Anti-Bacterial Agents 1 Antibacterial activity 1 Bacillus subtilis 1 Bacterial Physiological Phenomena 1 Cell Survival 1 Enterococcus faecalis 1 Lichens 1 Metal Nanoparticles 1 Parmotrema praesorediosum 1 Parmotrema praesorediosum extract 1 Particle Size 1 Plant Extracts 1 Proteus vulgaris 1 Pseudomonas aeruginosa 1 Salmonella typhi 1 Serratia marcescens 1 Silver 1 Silver nanoparticles 1 Staphylococcus epidermidis 1 X ray diffraction 1 antibacterial activity 1 article 1 controlled study 1 electron microscopy 1 gentamicin 1 green chemistry 1 lichen (organism) 1 lichens methicillin resistant Staphylococcus aureus 1 nonhuman 1