A luminescent Zn(II)-Containing Complex: Selective Sensing of Cr(VI) Anion and Application Values on Tuberculosis Care Through Increasing the Antibacterial Response of Macrophages.

A new Zn(II)-bearing metal-organic framework (MOF), namely, {[Zn2(L)2(H2O)]·8H2O·DMF}n (1) has been generated via applying 4,4'-([2,3'-bipyridine]-4,6-diyl) dibenzoic acid (H2L), a pyridine-carboxylic acid ligand under the solvothermal reaction conditions. In the aqueous solution, complex 1 could be utilized as the fluorescent sensor for the simultaneous detection of Cr2O72- ion and CrO42- ion with low limits of detection and high sensitivity. It is important that this luminescent material can be regenerated quickly and the sensing ability of this luminescent material can be reused for three times. Furthermore, the assessment of the compound's application values against the Tuberculosis care was carried out and simultaneously its relevant mechanism was investigated. First of all, the bacterial burden in the lung macrophages was measured with plate micro-dilution method. Besides, the signaling pathway of JAK/STAT activation was evaluated with real time RT-PCR. Molecular docking simulation reveals that the polar oxygens are the active sites that could form binding interactions the protein.

Thickness measurement of colloidal opal crystal growth by Bragg reflection.

This study investigates a simple method for thickness estimation with single layer accuracy for self-assembling opal crystals prepared by the dip-coating method. The thickness (number of layers) of the opal crystals was estimated by an analysis of the optical reflectance from s-polarization incident light, and then verified with SEM. The opal crystals were considered as periodic dielectric layers and were analyzed with the transfer matrix method. The reflectance simulation showed a good agreement with the experimental results. The lattice constant and the thickness were determined at the peak position and by the fringes of the reflection spectra, respectively.