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Series editors' preface - Wood Tools

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168 Conservation of Furniture<br />

(a)<br />

(b)<br />

Figure 4.13 (a) General formula of an amino acid. Each amino acid<br />

consists of an alpha () carbon atom that is attached to a hydrogen atom<br />

(H), an amino group (NH 2), a carboxylic acid group (⎯COOH) and one of<br />

twenty different side chains (R)<br />

(b) The chemical structure of -amino acids in their ionic form (i.e. NH 3+<br />

instead of NH 2, COO – instead of COOH) at pH 7

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