𝔖 Bobbio Scriptorium
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Principals’ informal methods for appraising poor-performing teachers

✍ Scribed by Eliezer Yariv


Book ID
106491186
Publisher
Springer
Year
2009
Tongue
English
Weight
189 KB
Volume
21
Category
Article
ISSN
1874-8597

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✍ P. Fürst; L. Pollack; T.A. Graser; H. Godel; P. Stehle 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 864 KB

## Reversed-phase high-performance liquid chromatography (RP-HPLC) is a powerful method for assaying physiological amino acid concentrations in biological fluids. Four pre-column derivatization methods, with o-phthaldialdehyde (OPA), 9fluorenylmethyl chloroformate (FMOC-Cl), phenyl isothiocyanate