TL;DR: The Use of brown alga (Bifurcaria bifurcata) in the biosynthesis of copper oxide nanoparticles of Proportions 5–45 nm is reported for the first time and these nanoparticles have been located to show high antibacterial action in opposition to two distinct strains of microorganisms. permission is necessary to reuse all https://www.directivepublications.org/journal-of-applied-nanoscience/