1000 resultados para k-mère
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BACKGROUND: Creatinine clearance is the most common method used to assess glomerular filtration rate (GFR). In children, GFR can also be estimated without urine collection, using the formula GFR (mL/min x 1.73 m2) = K x height [cm]/Pcr [mumol/L]), where Pcr represents the plasma creatinine concentration. K is usually calculated using creatinine clearance (Ccr) as an index of GFR. The aim of the present study was to evaluate the reliability of the formula, using the standard UV/P inulin clearance to calculate K. METHODS: Clearance data obtained in 200 patients (1 month to 23 years) during the years 1988-1994 were used to calculate the factor K as a function of age. Forty-four additional patients were studied prospectively in conditions of either hydropenia or water diuresis in order to evaluate the possible variation of K as a function of urine flow rate. RESULTS: When GFR was estimated by the standard inulin clearance, the calculated values of K was 39 (infants less than 6 months), 44 (1-2 years) and 47 (2-12 years). The correlation between the values of GFR, as estimated by the formula, and the values measured by the standard clearance of inulin was highly significant; the scatter of individual values was however substantial. When K was calculated using Ccr, the formula overestimated Cin at all urine flow rates. When calculated from Ccr, K varied as a function of urine flow rate (K = 50 at urine flow rates of 3.5 and K = 64 at urine flow rates of 8.5 mL/min x 1.73 m2). When calculated from Cin, in the same conditions, K remained constant with a value of 50. CONCLUSIONS: The formula GFR = K x H/Pcr can be used to estimate GFR. The scatter of values precludes however the use of the formula to estimate GFR in pathophysiological studies. The formula should only be used when K is calculated from Cin, and the plasma creatinine concentration is measured in well defined conditions of hydration.
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Foi estudada a ocorrência de Diabrotica speciosa (Germar, 1824) (Coleoptera, Chrysomelidae) e de Agrotis ipsilon (Hüfnagel, 1767) (Lepidoptera, Noctuidae) em plantas de batata, cultivares Achat e Monalisa, influenciadas por dosagens de nitrogênio e potássio, e teor mínimo de açúcares solúveis. Os seguintes parâmetros foram avaliados: concentração de nutrientes minerais e açúcar em folha verde, folha senescente, folha em abcisão, haste, tubérculo e planta total usando extratos de infusão em etanol 80%. A maior infestação por larvas de D. speciosa foi na cultivar Monalisa a 150 kg.ha-1 de N + K com 27,03% a P<0,05. Foi observado que o efeito da dosagem de N + K no incremento da concentração de açúcares solúveis aumentou os danos provocados por A. ipsilon nos tubérculos e hastes. A infestação por essas espécies aumentou para 58,82% na cultivar Monalisa, quando a dosagem de nitrogênio foi elevada de 0 para 150 kg.ha-1, na ausência de potássio. Por outro lado, alta dosagem de potássio reduziu os danos causados por A. ipsilon na cultivar Monalisa. Entretanto, não influiu no armazenamento de açúcar solúvel. Os resultados indicaram que na cultivar Achat os teores de açúcares solúveis foram reduzidos, provavelmente sensibilizados pela elevação da dosagem de adubação potássica, diferindo da cultivar Monalisa cuja influência verificada foi pela dosagem do nitrogênio.
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This research aims to provide a contribution towards understanding how and why certain people can display disobedience behaviors, to overcome unjust situations, and withstand persecutions deployed by authority. The paper presents a hermeneutic content analysis of the autobiographical speeches and texts of Gandhi, M. L. King and Mandela. Our results show that parents' value orientation, experience of injustice during childhood and exploration of alternative viewpoints during adolescence play a crucial role in structuring prosocial disobedience. Findings show also that social responsibility and ingroup communication are important conditions for facing persecutions without dropping original goals.