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A prospective study enrolling 50 mother-infant pairs was undertaken to determine the effect of maternal antibodies on poliovirus antibody titres and seroconversion rates in infants and to determine the difference in titres and seroconversion rates following three and five doses of oral poliovaccine (OPV). Cord blood samples and samples collected 4 weeks after 3rd and 5th doses of trivalent oral poliovaccine were processed for estimation of anti-poliovirus antibody titres. These were expressed as geometric mean titres (GMT). Significance was analyzed using unpaired 't' test. The relationship between maternal antibody titres and seroconversion was determined by correlation coefficient test. Post OPV5 titres were significantly higher than post OPV3 titres for type 1 and type 2 polioviruses. Seroconversion rates against type 1, 2 and 3 polioviruses were 92.9%, 100.0% and 92.9% following OPV3 and 100.0%, 100.0% and 93.2% following OPV5. The cord blood titres did not have any relation to post-OPV3 or post-OPV5 titres. Although there is significant passive transfer of poliovirus antibodies across the placenta, this does not affect titres achieved after immunization. Post-OPV5 titres against type 1 and type 2 viruses are significantly higher than post-OPV3 titres. The seroconversion rates following OPV5 are higher than those obtained post-OPV3 but this difference is not statistically significant.

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Thermal Power plants emit fly ash as well as other gases like Carbon dioxide (CO2), Carbon Monoxide (CO), Nitric Oxides (NOx) , Sulpher oxides (SOx ) ,etc. to the atmosphere and in turn, the atmosphere gets polluted. The pollution to this effect is dangerous to our living society as well as to the plant life. The reason is the use of fossil fuel like coal to run the thermal power plants. Air pollution control equipment for today's need are Electrostatic Precipitator (ESP), Fabric Filter (FF) etc. are in greater use. But, Electrostatic Precipitators (ESP) are widely used all over the world for better performance and better dust collection efficiency. It is a reliable and proven technology which can effectively handle large quantities of abrasive type fly ash without any operating problems. Energy saving aspect on this controlling measure is really challenging. For enhancement of ESP performance, promotion of new technology and development of electronics & materials are in continuous process of improvement. This paper presents the basic technological and operational concept of ESP and performance enhancement programs/activities being taken in Thermal power generation plants, which are in accordance with the Environmental Regulations of today's world. Keytwords: Low Tension Main Switch Board (LTMSB), microcontroller based ARECA, high voltage rectifier transformer, electrostatic precipitator.I.