EXO ELECTROGENIC SPECIES ARE FOUND IN MANY GENERA OF EUKARYOTIC AS WELL AS PROKARYOTIC ORGANISMS ;BUT BACTERIA ,PARTICULARLY CYANOBACTERIA AND PHOTOSYNTHETIC EUKAROTES LIKE ALGAE AREIN THE FOREFRONT - BOTH MICRO AMD MACRO ALGAE ARE BEING UTILISED WITH OR WITHOUT BACTERIA IN MFCs FOR TREARING POLLUTED WATER AND SIMULTANEOUS PRODUCTION OF ELECTRICITY -THE ADVANTAGE WITH ALGAE IS THEY SUCK IN CO2 AND GIVE OUT O2 AND ARE THUS BETTER FOR ENVIRONMENT NITZCHIA IS A LARGE GENUS OF DIATOMS WHICH INCLUDES BOTH FRESH WATER AND MARINE SPECIES -MANY TOXIC ALSO;BUT THEY ALSO SERVES AS GOOD BIOSENSORS MAINLY DUE TO THEIR BIOLUMINESCENT POROUS SILICON FRISTULE DIATOMS LIKE NITZSCIA ARE ALSO PREFERRED DUE TO THEIR OIL PRODUCTION AND OTHER USES OF THEIR FRISTULE