Traditionally, some textbooks from the United States used a system of six kingdoms (Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria, and Bacteria/Eubacteria) while textbooks in Great Britain, India, Australia, Latin America and other countries used five kingdoms (Animalia, Plantae, Fungi, Protista and Monera).
For other uses, see Placebo (disambiguation) and Placebo effect (disambiguation). The placebo effect can be produced by inert tablets, by sham surgery, and by false information, such as when electrical stimulation is turned off in those with Parkinson's disease implanted brain electrodes.
Both the placebo and the active drug are given, but the subjects are unaware which is which. This is done for the purpose of eliminating effects due to purely psychological causes. 2. A harmless preparation prescribed to satisfy a patient who does not require active medication. From the Latin placere, to please. See also PLACEBO EFFECT. placebo