This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel...This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel seed-generation design,allowing for a variable pulse duration spanning over more than three orders of magnitude, from 3.45 picoseconds to 10 nanoseconds. This makes it suitable for various plasma diagnostics and visualization techniques. In a side-view configuration, the laser was employed for interferometry and streaked shadowgraphy of a laser-induced plasma while successfully suppressing the self-emission background of the laser±plasma interaction, resulting in a signal-to-self-emission ratio of 110 for this setup. These properties enable the probe to yield valuable insights into the plasma dynamics and interactions at the PHELIX facility and to be deployed at various laser facilities due to its easy-to-implement design.展开更多
The interaction of water-soluble P-(N,N-dimethylaminomethyl)-calix[8]arene(CX8)with calf thymus DNA was studied using neutral red(NR) as a probe by uv-vis spectroscopy.The effect factors such as the pH of solution and...The interaction of water-soluble P-(N,N-dimethylaminomethyl)-calix[8]arene(CX8)with calf thymus DNA was studied using neutral red(NR) as a probe by uv-vis spectroscopy.The effect factors such as the pH of solution and ionic strength on the spectra were also investigated.The interaction mechanism was proposed.The results show that the strong electrostatic interaction between DNA and CX8 existed,on the one hand,the oxyphosphate anion of DNA can be neutralized by CX8 partally,which induced the contraction of DNA and the conformational change of DNA,which led to release NR from NDA partially.On the other hand,the CX8 can also compete the electrostatic sites with NR directly.展开更多
文摘This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel seed-generation design,allowing for a variable pulse duration spanning over more than three orders of magnitude, from 3.45 picoseconds to 10 nanoseconds. This makes it suitable for various plasma diagnostics and visualization techniques. In a side-view configuration, the laser was employed for interferometry and streaked shadowgraphy of a laser-induced plasma while successfully suppressing the self-emission background of the laser±plasma interaction, resulting in a signal-to-self-emission ratio of 110 for this setup. These properties enable the probe to yield valuable insights into the plasma dynamics and interactions at the PHELIX facility and to be deployed at various laser facilities due to its easy-to-implement design.
文摘The interaction of water-soluble P-(N,N-dimethylaminomethyl)-calix[8]arene(CX8)with calf thymus DNA was studied using neutral red(NR) as a probe by uv-vis spectroscopy.The effect factors such as the pH of solution and ionic strength on the spectra were also investigated.The interaction mechanism was proposed.The results show that the strong electrostatic interaction between DNA and CX8 existed,on the one hand,the oxyphosphate anion of DNA can be neutralized by CX8 partally,which induced the contraction of DNA and the conformational change of DNA,which led to release NR from NDA partially.On the other hand,the CX8 can also compete the electrostatic sites with NR directly.
