Canada Goose online The frequency of pathogens isolated from ear infections studied in the paper, from 1995 to 2016, as a percent of total ear infections. Spn is S pneumonia; Hflu is H influenzae; and Mcat is M catarrhalis. Image via Kaur, et al., Pediatrics, 2017. New hope in battle against plastic rubbish as scientists make accidental discoveryPenicillin is probably the most important accidental discovery but could scientists at the University of Portsmouth have found a similar gamechanger for rubbish?(Image: Getty Images)Get daily news updates directly to your inboxSubscribeSee our privacy noticeMore newslettersThank you for subscribingWe have more newslettersShow meSee our privacy noticeCould not subscribe, try again laterInvalid EmailSolving the problem of plastic waste has flown up the agenda since Sir David Attenborough’s documentary showed it killing the world’s oceans.There are calls for plastic free aisles in supermarkets, a plastic bottle deposit scheme has become a hot topic and reusable coffee cups got handed out to ministers attending Cabinet.And now an accidental discovery could be a big help in reducing our mountains of plastic rubbish.British researchers hope an engineered enzyme could be key but only discovered it while investigating its natural counterpart.Tests showed the lab made mutant had a supercharged ability to break down polyethylene terephthalate (PET), one of the most popular forms of plastic used in the food and drinks industry.Bottles made from PET are used to package 70% of soft drinks, fruit juices and mineral waters sold in shops and supermarkets, according to the British Plastics Federation.Although it is said to be highly recyclable, discarded PET persists for hundreds of years in the environment before it degrades.Where the idea came from(Image: PA)The new research sprang from the discovery of bacteria in a Japanese waste recycling centre that had evolved the ability to feed on plastic.The bugs used a natural enzyme called PETase to digest PET bottles and containers.While probing the molecular structure of PETase, the UK team inadvertently created a powerful new version of the protein.Working with US colleagues, University of Portsmouth scientists subjected PETase to intense X ray beams at the Diamond Light Source synchrotron facility in Harwell, Oxfordshire.X rays 10 billion times brighter than the sun are generated at the facility by accelerating electrons around a circular tunnel. The X rays can be used to reveal the fine structure of materials and biomolecules, down to the level of individual atoms.Using the PETase blueprint provided by the Diamond Light Sources, the scientists re engineered an active region of the molecule. The result was a mutant protein with an enhanced ability to attack plastic.In addition to digesting PET, the new enzyme was also capable of degrading polyethylene furandicarboxylate (PEF), a bio based form of plastic being hailed as a replacement for glass beer bottles.A happy accident Lead scientist Professor John McGeehan, from the University of Portsmouth, said: “Serendipity often plays a significant role in fundamental scientific research, and about his our discovery here is no exception.”Although the improvement is modest, this unanticipated discovery suggests that there is room to further improve these enzymes, moving us closer to a recycling solution for the ever growing mountain of discarded plastics.”The technology exists and it’s well within the possibility that in the coming years we will see an industrially viable process to turn PET and potentially other (plastic) substrates like PEF, PLA and PBS back to their original building blocks, so that they can be sustainably recycled.”The findings are reported in the journal Proceedings of the National Academy of s.Prof McGeehan, director of the Institute of Biological and Biomedical s in the School of Biological s at Portsmouth, said: “Few could have predicted that since plastics became popular in the 1960s huge plastic waste patches would be found floating in oceans, or washed up on once pristine beaches all over the world.. Canada Goose online
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