Objective Chlorination is often used to disinfect recreational water in large amusement parks;however,the health hazards of chlorination disinfection by-products(DBPs)to occupational populations are unknown.This study aimed to assess the exposure status of chlorinated DBPs in recreational water and the health risks to employees of large amusement parks. Methods Exposure parameters of employees of three large amusement parks in Shanghai were investigated using a questionnaire.Seven typical chlorinated DBPs in recreational water and spray samples were quantified by gas chromatography,and the health risks to amusement park employees exposed to chlorinated DBPs were evaluated according to the WHO's risk assessment framework. Results Trichloroacetic acid,dibromochloromethane,bromodichloromethane,and dichloroacetic acid were detected predominantly in recreational water.The carcinogenic and non-carcinogenic risks of the five DBPs did not exceed the risk thresholds.In addition,the carcinogenic and non-carcinogenic risks of mixed exposure to DBPs were within the acceptable risk limits. Conclusion Typical DBPs were widely detected in recreational water collected from three large amusement parks in Shanghai;however,the health risks of DBPs and their mixtures were within acceptable limits.

Objective To analyze the research status and trend of scarlet fever literature in China, and to provide reference for subsequent research. Methods Three major Chinese databases, CNKI, Wanfang, and VIP, as well as Web of Science English database, were used to search for literature related to scarlet fever from 2000 to 2023. Citespace6.2.R2 software was used to statistically analyze the number of publications, authors, institutions and journals, co-cited literature, keyword clustering, and other literature characteristics of the literature. Results From 2000 to 2023, a total of 1 011 Chinese literature were included in the three major Chinese databases. Since 2011, the number of publications had gradually increased, but in recent years, the number of publications had decreased. The organization with the most publications was the Shenyang Center for Disease Control and Prevention. The cluster analysis of key words mainly formed 9 cluster tags, and the high-frequency keywords mainly included epidemic characteristics, epidemiology, incidence rate, etc. A total of 84 English literature were included in the WOS database, with an overall upward trend in publication volume. The institution with the most publications was the China Center for Disease Control and Prevention, and the most frequently cited journal was ^“LANCET INFECT DIS^”.《Resurgence of scarlet fever in China: a 13-year population-based surveillance study》 was the most cited journal. After keyword cluster analysis, 9 cluster labels were mainly formed, and the keywords were mainly outbreak，Hong Kong, and Group A streptococcus. Conclusion Compared with the English literature, which mainly focuses on spatiotemporal aggregation, etiology and strain resistance, Chinese literature focuses more on epidemic surveillance, clinical features and quality nursing.

Objective To investigate the relationship between the changes in vasopressin(VP)level and disease severity and prognosis in patients with septic shock(SS).Methods A total of 96 patients with SS in the hospital from December 2021 to December 2022 were selected as the study group,and 95 healthy volun-teers in the hospital during the same period were selected as the control group.The plasma VP levels of the two groups were compared,and their correlation with multiple organ dysfunction syndrome(MODS)score,a-cute physiology and chronic health evaluation Ⅱ(APACHE Ⅱ)score,serum C-reactive protein(CRP),and procalcitonin(PCT)levels were analyzed.The study group received shock treatment,and was divided into a good prognosis group and a poor prognosis group based on the prognosis after 28 days of hospitalization.The clinical data of the two groups were compared.Multivariate Logistic regression analysis was used to analyze the factors affecting poor prognosis.A new prediction scheme and a conventional prediction scheme were con-structed,and the predictive efficacy of different prediction schemes was evaluated using area under the curve(AUC),net reclassification index and comprehensive discrimination improvement index.Results Compared with the control group,the plasma VP level in the study group was significantly decreased,and MODS score,APACHE Ⅱ score,the levels of serum CRP and PCT were significantly increased,with statistical significance(P＜0.05).Pearson correlation analysis showed that plasma VP level was negatively correlated with MODS score,APACHE Ⅱ score,serum CRP and PCT level(r=-0.426,-0.519,-0.483,-0.395,P＜0.05).The proportion of diabetes mellitus,acute respiratory distress syndrome(ARDS),acute kidney injury(AKI),MODS score,APACHE Ⅱ score,serum CRP and PCT levels in the poor prognosis group were higher than those in the good prognosis group,while the plasma VP level was lower than that in the good prognosis group,with statistical significance(P＜0.05).Logistic regression analysis showed that concurrent ARDS,concurrent AKI,plasma VP,MODS score,APACHE Ⅱ score,serum CRP and PCT were all influential factors for poor prognosis of SS patients(P＜0.05).The AUC of plasma VP predicting poor prognosis of SS patients was 0.752,and the AUC of the new prediction scheme predicting poor prognosis of SS patients was greater than that of the conventional prediction scheme predicting poor prognosis of SS patients(P＜0.05).Conclu-sion Plasma VP level decrease in SS patients and closely relate to the severity of the condition.Based on the results of Logistic regression analysis,the new predictive model is established,which has certain predictive value for poor prognosis.

Animals ; Mice ; Corticotropin-Releasing Hormone/metabolism* ; Neurons/metabolism* ; Brain/metabolism*

Medical Physics is an interdiscipline which is formed by applying the basic principles, methods, and techniques of physics to clinical medical research such as prevention, diagnosis, and treatment of human diseases, and it is a compulsory professional basic course for medical students. However, there are many medical students reflect that the content of this course is obscure and difficult to understand. Teaching effect is not ideal. The main reasons are that the teaching method is single and the reference materials are few. Based on the actual situation of the course, Hebei Medical University, China promotes formative evaluation from the content of teaching materials, teaching means, and other aspects. At the same time, by combining with the Internet, the digital construction has been realized, deepening the reform of the Medical Physics curriculum, and remarkable results have been achieved.

Objective:To investigate the relationship between tumor necrosis factor α (TNF-α) and pulmonary vascular remodeling in rats with chronic thromboembolic pulmonary hypertension (CTEPH).Methods:A total of 104 Wister rats were provided by Laboratory Animal Center, Harbin Medical University between January 2020 and June 2020 and included in this study. They were randomly divided into CTEPH group ( n = 52) and sham-operation group ( n = 52). Rats in the CTEPH group were injected with an embolus via the left external jugular vein to establish rat models of CTEPH. Rats in the sham-operation group were injected with the same amount of 0.9% sodium chloride injection. Relevant indicators were measured after 7 days and 1 month of embolization. Results:After embolization for 7 days and 1 month, plasma TNF-α level in the sham-operation group was (45.62 ± 1.65) ng/L and (46.24 ± 2.82) ng/L, respectively, which were significantly lower than those in the CTEPH group [(47.15 ± 1.58) ng/L, (48.85 ± 2.96) ng/L, t = 3.48, 3.31, both P < 0.05). Mean pulmonary artery pressure in the sham-operation group was significantly lower than that in the CTEPH group ( t = 1.89, 3.11, both P < 0.05). TNF-α mRNA expression in the sham-operation group was significantly lower than that in the CTEPH group ( t = 3.06, 3.36, both P < 0.05). The area/total area of pulmonary artery wall in the sham-operation group was significantly lower than that in the CTEPH group ( t = 1.73, 4.17, both P < 0.05). Plasma TNF-α level was positively correlated with pulmonary artery TNF-α mRNA expression ( r = 0.82, P < 0.05). Plasma TNF-α level and pulmonary artery TNF-α mRNA expression were positively correlated with mean pulmonary artery pressure ( r = 0.62, 0.73, both P < 0.05) and area/total area of pulmonary artery wall ( r = 0.61, 0.63, both P < 0.05). Conclusion:TNF-α may be involved in the pathogenesis of CTEPH by increasing pulmonary artery pressure and vascular remodeling.

Felids are the unique definitive host of Toxoplasma gondii. The intestine of felid is the only site for initiating Toxoplasma gondii sexual reproduction. T. gondii excretes millions of infectious oocysts from the intestine, which are the primary source of infection. There are many difficulties in developing vaccines and drugs to control oocyst excretion due to the lack of an appropriate experimental model. Here, we established an in vitro feline intestinal epithelial cell (IEC) infection system and an efficient animal model of T. gondii Chinese 1 genotype, Wh6 strain (TgCtwh6). The Kunming mice brain tissues containing TgCtwh6 cysts were harvested 42-day post-infection. The bradyzoites were co-cultured with cat IECs in vitro at a ratio of 1:10. Five 3-month-old domestic cats were orally inoculated with 600 cysts each. The oocysts were detected by daily observation of cat feces by microscopy and polymerase chain reaction. We found that the parasite adhered and invaded cat IECs in vitro, transformed into tachyzoites, and then divided to form rose-like structures. These parasites eventually destroyed host cells, escaped, and finished the asexual reproduction process. Schizonts associated with sexual reproduction have not been observed during development in vitro cultured cells. However, schizonts were detected in all infected cat intestinal epithelial cells, and oocysts were presented in all cat feces. Our study provides a feasible cell model and an efficient infection system for the following studies of T. gondii sexual reproduction, and also lays a foundation to develop drugs and vaccines for blocking excretion and transmission of oocysts.

Objective:To explore the influence of childhood psychological abuse, neglect and alexithymia on the boredom proneness of college students.Methods:The boredom proneness scale for college students(BPS), child psychological abuse and neglect scale (CPANS) and the Toronto alexithymia scale (TAS-20) were used to investigate 1 557 college students, and SPSS 22.0 was used for descriptive statistics, correlation analysis and regression analysis.Results:Childhood psychological abuse (26.540±8.985), neglect (32.665±10.651), recognition emotion in alexithymia dimension (19.359±4.835), description emotion dimension (14.173±3.001), extroverted thinking dimension in alexithymia (20.383±3.429) had positive correlation with the total score of boredom tendency (101.109±19.735) and the dimension of external stimulus (66.022±21.079)( r=0.160-0.559, all P<0.01). And there were negative correlations with the internal stimulus dimension (35.132±8.207)( r=-0.302--0.104, all P<0.01). The hierarchical regression analysis showed that after controlling the effects of gender and age, psychological abuse and neglect were the influencing factors of boredom proneness, internal stimulus and external stimulus, which explained 14.3%, 5.1% and 18.2% of the total variation (△ F=130.561, 41.968, 172.711, all P<0.01). Recognition of emotions, description of emotions and extroverted thinking in alexithymia were the influencing factors of boredom proneness, internal stimulus and external stimulus, which explained 17.5%, 9.9% and 25.5% of the total variation (△ F=134.274, 60.696, 234.383, all P<0.01). Conclusion:Childhood psychological abuse, neglect and alexithymia have significant effect on boredom proneness of college students, and mainly on external stimuli of boredom proneness. Among them, alexithymia has the greatest influence and the highest explanatory power.

ObjectiveTo investigate the role of hepatic stellate cell (HSC) inflammation in the pathogenesis of acute-on-chronic liver failure (ACLF). MethodsA total of 45 male Kunming mice were randomly divided into control group, model group, and N-acetylcysteine (NAC) group. The mice in the model group and the NAC group were given injection of human serum albumin to establish a model of chronic liver disease, followed by intraperitoneal injection of the endotoxins lipopolysaccharide (LPS) and D-galactosamine (D-GlaN) to induce ACLF, and those in the control group were given injection of an equal volume of normal saline; the mice in the NAC group were given NAC since 1 week before the induction of NAC. The mice in the model group and the NAC group were sacrificed at 48 hours after the injection of LPS and D-GlaN. ELISA was used to measure the serum levels of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) and the levels of malondialdehyde (MDA) and superoxide dismutase (SOD) in liver tissue; HE staining was used to determine liver pathological score; ELISA was used to measure the serum levels of LPS and interleukin-1β (IL-1β). LX2 cells were stimulated by LPS and H2O2 with the presence or absence of NAC, and ELISA was used to measure the levels of IL-1β and interleukin-6 (IL-6) in medium. LX2 cells were stimulated by LPS and H2O2, and then HL7702 cells were cultured with LX2 medium; Western blot was used to measure the expression of caspase-3 and caspase-8 in HL7702 cells, and flow cytometry was used to measure the apoptosis of HL7702 cells. A one-way analysis of variance was used for comparison of continuous data between multiple groups; the least significant difference t-test was used for comparison of data with homogeneity of variance between two groups, and the Tamhane’s T2 test was used for comparison of data with heterogeneity of variance. The Kaplan-Meier survival analysis was used to evaluate survival time, and the log-rank test was used for comparison. ResultsAt 48 hours, all mice in control group survived, while 3 mice in the model group and 8 mice in the NAC group survived, suggesting that the NAC group had a better survival rate of mice than the model group (P＜0.001). Compared with the control group and the NAC group, the model group had significant increases in the serum levels of AST and ALT and the level of MDA in liver tissue, as well as a significant reduction in the level of SOD in liver tissue (all P＜0.01). The model group had a significantly higher liver pathological score than the control group and the NAC group (both P＜0.05). Both LPS and H2O2 promoted the secretion of IL-1β and IL-6 in LX2 cells, and NAC effectively inhibited the pro-inflammatory effect of H2O2 and LPS (all P＜0.05). H2O2 and LPS acted on LX2 cells and promoted the apoptosis of HL7702 cells (all P＜0.05). ConclusionLPS can promote HSC inflammation via reactive oxygen species and participates in the progression of liver failure by inducing hepatocyte apoptosis.

Gut microbiota plays an important role in development of diabetes with frailty. Therefore, it is of great significance to study the structural and functional characteristics of gut microbiota in Chinese with frailty. Totally 30 middle-aged and the aged participants in communities with diabetes were enrolled in this study, and their feces were collected. At the same time, we developed a metagenome analysis to explore the different of the structural and functional characteristics between diabetes with frailty and diabetes without frailty. The results showed the alpha diversity of intestinal microbiota in diabetes with frailty was lower.
Aged ; Diabetes Mellitus ; Epstein-Barr Virus Infections ; Frailty ; Gastrointestinal Microbiome ; Herpesvirus 4, Human ; Humans ; Middle Aged