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1.
Chem Asian J ; 17(11): e202200263, 2022 Jun 01.
Article in English | MEDLINE | ID: mdl-35404509

ABSTRACT

A pair of enantiomeric ligands, (2R,3R)-dibenzyl-2,3-bis(isonicotinoyloxy)succinate ((R,R)-L) and (2S,3S)-dibenzyl-2,3-bis(isonicotinoyloxy)succinate ((S,S)-L), are designed and synthesized. Seven copper (II) coordination polymers {[Cu((R,R)-L)Br2 (THF)] ⋅ CH3 CN} n (1 a) and {[Cu((S,S)-L)Br2 (THF)] ⋅ CH3 CN}n (1 b), {[Cu((R,R)-L)Cl2 (THF)] ⋅ CH3 CN}n (2 a) and {[Cu((S,S)-L)Cl2 (THF)] ⋅ CH3 CN}n (2 b), {[Cu((R,R)-L)(NO3 )2 (CH3 CN)]}n (3 a) and {[Cu((S,S)-L)(NO3 )2 (CH3 CN)]}n (3 b), {[Cu((R,R)-L)2 (CH3 CN)2 ](ClO4 )2 ⋅ 3CH3 CN}n (4) were obtained through the assemblies with CuBr2 , CuCl2 ⋅ 2H2 O, Cu(NO3 )2 ⋅ 3H2 O, Cu(ClO4 )2 ⋅ 6H2 O, respectively. Single-crystal X-ray diffraction and circular dichroism analysis demonstrate that 1 a-3 a, 1 b-3 b have a mono chiral one-dimensional (1D) chain-like spiral structure, while 4 have 1D chain-like structure whose metal centers have chiral propeller coordination environment. Ligand structure, anions and solvent systems have a regulatory effect on the formation of chiral helical structure. Further investigation has proved that 1 a can be used as circular dichroism spectrum probe for monitoring L-/D-cysteine and L-/D-penicillamine configuration and concentration in aqueous media based on ligand interchange mechanism.


Subject(s)
Copper , Polymers , Copper/chemistry , Crystallography, X-Ray , Ligands , Polymers/chemistry , Succinates , Tartrates
2.
IEEE J Biomed Health Inform ; 22(5): 1373-1384, 2018 09.
Article in English | MEDLINE | ID: mdl-29990114

ABSTRACT

A brain-computer interface (BCI) is a communication approach that permits cerebral activity to control computers or external devices. Brain electrical activity recorded with electroencephalography (EEG) is most commonly used for BCI. Noise-assisted multivariate empirical mode decomposition (NA-MEMD) is a data-driven time-frequency analysis method that can be applied to nonlinear and nonstationary EEG signals for BCI data processing. However, because white Gaussian noise occupies a broad range of frequencies, some redundant components are introduced. To solve this leakage problem, in this study, we propose using a sinusoidal assisted signal that occupies the same frequency ranges as the original signals to improve MEMD performance. To verify the effectiveness of the proposed sinusoidal signal assisted MEMD (SA-MEMD) method, we compared the decomposition performances of MEMD, NA-MEMD, and the proposed SA-MEMD using synthetic signals and a real-world BCI dataset. The spectral decomposition results indicate that the proposed SA-MEMD can avoid the generation of redundant components and over decomposition, thus, substantially reduce the mode mixing and misalignment that occurs in MEMD and NA-MEMD. Moreover, using SA-MEMD as a signal preprocessing method instead of MEMD or NA-MEMD can significantly improve BCI classification accuracy and reduce calculation time, which indicates that SA-MEMD is a powerful spectral decomposition method for BCI.


Subject(s)
Brain-Computer Interfaces , Electroencephalography/methods , Signal Processing, Computer-Assisted , Adult , Algorithms , Brain/physiology , Female , Humans , Imagination/physiology , Multivariate Analysis
3.
Zhongguo Gu Shang ; 25(12): 1024-6, 2012 Dec.
Article in Chinese | MEDLINE | ID: mdl-23627151

ABSTRACT

OBJECTIVE: To investigate surgical methods and therapeutic effects of giant cell tumor of tendon sheath in finger. METHODS: From July 2002 to December 2010,70 patients with giant cell tumor of tendon sheath in finger which confirmed by operation and pathology,were retrospectively analyzed. There were 29 males,41 females with an average of 42 years (ranged, 16 to 61), and the course of disease ranged form 4 months to 6 years (mean 11 months). The method of surgery and anesthesia were observed. RESULTS: All wounds were got stage I healing,no necrosis occurred. Vascular crisis occurred in 6 cases (8.6%), inconformity of diagnosis in 18 cases (25.7%), changing of anesthesia due to situation of tumor in operation in 17 cases (24.3%). The patients were followed up from 2.2 to 10.5 years. Among them, 8 cases (11.4%) recurred, and diagnosied by the second operation without malignant change. CONCLUSION: The best anesthesia for giant cell tumor in finger should choose brachial plexus to fully expose,complete resection and less harmful damage; while the operation should complete resection at the stage I, and followed up actively, the second operation can be carried out for recorrenced.


Subject(s)
Fingers/surgery , Giant Cell Tumors/diagnosis , Giant Cell Tumors/surgery , Tendons/pathology , Adolescent , Adult , Female , Giant Cell Tumors/pathology , Humans , Male , Middle Aged , Tendons/surgery , Young Adult
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