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.ealisboa.com/quick-save-Pentair-Female-to-Female-Hose-Adapter-4-For-Sectional-Hose-K21241B-top-mega/