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Our results expand the range of P. tricornutum auxotrophic strains and demonstrate that auxotrophic complementation markers provide a viable alternative to traditionally used antibiotic selection markers. Plasmid-based auxotrophic markers should expand the range of genome engineering applications and provide a means for biocontainment of engineered P. tricornutum strains.An electrochemical immunoassay for the ultrasensitive detection of Newcastle disease virus (NDV) was developed using graphene and chitosan-conjugated Cu(I)/Cu(II) (Cu(I