Life SciencesMarine SciencesMicrobiologyMarine MicrobiologyMicrobial EcologyMicrobial PhysiologyMarine Microbial PhysiologyMicrobial BiogeochemistryMicrobial OceanographyOpen Ocean MicrobiologyPhotosynthesis In MicroorganismsPhotosystem IiBacterial-phytoplankton InteractionsLight-harvesting PhysiologyNitrificationNitrifying BacteriaNitrite OxidationNitrite PathwayNitrite Reductase Activity