Bacteria are the basic life forms on our planet; they represent the most ancient type of living organisms; our life started from them. Bacteria evolve faster than other life forms. They live in symbiotic relationships with plants and animals and participate in the process of life.
However, bacteria are not always friendly and good as they are the reason for most diseases. A human being always tries to avoid the harmful effect of bacteria. At the beginning of the twentieth century antibiotics and antibacterial agents were invented, which seemed to solve the problem. But over time the bacteria have adapted to those substances. Nowadays antibiotics are ineffective and cause more harm than good. Other substances are needed to fight bacteria in a different way.  NANOTECHNOLOGIES .. with in nano silver and nano copper  successfully face this task. Research laboratories around the world show that bacteria are unable to produce protective mechanisms against silver and copper nanoparticles.