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A selective and sensitive intramolecular charge transfer (ICT) fluorescent chemosensor was designed for Cu2+ in neutral aqueous solutions of pH 7.0. The design of this totally water-soluble fluorescent chemosensor was based on the binding motif of Cu2+ to aminoacid, which is coupled to an ICT fluorophore bearing a 1,3,4-thiodiazole moiety in the electron acceptor. The formation of a 1:1 complex of Cu2+ to 2 was suggested to lead to fluorescence quenching. The quenching obeyed Stern-Volmer theory in neutral aqueous solution of pH 7.0 for Cu2+ over 5.0 × 10−7 to 3.0 × 10−5 mol·L−1, with a quenching constant of 1.8 × 105 L·mol−1 and a detection limit of 2.0 × 10−7 mol·L−1. The binding of Cu2+ to 2 can be fully reversed by addition of chelator EDTA, affording a reversible sensing performance. [ABSTRACT FROM AUTHOR]

A series of Cr−Al intermetallic complexes, viz. [(Pz′3CH)2CrII2(μ-Cl)2]2+·2[(Me2XAl)(μ-Cl)(Me2XAl)]−(X = Me/Cl), Pz′3CHCrIIIMeCl(μ-Cl)(AlMe2X) (X = Me/Cl), and Pz′2CHCH2(μ-N)CH2(μ-Ph)CrIIICl(μ-Cl)AlMe2, have been isolated from the reactions of CrCl3(NNN) (NNN = tridentate pyrazolyl ligand) with neat AlMe3or commercial MAO solutions. The products generally show high activity and selectivity in ethylene trimerization. Crystallographic analysis has provided structural evidence for Cr(III) reduction by residual AlMe3in a mixture containing the “real” activator (MAO) as well as other transformations: viz., adduct formation, methylation, cationization, halide abstraction, N−H deprotonation, and C−H cleavage of an unactivated arene. [ABSTRACT FROM AUTHOR]

This study was to explore the expression and correlation between gene Xpert MTB / RIF, ADA, and TB-DNA in TB meningitis. For this purpose, we selected 102 patients in the TB meningitis progression diagnosed and treated in our hospital from January 2019 to December 2020, and another 100 patients in the non-TB meningitis group were selected for the control experiment. Two sets of CSF samples were taken to analyze the gene Xpert MTB / RIF positive rate and the correlation between the expression and the progression of tuberculous meningitis by testing the levels of ADA and TB-DNA in the patient body using an automatic biochemical analyzer. Research indicated that The levels of gene Xpert MTB / RIF, ADA, and TB-DNA in the non-tuberculous meningitis group were lower than those in the tuberculous meningitis group (P<0.05; Levels of gene Xpert MTB / RIF, ADA, and TB-DNA were higher (P<0.05) in patients with group III tuberculous meningitis compared with those under grades I-II tuberculous meningitis, and levels of gene Xpert MTB / RIF, ADA, and TB-DNA were higher (P<0.05) in patients with group VI tuberculous meningitis compared with group III tuberculous meningitis; Gene Xpert MTB / RIF, ADA, TB-DNA) as factors occurring in TB meningitis progression, and all three were associated (P<0.05) with TB meningitis progression; Gene Xpert MTB / RIF, ADA showed a positive correlation (r = 0.296, P = 0.002); Gene Xpert MTB / RIF, TB-DNA showed a positive correlation (r = 0.422, P = 0.001); ADA, TB-DNA showed a positive correlation (r = 0.366, P = 0.001). It was concluded that Gene X-Pert MTB / RIF, ADA, and TB-DNA showed high levels in TB meningitis progression, and as the disease worsened, all three showed a positive association in TB meningitis progression.