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2 Jul 2012

Volume 101, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 101, 013701 (2012); http://dx.doi.org/10.1063/1.4730945 (5 pages)

Frederick Gertz, Rustam Azimov, and Alexander Khitun
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Biological cell positioning and spatially selective destruction via magnetic nanoparticles

Frederick Gertz, Rustam Azimov, and Alexander Khitun

Appl. Phys. Lett. 101, 013701 (2012); http://dx.doi.org/10.1063/1.4730945 (5 pages)

Online Publication Date: 2 July 2012

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We report a procedure on biological cells (erythrocytes) where magnetite (Fe3O4) nanoparticles have been used for micro-scale blood cell positioning and space selective destruction. The experiment was accomplished on the top of the microelectromagnet serving as a source of magnetic field and as a local heater at the same time. We observed the controlled motion and focusing of the blood cells dragged by the flow of magnetic nanoparticles. Furthermore, we found that the increase of the electric current through the microelectromagnet leads to the local cell haemolysis. The haemolysis is observed only in the vicinity (5-10 microns) of the current-carrying wires. The whole procedure takes less than 3 seconds. The obtained results provide a rich resource showing the dynamics of cell dragging by the magnetic nanoparticles and demonstrate the feasibility of using magnetic nanoparticles for cell positioning and surgery on the cellular level with micrometer-scale precision.
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87.16.-b Subcellular structure and processes
87.19.Pp Biothermics and thermal processes in biology

C-scan photoacoustic microscopy for invivo imaging of Drosophila pupae

Lei Xi, Lei Zhou, and Huabei Jiang

Appl. Phys. Lett. 101, 013702 (2012); http://dx.doi.org/10.1063/1.4732797 (4 pages) | Cited 2 times

Online Publication Date: 2 July 2012

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In this study, C-scan based high resolution photoacoustic microscopy (CPAM) is devised and used to invivo image the DsRed-expressing cells in the central nervous system (CNS) of Drosophila pupae. The quality of out-of-focus images was improved significantly from both the phantom and invivo experiments. Organs containing DsRed-expressing cells in Drosophila pupae can be imaged using our CPAM and agreed well with the histological sections. This technology allows rapid imaging and monitoring of organismal development in mesoscopic-scale animals as well as the generation of a detailed atlas of CNS development in the pupal stage.
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87.64.M- Optical microscopy
43.80.Ev Acoustical measurement methods in biological systems and media
87.17.Ee Growth and division
87.19.lh Optical imaging of neuronal activity
87.50.Y- Biological effects of acoustic and ultrasonic energy

A synthetic Brownian ratchet architecture for creating tailorable chemomechanical nanomachines

G. Lavella, R. Morfino, and M. M. Maharbiz

Appl. Phys. Lett. 101, 013703 (2012); http://dx.doi.org/10.1063/1.4732154 (5 pages)

Online Publication Date: 3 July 2012

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We present a Brownian ratchet architecture that enables tailorable chemomechanical transduction in synthetic nanomachine and transducer design. In order to test the architecture, we constructed topologically simple nanoscale devices that couple sensing, via molecular binding events, to both mechanical actuation and power harvesting. In these devices, the molecular species that both triggers actuation and supplies energy is selected through the choice of receptor molecule during design. Test devices were set to respond to a streptavidin ligand; for 1 μm and 2 μm long devices, we report an average of 62.8 nm and 140.5 nm, of directed motion, respectively.
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07.07.Mp Transducers
87.85.Qr Nanotechnologies-design

Real-time in situ electron spin resonance measurements on fungal spores of Penicillium digitatum during exposure of oxygen plasmas

Kenji Ishikawa, Hiroko Mizuno, Hiromasa Tanaka, Kazuhiro Tamiya, Hiroshi Hashizume, Takayuki Ohta, Masafumi Ito, Sachiko Iseki, Keigo Takeda, Hiroki Kondo, Makoto Sekine, and Masaru Hori

Appl. Phys. Lett. 101, 013704 (2012); http://dx.doi.org/10.1063/1.4733387 (4 pages)

Online Publication Date: 6 July 2012

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We report the kinetic analysis of free radicals on fungal spores of Penicillium digitatum interacted with atomic oxygen generated plasma electric discharge using real time in situ electron spin resonance (ESR) measurements. We have obtained information that the ESR signal from the spores was observed and preliminarily assignable to semiquinone radical with a g-value of around 2.004 and a line width of approximately 5G. The decay of the signal is possibly linked to the inactivation of the fungal spore. The real-time in situ ESR has proven to be a useful method to elucidate plasma-induced surface reactions on biological specimens.
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87.19.xg Fungal diseases
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