One of the ways new technology uses to deliver drugs into the human body is to put the drug into a nano length ‘container’ called a nanotube. A common container used in the past is a tube of carbon atoms but a container can be made up of many different organic substances. A current cancer drug uses the fact that cancer cells have a lower Ph than normal cells. A cancer drug is put into a container that collapses at a lower Ph which then releases the drug at the site of the cancer cells.

(The Great Courses – Introduction to Nanotechnology: The New Science of the Small)