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The team also created a "NOT gate" and combined it with the AND gate to produce
the more complex "NAND gate." NAND gates are significant because any Boolean
function (AND, OR, NOT, XOR, XNOR), which play a basic role in the design of
computer chips, can be implemented by using a combination of NAND gates.
The researchers will now try and develop more complex circuitry that comprises
multiple logic gates. To accomplish this they will need to find a way to link multiple
biological logic gates together that is similar to the way in which electronic logic gates
are linked together to enable complex processing to be carried out.
"We believe that the next stage of our research could lead to a totally new type of
circuitry for processing information," said Professor Martin Buck from the Department
of Life Sciences at Imperial College London. "In the future, we may see complex
biological circuitry processing information using chemicals, much in the same way
that our body uses them to process and store information."
The team also suggests that these biological logic gates could one day form the
building blocks of microscopic biological devices, such as sensors that swim inside
arteries, detecting the build up of harmful plaque and rapidly delivering medications
to the affected area. Other sensors could detect and destroy cancer cells inside the
body, while others could be deployed in the environment to monitor pollution and
detect and neutralize dangerous toxins.
BIBLIOGRAPHY
 www.electronicstutorials.com
 www.wikipedia.com
 https://www.newatlas.com/biological-logic-gates/20237/
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