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7 May 2007

Volume 90, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 90, 193501 (2007); http://dx.doi.org/10.1063/1.2737344 (3 pages)

Peter Modregger, Daniel Lübbert, Peter Schäfer, and Rolf Köhler
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Detection of single biomolecule fluorescence excited through energy transfer: Application to light-harvesting complexes

S. Wörmke, S. Mackowski, T. H. P. Brotosudarmo, Ch. Bräuchle, A. Garcia, P. Braun, H. Scheer, and E. Hofmann

Appl. Phys. Lett. 90, 193901 (2007); http://dx.doi.org/10.1063/1.2737429 (3 pages) | Cited 7 times

Online Publication Date: 9 May 2007

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The authors show that energy transfer is a feasible mechanism for exciting fluorescence of single light-harvesting complexes with different characters of the fluorescing state. This approach is applied for excitons consisting of 18 strongly coupled bacteriochlorophylls in light-harvesting complex 2 as well as for peridinin-chlorophyll-protein monomers containing either two chlorophyll a molecules or a pair of chlorophyll a and chlorophyll b characterized with the emission energy difference of 400 cm−1. Using this method the authors are able to observe fluorescence spectral dynamics on the scale comparable or larger than the emission linewidth of a single chromophore.
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87.15.M- Spectra of biomolecules
33.50.Dq Fluorescence and phosphorescence spectra

Experimental and ab initio study of the mechanical properties of hydroxyapatite

R. Snyders, D. Music, D. Sigumonrong, B. Schelnberger, J. Jensen, and J. M. Schneider

Appl. Phys. Lett. 90, 193902 (2007); http://dx.doi.org/10.1063/1.2738386 (3 pages) | Cited 15 times

Online Publication Date: 10 May 2007

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The authors have studied the elastic properties of radio frequency sputtered phase pure, stoichiometric, and dense hydroxyapatite films by nanoindentation. The measured elastic modulus values have been compared to ab initio calculated data. The calculation technique was based on the determination of all elastic constants. The calculated and measured elastic modulus values differ by ∼ 10%. The good agreement indicates that the elasticity of hydroxyapatite can be described using ab initio calculations, establishing the elastic modulus thereof.
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81.05.-t Specific materials: fabrication, treatment, testing, and analysis
81.40.Jj Elasticity and anelasticity, stress-strain relations
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure
62.20.D- Elasticity
62.20.M- Structural failure of materials
68.60.Bs Mechanical and acoustical properties
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