equivalente a 4,63μm. El floculante no iónico fue el que mostró mejor desempeño en sedimentación mientras que en los ensayos con recirculación de pulpa y adición de floculante, la mejor condición fue alcanzada para una recirculación de la zona más baja y máxima capa de compresión (4 para 1) obteniéndose un valor de 53,7% de sólidos en peso. En los ensayos contínuos con duración total de 180 minutos, el mayor valor del % de sólidos alcanzado con una alimentación de pulpa en flujo lineal fue de 52,7% para una dosis de 50 gpt de floculante. En los ensayos con alimentación curvilínea utilizando el RGF se obtuvo un valor de 55,5% de sólidos en peso; se verificó por medio del perfil de concentración de la zona de compresión que existe una etapa de transición de pulpa de alta densidad a pasta mineral en el rango de 40 a 45% de sólidos en peso. El relave de manganeso forma pasta mineral entre 47 y 56% de sólidos en peso. Fueron alcanzados ángulos de reposo en las pastas minerales superiores a los 8°. El comportamiento reológico de la totalidad de las pastas ensayadas presentó un carácter mixto: tixotrópico y reotrópico. El esfuerzo de cedencia alcanzó valores próximos a los 100Pa para 56% de sólidos en peso en la pasta mineral producida utilizando las mejores condiciones de operación encontradas en este estudio

COMPARISON OF VISCOELASTIC STRESS RELAXATION RESPONSE BETWEEN FLEXIBLE AND INFLEXIBLE INDIVIDUALS

The aim of this study was to compare the relaxation reaction after viscoelastic stress induced by passive static stretching during 30s between subjects with different flexibility performance. Eighteen male physical education students were randomly assigned to two groups according to flexibility level of knee extension. During the test the individuals should achieve 90% of maximal ROM and maintain the position for 30s while the stress relaxation was measured as relative decrease of torque. The results of this study show significant differences of range of motion (ROM) between the two groups, but no significant difference in stress relaxation. It can be concluded that viscoelastic stress relaxation is similar between subjects with significantly different flexibility performance after 30s passive static stretching

Endotoxemia por lipopolissacarídeo (LPS) de Escherichia coli, em equinos: efeitos de antiinflamatórios nas concentrações sérica e peritoneal do fator de necrose tumoral alfa (TNF-a)

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