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5 Dec 2005

Volume 87, Issue 23, Articles (23xxxx)

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Appl. Phys. Lett. 87, 234101 (2005); http://dx.doi.org/10.1063/1.2140082 (3 pages)

Ben McMillen, Chuck Jewart, Michael Buric, Kevin P. Chen, Yuankun Lin, and Wei Xu
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Control of the active site structure of giant bilayer hemoglobin from the Annelid Eisenia foetida using hierarchic assemblies

Marco Girasole, Alessandro Arcovito, Augusta Marconi, Camilla Davoli, Agostina Congiu-Castellano, Andrea Bellelli, and Gino Amiconi

Appl. Phys. Lett. 87, 233901 (2005); http://dx.doi.org/10.1063/1.2137448 (3 pages)

Online Publication Date: 28 November 2005

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The active site structure of the oxygenated derivative of the main subassemblies (whole protein, dodecamers, and trimers) of the giant haemoglobin from Eisenia foetida has been characterized by x-ray absorption near edge structure spectroscopy. The data revealed a remarkable effect of the hierarchic assemblies on the active site of the subunit. Specifically, the whole protein has the same site structure of the dodecamer, while a sharp conformational transition occurs when the dodecamer is disassembled into trimers (and monomers) revealing that constraints due to the protein matrix determine the active site geometry and, consequently, the protein function in these large complexes.
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87.15.B- Structure of biomolecules
87.15.H- Dynamics of biomolecules
87.14.E- Proteins
36.20.Ey Conformation (statistics and dynamics)
33.20.Rm X-ray spectra

Marine diatoms as optical chemical sensors

Luca De Stefano, Ivo Rendina, Mario De Stefano, Alfredo Bismuto, and Pasqualino Maddalena

Appl. Phys. Lett. 87, 233902 (2005); http://dx.doi.org/10.1063/1.2140087 (3 pages) | Cited 32 times

Online Publication Date: 30 November 2005

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Complex micro- and nanostructured materials for optical sensing purposes are designed and fabricated using top technologies. A completely different approach to engineering systems at the nanoscale consists in recognizing the nanostructures and morphologies that nature has optimized during life’s history on earth. We have found that the photoluminescence emission from silica skeleton of marine diatoms Thalassiosira rotula Meunier is strongly dependent on the surrounding environment. Both the optical intensity and the peaks positions are affected by gases and organic vapors. Depending on the electronegativity and polarizing ability, some substances quench the luminescence, while others effectively enhance it. These phenomena allow the discrimination between different substances. These naturally occurring organisms are thus good candidates as optical sensing materials.
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87.80.-y Biophysical techniques (research methods)
87.16.Gj Cell walls
82.80.-d Chemical analysis and related physical methods of analysis
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