| PTC | papillary thyroid carcinoma; percutaneous transhepatic cholangiography; phase transfer catalyst; phe... |
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| ROPE | respiratory-ordered phase encoding |
| RP | radial pulse; radiopharmaceutical; rapid processing [of film]; Raynaud phenomenon; reactive protein;... |
| RP-HPLC | reverse phase-high performance liquid chromatography |
| RPIPP | reverse phase ion-pair partition |
| postmitotic phase | The period of the cell cycle after cell division when there is synthesis of RNA and protein; it may last for a few hours in rapidly growing tissue or a lifetime in non-renewing cells such as nerve cells. Synonym: Gap1 phase, postmitotic phase. (05 Mar 2000) |
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| postreduction phase | The stage following that of reduction of the chromosomes in the sexual cells, representing the mature forms of these cells, ending with the conjugation of the nuclei in the impregnated ovum. Synonym: postreduction phase. (05 Mar 2000) |
| poststationary phase | The period in the growth of a bacterial culture in which growth is declining. (05 Mar 2000) |
| pregenital phase | In psychoanalysis, the collective psychosexual development phase's preceding the genital phase. (05 Mar 2000) |
| preimplantation phase | The time period between fertilization and implantation. (12 Dec 1998) |
| premeiotic phase | The stage of nuclear changes in the sexual cells before the reduction of the chromosomes, embracing the cell generations up to that of the spermatogonia and oogonia. Synonym: prereduction phase. (05 Mar 2000) |
| premitotic phase | The period in the cell cycle when synthesis of DNA is completed but before mitosis begins. Synonym: Gap2 phase, premitotic phase. (05 Mar 2000) |
| pre-oedipal phase | In psychoanalysis, the collective phase's of psychosexual development preceding the oedipal phase. (05 Mar 2000) |
| prereduction phase | The stage of nuclear changes in the sexual cells before the reduction of the chromosomes, embracing the cell generations up to that of the spermatogonia and oogonia. Synonym: prereduction phase. (05 Mar 2000) |
| horizontal growth phase | An early stage of development of cutaneous melanoma by intraepidermal spread of atypical melanocytes. (05 Mar 2000) |
| sleep phase delay syndrome | <syndrome> A disorder in which the circadian rhythm of sleep and waking falls into a delayed but stable relationship with external time cues of day and night. (05 Mar 2000) |
| soil phase | A subdivision of a soil series having features (for example, slope, surface texture, thickness and stoniness) that affect the use and management of the soil, but which do not vary sufficiently to differentiate it as a separate series. (09 Oct 1997) |
| solid phase immunoassay | Immunoassay in which the antigen or serum is bound to a solid surface, such as a microplate wall or the sides of a tube, the other reactants being free in solution. (05 Mar 2000) |
| S phase | <cell biology> The phase of the cell cycle during which DNA replication takes place. (18 Nov 1997) |
| stationary phase | The plateau of the growth curve after log growth in a culture, duringwhich cellnumber remains constant. New cells are produced at the same rate as oldercells die. (09 Oct 1997) |