OPG osteoprotegerin
ORZS Optimization of Root Zone Substrates
OSLDs optically stimulated luminescence dosimeters
Otolith Otolith Assessment During Postflight Re-adaptation
OUM oxygen uptake measurement
(^)
PACE Preliminary Advanced Colloids Experiment
PADIAC Pathway Different Activators
PADLES Passive Dosimeter for Life Science Experiments in Space
PAM Photoacoustic Analyzer Module
PAMELA Payload for Matter/antimatter Exploration and Light-nuclei Astrophysics
Parodont Study of the Condition of Periodontal Tissues in Space Flight
Particle Flux Particle Flux Demonstrator
PAS particle accumulation structure
Passages Scaling Body-related Actions in the Absence of Gravity
Pb lead
PBMCs Peripheral Blood Mononuclear Cells
PBU plunger box unit
PCAM Protein Crystallization Apparatus for Microgravity
PCDF Protein Crystallization Diagnostics Facility
PCG-EGN Protein Crystal Growth-Enhanced Gaseous Nitrogen
PCG-STES Protein Crystal Growth-Single Locker Thermal Enclosure System
PCR polymerase chain reaction
PCG Protein Crystal Growth
PCS Physics of Colloids in Space
PCSat Prototype Communications Satellite
PCU plasma conductor unit
PDB phorbol 12,13-dibutyrate
PDC protein depletion zone
PDGF Platelet-Derived Growth Factor
PEACE Polymer Erosion and Contamination Experiment PEC
PEG polyethylene glycol
PESTO Photosynthesis Experiment and System Testing and Operation
PEU plant experimental unit
PFE periodic fitness evaluation
PFM Pulmonary Function Module
PFMI Pore Formation in Microgravity
PFP perfluoro propane
PFS Pulmonary Function System
PGBA Plant Generic Bioprocessing Apparatus