| MPD | main pancreatic duct; maximum permissible dose; mean population doubling; membrane potential differe... |
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| PDL | pancreatic duct ligation; periodontal ligament; poorly differentiated lymphocyte; population doublin... |
| PDT | photodynamic therapy; population doubling time |
| Pop | popliteal; population |
| POPLINE | Population Information Online |
| synchronous cell population | <cell culture> A culture of cells that all divide in synchrony. Particularly useful for certain studies of the cell cycle, cells can be made synchronous by depriving them of essential molecules, which are then restored. Synchronisation breaks down after a few cycles, however, as individual cells have unique division rates. (19 Jan 1998) |
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| q in population genetics | The frequency of the less common of two different alternative (allelic) versions of a gene. (the frequency of the more common allele is p). (12 Dec 1998) |
| topotypical population | <zoology> Population occurring at the type locality from which the type specimen was taken. (09 Jan 1998) |
| urban population | The inhabitants of a city or town, including metropolitan areas and suburban areas. (12 Dec 1998) |