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By Rudy J. Koopmans (Eds.)

ISBN-10: 012374752X

ISBN-13: 9780123747525

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Extra info for Engineering Aspects of Self-Organizing Materials

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PH as a trigger of peptide beta-sheet self-assembly and reversible switching between nematic and isotropic phases’’. J. Am. Chem. Soc. 125(32), 9619–9628 (2003b). , ‘‘Self-Assembling Peptide Systems in Biology, Medicine and Engineering’’. Kluwer Academic Publishers, Dordrecht, The Netherlands (2001a). , and Boden, N. ‘‘Hierarchical self-assembly of chiral rod-like molecules as a model for peptide beta-sheet tapes, ribbons, fibrils, and fibers’’. Proc. Nat. Acad. Sci. A. 98(21), 11857–11862 (2001b).

Davies et al. , 2005). It was shown that the presence of the surface has a profound effect on peptide self-assembly. Monomeric peptides in solution below the critical concentration for solution self-assembly were found to interact with the mica surface via the charged amino acid residues Arg and Glu present on the polar side of the peptide and the corresponding negative charges and positively charged counterions on mica surface. 8 nm in agreement with the molecular dimensions (Figure 16). Effectively, the solid surface acts as a template for the induction of peptide self-assembly at concentrations well below their critical concentration for self-assembly in solution.

This enables fast isotropic fluid-to-nematic and fluid-to-gel transitions to be triggered by relatively small additions of acid or base, typically one part in 103 by volume of 1 M HCl or NaOH, corresponding to a change of pH by a single unit (Figures 8 and 9). , 2006). , 1993). The arrangement of the individual amino acids gives rise to two distinct faces: a hydrophobic side comprising solely alanines, and a charged side, of negative glutamic acid residues and positive lysine residues. This motif resulted in the rational design of a class of EKA16 peptides that could respond to a host of external environmental triggers.

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Engineering Aspects of Self-Organizing Materials by Rudy J. Koopmans (Eds.)

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