Then they dipped The material piece in silver nanoparticles and Chitosan – a kind of sugar from crabs and lobsters – which coated the fabric with an extra invisible layer.پاکستان موسمیاتی تبدیلی سے سب سے Ø²ÛŒØ§Ø¯Û Ù…ØªØ§Ø«Ø±Û�