The presence of transitory viremia without seroconversion indicates that the vertical transmission of HCV is not important. This could be related to the viral charge and ingestion of milk of HCV-RNA-positive mothers. However, to advise avoidance of maternal breast feeding, it would be necessary to conduct larger studies.

This paper studies the control of a pH neutralization process by using a fuzzy controller. As the process to be controlled is highly non-linear the PI-type fuzzy controller that will be used generally is not able to control the system adequately. For this, based on prior knowledge, the pH neutralization process is divided into fuzzy regions such as high-gain, medium-gain and low-gain, and an auxiliary variable is used to detect the p e s s opaation region. Then the fuzzy logic controller designed using this auxiliary variable as input, can give satisfactory performance in all regions. This conunller has been tested in real-time on a bench plant. On-line results show that the designed control system allows the plant to operate in a range of pH values, despite perturbations and variations of the plant parameters, obtaining good performance at the desired worldngs points.

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