Scientists Turn Escherichia coli Bacteria into Mercury Sensor

• Researchers from Imperial College London and Zhejiang University have developed a self-powered chemical sensor using genetically engineered bacteria.

• The sensor interfaces directly with electronics, enabling the creation of cheap and programmable bioelectronic devices.

• Traditional biosensors, based on enzymes, are fragile, costly, and slow in complex environments.

• The researchers developed a modular biosensor that senses the presence of specific compounds and converts that into an electrical signal compatible with low-cost electronics.

• The biosensors were built using genetically engineered Escherichia coli bacteria as ‘containers’.

• The sensors detected two types of compounds: arabinose and mercury ions in water.

• The researchers added a genetic amplifier to the E. coli, triggering the production of a polymerase that triggered the phenazine production pathway.

• The team demonstrated an ‘AND’ logic gate inside the E. coli, producing a signal only when two specific molecules were present together.

Escherichia coli Environmental Sensor is important topic for Civil service exam (WBCS).

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