A molecular assembler as defined by
K. Eric Drexler is a "proposed device able to guide chemical reactions by positioning reactive molecules with atomic precision." He also introduced a related term, "
molecular manufacturing," which he defined as the programmed "chemical synthesis of complex structures by mechanically positioning reactive molecules, not by manipulating individual atoms." Some biological molecules such as
ribosomes fit this definition, since while working within a
cell's environment, it receives instructions from
messenger RNA and then assembles specific sequences of
amino acids to construct
protein molecules. However, the term "molecular assembler" usually refers to theoretical man-made or synthetic devices. They are thought to be highly desirable since they have been theorized to manufacture products with absolute precision and thus without any pollution. However, others have warned that such a powerful technology might escape human control and begin to compete with natural forms of
life on earth.
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