| 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 |
| late luteal phase dysphoric disorder | <syndrome> A combination of emotional, physical, psychological, and mood disturbances that occur after ovulation and normally end with the onset of the menstrual flow. (12 Dec 1998) |
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| latency phase | In psychoanalytic personality theory, the period of psychosexual development in children, extending from about age 5 to the beginning of adolescence at age 12, during which the apparent cessation of sexual preoccupation during this period stems from a strong, aggressive blockade of libidinal and sexual impulses in an effort to avoid oedipal relationships; during this phase, boys and girls are inclined to choose friends and join groups of their own sex. Synonym: latency period. (05 Mar 2000) |
| late-phase response | Recurrence of symptoms after an appreciable interval following challenge with an antigen; preceded by an initial early-phase response. (05 Mar 2000) |
| leukaemia, accelerated phase of | Refers to chronic myelogenous leukaemia that is progressing. The number of immature, abnormal white blood cells in the bone marrow and blood is higher than in the chronic phase, but not as high as in the blast phase. (12 Dec 1998) |
| logarithmic phase | <cell culture> The steepest slope of the growth curve of a culture--the phase of vigorous growth during which cell number doubles every 20-30 minutes. (15 Nov 1997) |
| L-phase variants | Bacterial variant's which do not have rigid cell walls but which may contain varying amounts of cell wall material; they are spherical to coccobacillary in shape and vary in size from small bodies that pass through filters which retain bacteria to bodies that are larger than the bacterial form; they are Gram-negative and resistant to penicillin; some revert to the bacterial phase upon removal of the inducing substance, whereas others do not; the variant's differ greatly from the parent bacterial cells in mode of reproduction, physiology, growth requirements, and individual and colonial morphology; they are generally considered to be nonpathogenic, even if derived from a pathogenic bacterium. Origin: L. Fr. Lister Institute (05 Mar 2000) |
| luteal phase | The post-ovulatory phase of a woman's cycle, the corpus luteum produces progesterone, which in turn causes the uterine lining to secrete substances to support the implantation and growth of the early embryo. (09 Oct 1997) |
| luteal phase defect | Inadequate function of the corpus luteum that may prevent a fertilized egg from implanting in the uterus or may lead to early pregnancy loss. (09 Oct 1997) |
| luteal phase deficiency | Inadequate function of the corpus luteum that may prevent a fertilized egg from implanting in the uterus or may lead to early pregnancy loss. (09 Oct 1997) |
| lytic phase | A phase of the virus life cycleduring which the virus replicates within the host cell, releasing a new generation of viruses when the infectedcell lyses. (09 Oct 1997) |
| accretionary growth | Growth by an increase of intercellular material. (05 Mar 2000) |
| appositional growth | Growth accomplished by the addition of new layers on those previously formed; e.g., the addition of lamellae in the formation of bone; it is the characteristic method of growth when rigid materials are involved. (05 Mar 2000) |
| auxetic growth | Growth by increase in the size of component cells. Synonym: intussusceptive growth. (05 Mar 2000) |
| bacterial growth | Growth of a bacterial culture either by increase in cell material or cell number. (05 Mar 2000) |
| B-cell differentiation/growth factors | Various substances, usually obtained from the supernatant of T-cell cultures, such as interleukin 4, 5, and 6. These substances are necessary for B-cell growth, maturation, and differentiation into plasma cells or B memory cells. (05 Mar 2000) |