DETERMINING biological oxygen demand (BOD), an important pollution indicator, from urban sewage wastes will now be easier and faster. Scientists at the Indian Institute of Chemical Technology in

If paper and power prices included ecological costs, the consumer would have to pay at least 60 per cent more for them than he pays today

A NEW cryogenic system for industrial cleaning, using "dry ice" or solidified carbon dioxide, has been developed by Distillers MG, which is part of the German Messer Griesheim industrial gas group.