| in vacuo | <physics> In a vacuum; in empty space; as, experiments in vacuo. Origin: L. Source: Websters Dictionary (01 Mar 1998) |
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| in vitro | Within a glass, observable in a test tube, in an artificial environment. (28 Oct 1998) |
| in vitro fertilization | <gynaecology> Fertilization outside the body in a laboratory, the term test tube baby is inaccurate since fertilization occurs in a small circular dish, not a test tube. (27 Oct 1998) |
| in vivo | Within the living body. (18 Nov 1997) |
| in vivo fertilization | Fertilization of a ripe egg within the distal fallopian tube of a fertile donor female (rather than in an artificial medium), for subsequent nonsurgical transfer to an infertile recipient. (05 Mar 2000) |
| inaction | Inactivity, rest, or lack of response to a stimulus. (05 Mar 2000) |
| inactivate | To destroy the biological activity or the effects of an agent or substance, as the activity of complement is destroyed when serum is heated. (05 Mar 2000) |
| inactivated polio vaccine | <pharmacology, virology> An inactivated vaccination, administered by injection to children for protection against the polio virus. Typically given at 2, 4 and 15 months. A final vaccine is recommended at 4-6 years. (27 Sep 1997) |
| inactivated poliovirus vaccine | Inactivated poliovirus vaccine (IPV), an aqueous suspension of inactivated strains of poliomyelitis virus (types 1, 2, and 3) used by injection; has largely been replaced by the oral vaccine. See: Salk vaccine. (05 Mar 2000) |
| inactivated serum | <immunology> Serum that has been heated 50캜 for 30 minutes to destroy the lytic activity of complement. (05 Mar 2000) |
| inactivation | <neurology, physiology> For example of voltage gated sodium channels: process by which sodium channels that have been activated or opened by depolarisation subsequently close during the depolarisation. Distinguished from activation by its slower kinetics. (18 Nov 1997) |
| inactive | Not active. (18 Nov 1997) |
| inactive mutant | A mutant that is not phenotypically manifest. Synonym: silent mutant. (05 Mar 2000) |
| inactive repressor | A repressor that cannot combine with an operator gene until it has combined with a corepressor (usually a product of a protein pathway); after activation, the repressor arrests production of the proteins controlled by the operator gene; a homeostatic mechanism for regulation of repressible enzyme systems. Synonym: aporepressor. (05 Mar 2000) |
| inactive tuberculosis | A scar or a calcified, fibrous, or caseous nodule in the lung pleura, lymph node, or other organ, resulting from previous tuberculosis that has regressed; reactivation is possible. Synonym: arrested tuberculosis, inactive tuberculosis. (05 Mar 2000) |