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27 Sep 2010

Volume 97, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 97, 133303 (2010); http://dx.doi.org/10.1063/1.3491815 (3 pages)

Yoshihide Fujisaki, Yoshiki Nakajima, Daisuke Kumaki, Toshihiro Yamamoto, Shizuo Tokito, Takahiro Kono, Jun-ichi Nishida, and Yoshiro Yamashita
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A study of eukaryotic response mechanisms to atmospheric pressure cold plasma by using Saccharomyces cerevisiae single gene mutants

Hongqing Feng, Ruixue Wang, Peng Sun, Haiyan Wu, Qi Liu, Jing Fang, Weidong Zhu, Fangting Li, and Jue Zhang

Appl. Phys. Lett. 97, 131501 (2010); http://dx.doi.org/10.1063/1.3491180 (3 pages) | Cited 6 times

Online Publication Date: 29 September 2010

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The mechanisms of eukaryotic cell response to cold plasma are studied. A series of single gene mutants of eukaryotic model organism Saccharomyces cerevisiae are used to compare their sensitivity to plasma treatment with the wild type. We examined 12 mutants in the oxidative stress pathway and the cell cycle pathway, in which 8 are found to be hypersensitive to plasma processing. The mutated genes’ roles in the two pathways are analyzed to understand the biological response mechanisms of plasma treatment. The results demonstrate that genes from both pathways are needed for the eukaryotic cells to survive the complex plasma treatment.
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87.53.-j Effects of ionizing radiation on biological systems
87.16.-b Subcellular structure and processes

Mechanisms of x-ray emission from peeling adhesive tape

E. Constable, J. Horvat, and R. A. Lewis

Appl. Phys. Lett. 97, 131502 (2010); http://dx.doi.org/10.1063/1.3493653 (3 pages) | Cited 3 times

Online Publication Date: 29 September 2010

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It has previously been reported that x-rays are emitted when adhesive tape is peeled in a vacuum but no account of the dependence of the x-ray emission on the pressure of the environment has been given to date. In this paper we present detailed experimental data on the number and angular distribution of x-ray photons as a function of pressure. We find that x-rays are emitted for pressures between p0 = 10−3 and p1 = 10−2 mBar, with ∼ 106 counts/(cm2 s) recorded by a 256×256 pixel2 silicon array sensor placed 35 mm from the tape. The main role of the tape is found to be the build-up of an acceleration potential sufficient to produce x-rays by bremsstrahlung of free electrons in a low-pressure gas. The source of the free electrons is the gas. Our model shows that the production rate of uncompensated tape charge and absorption of positive ions from the gas define p1. The angular distribution of the radiation shows a pressure-independent 20° wide peak in the direction perpendicular to electron motion. Ordinary bremsstrahlung cannot describe this peak.
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78.70.Ck X-ray scattering
46.55.+d Tribology and mechanical contacts
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