| IF | idiopathic fibroplasia; idiopathic flushing; immersion foot; immunofluorescence; indirect fluorescen... |
|---|---|
| IP | icterus praecox; imaging plate; immune precipitate; immunoblastic plasma; immunoperoxidase technique... |
| IRC | inspiratory reserve capacity; instantaneous resonance curve; International Red Cross; International ... |
| INAA | instrumental neutron activation analysis |
| NAA | N-acetyl aspartate; naphthaleneacetic acid; neutral amino acid; neutron activation analysis; neutrop... |
| IHR | Instantaneous Heart Rate |
|---|---|
| I-V | Instantaneous current-voltage |
| ILV | instantaneous lung volume |
| BNCT | Boron Neutron Capture Therapy |
| IVNAA | In vivo neutron activation analysis |
| instantaneous | 1. Done or occurring in an instant, or without any perceptible duration of time; as, the passage of electricity appears to be instantaneous. "His reason saw With instantaneous view, the truth of things." (Thomson) 2. at or during a given instant; as, instantaneous acceleration, velocity, etc. <physics> Instantaneous center of rotation, in a body which has motions both of translation and rotation, is a line, which is supposed to be rigidly united with the body, and which for the instant is at rest. The motion of the body is for the instant simply that of rotation about the instantaneous axis. Instanta"neously, Instanta"neousness. Origin: Cf. F. Instantane. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| instantaneous electrical axis | The resultant axis of the electromotive forces developing in the heart at any given moment. (05 Mar 2000) |
| instantaneous rate | <epidemiology> In a short time interval (e.g a week), the number of events (e.g. Births in the UK) taking place during the interval is approximately proportional to the length of the interval. The constant of proportionality is the rate at which these events occur. This argument becomes more and more exact as the length of the time interval becomes shorter and shorter. When the time interval has shrunk to an instant, the rate has become an `instantaneous rate'. A bad term; just call it a rate. (05 Dec 1998) |
| instantaneous vector | The resultant vector of the heart's action currents at any given moment, usually represented as an arrow of appropriate direction and magnitude. (05 Mar 2000) |
| boron neutron capture therapy | A technique for the treatment of neoplasms, especially gliomas and melanomas in which boron-10, an isotope, is introduced into the target cells followed by irradiation with thermal neutrons. (12 Dec 1998) |
| neutron | <physics> An elementary atomic particle that has no charge and a mass that is approximately the same as that of a proton. Neutrons are found in allatoms except the lightest isotopes of hydrogen. (09 Jan 1998) |
| neutron activation analysis | Activation analysis in which the specimen is bombarded with neutrons. Identification is made by measuring the resulting radioisotopes. (12 Dec 1998) |
| neutron capture therapy | A technique for the treatment of neoplasms in which an isotope is introduced into target cells followed by irradiation with thermal neutrons. (12 Dec 1998) |
| neutron radiation | An emission of neutrons from the nucleus of an atom by decay or fission. (05 Mar 2000) |
| integrated neutron flux | <radiobiology> Sum (integral) of the neutron flux (neutrons per unit time per unit area, see flux) over all time, total number of neutrons which passed through a unit area. Important figure-of-merit in testing effects of neutron radiation on materials, and in assessing how long such materials can survive exposure to neutron sources (such as fission reactor cores and D-T fusion plasmas). (09 Oct 1997) |
| thermal neutron | <radiobiology> A neutron in thermal equilibrium with its surrounding environment. Thermal neutrons are those that have been slowed down by a moderator to speeds characteristic of the local temperature. Compare: fast neutron. (09 Oct 1997) |
| fast neutron | <physics> Neutron with energy greater than roughly 100,000 electron volts (100 keV). Distinguished from slow or thermal neutrons. (09 Oct 1997) |
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