currently accessible in the international civilian commercial market

a micrometer computer chip with nanometer transistors, 

doesn't need any memory or battery, 

when chip gets energy, 

chip executes function, 

when chip gets no more energy, 

chip stops executing function 

if inductive charging could be used to energize or interact with chips placed in biological tissue so that chips interact with biological cells, 

if not, 

then there are probably lots of alternatives, 

electricity, 

light, 

electro magnetic radiation, 

acoustic radiation, 

particle radiation, 

possibly even chemicals 

even if experiments only works in a petri dish, 

or in surface area of tissue, 

or easily accessible area of tissue, 

it's still a step forward 

many semiconductor factories offer to build custom chips, 

usually with bigger transistors to keep costs down, 

transistors could be modified to something else than transistors, 

into something that interacts more easily with biological cells, 

length wise 300 3nm transistors fit in one micrometer chip 

is transistor or circuit more applicable?