三种泪液评估方法在干眼诊断中相关性及一致性研究

目的:研究SchirmerⅠ试验(SⅠt)、泪河高度(TMH)、新一代泪液检测技术泪河试纸(SMTube)三种泪液评估方法在干眼诊断中的相关性及其评价泪液量的一致性。方法:采用诊断试验研究方法,选择2021-05/06期间按照就诊顺序,随机纳入就诊于河南省立眼科医院干眼门诊的干眼患者183例183眼(均纳入右眼)。均行SⅠt、TMH和SMTube检查,对测量结果的相关性和一致性进行分析。结果:纳入患者OSDI问卷得分为43.75(31.25,58.33)分,NIBUT为7.26(4.97,9.37)s,SⅠt测量结果为6(2,12)mm/5min,TMH测量结果为0.18(0.14,0.22)mm,SMTube测量结果为5(3,8)mm/5s;相关性分析结果:TMH与SMTube呈正相关(r_(s)=0.751,P<0.001),SⅠt与TMH(r_(s)=0.139,P=0.060)和SMTube(r_(s)=0.019,P=0.799)无相关性。一致性分析结果:TMH与SMTube评价泪液量的一致性好(Kappa=0.794,P=0.044),SⅠt与TMH(Kappa=0.271,P=0.074)和SMTube(Kappa=0.193,P=0.070)评价泪液量的一致性差。结论:SMTube是一种新型、简单、快捷评价泪液量的工具,与TMH测量结果的相关性和一致性好,在临床应用中可替代TMH测量但不能替代SⅠt。

Characteristics of AZ31 Mg alloy joint using automatic TIG welding

The automatic tungsten-inert gas welding（ATIGW） of AZ31 Mg alloys was performed using a six-axis robot. The evolution of the microstructure and texture of the AZ31 auto-welded joints was studied by optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction. The ATIGW process resulted in coarse recrystallized grains in the heat affected zone（HAZ） and epitaxial growth of columnar grains in the fusion zone（FZ）. Substantial changes of texture between the base material（BM） and the FZ were detected. The {0002} basal plane in the BM was largely parallel to the sheet rolling plane, whereas the c-axis of the crystal lattice in the FZ inclined approximately 25° with respect to the welding direction. The maximum pole density increased from 9.45 in the BM to 12.9 in the FZ. The microhardness distribution, tensile properties, and fracture features of the AZ31 auto-welded joints were also investigated.

Effects of different concentrations of tetramethylpyrazine,an active constituent of Chinese herb, on human corneal epithelial cell damaged by hydrogen peroxide

AIM: To discuss the effects of different concentrations of tetramethylpyrazine(TMP), an active constituent of Chinese herb, on damaged Shandong human corneal epithelial cell(SDHCEC) induced by hydrogen peroxide.METHODS: We detected the combined effects of TMP with concentrations ranging from 4 mg/m L to 0.03 mg/m L and 800 μM hydrogen peroxide on SDHCEC. The methyl thiazolyl tetrazolium(MTT) assay was processed at 3, 6and 12 h separately while the detection of cell apoptosis at 6h only by flow cytometry.RESULTS: The viability of SDHCEC with 0.5 mg/m L,0.25 mg/m L, 0.125 mg/m L and 0.06 mg/m L TMP joint with800 μM hydrogen peroxide at 3h and 6h was significantly higher than that with 800 μM hydrogen peroxide only, P 【0.05. However, except 0.25 mg/m L, TMP with other concentrations joint with 800 μM hydrogen peroxide at12 h could not significantly inhibit decreased SDHCEC viability induced by 800 μM hydrogen peroxide. At 12 h,TMP of 0.5 mg/m L, 0.25 mg/m L, 0.125 mg/m L and 0.06 mg/m L could significantly inhibit SDHCEC early apoptosis induced by 800 μM hydrogen peroxide, most remarkable at 0.25 mg/m L TMP, P 【0.05.CONCLUSION: Our results suggested that hydrogen peroxide can induce apoptosis related damage to SDHCEC. TMP can protect SDHCEC from the damage,and the protective effects may be associated with its anti-apoptosis mechanism.

Leptotrichia hongkongensis sp.nov.,a novel Leptotrichia species with the oral cavity as its natural reservoir

A straight, non-sporulating, Gram-variable bacillus (HKU24T) was recovered from the blood culture of a patient with metastatic breast carcinoma. After repeated subculturing in BACTEC Plus Anaerobic/F blood culture broth, HKU24T grew on brucella agar as non-hemolytic, pinpoint colonies after 96 h of incubation at 37 °C in an anaerobic environment and aerobic environment with 5% CO2. Growth was enhanced with a streak of Staphylococcus aureus. HKU24T was non-motile and catalase-negative, but positive for alkaline phosphatase, β-glucosidase, and α-glucosidase. It hydrolyzed phenylphosphonate and reduced resazurin. 16S rRNA, groEL, gyrB, recA, and rpoB sequencing showed that HKU24T occupies a distinct phylogenetic position among the Leptotrichia species, being most closely related to Leptotrichia trevisanii. Using HKU24T groEL, gyrB, recA, and rpoB gene-specific primers, fragments of these genes were amplified from one of 20 oral specimens. Based on phenotypic and genotypic characteristics, we propose a new species, Leptotrichia hongkongensis sp. nov., to describe this bacterium.

Super P and MoO_(2)/MoS_(2)co-doped gradient nanofiber membrane as multi-functional separator for lithium–sulfur batteries

Lithium-sulfur battery is one of the most promising battery systems for industrialization due to its high theoretical specific capacity and high energy density.Nonetheless,the"shuttle effect"has restrained the advancement of lithium-sulfur batteries.In this work,a gradient-structured nanofiber membrane with pure gelatin on one side and Super P-MoO_(2)/MoS_(2)-gelatin on the other side was created using a multi-step electrostatic spinning technique,which was applied for multi-functional separator for lithium-sulfur batteries.The pure gelatin layer facing the anode side primarily homogenizes the lithium flux,whereas the Super P-MoO_(2)/MoS_(2)-gelatin layer facing the cathode side primarily adsorbs polysulfides by physical and chemical adsorption and enhancing polysulfide conversion efficiency.The findings demonstrate that even after 150 cycles at 0.2C,the lithium-sulfur battery can still sustain a discharge-specific capacity of 572.3 mAh·g^(-1).When used with Li||Li symmetric batteries,it has a cycle life of more than 1200 h.The commercialization of lithium-sulfur batteries is given a fresh idea by this straightforward preparation technique.