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Detection of radio-frequency field with a single spin in diamond

Science Bulletin 2016年第14期61卷 1132-1137页

作者： Ying Liu Fei Kong Fazhan Shi Jiangfeng Du Hefei National Laboratory for Physical Sciences at the Microscale Department of Modern Physics University of Science and Technology of China

Detection of a.c. magnetic field is consequential for many developments in physical and biological sciences,and various designs of magnetometer have been proposed recently. However, the large size of sensor and the extreme measurement conditions required strongly limit their application. It remains a challenge to reconstruct the vector of a.c. field with nanoscale spatial resolution using a single spin under ambient conditions. In this work, we choose the radio-frequency(RF) field as a typical case and realize the measurement of RF field based on a nitrogen-vacancy(NV)center in diamond. We build a solid sensor through measuring the effect of RF field on NV electron spin energy levels and the transition between them. Both of the phase and amplitude(including the transverse and longitudinal components) are measured by this new approach.

关键词： Magnetometer - Nitrogen-vacancy center Quantum metrology radio-frequency field

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Comparison of Hsps Expression after radio-frequency field Exposure in Three Human Glioma Cell Lines

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Biomedical and Environmental Sciences 2009年第5期22卷 374-380页

作者： GUI -RONG DING, XIAO-WU WANG, KANG-CHU LI, LIAN-BO QIU, SHENG-LONG XU, JUAN TAN, AND GUO-ZHEN GUO1 Department of Radiation Medicine, Faculty of Preventive Medicine, Fourth Military Medical University, Xi’an 710032, Shaanxi, China Department of Radiation Medicine Faculty of Preventive Medicine Fourth Military Medical University Xi'an 710032 Shaanxi China

Objective To investigate and compare the effect of radio-frequency （RF） field exposure on expression of heat shock proteins （Hsps） in three human glioma cell lines （MO54, A172, and T98）. Methods Cells were exposed to sham or 1950 MHz continuous-wave for 1 h. Specific absorption rates （SARs） were 1 and 10 W/kg. Localization and expression of Hsp27 and phosphorylated Hsp27 （（78） Ser）（p-Hsp27） were examined by immunocytochemistry. Expression levels of Hsp27, p-Hs27, and Hsp70 were determined by Western blotting. Results The Hsp27 was primarily located within the cytoplasm, p-Hsp27 in both cytoplasm and nuclei of MO54, A172, and T98 cells. RF field exposure did not affect the distribution or expression of Hsp27. In addition, Western blotting showed no significant differences in protein expression of Hsp27 or HspT0 between sham- and RF field-exposed cells at a SAR of 1 W/kg and 10 W/kg for 1 h in three cells lines. Exposure to RF field at a SAR of 10 W/kg for 1 h slightly decreased the protein level of phosphorylated Hsp27 in MO54 cells. Conclusion The 1950 MHz RF field has only little or no apparent effect on Hsp70 and Hsp27 expression in MO54, A172, and T98 cells.

关键词： radio-frequency field Heat shock protein 70 Heat shock protein 27 Protein expression Phosphorylated Hsp27 Glioma cells

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