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22 Oct 2012

Volume 101, Issue 17, Articles (17xxxx)

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Appl. Phys. Lett. 101, 171101 (2012); http://dx.doi.org/10.1063/1.4758996 (4 pages)

Wolfram H. P. Pernice and Harish Bhaskaran
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Study of molecule variation in various grades of human nuclear cataracts by confocal micro-Raman spectroscopy

Zhengfei Zhuang, Meifang Zhu, Yanyue Huang, Jie Liu, Zhouyi Guo, Ke Xiong, Ning Li, Sijin Chen, and Xuejun Qiu

Appl. Phys. Lett. 101, 173701 (2012); http://dx.doi.org/10.1063/1.4762838 (3 pages)

Online Publication Date: 24 October 2012

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Confocal micro-Raman spectroscopy is employed to characterize various grades of human cataracts. Results show that the intensity ratio of the tyrosine doublet (I855/I833) changes from 1:1.07 ± 0.03 to 1:1.17 ± 0.05 with the aggravation of cataracts, which indicates that there are more tyrosine residues bound to strong H acceptors instead of bounding to water. The decrease of relative intensity at 880 cm−1 band suggests that the “buried” tryptophan residues become “exposed” during the course of lens opacification. A three-dimensional principal component analysis is used to classify the Raman spectra of opacity tissues, which show a one-to-one correspondence with different grades of cataracts.
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87.64.kp Raman
87.64.mk Confocal
87.15.M- Spectra of biomolecules
42.66.Ct Anatomy and optics of eye

Variable-thickness multilayered polyvinylidene fluoride transducer with improved sensitivity and bandwidth for photoacoustic imaging

Lei Xi, Xiaoqi Li, and Huabei Jiang

Appl. Phys. Lett. 101, 173702 (2012); http://dx.doi.org/10.1063/1.4764051 (4 pages)

Online Publication Date: 24 October 2012

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The performance of photoacoustic imaging (PAI) is critically dependent on the sensitivity and bandwidth of the transducer. Here, we report the design and fabrication of a polyvinylidene fluoride ultrasonic transducer with variable-thickness layers that demonstrates significantly improved sensitivity and bandwidth. We show that the multilayered transducer provides more than 2-fold increase in sensitivity and more than 65% improvement in bandwidth compared with the conventional single-layer transducer. Photoacoustic imaging of mouse brain with the intact skull and scalp is conducted to demonstrate the power of the multilayered transducer for resolving brain structure in an in vivo setting.
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78.20.Pa Photoacoustic effects
43.35.Ud Thermoacoustics, high temperature acoustics, photoacoustic effect
43.38.Fx Piezoelectric and ferroelectric transducers

Energy transfer from conjugated polymer to bacterial light-harvesting complex

D. Buczynska, Ł. Bujak, M. A. Loi, T. H. P. Brotosudarmo, R. Cogdell, and S. Mackowski

Appl. Phys. Lett. 101, 173703 (2012); http://dx.doi.org/10.1063/1.4764082 (4 pages) | Cited 1 time

Online Publication Date: 26 October 2012

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Energy transfer from a conjugated polymer blend (poly(9,9-dioctylfluorenyl-2,7-diyl):poly (2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene) to a light-harvesting complex 2 from purple bacteria has been demonstrated using time-resolved fluorescence spectroscopy. For our hybrid nanostructure, we observe a 30% reduction of the fluorescence lifetime of the polymer emission as compared to the pure polymer layer. This result is an important step towards integrating naturally evolved biomolecules with synthetic materials into biohybrid organic electronic systems.
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87.16.-b Subcellular structure and processes
87.15.mq Luminescence
87.14.E- Proteins
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