There are different views on the theory of “spleen governs time”， which is still a hot spot in the study of Zangxiang （藏象） theory. Based on Zangxiang time-space view， it is found that the thinking mode of the spleen governing time theory follows space-time logic. It is believed that the different time views of the spleen governing time are all formed based on the space view that the spleen belongs to earth and resides in the center， and the zang time theory is developed with the unified time and space logic. Guided by Zangxiang time-space view， the origin of the spleen belonging to earth and residing in the center is traced， and the theoretical connotation and its clinical application of spleen governing time under different time-space logic are explored with reference to the four season and five zang theory， five season and five zang theory， six season and six zang theory， and eight season and eight zang theory.

Objective The Kellinghaus grading method was used to manually read and grade the thin-layer CT of sternal end of clavicle,and a variety of traditional statistical methods as well as machine learning methods were used to construct age estimation models for adolescents and adults in early adulthood,to explore the value of the application of machine learning technology in the study of age estimation of the Han Chinese population in Sichuan.Methods Thin-section CT images of the chest were retrospectively collected from 491 individuals aged 10～30 years,and the collected samples were assigned a reading grade with reference to the Kellinghaus grading method.10%of the xases were randomly selected as the test set,and the remaining data were used as the training set to construct a variety of traditional statistical regression models and machine learning models for estimating the age of adolescents and adults in early adulthood,and the performance of the models was evaluated by using the mean absolute error(MAE).Results The statistical regression model with the best efficacy was the cubic regression model,with an MAE value of 1.34 for males and 1.57 for females;of the three machine learning models,the Random Forest model had the best predictive efficacy for males,with an MAE value of 1.39,and the Support Vector model had the best predictive efficacy for females,with an MAE value of 1.51.Conclusion In the construction of age estimation models for sternal end of clavicle,the machine learning model has a certain improvement in the accuracy of age prediction,but there is no obvious advantage compared with the traditional statistical regression model,and the use of the machine learning method in age estimation based on sternal end of clavicle still needs further exploration.

Acute ischemic stroke with large vessel occlusion (AIS-LVO) refers to ischemic stroke caused by large vessel occlusion of internal carotid artery, middle cerebral artery and vertebrobasilar artery, which has the characteristics of large infarct, relatively poor outcome, higher disability and mortality. Therefore, early vascular recanalization and rescue of ischemic penumbra are the key to improve the outcome of patients with AIS-LVO. Mechanical thrombectomy (MT) has a definite effect on AIS-LVO. The current guidelines recommend that MT should be performed on the basis of IVT for AIS-LVO patients without contraindications of intravenous thrombolysis (IVT), the so-called bridging therapy. IVT can increase the risk of bleeding to a certain extent, delay MT and increase the cost of hospitalization. However, there are still many controversies about whether the patients with AIS-LVO can directly perform MT. This article reviews the comparative study of direct MT and bridging therapy in patients with anterior circulation AIS-LVO, hoping to provide reference for clinicians in the treatment of AIS-LVO.

Objective:To Chinesize the Cardiac Exercise Self-Efficacy Instrument (CESEI) and evaluate its reliability and validity.Methods:A Chinese version of CESEI by translation, back translation and cultural adjustment. From January to February 2021, totally 176 inpatients in the Department of Cardiology from a ClassⅢ Grade A hospital in Shanghai were selected as the research subjects by convenient sampling and investigated with the Chinese version of CESEI to evaluate the reliability and validity of the instrument.Results:The Chinese version of CESEI included 16 items in 1 dimension. The analysis results revealed that the correlation coefficient between the items and the instrument's total score was 0.672-0.800. Validity analysis results showed that the content validity index of the instrument was 0.96, with a good structural validity. Reliability analysis results demonstrated that the retest correlation coefficient, split-half reliability, and Cronbach's α coefficient of the instrument was 0.855, 0.899, and 0.941.Conclusions:The Chinese version of CESEI has good reliability and validity and can be used to evaluate the self-efficacy of patients with cardiac exercise.

BACKGROUND: Decreased heart rate variability (HRV) is a predictor of autonomic system dysfunction, and is considered as a potential mechanism of increased risk of cardiovascular disease (CVD) induced by exposure to particulate matter less than 2.5 μm in diameter (PM METHODS: An updated systematic review and meta-analysis of panel studies till November 1, 2019 was conducted to evaluate the acute effect of exposure to ambient PM RESULTS: A total of 33 panel studies were included in our meta-analysis, with 16 studies conducted in North America, 12 studies in Asia, and 5 studies in Europe. The pooled results showed a 10 μg/m CONCLUSION Short-term exposure to PM
Adult ; Aged ; Aged, 80 and over ; Air Pollutants/analysis* ; Air Pollution/analysis* ; Female ; Heart Rate/drug effects* ; Humans ; Male ; Middle Aged ; Particulate Matter/analysis* ; Young Adult

Objective:To analyze the mediating effect of psychological capital (PsyCap) between occupational stress and suicidal ideation.Methods:In September 2017, stratified-cluster sampling method was adopted to select employees of an electronic manufacturing service industry as respondents for a questionnaire survey in Jiangsu province. The demographic characteristics of employees were collected. A total of 2 465 employees were investigated, and 2 216 valid questionnaires were collected. The level of occupational stress and PsyCap was assessed by the Effort-Reward Imbalance Scale(ERI)and PsyCap Questionnaire.Results:The age of 2 216 employees was (28.70±5.26) years old, including 1 230 males (55.5%). The scores of occupational stress on effort, reward and over-commitment were (3.08±0.63), (3.73±0.60) and (2.51±0.68), respectively. The average ERI index (ratio of effort to return) was (0.88±0.39). The total score of PsyCap was (86.62±15.23). The detection rate of suicidal ideation within two weeks was 13.9% (309/2 216). The average score of effort and over-commitment and the ERI index were positively correlated with the number of suicidal ideation detected within two weeks, with correlation coefficients about 0.081, 0.141 and 0.164, respectively. The average score of reward and total score of PsyCap were negatively correlated with the number of suicidal ideation detected within two weeks, with correlation coefficients about -0.206 and -0.228, respectively. The mediating effect results showed that PsyCap had mediating effect on the effort, reward, over-commitment and suicidal ideation of occupational stress respectively, with mediating effect values of -0.087 (95% CI: -0.018,-0.019), -0.299 (95% CI: -0.428,-0.200) and 0.096 (95% CI: 0.0394, -0.170). The mediating effect percentages were 9.43%, 17.92%, and 9.54%, respectively. Conclusion:PsyCap has a mediating effect between effort, reward, over-commitment of occupational stress and suicidal ideation.

Objective:To analyze the mediating effect of psychological capital (PsyCap) between occupational stress and suicidal ideation.Methods:In September 2017, stratified-cluster sampling method was adopted to select employees of an electronic manufacturing service industry as respondents for a questionnaire survey in Jiangsu province. The demographic characteristics of employees were collected. A total of 2 465 employees were investigated, and 2 216 valid questionnaires were collected. The level of occupational stress and PsyCap was assessed by the Effort-Reward Imbalance Scale(ERI)and PsyCap Questionnaire.Results:The age of 2 216 employees was (28.70±5.26) years old, including 1 230 males (55.5%). The scores of occupational stress on effort, reward and over-commitment were (3.08±0.63), (3.73±0.60) and (2.51±0.68), respectively. The average ERI index (ratio of effort to return) was (0.88±0.39). The total score of PsyCap was (86.62±15.23). The detection rate of suicidal ideation within two weeks was 13.9% (309/2 216). The average score of effort and over-commitment and the ERI index were positively correlated with the number of suicidal ideation detected within two weeks, with correlation coefficients about 0.081, 0.141 and 0.164, respectively. The average score of reward and total score of PsyCap were negatively correlated with the number of suicidal ideation detected within two weeks, with correlation coefficients about -0.206 and -0.228, respectively. The mediating effect results showed that PsyCap had mediating effect on the effort, reward, over-commitment and suicidal ideation of occupational stress respectively, with mediating effect values of -0.087 (95% CI: -0.018,-0.019), -0.299 (95% CI: -0.428,-0.200) and 0.096 (95% CI: 0.0394, -0.170). The mediating effect percentages were 9.43%, 17.92%, and 9.54%, respectively. Conclusion:PsyCap has a mediating effect between effort, reward, over-commitment of occupational stress and suicidal ideation.

No abstract available.
Dermatitis, Contact ; Hyperthermia, Induced

OBJECTIVE:To optimize the synthesis technology of 4-biphenylacetic acid,and to provide technology support to meet the market demand of 4-biphenylacetic acid raw material. METHODS:The synthesis route of 4-biphenylacetic acid from biphenyl by Friedel-Crafts reaction,ketal reaction,rearrangement reaction and hydrolysis was optimized and improved. The effects of different Friedel-Crafts reaction solvents (petroleum ether,dichloromethane,1,2-dichloroethane),ketal reaction ethanol (ethanediol, 1,3-propanediol, dimethyltrimethylene glycol, pentaerythritol), rearrangement reaction catalyzer (zinc biphenyl acetate,zinc oxide,zinc caprylate,zinc acetate) and refined solvent (isopropanol,95% isopropanol,ethanol,acetone,ethyl acetate) on synthesis technology were investigated. The optimal synthesis technology was screened with the purity and yield of intermediate or 4-biphenylacetic acid. RESULTS:The petroleum ether as Friedel-Crafts reaction solvent,ethylene glycol as ketal reaction ethanol,zinc diphenylacetate as rearrangement catalyst and 95% isopropanol as refining solvent were used for the preparation to obtain better effects. The yield of key intermediate 2′-chloroacetophenone reached above 95%. The purity of refined 4-biphenylacetic acid reached 99.9%;the content of single impurity was less than 0.1%;the total yield reached over 70%. CONCLUSIONS:The optimal synthesis technology of 4-biphenylacetic acid has the advantages of simple operation,mild and controllable reaction conditions,low cost,greener reagents and higher safety,and is suitable for industrial production. The purity and yield of the products are in high level and in line with the standards of European Pharmacopoeia and the Japanese Pharmacopoeia.

OBJECTIVE:To improve the synthesis technology of sodium picosulfate. METHODS:The synthesis technology of sodium picosulfate was improved by changing reaction solvent,charging sequence,refined method and formation of crystal water. Using phenol as raw material,it was condensed with 2-pyridinecarboxaldehyde to achieve 4,4′-(pyridin-2-ylmethylene)diphenol, and its yield rate was investigated. Sodium picosulfate was obtained after esterification,salification,formation of crystal water, and then its purity was determined. RESULTS:The yield rate of key intermediate 4,4′-(pyridin-2-ylmethylene) diphenol reached above 88%,and the purity of refined products reached over 99.5%. Sodium picosulfate monohydrate was stable,and the content of single impurity was less than 0.1%. CONCLUSIONS:The improved technology is simple with mild conditions,and suitable for large-scale production.