ABSTRACT Photosynthesis (PS) in purple non-Sulfur bacteria (PNSB) is strictly controlled to avoid energy consumption and to prevent oxidative stress when oxygen is present. PpsR. a transcriptional repressor encoded in the photosynthesis gene cluster (PGC). is one of the main players in the regulation of PS-related genes. https://www.diegojavierfares.com/best-price-Vinyl-Wall-Decal-Sticker-Gymnastic-Rings-815-quick-super/