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2 May 2005

Volume 86, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 86, 181101 (2005); http://dx.doi.org/10.1063/1.1920407 (3 pages)

Giacomo Scalari, Nicolas Hoyler, Marcella Giovannini, and Jérôme Faist
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Simultaneous static and dynamic light scattering approach to the characterization of the different fibrin gel structures occurring by changing chloride concentration

Massimiliano Papi, Giuseppe Arcovito, Marco De Spirito, Gino Amiconi, Andrea Bellelli, and Giovanna Boumis

Appl. Phys. Lett. 86, 183901 (2005); http://dx.doi.org/10.1063/1.1915526 (3 pages) | Cited 6 times

Online Publication Date: 26 April 2005

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The structure of fibrin fibers has been investigated by simultaneous elastic and dynamic light scattering measurements. This approach allows the recovery of reliable structural parameters of the fibrin fibers while checking for the reliability of the necessarily ab initio assumptions on some nonexperimentally accessible parameters. The number of protofibrils per fiber section, N, related to the fiber diameter, and the gel mass fractal dimension Dm are obtained. Since the fiber size is largely controlled by ions in the gelling solution, a detailed characterization of the fiber structure formed by changing Cl− concentration is given. While N values decrease from 6000 to 1.5 protofibrils per fiber section, going from 0 to 300 mM in CCl−, Dm increases from 1 to 1.8. This means that the overall gel structure is affected by Cl−, being the fiber size decreased and branch points per unit volume increased.
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87.14.E- Proteins
87.15.B- Structure of biomolecules
87.64.Cc Scattering of visible, uv, and infrared radiation
87.80.-y Biophysical techniques (research methods)
82.70.Gg Gels and sols
36.20.Hb Configuration (bonds, dimensions)

Adaptive optical biocompact disk for molecular recognition

Leilei Peng, Manoj M. Varma, Fred E. Regnier, and David D. Nolte

Appl. Phys. Lett. 86, 183902 (2005); http://dx.doi.org/10.1063/1.1915511 (3 pages) | Cited 4 times

Online Publication Date: 28 April 2005

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We report the use of adaptive interferometry to detect a monolayer of protein immobilized in a periodic pattern on a spinning glass disk. A photorefractive quantum-well device acting as an adaptive beam mixer in a two-wave mixing geometry stabilizes the interferometric quadrature in the far field. Phase modulation generated by the spinning biolayer pattern in the probe beam is detected as a homodyne signal free of amplitude modulation. Binding between antibodies and immobilized antigens in a two-analyte immunoassay was tested with high specificity and without observable cross reactivity.
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87.80.-y Biophysical techniques (research methods)
87.15.B- Structure of biomolecules
87.14.E- Proteins
42.79.Vb Optical storage systems, optical disks
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
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