New Delhi: The Delhi Government observed the fourth car free day in the capital on Friday, to counter increased air pollution in the city.This was another step in the car-free initiative which was observed first on 22nd October.
The car-free day was observed from the Vishwavidyalaya’s Gate No 3 to Chhatrasal Stadium red light, a 6 km stretch in north Delhi.
Delhi Transport Minister Gopla Rai said “Next car free day will be organised in south Delhi. We are taking every initiative to bring down the air pollution level in the city through such initiatives.”
Deputy Chief Minister Manish Sisodia led a cycle rally along with the teachers and students of the Delhi University.(IANS)
Scientists in Britain and the United States say they have engineered a plastic-eating enzyme that could help in the fight against pollution.
The enzyme is able to digest polyethylene terephthalate, or PET — a form of plastic patented in the 1940s and now used in millions of tons of plastic bottles. PET plastics can persist for hundreds of years in the environment and currently pollute large areas of land and sea worldwide.
Researchers from Britain’s University of Portsmouth and the U.S. Department of Energy’s National Renewable Energy Laboratory made the discovery while examining the structure of a natural enzyme thought to have evolved in a waste-recycling center in Japan.
Finding that this enzyme was helping a bacteria to break down, or digest, PET plastic, the researchers decided to “tweak” its structure by adding some amino acids, said John McGeehan, a professor at Portsmouth who co-led the work.
This led to a serendipitous change in the enzyme’s actions — allowing its plastic-eating abilities to work faster.
“We’ve made an improved version of the enzyme better than the natural one already,” McGeehan told Reuters in an interview.
“That’s really exciting because that means that there’s potential to optimize the enzyme even further.”
The team, whose finding was published Monday in the Proceedings of the National Academy of Sciences journal, is now working on improving the enzyme further to see if it could be capable of breaking down PET plastics on an industrial scale.
“It’s well within the possibility that in the coming years we will see an industrially viable process to turn PET, and potentially other [plastics], back into their original building blocks so that they can be sustainably recycled,” McGeehan said.
Independent scientists not directly involved with the research said it was exciting, but cautioned that the enzyme’s development as a potential solution for pollution was still at an early stage.
“Enzymes are non-toxic, biodegradable and can be produced in large amounts by microorganisms,” said Oliver Jones, a Melbourne University chemistry expert. “There is strong potential to use enzyme technology to help with society’s growing waste problem by breaking down some of the most commonly used plastics.”
Douglas Kell, a professor of bioanalytical science at Manchester University, said further rounds of work “should be expected to improve the enzyme yet further.”
Supervised by young engineers, workers at the start-up company Chakr Innovation in New Delhi cut and weld sheets of metal to make devices that will capture black plumes of smoke from diesel generators and convert it into ink.