| IPD | idiopathic Parkinson disease; idiopathic protracted diarrhea; immediate pigment darkening; increase ... |
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| IPG | impedance plethysmography; inspiration-phase gas |
| LEP | lethal effective phase; lipoprotein electrophoresis; low egg passage; lower esophagus |
| LLP | late luteal phase; long-lasting potentiation |
| LPD | low-protein diet; luteal phase defect |
| pre-oedipal phase | In psychoanalysis, the collective phase's of psychosexual development preceding the oedipal phase. (05 Mar 2000) |
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| 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) |
| negative phase | The period during which the opsonic index is lowered following the injection of a vaccine. (05 Mar 2000) |
| death phase | <cell culture> The final growth phase in a culture, during which nutrients have been depleted and cell number decreases. (09 Oct 1997) |
| supernormal recovery phase | A brief period during the recovery of cardiac muscle following excitation when diseased muscle is more (i.e., less abnormally) excitable; corresponds to the end of the T wave in the ECG. (05 Mar 2000) |
| synaptic phase | <cell biology> The specific pairing of the chromatids of homologous chromosomes during prophase I of meiosis. It allows crossing over to take place. (18 Nov 1997) |
| discontinuous phase | The particles contained in a colloid solution. Synonym: discontinuous phase, dispersed phase. (05 Mar 2000) |
| dispersed phase | The particles contained in a colloid solution. Synonym: discontinuous phase, dispersed phase. (05 Mar 2000) |
| dispersion phase | The medium or fluid in which a disperse is suspended. Synonym: continuous phase, dispersion medium, dispersion phase, external medium. (05 Mar 2000) |