Objective To explore the relationship between life events,efficacy of self learning and learning burnout of Left-behind middle school Students.Methods 526 left-behind middle school students and 860 non -left-behind students were tested by means of scales of life events,academic self-efficacy and learning burnout.Results The degree of interpersonal relationship,learning pressure,health adaptation,life events,self-efficacy of learning ability,learning behaviors,and learning,sense of alienation between teacher and students,physiological depletion,and learning burnout of left-behind middle school students were lower than non left-behind students,and were statistically significant.The interpersonal relationship(r=0.270,P＜0.001),learning pressure(r=0.289,P＜ 0.001),being punished(r=0.242,P＜0.001),health adaptation(r=0.301,P＜0.001) and others (r=0.322,P＜ 0.001) were positively related to learning burnout.Self-efficacy of learning ability(r=-0.334,P＜0.01) and learning behaviors(r=-0.157,P＜0.001) were significantly and negatively related.Interpersonal relationship (r=-0.092,P＜0.05),learning pressure (r=-0.123,P＜0.01),being punished (r=-0.178,P＜0.001) and others (r=-0.254,P＜ 0.001) were negatively related to self-efficacy of learning ability.Being punished (r=-0.109,P＜ 0.05)and others(r=-0.209,P＜0.001) were significantly and negatively related to self-efficacy of learning behaviors.Self-efficacy,health adaptation,learning pressure,self-efficacy of learning behavior and others all entered the regression equation.Path analysis showed that there were five paths that have significant influences on learning burnout.Conclusion The levels of response to emergency of life events and enhance the academic self-efficacy of leftbehind students can be improved to reduce and prevent learning burnout.

Aim To investigate the effect of phenyle-thanol glycosides from Cistanche tubulosa(CPhGs) on the proliferation and activation of rrPDGF-BB induced HSC and their target points for resisting hepatic fibro-sis,to elucidate the molecular mechanism in molecular level, and provide basic data for the further develop-ment of new drugs. Methods HSCs were cultivated by CPhGs with different concentrations ( 0 , 3. 91 , 7. 81 , 15. 63 , 31. 25 , 62. 50 , 125. 00 , 250. 00 , and 500 mg ·L-1 ) and IC50 of CPhGs was determined. CPhGs with different concentrations ( 25 , 50 , 75 , 100 mg · L-1 ) were selected, and after the cells were stimulated with rrPDGF-BB, cell proliferation was determined by MTT. ERK1/2 ,α-SMA, c-fos, c-jun and Collagen I mRNA and Erk1/2 ,P-Erk1/2 and CollagenⅠprotein ex-pressions were assayed by RT-PCR and Western blot. Results CPhGs of ( 50 ~100 ) mg · L-1 concentra-tions groups could effectively inhibit rrPDGF-BB-medi-ated proliferation(P<0. 05) and CPhGs of(25~100) mg·L-1 concentrations groups had no significant cyto-toxicity( P >0. 05 ) . CPhGs of ( 25 ~100 ) mg · L-1 concentrations groups could inhibit ERK1/2 ,α-SMA,c-fos, c-jun and CollagenⅠmRNA levels, and also ob-viously inhibited Erk1/2 ,P-Erk1/2 and Collagen Ⅰ pro-tein expression on HSC. Conclusions CPhGs has the protective effect against hepatic fibrosis. The mecha-nism of this process may involve the interference with PDGF/ERK1/2 signaling pathway and inhibiting the activation and proliferation of HSC.

Objective To explore an approach to identifying the plant source of Flos Lonicerae and Lonicera confusa rapidly, precisely, and efficiently. Methods Using LM and SEM to observe and compare the characters of leaf epidermis of the five species of Lonicer L. including L. japonica, L. confuse, L. hypoglauca, L. dasystyla, and L. macrantha. Results There are obvious differences in leaf epidermis among the five species of Lonicera L. under LM and SEM. Conclusion The characteristics of leaf epidermis can be used to identify the plant source of Flos Lonicerae and L. confusa. According to their characteristics under LM and SEM, the retrieval keys to the five species of Lonicera L. have been compiled.

Objective To analyze the platelet activating factor acetylhydrolase ( PAF-AH) activity of a gene product encoded by LA2144 gene of Leptospira interrogans ( L. interrogans) , to investigate the ex-pression and secretion of LA2144 protein in various cell cultures and to further understand its function in in-ducing internal hemorrhage in an animal model. Methods The DNA sample containing LA2144 gene was extracted from L. interrogans serogroup Icterohaemorrhagiae serovar Lai strain Lai and used as the template for gene cloning by PCR. The LA2144 gene without the signal sequence coding region was amplified by PCR and inserted into a prokaryotic expression construct for the protein expression. The expressed recombinant protein, rLep-PAF-AH, was purified by Ni-NTA affinity chromatography. Spectrophotometry was used to measure the hydrolytic activity, hydrolytic efficiency, Km and Kcat values of the rLep-PAF-AH protein in hydrolyzing PAF substrate. Real-time fluorescent quantitative RT-PCR ( qRT-PCR) and Western blot assay were performed to measure the expression of LA2144 gene at mRNA and protein levels in human umbilical vein endothelial cells (HUVEC), human monocytes (THP-1) and murine macrophages (J774A. 1) with L. interrogans strain Lai infection, respectively. Each syrian hamster was intravenously injected with 100 μg of LPS-free rLep-PAF-AH for two times. Hemorrhage in the lungs, livers and kidneys were observed in three days after the injection. Results The constructed prokaryotic expression system for LA2144 gene of L. inter-rogans strain Lai could highly express the rLep-PAF-AH upon the induction of IPTG. The purified rLep-PAF-AH showed high purity with a single protein band in gel as indicated by SDS-PAGE. The efficiency of 5 μg of rLep-PAF-AH in hydrolyzing PAF substrate was 26. 6 U/L with a Km value of 82. 79 μmol/L and a Kcat value of 0. 24 S-1 . The expression of Lep-PAF-AH at mRNA level in HUVEC, THP-1 and J774A. 1 cells were significantly elevated after co-culture with L. interrogans strain Lai for 1 or 2 hours (P<0. 05). A large amount of Lep-PAF-AH were detected in the supernatants from co-cultures of L. interrogans strain Lai with the three cell lines, but not from the culture of the spirochete in EMJH medium. The signs of hemor-rhage were observed in the lung of hamsters injected with rLep-PAF-AH, but not in tissue samples from liver and kidney. Conclusion The LA2144 gene product was characterized by a stronger PAF-AH activity. The expression of LA2144 gene at mRNA and protein levels in various cell lines were enhanced during L. interro-gans infection. Moreover, the rLep-PAF-AH could induce the pulmonary hemorrhage in hamsters. This stud-y indicated that the protein encoded by LA2144 gene was an important virulence factor causing hemorrhage in hosts during L. interrogans infection.

OBJECTIVE To study the anti-fibrotic effect of Cistanche phenylethanoid glycosides (CPhG) in bovine serum albumin (BSA)-induced liver fibrosis in rats and its possible mechanism METHODS Seventy-five SD rats were randomly divided into six groups:normal control(distilled water-treated),model(BSA-treated),positive drug〔BSA-treated+compound Biejiarangan tablets(BJRG) 0.6 g·kg-1〕,and BSA-treated+CPhG(0.125,0.25 and 0.5 g·kg-1)groups. There were thirteen rats in each BSA-treated+CPhG(0.125,0.25 and 0.5 g·kg-1)group and twelve rats in other groups. Subcutaneous injection and tail vein injection of BSA immunity were used to induce the rat liver fibrosis model. Meanwhile, different therapeutic drugs were ig adminstered to rats. After the experimental period,rats were fasted for 12 h prior to 10%chloral hydrate administration and immediately euthanized. The liver was weighed to calculate the liver index. Glutamic-pyruvic transaminase (GPT),glutamic-oxalactic transaminase (GOT),alkaline phosphatase(ALP),total protein(TP)and albumin(ALB)were evaluated by the Mind-Ray automatic biochemical analyzer. The density of hydroxyproline (HyP) in liver tissues was determined using a spectrophotometric method according to the kit′s instructions. Histopathological changes and expressions of typeⅠ and typeⅢcollagens in liver tissues were also determined by immunohisto?chemical staining. RESULTS Compared with the normal control group,collagen fibers of liver tissues in the model group extended their links and enveloped the entire lobule,causing lobular structural damage and the formation of pseudolobules. The liver index(P<0.05),GPT,GOT,ALP,TP and ALB serum levels(P<0.05),HyP content(P<0.01)were significantly increased,so was the expression of typeⅠcollagens and typeⅢcollagens(P<0.01)in the model group. Compared with model group,various doses (0.125,0.25 and 0.5 g · kg-1) of CPhG significantly reduced the BSA-induced elevation of the liver index;GPT,GOT,ALP,TP and ALB serum levels(P<0.05),and HyP content decreased(P<0.01);the morphology of the pathological tissue sections was close to that of the normal control group,and CPhG significantly reduced the expression of two types of collagens(P<0.01). CONCLUSION CPhG can significantly reduce the degree of BSA-induced liver fibrosis in rats. The mechanism may be associated with down-regulation of two types of collagens and suppression of the activation of hepatic stellate cells.

Objective To evaluate the effect of propofol on mitochondrial fission in a rat hippocampal neuron model of hypoxia/reoxygenation (H/R) injury.Methods Primarily cultured hippocampal neurons of neonatal Sprague-Dawley rats were randomly divided into 4 groups (n =42 each) using a random number table:control group (group C);vehicle group (group V);H/R group;H/R+propofol group (group H/R+P).In group V,H/R was not produced,the vehicle dimethyl sulfoxide with the final concentration of 0.01％ was added,and the cells were then incubated for 6 h.In group H/R,the hippocampal neurons were subjected to oxygen-glucose deprivation for 6 h followed by 20 h reoxygenation.In group H/R+P,propofol with the final concentration of 1 μmol/L was added at 6 h of hypoxia.At 20 h of reoxygenation,the cell apoptosis (using flow cytometry),Ca2+ concentrations in cytoplasm (with the laser scanning confocal microscope),calcineurin (CaN) activities (by enzyme-linked immunosorbent assay),and expression of mitochondrial fission proteins dynamin-related protein 1 (Drp1) and fission 1 (Fis1),and apoptosis-related proteins cytochrome c (Cyt c) and apoptosis-inducing factor (AIF) (by Western blot) were measured.The apoptotic rate was calculated.Results Compared with group C,the apoptotic rate,Ca2+concentrations,CaN activities,and expression of Drp1,Fis1,Cyt c and AIF were significantly increased in H/R and H/R+P groups (P＜0.05),and no significant changes were found in the parameters mentioned a2+.bove in group V (P＞0.05).Compared with group H/R,the apoptotic rate,Ca+ concentrations,CaN activities,and expression of Drp1,Fis1,Cyt c and AIF were significantly decreased in group H/R+P (P＜0.05).Conclusion Propofol can reduce the H/R injury to rat hippocampal neurons through inhibiting mitochondrial fission.

Objective To evaluate the role of mitochondrial fission in anoxia-reoxygenation injury to rat hippocampal neurons.Methods Neurons were enzymatically isolated from hippocampi of newborn Sprague-Dawley rats (less than 24 h old).The primary hippocampal neurons were cultured and seeded in 25 mm × 25 mm culture flasks at a density of 7 × 105/ml.The cultured neurons were randomly assigned into 3 groups (n =18 each) using a random number table:control group (C group),anoxia-reoxygenation group (I/R group),and mitochondrial fission inhibitor mdivi-1 group (M group).In group I/R,the vehicle dimethyl sulfoxide (DMSO,final concentration ＜ 0.1％) was added prior to anoxia and the cells were then incubated for 40 min.In group M,mdivi-1 (dissolved in DMSO,final concentration of DMSO ＜ 0.1％) was added prior to anoxia and the cells were then incubated for 40 min.The hippocampal neurons were subjected to oxygen-glucose deprivation (OGD) for 6 h followed by restoration of O2 supply for 20 h.After 20 h of reoxygenation,the level of reactive oxygen species (ROS) (by ELISA),cell apoptosis (using flow cytometry),and expression of mitochondrial fission protein Drp1,Bcl-2 and Bax (by Western blot) were measured.The apoptosis rate and the ratio of Bcl-2 to Bax were calculated.Results Compared with C group,ROS content and apoptosis rate were significantly increased,the expression of Drp1 and Bax was up-regulated,the expression of Bcl-2 was down-regulated,and the ratio of Bcl-2 to Bax was decreased in I/R group (P ＜ 0.05).Compared with I/R group,ROS content and apoptosis rate were significantly decreased,the expression of Drp1 and Bax was down-regulated,the expression of Bcl-2 was up-regulated,and the ratio of Bcl-2 to Bax was increased in M group (P ＜ 0.05).Conclusion Mitochondrial fission is involved in anoxia-reoxygenation injury to rat hippocampal neurons via mitochondria-mediated apoptotic pathway.

ObjectiveTo investigate the association of gene mutations in the pre-C, C, and basic core promoter (BCP) regions of hepatitis B virus (HBV) with traditional Chinese medicine (TCM) syndrome types in patients with chronic hepatitis B (CHB). MethodsA retrospective analysis was performed for the clinical data of CHB patients who were diagnosed and treated at the outpatient service and ward of Spleen, Stomach, and Hepatobiliary Department, The First Affiliated Hospital of Henan University of Chinese Medicine, from November 2014 to June 2018. Related clinical data were collected and recorded, including general information, HBV serological markers, HBV gene mutations, and information obtained by four TCM diagnostic methods. Syndrome differentiation and typing were performed for each patient with reference to the criteria for TCM syndrome differentiation of viral hepatitis, and the association of gene mutation in the pre-C, C, and BCP regions of HBV with TCM syndrome types was analyzed. The chi-square test was used for comparison of categorical data between groups, and the Kruskal-Wallis H test was used for comparison of continuous data between multiple or two groups. ResultsA total of 235 patients with CHB were enrolled, among whom 101 had internal retention of damp-heat, 88 had stagnation of liver Qi and spleen deficiency, 17 had blood stasis obstructing the collaterals, 19 had liver-kidney Yin deficiency, and 10 had spleen-kidney Yang deficiency. There were significant differences in sex, age, and course of disease between the patients with different TCM syndrome types (χ2=17.389, H=173.280, H=86.520, all P＜0.01), and there was a significant difference in age between the CHB patients with gene mutations in the pre-C, C and BCP regions of HBV (H=30.150, P＜0.001). There was a significant difference in the distribution of TCM syndrome types between the CHB patients with gene mutations in the pre-C, C and BCP regions of HBV (χ2=58.117, P＜0.001), and internal retention of damp-heat and stagnation of liver Qi and spleen deficiency were major TCM syndrome types accounting for 80.43%. The patients with internal retention of damp-heat tended to have A1762T and G1764A mutations, and those with stagnation of liver Qi and spleen deficiency tended to have G1896A, A1762T, and G1764A mutations; G1764A mutation was often observed in the patients with blood stasis obstructing the collaterals or liver-kidney Yin deficiency, and I97L mutation was often observed in the patients with spleen-kidney Yang deficiency. ConclusionGene mutations in the pre-C, C, and BCP regions of HBV are associated with TCM syndrome types in CHB patients, and internal retention of damp-heat and stagnation of liver Qi and spleen deficiency are the most common TCM syndrome types. I97L mutation is often observed in patients with spleen-kidney Yang deficiency.

Objective: To study the relationship between compassion fatigue and overall happiness among firefighters, and the mediating role of psychological stress and positive psychological capital. Methods: A total of 894 firefighters in Shandong Province were selected as the research subjects using purposive sampling method. Questionnaires including the Professional Quality of Life Scale, the Military Psychological Stress Self-Assessment Scale, the Positive Psychological Capital Scale, and the Overall Happiness Scale were used for data collection. Results: The scores of compassion fatigue, psychological stress, positive psychological capital and overall happiness among firefighters were (40.1±13.5), (13.9±3.9), (133.0±26.4) and (84.9±15.2), respectively. There were correlations between compassion fatigue, psychological stress, positive psychological capital and overall happiness (all P<0.01). Psychological stress partially mediated the relationship between compassion fatigue and overall happiness, and the mediating effect accounted for 27.0% of the total effect. Positive psychological capital moderated the front half path and the direct path between compassion fatigue and overall happiness (all P<0.01). Conclusion: Compassion fatigue can directly or indirectly affect the firefighters' overall happiness. Psychological stress plays a partial mediating role and positive psychological capital plays a moderating role between compassion fatigue and overall happiness.

ObjectiveTo explore the mediating effect of personality traits between job stress and mental symptoms among firefighters. Methods A total of 974 firefighters in Shandong Province were selected as the research subjects using convenience sampling method. The Job Stress Scale, Brief Version of Chinese Big Five Personality Inventory and Symptom Checklist 90 were used to investigate their job stress, personality traits and mental symptoms. Results Job stress was found at a relatively high level in 39.7% of the firefighters, and 19.2% of the firefighters had high level of neurotic personality trait tendency. The positive detection rate of mental symptoms was 9.9% among firefighters. The score of job stress of the firefighters had a positive correlation with neuroticism and the score of mental symptoms (all P<0.01). The score of job stress and mental symptoms of the firefighters had a negative correlation with the personality traits score of extraversion, openness, agreeableness, and conscientiousness (all P<0.05). Neuroticism played a partially positive mediating effect between job stress and mental symptoms, and its mediating effect accounted for 39.6% of the total effect. Extraversion, agreeableness and conscientiousness played a partially negative mediating effect between work stress and mental symptoms, and the mediating effect accounted for 12.0%, 17.8% and 8.4% of the total effect respectively. There was no mediating effect of openness between job stress and mental symptoms. Conclusion Neurotic personality trait may enhance the negative effects of work stress on firefighters' mental health.