Nature Communicatio

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Nature Communications 101038/s41467-017-01248-2 2017 This new invisible ink can be switched on and off on demand By Giorgia GuglielmiOct 31 2017 12:00 PM The next James Bond might have a hard time decoding top secret documents Researchers have developed a lead-based invisible ink that unlike its predecessors is colorless under ultraviolet (UV) light until a salt is added to make it glow What’s more the ink can be switched off on demand using another chemical trigger: Add methanol and it vanishes within 10 minutes The researchers have used the ink to print on parchment paper both text and more complex patterns such as QR codes and butterflies (pictured as they appear under a UV lamp after adding the salt) After being switched on and off 20 times the ink didn’t lose its bright color under UV light and could be kept in open air for 3 months without degrading the team reports today in Nature Communications Because lead-based materials can be toxic the researchers hope to design lead-free alternatives that could make the new ink a go-to tool for security and privacy protectionThiruvananthapuram/Kozhikode: The Kerala government on Fridaystepped up vigil against the Nipah virus that has claimed 16 lives in Kozhikode and Malappuram districts even as staffers of a taluk hospital at Balussery have been asked to go on leave as a precautionary measure All meetings scheduled to be held in the two districts this month have been postponed until further notice an official said People have been asked to be extremely alert Even though there have been no positive cases on Friday six persons got admitted to the Kozhikode medical college with symptoms of the virus an official said Of the 203 samples tested for Nipah there have been 18 positive cases of whom 16 persons have lost their lives A well is being covered to contain the deadly Nipah virus Image courtesy Rejimon K There is one unconfirmed death and 17 suspected nipah casesare under observation according to the official The Public Service Commission has postponed all its written and online exams scheduled to be held till 16 June? an al-Qaeda linked group, deregulation and of course Supreme Court justices who will take the court decisively rightward.

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