Felix Bauer

University of Bayreuth , Bayreuth, Bavaria, Germany

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Publications (3)16.71 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Silk fibers are well known for their mechanical properties such as strength and toughness and are lightweight, making them an interesting material for a variety of applications. Silk mechanics mainly rely on the secondary structure of the underlying proteins. Lacewing egg stalk silk proteins obtain a cross-β structure with individual β strands aligned perpendicular to the fiber axis. This structure is in contrast with that of silks of spiders or silkworms with β strands parallel to the fiber axis and to that of silks of honeybees with α helices arranged in coiled coils. On the basis of the cross-β structure the mechanical properties of egg stalks are different from those of other silks concerning extensibility, toughness, and bending stiffness. Here we show the influence of relative humidity on the mechanical behavior of lacewing egg stalks and propose a model based on secondary structure changes to explain the differences on a molecular level. At low relative humidity, the stalks rupture at an extension of 3%, whereas at high relative humidity the stalks rupture at 434%. This dramatic increase corresponds to breakage of hydrogen bonds between the β strands and a rearrangement thereof in a parallel-β structure.
    Biomacromolecules 10/2012; · 5.37 Impact Factor
  • Felix Bauer, Thomas Scheibel
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    ABSTRACT: Ei am Stiel: Florfliegen schützen ihre Eier vor Fraßfeinden auf kleinen Stielen (siehe Bild). Die Stiele haben gute mechanische Eigenschaften und anders als die meisten Seiden eine Cross‐β‐Struktur. Aus einem artifiziellen und rekombinant hergestellten Protein nach dem Vorbild eines sequenzierten Florfliegen‐Eierstielproteins konnte ein künstlicher Stiel produziert werden, der 90 % der Zugfestigkeit eines natürlichen Stiels aufweist.
    Angewandte Chemie 06/2012; 124(26).
  • Felix Bauer, Thomas Scheibel
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    ABSTRACT: Rigid threads: Lacewings protect their eggs from predators by laying them on small stalks (see picture). The stalks have good mechanical properties and, unlike most other silks, a cross β structure. An artificial egg stalk was produced using a designed recombinant variant of a sequenced lacewing egg stalk protein, and it attained 90 % of the tensile strength of a natural egg stalk.
    Angewandte Chemie International Edition 05/2012; 51(26):6521-4. · 11.34 Impact Factor

Publication Stats

2 Citations
16.71 Total Impact Points

Institutions

  • 2012
    • University of Bayreuth
      • Lehrstuhl für Biomaterialien
      Bayreuth, Bavaria, Germany