mass spectrometry

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mass spectrometry

(mas spek-trom'ĕ-trē),
The analysis obtained using a mass spectrograph.

mass spectrometry

A method for identifying molecules based on the detection of the mass-to-charge ratio of ions generated from the molecule by vaporisation and electron bombardment. Deflection of the ions through a magnetic field results in a characteristic pattern which is used to define the molecule of interest.
References in periodicals archive ?
The thermal genetic methane ([[delta].sup.13][C.sup.1] = -45.78%) in the natural gas from Kazakhstan and the partially reversal carbon isotopic distribution pattern ([[delta].sup.13][C.sup.1] < [[delta].sup.13][C.sup.2] > [[delta].sup.13] [C.sup.3]> [[delta].sup.13][C.sup.4] > [[delta].sup.13][C.sup.5]), which was due to secondary alterations under high temperature such as oil, gas cracking, and diffusion, indicate the complicate organic thermal evolution process.
Genetic variants obviously change the chemical composition and will therefore change the isotopic distribution, but, at least in the case of substitutions or small insertions and deletions, this change does not affect the targeted isotopic fitting procedure.
In contrast to the thermogenic isotopic distribution pattern shown in Figure 1, a series of Canadian Shield hydrocarbon gases recently studied at Kidd Creek Mine, Timmins, ON show a significant depletion in [C.sup.13] for [C.sub.2]-[C.sub.4] with respect to [C.sub.1] (4).
What's more, and most peculiar, certain metals seemed to have also changed their isotopic distribution.
The reasons for my inquiry were twofold: If the fragments were not of this planet--or even this solar system--the isotopic distribution probably would be different.
In the area of rock and mineral geochemistry, projects include investigation of the causes of clay and related mineral diagenesis, elucidation of the kinetics of complex carbonate formation, explanation of the formation and evolution of igneous rocks and their associated ore deposits from elemental and isotopic distribution data, and petrologic studies of meteorites.
I will also use a complementary isotope imaging technique, the so-called CryoNanoSIMS (developed at my institution over the last year), which can image isotopic distributions in frozen tissue sections and reveal the localization of injected substrates and their metabolites with subcellular spatial resolution.