O presente estudo teve como objetivo avaliar a influência dos níveis de magnésio sobre a altura, número de folhas e frutos e área foliar do feijoeiro (Phaseolus vulgaris L. cv Carioca), que constituem seus parâmetros biométricos. Empregou-se a solução nutritiva nº 2 de Hoagland & Arnon, modificada pela variação da concentração desse mineral, que estabeleceu a diferença entre os tratamentos. Em cada vaso, com capacidade para 6 litros, foram cultivadas 3 plantas. O experimento foi inteiramente casualizado, com 3 repetições, em esquema fatorial, com 5 níveis de magnésio e 5 colheitas, realizadas a intervalos de 14 dias. As plantas apresentaram aumento do número de folhas e da área foliar, na 3ª e 4ª colheitas, quando nutridas com 2,4 ppm de magnésio e aumento de altura e número de folhas, na 3ª colheita, naquelas submetidas a 24,3 ppm. Aumento do número de folhas, na 3ª colheita, foi observado em plantas nutridas com 72,9 ppm e na 3ª e 5ª colheitas naquelas submetidas a 97,2 ppm. Estes resultados sugerem que, nas condições do experimento, 2,4 ppm de Mg foram suficientes para manter o desenvolvimento adequado dos feijoeiros e que o nível ideal deste mineral para crescimento e desenvolvimento das plantas estaria entre 2,4 e 24,3 ppm.

The effect of magnesium levels in nutrient solution upon plant height, number of leaves and fruits, and leaf area of common bean was studied. Bean plants (3 per pot) were grown in 6 l pots containing Hoagland & Arnon n. 2 solution, modified for the magnesium concentration. The experimental design was a completely randomized factorial, replicated 3 times, with 5 magnesium levels, and 5 samplings which were done fortnightly. The number of leaves and the leaf area in the 3rd and 4th samplings were increased when the 2.4 ppm magnesium level was employed. Height and number of leaves in the 3rd sampling were increased when the plants were submitted to 24.3 ppm. On the other hand, an increased number of leaves was observed in the 3rd sampling when 72.9 ppm was used. When 97.2 ppm of magnesium was employed, there was an increase in the number of leaves at the 3rd and 5th samplings. Therefore, it can be suggested that, 2,4 ppm of magnesium is sufficient to maintain adequate development of the common bean. These results also suggest that, for the growth and development of the common bean the ideal level of magnesium is between 2.4 and 24.3 ppm.

Foram aplicados, o teste de Mantoux e uma prova intradérmica dupla de tuberculina (PID), em 131 pacientes hospitalizados para elucidação de diagnóstico, sendo os resultados comparados estatisticamente com o diagnóstico final obtido por métodos clínicos, cirúrgicos e laboratoriais. O teste de Mantoux lido às 72 h seguido de nova aplicação de PPD no mesmo local, sendo lida a nova reação após 24 h constitui a prova intradérmica dupla (PID), sendo o resaltado final obtido da diferença em mm entre a primeira e a segunda leitura. A análise estatística mostrou que a PID é melhor que o teste de Mantoux, com menos erros, menos reações falsas-positivas, probabilidade nula de dar falsos-negativos, maior sensibilidade e maior especificidade. Concluiu-se que a PID pode ser usada em elucidação de diagnóstico e em inquéritos de saúde pública em tuberculose.

The Mantoux test and a double intradermal tuberculin test (PID), were carried out on 131 patients hospitalized for diagnostic elucidation. Comparison was made between the results of the two intradermal tests and the final diagnosis, obtained by clinical, surgical and laboratory methods, and the data were submitted to statistical analysis. Measuring Mantoux reaction after 72 h, and injecting a new intradermal dose of PPD at exactly the same point and repeating the reading after another 24 h, the difference in size (mm) between the first and second readings may be interpreted in three different ways: 1) A difference of less than 3 mm between the two readings: nill statistical probability of patient with tuberculosis. 2) A difference of 3 mm or more, with maximal reaction diameter of 9 mm: indecisive result; patient probably without tuberculosis, however it is suggested that a new PID should be carried out after another 90 days. 3) A difference of 3 mm or more, with maximal reaction of 10 mm or more: patient probably has tuberculosis. The statistical analysis showed that the PID test is better than the Mantoux test, presenting fewer errors, less false-positive results, nill probability of false-negative results, better sensibility and specificity. The conclusion was drawn that the PID is a test that can be used in diagnostic elucidation and publici health surveys on the incidence of tuberculosis.

Foram aplicados, o teste de Mantoux e uma prova intradérmica dupla de tuberculina (PID), em 131 pacientes hospitalizados para elucidação de diagnóstico, sendo os resultados comparados estatisticamente com o diagnóstico final obtido por métodos clínicos, cirúrgicos e laboratoriais. O teste de Mantoux lido às 72 h seguido de nova aplicação de PPD no mesmo local, sendo lida a nova reação após 24 h constitui a prova intradérmica dupla (PID), sendo o resaltado final obtido da diferença em mm entre a primeira e a segunda leitura. A análise estatística mostrou que a PID é melhor que o teste de Mantoux, com menos erros, menos reações falsas-positivas, probabilidade nula de dar falsos-negativos, maior sensibilidade e maior especificidade. Concluiu-se que a PID pode ser usada em elucidação de diagnóstico e em inquéritos de saúde pública em tuberculose.

The Mantoux test and a double intradermal tuberculin test (PID), were carried out on 131 patients hospitalized for diagnostic elucidation. Comparison was made between the results of the two intradermal tests and the final diagnosis, obtained by clinical, surgical and laboratory methods, and the data were submitted to statistical analysis. Measuring Mantoux reaction after 72 h, and injecting a new intradermal dose of PPD at exactly the same point and repeating the reading after another 24 h, the difference in size (mm) between the first and second readings may be interpreted in three different ways: 1) A difference of less than 3 mm between the two readings: nill statistical probability of patient with tuberculosis. 2) A difference of 3 mm or more, with maximal reaction diameter of 9 mm: indecisive result; patient probably without tuberculosis, however it is suggested that a new PID should be carried out after another 90 days. 3) A difference of 3 mm or more, with maximal reaction of 10 mm or more: patient probably has tuberculosis. The statistical analysis showed that the PID test is better than the Mantoux test, presenting fewer errors, less false-positive results, nill probability of false-negative results, better sensibility and specificity. The conclusion was drawn that the PID is a test that can be used in diagnostic elucidation and publici health surveys on the incidence of tuberculosis.