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28 Dec 2009

Volume 95, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 95, 261901 (2009); http://dx.doi.org/10.1063/1.3268436 (3 pages)

Weiqiang Wang, Richard Clark, Aiichiro Nakano, Rajiv K. Kalia, and Priya Vashishta
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Stabilization of fluorophore in DNA thin films

Yogesh Ner, Daminda Navarathne, Dariusz M. Niedzwiedzki, James G. Grote, Andrey V. Dobrynin, Harry A. Frank, and Gregory A. Sotzing

Appl. Phys. Lett. 95, 263701 (2009); http://dx.doi.org/10.1063/1.3262944 (3 pages) | Cited 4 times

Online Publication Date: 30 December 2009

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The photostability of the nonlinear optical dye, Hemi-22, improves upon encapsulation in DNA thin films. The interactions of Hemi-22 with DNA, along with the intrinsic properties of DNA are responsible for these remarkable improvements in the photostability of the dye in comparison to the dye in a poly(methyl methacrylate) as a control.
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78.66.Qn Polymers; organic compounds
87.14.gk DNA
78.55.Kz Solid organic materials

Phase transition in tetragonal hen egg-white lysozyme crystals

A. V. Svanidze, H. Huth, S. G. Lushnikov, Seiji Kojima, and C. Schick

Appl. Phys. Lett. 95, 263702 (2009); http://dx.doi.org/10.1063/1.3275858 (3 pages) | Cited 2 times

Online Publication Date: 30 December 2009

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Lattice dynamics of tetragonal hen egg-white lysozyme crystals was studied by Brillouin light scattering and differential ac-nanocalorimetry with controlled relative humidity from 298 to 330 K. Temperature dependences of fast quasitransverse phonon velocity and integral intensity were found to exhibit anomalies in the vicinity of 306 K. An anomaly in the temperature behavior of heat capacity was also observed near this temperature. It is concluded that the anomalies point to a structural phase transition. Possible mechanisms of phase transition in lysozyme crystals are discussed.
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87.64.Cc Scattering of visible, uv, and infrared radiation
87.14.ej Enzymes
87.15.B- Structure of biomolecules
87.15.M- Spectra of biomolecules
87.15.Zg Phase transitions
87.19.Pp Biothermics and thermal processes in biology

Three dimensional microstructuring of biopolymers by femtosecond laser irradiation

M. Oujja, S. Pérez, E. Fadeeva, J. Koch, B. N. Chichkov, and M. Castillejo

Appl. Phys. Lett. 95, 263703 (2009); http://dx.doi.org/10.1063/1.3274127 (3 pages) | Cited 4 times

Online Publication Date: 31 December 2009

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A sequence of single femtosecond pulses is used to create a pattern of laser affected spots at increasing depths below the surface of transparent biopolymer samples. Materials with different water contents and mechanical strengths, gelatine, chitosan, synthetic polyvinyl pyrrolidone, and biopolymer-polymer blends, are irradiated near the edge of the sample with an amplified Titanium:Sapphire laser (800 nm) delivering 30 fs pulses through a 0.45 numerical aperture objective with energies of 100–3000 nJ. The micrometric modified region is observed by optical microscopy perpendicularly to irradiation. Self-focusing and optical aberration are major factors controlling morphology and size of the created spots.
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87.85.jf Bio-based materials
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.62.Be Biological and medical applications
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
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