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28 Jan 2008

Volume 92, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 92, 041901 (2008); http://dx.doi.org/10.1063/1.2831926 (3 pages)

M. A. Avila, K. Suekuni, K. Umeo, H. Fukuoka, S. Yamanaka, and T. Takabatake
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Investigation of water-soluble x-ray luminescence nanoparticles for photodynamic activation

Yuanfang Liu, Wei Chen, Shaopeng Wang, and Alan G. Joly

Appl. Phys. Lett. 92, 043901 (2008); http://dx.doi.org/10.1063/1.2835701 (3 pages) | Cited 28 times

Online Publication Date: 29 January 2008

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In this letter, we report the synthesis of LaF3:Tb3+–meso-tetra(4-carboxyphenyl) porphine (MTCP) nanoparticle conjugates and investigate the energy transfer as well as singlet oxygen generation following x-ray irradiation. Our observations indicate that LaF3:Tb3+-MTCP nanoparticle conjugates are efficient photodynamic agents that can be initiated by x-rays at a reasonably low dose. The addition of folic acid to facilitate targeting to folate receptors on tumor cells has no effect on the quantum yield of singlet oxygen production in the nanoparticle-MTCP conjugates. Our pilot studies indicate that water-soluble scintillation nanoparticles can potentially be used to activate photodynamic therapy as a promising deep cancer treatment modality.
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87.85.Rs Nanotechnologies-applications
87.16.-b Subcellular structure and processes
87.19.xj Cancer

Elastic response of the resurrection fern Polypodium polypodioides during rehydration

L. E. Helseth

Appl. Phys. Lett. 92, 043902 (2008); http://dx.doi.org/10.1063/1.2838357 (3 pages)

Online Publication Date: 30 January 2008

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The resurrection fern (Polypodium polypodioides) has a remarkable elastic reponse, where the fast water uptake of the fern upon rehydration is accompanied by a significant reduction in its Young’s modulus. In this letter, we discuss the fern’s elastic response and suggest that by mimicking its structure, one should be able to design materials exhibiting interesting elastic behavior.
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87.85.G- Biomechanics
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