1.Ensemble Partial Least Squares Algorithm Based on Variable Clustering for Quantitative Infrared Spectrometric Analysis
Yiming BI ; Guohai CHU ; Jizhong WU ; Kailong YUAN ; Jian WU ; Fu LIAO ; Jun XIA ; Guangxin ZHANG ; Guojun ZHOU
Chinese Journal of Analytical Chemistry 2015;(7):1086-1091
Due to the ability of overcoming both the dimensionality and the collinear problems of the spectral data, partial least squares ( PLS ) is in ever increasingly used for quantitative spectrometric analysis, especially for near-infrared spectrum, mid-infrared spectrum and Raman spectrum. In this work, an improved PLS algorithm is proposed for efficient information extraction and noise reduction. The spectral variables are clustering to several subsets, and several sub-models are built for each subset. Then, the sub-models are re-weighted and ensemble to the final model. Experiments on two near-infrared datasets ( octane number prediction in gasoline and nicotine prediction in tobacco leafs ) demonstrate that the new method provides superior prediction performance and outperformed the conventional PLS algorithm, and the root mean square error of prediction ( RMSEP) is reduced by 32% and 22%, respectively.
2.Hippocampal neuron-protective mechanism of hydrogen in a rat model of oxygen-glucose deprivation and restoration:promoting mitochondrial autophagy
Yongxing TAN ; Qinghua DONG ; Xinwei WU ; Yimeng HAO ; Guohai CHU ; Jie PENG ; Keliang XIE ; Yonghao YU
Chinese Journal of Anesthesiology 2019;39(10):1243-1247
Objective To evaluate the relationship between the hippocampal neuron-protective mechanism of hydrogen in a rat model of oxygen-glucose deprivation and restoration(OGD/R)and mito-chondrial autophagy.Methods Hippocampal neurons isolated from healthy Sprague-Dawley rats(24 h af-ter birth)were cultured in vitro,seeded in polylysine-coated 6-well plates at a density of 7×105 cells/well and then divided into 5 groups(n=30 each)using a random number table method: control group(C group),OGD/R group,OGD/R+H2 group,OGD/R plus 3-methyladenine(3-MA)group(OGD/R+3-MA group),and OGD/R plus H2 plus 3-MA group(OGD/R+H2+3-MA group).The cells were cultured for 24 h in normal culture atmosphere(75%N2-20%O2-5%CO2)in group C,and cells were subjected to oxygen-glucose deprivation for 2 h followed by O2-glucose supply for 24 h to establish the model of OGD/R injury in OGD/R,OGD/R+H2,OGD/R+3-MA and OGD/R+H2+3-MA groups.The cells were cultured for 24 h in a hydrogen-rich incubator(60%H2-10%O2-5%CO2-25%N2)after establishing the model in group OGD/R+H2.Autophagy inhibitor 3-MA 10 mmol/L was added,and then cultured for 24 h in normal culture atmosphere after establishing the model in group OGD/R+3-MA.Autophagy inhibitor 3-MA 10 mmol/L was added,and then cultured for 24 h in hydrogen-rich incubator after establishing the model in group OGD/R+H2+3-MA.The cell survival rate was measured using MTT assay.DCFH-DA fluorescent probe was applied for determination of reactive oxygen species(ROS)activity.The mitochondrial membrane potential was measured using a JC-10 assay kit.The neuronal apoptosis was detected by flow cytometry,and apoptosis rate was calculated.The expression of mitophagy-related protein microtubule-associated protein 1 light chain 3(LC3),PINK1 and Parkin was determined by Western blot,and LC3Ⅱ/LC3Ⅰ ratio was calculated.Results Compared with group C,the cell survival rate and MMP were significantly decreased,the apop-tosis rate and ROS activity were increased,and the expression of PINK1 and Parkin and LC3Ⅱ/LC3Ⅰrati-o were increased in OGD/R and OGD/R+H2 groups(P<0.05).Compared with group OGD/R,the cell survival rate and MMP were significantly increased,the apoptosis rate and ROS activity were decreased,and the expression of PINK1 and Parkin and LC3Ⅱ/LC3Ⅰ ratio were increased in group OGD/R+H2(P<0.05),and the cell survival rate and MMP were significantly decreased,the apoptosis rate and ROS activ-ity were increased,and the expression of PINK1 and Parkin and LC3Ⅱ/LC3Ⅰ ratio were decreased in group OGD/R+3-MA(P<0.05).Compared with group OGD/R+H2,the cell survival rate and MMP were significantly decreased,the apoptosis rate and ROS activity were increased,and the expression of PINK1 and Parkin and LC3Ⅱ/LC3Ⅰ ratio were decreased in OGD/R+3-MA and OGD/R+H2+3-MA groups(P<0.05).Conclusion Hippocampal neuron-protective mechanism of hydrogen against OGDR injury is relat-ed to promoting mitochondrial autophagy in rats.
3. Hippocampal neuron-protective mechanism of hydrogen in a rat model of oxygen-glucose deprivation and restoration: promoting mitochondrial autophagy
Yongxing TAN ; Qinghua DONG ; Xinwei WU ; Yimeng HAO ; Guohai CHU ; Jie PENG ; Keliang XIE ; Yonghao YU
Chinese Journal of Anesthesiology 2019;39(10):1243-1247
Objective:
To evaluate the relationship between the hippocampal neuron-protective mechanism of hydrogen in a rat model of oxygen-glucose deprivation and restoration (OGD/R) and mitochondrial autophagy.
Methods:
Hippocampal neurons isolated from healthy Sprague-Dawley rats (24 h after birth) were cultured