Liquid crystal tunable filters (LCTFs) are extensively used in hyperspectral imaging systems to obtain spectral information of target scenes. However, a typical LCTF can only filter linearly polarized light, greatly reducing the transmittance of the system and limiting its application in spectral and polarization imaging. In this paper, a spectropolarimeter using Mach–Zehnder structured LCTFs (MZ-LCTFs) combined with liquid crystal variable retarders (LCVRs) is proposed. The polarized beam splitter (PBS) can make full use of the two polarization components of the incident light to improve the transmittance of the system. Specifically, the results show that the mean pixel intensity (MPI) of spectral images is improved by 93.48% compared to a typical LCTF. Subsequently, the average signal to noise ratio (SNR) of filtered and unfiltered images when simultaneously using polarization S and P channels is increased by 2.59 dB compared to a single channel. In addition, the average Standard Deviations (STDs) of DoLP and DoCP are 0.016 and 0.018, respectively. The proposed method has the potential to be applied to obtain polarization information with high optical efficiency and a full spectrum in a wide band.
Summary
The purpose of the study was to explore the antibacterial effect and mechanism of a novel bacteriocin of Lactiplantibacillus plantarum (L. plantarum) against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The antibacterial activity was determined by the Oxford cup method, and the dynamic growth curves were conducted with continuous shaking incubation. The result showed that the bacteriocin was a protein or protein‐like antibacterial substance susceptible to pepsin and trypsin. And it had good antibacterial activity, pH stability, thermostability and enzyme treatment stability against E. coli and S. aureus. The SEM, flow cytometry and nucleic acid leakage showed that the bacteriocin disrupted the cell structures of the two bacteria by damaging cell walls and cell membranes. An agarose gel electrophoresis and SDS‐PAGE analysis showed that the bacteriocin inhibited DNA replication and interfered with the protein formation, which resulted in the inhibition of the two bacteria's growth. Therefore, the use of the L. plantarum bacteriocin might be a promising biocontrol strategy to inhibit the pollution of E. coli and S. aureus simultaneously in foods.
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