Dosimetric study of isolated neuronal networks under 2.6 GHz radiofrequency exposure / 军事医学

Objective To evaluate the characteristics of dose distribution of neuronal networks in vitro on microelectrode arrays(MEAs)under 2.6 GHz radiofrequency(RF)exposure.Methods The MEAs were coupled with a real-time RF exposure setup,and electromagnetic simulation software was used to calculate the RF dose absorbed in cultured neuronal networks.A fiber-optic temperature probe was used for experimental validation and monitoring of the cell temperature during RF exposure.The MEAs were used to record the electrical activity of neurons.Results For an input power of 1 W,a specific absorption rate(SAR)level of(15.51±2.48)W/kg was calculated,and the variability of the SAR distribution was 16%.In our experimental system,the temperature elevation of neurons was up to 0.15℃for an SAR of 4 W/kg RF exposure.Conclusion The exposure device can provide high SAR efficiency and uniformity in the 2.6 GHz band,which is suitable for studying the real-time effects of RF fields on the electrical activity of neuronal networks in the 5G network band.

Dynamic change of flavonoids' content in various extent of cortex moutan carbonisatum / 中国中药杂志

<p><b>OBJECTIVE</b>Study on the of content variety of flavonoids in the course of processing Cortex Moutan,and discuss the preparation mechanism of Cortex Moutan Carbonisatum (CMC).</p><p><b>METHOD</b>HPLC method was developed for the determination of flavonoids in various extent of CMC, the sample was extracted by ultrasound 30 min twice along with ethanol 50 mL. Chromatographic conditions were as follows: wavelength 360 nm, gradient eluant of methanol--0.5% per hundred trifluoroacetic acid.</p><p><b>RESULT</b>The content of the three flavonoids cuts down along with the processing time and the rising temperature.</p><p><b>CONCLUSION</b>The impact of various extent of processing on flavonoids content of the CMC is very great. The overall trend is that high temperature and long time lead to the lower of the content of flavonoids. This provides a basis data for the further study on the hemostatic mechanism and quality control of CMC.</p>

HPLC fingerprints of Cortex Moutan Carbonisatum / 中国中药杂志

<p><b>OBJECTIVE</b>To establish the analytical method of the HPLC fingerprint of Cortex Moutan Carbonisatum and offer the evidence for quality control and quality evaluation of carbonized Cortex Moutan accordingly.</p><p><b>METHOD</b>Ten batches of Cortex Moutan Carbonisatum were measured by HPLC with Paeonol as a reference substance and the HPLC analysis was performed on a Hedera ODS-3 Chromatographic Column (4.6 mm x 150 mm, 5 microm), with methanol to Acetonitrile (1:1) and 0.5% trifluoroacetic acid solution as mobile phase in gradient mode and the detection wavelength was at 258 nm.</p><p><b>RESULT</b>The common mode of the HPLC fingerprints were set up. There were 11 common peaks in the fingerprint of ten samples, and the similar degrees to the ten batches were between 0.830-0.991.</p><p><b>CONCLUSION</b>The method is simple, accurate and have a good reaptability. And the quality of Cortex Moutan Carbonisatum can be controlled effectively by the HPLC fingerprint.</p>