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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nitrogen-15 nuclear magnetic resonance spectroscopy ： ウィキペディア英語版 Nitrogen-15 nuclear magnetic resonance spectroscopy Nitrogen-15 nuclear magnetic resonance spectroscopy (nitrogen-15 NMR spectroscopy, or just simply 15N NMR) is a version of nuclear magnetic resonance spectroscopy that examines samples containing the 15N nucleus.〔Witanowski, M (1974). “Nitrogen N.M.R. Spectroscopy”. Pure and Applied Chemistry. 37, pp. 225-233. 〕 15N NMR differs in several ways from the more common 13C and 1H NMR. To lift the restraint of spin 1 found in 14N, 15N NMR is employed in samples for detection since it has a ground-state spin of ½. Since14N is 99.64% abundant, incorporation of 15N into samples often requires novel synthetic techniques. Two sources of nitrogen-15 are the positron emission of oxygen-15 and the beta decay of carbon-15. Nitrogen-15 is frequently used in nuclear magnetic resonance spectroscopy (NMR), because unlike the more abundant nitrogen-14, that has an integer nuclear spin and thus a quadrupole moment, 15N has a fractional nuclear spin of one-half, which offers advantages for NMR like narrower line width. Proteins can be isotopically labeled by cultivating them in a medium containing nitrogen-15 as the only source of nitrogen. In addition, nitrogen-15 is used to label proteins in quantitative proteomics (e.g. SILAC). ==Implementation== 15N NMR has complications not encountered in 1H and 13C NMR spectroscopy. The 0.36% natural abundance of 15N results in a major sensitivity penalty. Sensitivity is made worse by its low gyromagnetic ratio (γ = -27.126 × 106 T−1s−1), which is 10.14% that of 1H. The signal to noise ratio for 1H is about 300 fold greater than 15N at the same magnetic field. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nitrogen-15 nuclear magnetic resonance spectroscopy」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.