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==Science and medicine== * [[Paranoid personality disorder]], a mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others. * [[p-Phenylenediamine]], an aromatic amine * Persistent Pigment Darkening, a [[Sunscreen#Measurements of protection|measure of UVA protection of sunscreens]] * [[Pharmaceutical Product Development]], a global contract research organization (CRO) * [[Pheophorbidase]], an enzyme * [[Mantoux test|PPD test]], Purified Protein Derivative test or Mantoux test, a screening test for tuberculosis * [[Postpartum depression]], a mental disorder affecting parents within the first year of their child's birth * [[Pour point depressant]], a chemical added to crude oil to lower its "pour point" * ppd, [[Protopanaxadiol]], a molecule * [[Psychogenic polydipsia]], excessive water intake with a psychiatric or pharmaceutical cause * [[Postharvest physiological deterioration]], natural change of crop tissues which is undesirable for human or livestock use
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