Foster K R, Epstein B R, Gealt M A
Department of Bioengineering, University of Pennsylvania, Philadelphia 19104.
Biophys J. 1987 Sep;52(3):421-5. doi: 10.1016/S0006-3495(87)83231-9.
An attempt was made to confirm previous reports of resonant-like dielectric absorption of plasmid DNA in aqueous solutions at 1-10 GHz. The dielectric properties of the sample were measured using an automatic network analyzer with two different techniques. One technique used an open-ended coaxial probe immersed in the sample; the other employed a coaxial transmission line. No resonances were observed that could be attributed to the sample; however, resonance-type artifacts were prominent in the probe measurements. The coaxial line technique appears to be less susceptible to such artifacts. We note two important sources of error in the calibration of the automatic network analyzer using the probe technique.
人们试图证实先前关于水溶液中质粒DNA在1 - 10 GHz频率下类似共振的介电吸收的报道。使用自动网络分析仪通过两种不同技术测量了样品的介电特性。一种技术是将开口同轴探头浸入样品中；另一种则采用同轴传输线。未观察到可归因于样品的共振现象；然而，共振型伪像在探头测量中很突出。同轴传输线技术似乎较不易受此类伪像的影响。我们指出了使用探头技术对自动网络分析仪进行校准时的两个重要误差来源。
