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Section 3. Method development: 21. Ultra-sensitive elemental analyzer/isotope ratio mass spectrometer for stable nitrogen and carbon isotope analyses / Ogawa, N.O. ... [et al.] -- 22. An improved method for precise determination of carbon isotopic composition of amino acids / Chikaraishi, Y. and Ohkouchi, N. -- 23. Instrumental optimization of compound-specific nitrogen isotope analysis of amino acids by gas chromatography/combustion/isotope ratio mass spectrometry / Chikaraishi, Y. ... [et al.] -- 24. Enantiomer-specific isotope analysis of D-and L-alanine / Takano, Y., Chikaraishi, Y. and Ohkouchi, N. -- Appendix. Summary of methods for measuring isotopic compositions presented in this book / Ohkouchi, N., Tayasu, I., and Koba, K.