a simple and rapid method has been developed for the determination of ascorbic acid in fruit and pharmaceutical products. the method is based on the measurement of the reaction rate between ammonium molybdate and ascorbic acid in acidic media. the reaction was monitored spectrophotometrically at 800 nm by fixed-time and variable-time methods. the calibration graph was linear in the range of 5 0...

A simple and rapid method has been developed for the determination of ascorbic acid in fruit and pharmaceutical products. The method is based on the measurement of the reaction rate between ammonium molybdate and ascorbic acid in acidic media. The reaction was monitored spectrophotometrically at 800 nm by fixed-time and variable-time methods. The calibration graph was linear in the range of...

To observe the aggregation and dispersal behavior of adult European corn borer, Ostrinia nubilalis (Hu ̈ bner), males in search of mates, two populations were marked, each with a different dye. One population was continuously reared in the laboratory (.5 yr) and the other was collected annually from the Þeld. From 1986 to 1988, marked adults were released in two release sets per year, with three...

1 Departamento de Medicina Social, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo. Av. Bandeirantes 3900/2°, Monte Alegre. 14049-900 Ribeirao Preto SP. [email protected] 2 Institute for Population and Social Research, Mahidol University, Thailand. 3 Faculdades Integradas do Brasil, UniBrasil. 4 Departamento Materno-Infantil, Escola de Enfermagem de Ribeirão Preto, Universi...