Nanomaterial with 'light switch' kills Gram-negative or Gram-positive bacteria

Health care-associated infections are a common problem in suppurating wound care, as is the rise in multi-drug resistant bacteria. In order to effectively and selectively combat bacterial infections, a team of researchers has developed a bactericidal nanomaterial equipped with a photochemical "light switch" that can be directed either against Gram-positive or Gram-negative bacteria.