| DNA computing is a form of computing which uses DNA and molecular biology, instead of the
traditional silicon-based computer technologies. A single gram of DNA about the size of half inch cube can hold as much information as a trillion
compact disks.
This field was initially developed by Leonard Adleman of the
University of Southern
California. In 1994, Adleman demonstrated a proof-of-concept use of DNA as form of computation which was used to solve the traveling salesman problem. In addition, Bernhard Yurke (Bell Labs) has developed DNA motors. Since the initial Adleman experiments advances have been made, and various Turing machines has been proved to be constructable.
There are works over one dimensional lengths, bidimensional tiles, and even three dimensional DNA graphs processing.
On April 28, 2004, Ehud Shapiro and researchers at the Weizmann Institute announced in the journal Nature that they had constructed a DNA computer from biomatter extracted from human feces. This was
coupled with an input and output module and is capable of diagnosing cancerous activity
within a cell, and then releasing an anti-cancer drug upon diagnosis.
DNA computing is fundamentally similar to parallel computing
-- we take advantage of the many different molecules of DNA to try many different possibilities at once. The number of possible
solutions to a problem grows very quickly with the size of the problem, exhibiting exponential growth. For very large problems, the amount of DNA required will be too large to be
practical. Thus, DNA computing does not provide any new capabilities from the standpoint of computational complexity theory, the study of
which computational problems are difficult.
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