The citral molecule has a double bond in its tail, which, when it comes into contact with acid, forms a circular structure.

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Once these polymers come into contact with water in or on the body, they self assemble into a new polymer structure that is designed to target bacteria membranes based on electrostatic interaction and break through their cell membranes and walls.

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Mr Fischer's departure is an embarrassment, since early blueprints of the new structure had him in a pivotal role as chief risk officer, and hence the senior contact with bank supervisors in Bonn.

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