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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. GC-MS Gas chromatography-mass spectrometry; an analytical tool that separates molecules by chromatography and then analyzes them for their mass. IDP Interplanetary dust particle. IR Infrared. LSCM Laser scanning confocal microscope. MALDI Matrix assisted laser desorption and ionization; a way of elevating large molecules into the gas phase to permit their analysis in a mass spectrometer that involves embedding these in a matrix, and then putting energy into the matrix to sputter it and the molecule of interest into the “gas phase.” MPN Most probable number. mRNA Messenger RNA. PCR Polymerase chain reaction. rRNA Ribosomal RNA. RNA Ribonucleic acid. S Svedberg; a unit of sedimentation coefficient, equal to 10−13 second. SAED Selected area electron diffraction. SEM Scanning electron microscopy; images objects as small as 1 nanometer. SIMS Secondary ion mass spectrometry. SNC meteorites Three small classes of basaltic meteorites (shergottites, nakhlites, and chassignites) thought to have been ejected from Mars 's surface during an impact. TEM Transmission electron microscopy. TOF Time of flight; a type of mass spectrometry that assesses the mass of an ion by the time that it takes to move in an electric field. TPF Terrestrial Planet Finder. UV Ultraviolet. XAFS X-ray absorption fine structure. XRD X-ray diffraction. XRF X-ray fluorescence.
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