There are multiple definitions:

1. proton exchange membrane(English)

   • fuel cell that operates at relatively low temperatures and is composed of two electrodes and a conductive elecrolyte
   • MFC
   • Engineering aspects
   • https://doi.org…1039/C9SE00381A

2. paired-end mapping(English)

   • a large scale genome-sequencing method to identify SV’s
   • GWAS, SV
   • Genomics

3. protein energy malnutrition(English)

   • form of malnutrition that is defined as a range of conditions arising from coincident lack of dietary protein and/or energy (calories) in varying proportions
   • Nutrition, Proteins / proteomics, Environment
   • https://doi.org…pcl.2009.07.001

4. post-exertional malaise(English)

   • the worsening of symptoms following even minor physical or mental exertion that would have been tolerated previously. Symptoms typically worsen 12 to 48 hours after activity. PEM can last for days or even weeks. PEM can be mitigated by activity management (pacing)
   • CFS, COVID-19, CPET, CVS, FMD, HRV, ME, OI, PCS, PORH, POSH, POTS, SBP, SV
   • Exercise & Training, Chronic fatigue syndrome, Fatigue, Therapeutic approaches
   • https://doi.org…med.2021.642710
   • https://doi.org…acc.2021.06.045
   • https://doi.org…rev.2020.102527

5. prescription-event monitoring(English)

   • MedDRA/J, LLT
   • Monitoring, Pharmacology / pharmaceutics

6. polymer electrolyte membrane(English)

   • may refer to a fuel cell
   • DMFC, MEA, OCV
   • Membranes
   • https://doi.org…science.1090920

7. pulmonary endometriosis(English)

   • is rare, and drug therapy remains the primary treatment. However, these patients frequently experience recurrent hemoptysis that is refractory to pharmacological intervention
   • PDT
   • Respiratory system, Pathology, Therapeutic approaches
   • https://doi.org…000605231204485