| FTIR | Fourier-transformed infrared; functional terminal innervation ratio |
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| NIRS | near-infrared spectroscopy; normal inactivated rabbit serum |
| NIS | nationwide impatient sample; near-infrared intracranial spectroscopy; N-iodosuccinimide; no inflamma... |
| RAIS | reflection-absorption infrared spectroscopy |
| FAST | flow-assisted, short-term [balloon catheter]; fluorescent antibody staining technique; fluoro-allerg... |
| electron spin resonance spectroscopy | <radiology> A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. electron nuclear double resonance (endor) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications. (12 Dec 1998) |
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| Energy Dispersive Spectroscopy | <technique> A microanalytical technique that is based on the characteristic X-ray peaks that are generated when the high energy beam of the electron microscope interacts with the specimen. Each element yields a characteristic spectral fingerprint that may be used to identify the presence of that element within the sample. The relative intensities of the spectral peaks may be used to determine the relative concentrations of each element in the specimen. The X-ray signal is detected by a solid-state silicon-lithium detector and the construction and efficiency of this detector sets a lower limit on the atomic number that may be detected. Generally elements heavier than carbon (Z=5) are detectable. Acronym: EDS (05 Aug 1998) |
| spectrophotometry, infrared | Spectrophotometry in the infrared region, usually for the purpose of chemical analysis through measurement of absorption spectra associated with rotational and vibrational energy levels of molecules. (12 Dec 1998) |
| infrared | That portion of the electromagnetic spectrum with wavelengths between 770 and 1000 nm. (05 Mar 2000) |
| infrared cataract | A cataract secondary to absorption of heat by the lens, or by transmission from the adjacent iris. Synonym: furnacemen's cataract, glassworker's cataract. (05 Mar 2000) |
| infrared light | See: infrared. Invisible light, historic term for X-rays. (05 Mar 2000) |
| infrared microscope | <instrument> A microscope that is equipped with infrared transmitting optics and that measures the infrared absorption of minute samples with the aid of photoelectric cells; images may be observed with image converters or television. (05 Mar 2000) |
| infrared radiation | Electromagnetic radiation with wavelengths between 750 nanometres and 1,000,000 nanometres (or 1 millimetre). This is more commonly known as heat energy. (09 Oct 1997) |
| infrared ray | See: infrared. (05 Mar 2000) |
| infrared rays | That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants. (12 Dec 1998) |
| infrared spectrum | The part of the invisible spectrum of wave length just longer than that of visible red light. Synonym: thermal spectrum. (05 Mar 2000) |