The red seaweed Delisea pulchra effectively avoids a broad spectrum of bacterial infections without breeding any bacterial resistance to its defensive chemistry. Molecules known as furanones produced by the seaweed bind readily to the specific protein-covered bacterial receptor sites that receive the bacterial signaling molecules (N-acyl homoserine lactone) that normally induce surface colonization. This method of blocking bacterial communication effectively prevents bacteria from forming groups and becoming virulent, but does not physically kill them. Over 80% of bacterial infections in humans are estimated to involve the formation of bacterial colonies, or biofilms, while numerous other potential applications for this completely novel anti-bacterial technology exist. BioSignal Ltd. is now testing and/or already applying synthetic furanones based on those produced by Delisea pulchra in a variety of applications, including medical treatment and devices; pipelines; heating, ventilating, and air conditioning systems; cleaning products; and water treatment.