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| Particle Particle Size Parts Per Million (Ppm) Pathogen Peat Pectine Peptide Permeability Pesticides Pext Ph Phagocyte Polymer Prebiotic Probiotic Protein (Protid) Protein-Prion |
| Amino-acid chain linked by peptidic connections and put in perfectly defined sequences. Their molecular mass is from 10 000 to 1 000 000 grams per molecule. Protein decomposition (proteolyse) is a depolymerization which gives polypeptides than peptides and finally amino-acids. |