| http://www.w3.org/ns/prov#value | - h causes their colour to change as they are stretched.Prof Peter Vukusic, one of the Exeter researchers, said the fibres could one day be used in place of a kind of optical fibre known as a photonic crystal fibre (PCF) that traps light inside it due to its microstructure.???Whereas the traditional PCFs are made of glass, silica or other materials and you can???t generally stretch them, the bio-ins
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