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Articles by Jiangang Wang
Total Records ( 2 ) for Jiangang Wang
  Yun Fu , Yu Zhang , Sufeng Zhou , Youxun Liu , Jiangang Wang , Yali Wang , Chengbiao Lu and Changzheng Li
  Ciprofloxacin is one of fluoroquuinones widely used as antibiotics in clinical treatments. It has been shown that the carboxyl group on position 3 of ciprofloxacin is essential for antimicrobial activity, however, the amide form on this position and its corresponding biological effects have not been studied. To determine the structure-activity relationship, the ciprofloxacin hydrazide derivative was synthesized and its antimicrobial and antitumor mechanism was also evaluated preliminarily. Our results demonstrated that the substitution of -OH of carboxyl on position 3 of ciprofloxacin with a -NH-NH2 group could slightly alter the antimicrobial spectra, but not significantly. The studies of the hydrazide derivative on cell cycle arrest, mitochondrial membrane permeability, topoisomerase inhibition, pro-apoptotic gene regulation and molecular docking revealed that the minor structural modification on position 3 of ciprofloxacin did not result in changes in molecular targets compared to ciprofloxacin.
  Qing Xiao , Jiangang Wang , Shaoqun Zeng and Qingming Luo
  We present a spectral interferometric method to measure the thickness of an optical plate or a film with a single layer. The system is based on the Michelson interferometer configuration, and the spectral interference signal of a broadband light source is recorded by a spectrometer. The optical path difference (OPD) between two interfering beams can be obtained by Fourier transform from the spectral interferogram. Gaussian fitting is used to find the exact peak of fringe to enhance the precision of the measurements. When the sample is inserted into the sample beam, the film’s thickness can be calculated by comparing the change of OPD, provided that the sample group refractive index is known. Only a single measurement is needed to determine a film’s thickness after the initial OPD of the system is calibrated. As no moving parts are required, the system has good stability. In particular, a large range of thicknesses, from micrometers up to several millimeters, can be measured. Such a large range is valuable for optical measurements. For demonstration, we measured the thicknesses of preservative film, cover glass and carrier glass, which were 9.6 ± 0.55, 156.1 ± 0.75, 1008.44 ± 0.96 μm, respectively.
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