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Background Front-line power grid workers are required to face a variety of occupational hazards (such as aerial work), which make them susceptible to psychological problems and further reduce their performance efficiency and safety level. Objective To investigate the mental health status of front-line power grid workers and explore the influence of personality traits on mental health and the potential mediating role of work-family support between them. Methods This study was designed as a cross-sectional study. From January to June 2019, a cluster random sampling method was used to select two of the 20 power supply stations owned by a Guangdong power company. A total of 485 front-line power grid workers were included in the study. Sociodemographic characteristics were investigated, and NEO Five-Factor Inventory, Work-Family Support Scale, and Symptom Checklist 90 (SCL-90) were used in the survey. Spearman correlation analysis was conducted to analyze the correlations between measured variables. Structural equation modeling was used to analyze the relationships of personality traits, work-family support, and mental health, and Bootstrap analysis was used to test the mediating effect of work-family support on the relationship of personality traits and mental health. Results The M (P25, P75) of total SCL-90 score was 134.00 (110.00, 167.00）, and 139 (28.66%) front-line power grid workers showed positive mental health symptoms. The correlation analysis indicated that among the front-line power grid workers, neuroticism score was negatively correlated with work-family support total score (rs=−0.356, P<0.001), and positively correlated with the total score of SCL-90 (rs=0.557, P<0.001) as well as all the scores of its sub-dimensions (rs=0.436-0.550, P<0.001). Openness score was positively correlated with work-family support total score (rs=0.269, P<0.001), and except for paranoid ideation (P>0.05), openness score was negatively correlated with the scores of all the other sub-dimensions of SCL-90 (rs=−0.091-−0.147, P<0.05). The scores of the other three personality traits (extroversion, agreeableness, and conscientiousness) were positively correlated with work-family support total score (rs=0.331-0.466, P<0.001), and negatively correlated with the total score of SCL-90 as well as the scores of all its sub-dimensions (P<0.001). The modified structural equation modeling indicated that the direct effect of work-family support on mental health symptoms was −0.225 (P<0.001). The direct effects of extraversion and openness on work-family support were 0.241 (P<0.001) and 0.123 (P<0.05), respectively, while the effect on mental health symptoms was not statistically significant. The direct effects of neuroticism on work-family support and mental health symptoms were -0.152 (P<0.01) and 0.467 (P<0.001), respectively. The direct effects of conscientiousness on work-family support and mental health symptoms were not statistically significant (P>0.05). The direct effect of agreeableness on work-family support was not statistically significant (P>0.05), while the direct effect on mental health symptoms was −0.180 (P<0.001). Conclusion The front-line power grid workers show a high score of SCL-90. Workers with higher neuroticism are more vulnerable to mental health symptoms. Work-family support fully mediates the effects of extraversion and openness on mental health symptoms, and partially mediates the effects of neuroticism on mental health symptoms, while does not mediate the effects of agreeableness on mental health symptoms. Sufficient work-family support may improve mental health status.
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OBJECTIVE：To analyze the effects of mangiferin （MGF）on glucose and lipid metabolism in insulin resistance （IR）HepG2 cells，and to explore the potential mechanism. METHODS ：Using human hepatoma HepG 2 cells as research objects ， 1 mmol/L palmitic acid and 2 mmol/L oleic acid were used to establish the IR-HepG 2 cell model. Using metformin hydrochloride as positive control ，the effects of low-concentration ，medium-concentration and high-concentration MGF （125，250，500 μmol/L）on the corrected glucose consumption ，the contents of triglyceride （TG）and total cholesterol （TC）in IR-HepG 2 cells were detected. The mRNA expression of APN ，AdipoR2，APPL1，AMPK in the upstream of AMPK signaling pathway and IRS- 1，Akt and GLUT4 in the downstream insulin signaling pathway were detected by RT-PCR. The phosphorylation level of AMPK protein was detected by Western blot assay. RESULTS ：Compared with control group ，corrected glucose consumption ，mRNA expression of APN，AdipoR2，APPL1，AMPK，IRS-1 and GLUT 4，as well as the phosphorylation level of AMPK protein were decreased significantly in model group ，while the contents of TG and TC were increased significantly （P＜0.05 or P＜0.01）. Compared with model group ， corrected glucose consumption ， mRNA expression of APN （except for MGF medium-concentration and high-concentration groups ），AdipoR2，APPL1，AMPK（except for MGF medium-concentration and high-concentration groups ）， IRS-1（except for MGF medium-concentration and high-concentration groups ），Akt（except for positive control group ），GLUT4 （except for MGF high-concentration group ）were increased significantly in administration groups ，while the contents of TG and TC were decreased significantly （P＜0.05 or P＜0.01）. CONCLUSIONS ：Mangiferin may activate APN ，which is the upstream target of pathway ，and then regulate AMPK signaling pathway ，so as to promote glucose uptake of IR-HepG 2 cells，reduce TG and TC contents，and improve IR and abnormal glucose and lipid metabolism.
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@#To investigate the effect of serum amyloid A (SAA) on microglial migration and its mechanism,the migration ability of SAA-induced primary microglia and murine N9 microglia,and the effect of formyl peptide receptor 2 (FPR2) antagonist and TLR2 neutralizing antibody on SAA-induced migration of N9 microglia were all examined by Transwell assay. The expression changes of FPR2 and Toll-like receptor 2 (TLR2) in N9 microglia after SAA stimulation were detected by real-time PCR. The effect of SAA on the expression of downstream signaling pathway kinases in N9 microglia was detected by Western blot. The effect of signaling pathway inhibitors on SAA-induced N9 microglial migration was examined by Transwell assay. The results showed that SAA promoted the migration of primary microglia and N9 microglia in a concentration-dependent manner. FPR2 antagonist and TLR2 neutralizing antibody inhibited SAA-induced N9 cell migration. SAA promoted increased mRNA transcript levels of FPR2 and TLR2 in N9 microglia,and stimulated the activation of mitogen-activated protein kinases (MAPKs) and nuclear factor κB (NF-κB) signaling pathways in N9 microglia,as shown by increased extracellular regulated protein kinase (ERK),p38 and c-Jun N-terminal kinase (JNK) phosphorylation levels and decreased IκBα expression levels. Inhibitors of p38,JNK,and NF-κB signaling pathways inhibited SAA-induced migration of N9 microglia. The difference between the groups was statistically significant (P<0.05). These results indicate that SAA activates downstream p38,JNK,and NF-κB signaling pathways by acting on FPR2 and TLR2,thereby inducing microglia migration.
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Objective: To study the antipyretic, anti-inflammatory and analgesic effects of Yinhaojiere mixture and the antipyretic effect of Ilex asprella. Methods: The experiments of mice ear edma induced by xylene, the increase of capillary permeability by acetic acid and the sterilized cotton caused rat groin granulation tissue hyperplasia were used to study the anti-inflammatory effect of Yinhao-jiere mixture; the hot-plate tests and the acetic acid writhing test were applied to research the analgesic effect of Yinhaojiere mixture. In addition, the dry yeast induced fever in rats was employed to explore the efficacy of antipyretic agents in Yinhaojiere mixture and Ilex asprella water extract. Results: Yinhaojiere mixture could obviously inhibit the inflammation of the peritoneal cavity of mice ( P <0. 05). The inhibition of Yinhaojiere mixture against ear swelling induced by p-xylene was significant. Yinhaojiere mixture could sig-nificantly increase the pain threshold. Especially, Yinhaojiere mixture had significant antipyretic effect (P<0. 05). In the anti-inflam-matory, analgesic and antipyretic experimetns, there were no significant differences between the middle and high dose groups of Yinha-ojiere mixture and indomethacin group (P>0. 05). Conclusion: Yinhaojiere mixture with the Ilex asprella as the main ingredient has notable anti-inflammatory, analgesic and antipyretic effects, and Ilex asprella exhibits anti-inflammatory, analgesic effects, and its anti-pyretic effect is more significant.
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BACKGROUND:Transferrin (Tf) is one suitable ligand to be conjugated to drug delivery systems to achieve site-specific targeting and desired therapeutic effect, due to its specific binding to transferrin receptors (TfR), and high expression on the surface of tumor cells. Contrast agents are also modified with Tf to achieve specific tumor imaging. OBJECTIVE:To prepare Tf-labeled magnetoliposomes (MLs), and characterize their utility as TfR targeted MR specific contrast agent in vitro. METHODS:MLs and Tf-MLs were prepared by lipid film hydration method and covalent coupling method, respectively. Tf-MLs were characterized by their mean size, zeta potential, polyindex, r2 relaxivity, Tf-binding efficacy and cytotoxicity.In vitro MRI contrasting properties of the suspended nanoparticles incubated with HepG2 cells were determined. RESULTS AND CONCLUSION:The mean diameter, polydisperisity index, zeta potential and r2 relexivity of Tf-ML were 95.1 nm, 0.21,-1.25 mv and 94.62 mmol-1/s, respectively. The coupling efficiency was calculated and the values obtained were 59.4 μg Tf/μmol phospholipid corresponding to about 27 molecules of Tf-MLs. After a 2-hour incubation with rhodamine-labeled Tf-MLs, rhodamine fluorescence was detected intensively in the plasma membrane and the cytoplasm of the TfR-overexpressing HepG2 cells. In contrast, Tf-ML showed little binding in MCF-7 cells that had low TfR level. HepG2 cels incubated with Tf-ML showed much higher intracellualar iron density than incubated with non-targeted MLs.In vitro MR T2WI of cells demonstrated the centrifuge tube containing HepG2 cells incubated with Tf-MLs produced a lower visible signal intensity than that treated with non-targeted MLs. Tf-MLs showed their potentials such as high r2 relaxivity, specific binding ability characteristics. These results suggest the availability of Tf-MLs to serve as a targeted contrast agent.
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OBJECTIVE: To comprehend the prevalence status of elevated serum uric acid(SUA) and investigate the relationship between elevated SUA and cardiovascular risk factors and the clustering of the cardiovascular risk factors among outdoor male traffic policemen. METHODS: Selected by convenience sampling,1 039 outdoor traffic policemen in Guangzhou were asked to complete a questionnaire survey,physical and laboratory examination. According to the level of SUA > 420. 00 μmol/L or not,they were divided into elevated SUA group and control group. RESULTS: The median SUA level of outdoor male traffic policemen was 431. 00 μmol/L,and the elevated SUA prevalence was 56. 3%. The length of working years,systolic blood pressure,diastolic blood pressure,and levels of serum triglyceride(TG),total cholesterol(TC),low density lipoprotein cholesterol(LDL-C),and serum creatinine(Scr) in the elevated SUA group were statistically higher than the control group(P < 0. 01). The high density lipoprotein cholesterol level was lower in the control group than that in the elevated SUA group(P < 0. 01). After adjusting for age and alcohol consumption,the results of multivariate logistic regression analyses showed that outdoor traffic policemen who suffer from overweight or obesity,elevated TG and elevated TC have more risk in suffering from elevated SUA(P < 0. 05). The odds ratios(ORs) and 95%confidence intervals(CIs) were 2. 347(1. 772-3. 109),2. 040(1. 517-2. 743) and 1. 431(1. 080-1. 896) respectively.The risk factors of suffering from elevated SUA increased along with the increase of outdoor working years or Scr level(P <0. 05). The ORs and 95% CIs were 1. 028(1. 004-1. 054) and 1. 048(1. 033-1. 062) respectively. The proportion of people with elevated SUA among outdoor traffic policemen increased with the increase of cardiovascular risk factors(P <0. 01). The risk of elevated SUA among outdoor male traffic policemen who have 1,2,3,4 and ≥5 cardiovascular risk factors were 1. 583,2. 351,4. 657,2. 865 and 13. 576 times higher than those without cardiovascular risk factor respectively(P < 0. 05). CONCLUSION: Among outdoor male traffic policemen,elevated SUA are closely associated with the cardiovascular risk factors. The risk factors of suffering from elevated SUA increased with clustering of cardiovascular risk factors.
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Objective To provide references for reasonable procurement planning, TCM decoction pieces reserving and clinical medication guarantee by analyzing the usage of TCM decoction pieces and granules from 2011 to 2014 in Zhuhai Hospital of Guangdong Provincial Hospital of Traditional Chinese Medicine (hereinafter referred to as Zhuhai Hospital). Methods The sale data of TCM decoction pieces and granules during 2011-2014 in the database of Zhuhai Hospital were analyzed. Sales quantity, sales amount of the category and single pieces of TCM decoction pieces and granules ranking the first 10 were analyzed. Results The sales quantity and amount of TCM decoction pieces and granules were increasing from 2011 to 2014. The usage weight ratio and usage amount ratio between TCM decoction pieces and granules was stable. The top 10 categories and single pieces in sales quantity and amount were also stable. Conclusion Zhuhai Hospital has its own characteristics in TCM types, categories and dosage forms. TCM decoction pieces play an important part in clinical treatment in Zhuhai Hospital.
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Due to the subjective and objective constraints of universities in China,PBL Teaching Mode failed to gain its popularity in China's medical education.In its teaching reform,Guangzhou Medical University put forward a new teaching model--Web-based PBL Teaching Mode(hereinafter referred to as WPBL).by integrating the classical concept of PBL education with the real situation of the university and carried it out among students in bilingual classes of Clinical Medicine.The resuIts showed that by effectively overcoming the difficulties during the implementation of classical PBL teaching,Web-based PBL Teaching Mode not only succeeded in achieving the teaching objectives,but also improved the learning efficiency and utilization of teaching resources greatly by means of network technology.
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Objective This paper aims to use components as the key factors to explore the feasibility of evaluation method about the learning effect of Web-based PBL.Methods We distributed a questionnaire to 101 students of clinical class of 2007 and 2008 grade in Guangzhou Medical University,and electronically distributed after 2 weeks.Cranach's α coefficient WaS used to evaluate intrinsic consistency reliability of the questionnaire.We applied principal axis factoring to extract components and to explain components which were orthogonally rotated by varimax.Multi-factor regression model Was simulated with key factors and the model's performance of fitting WaS tested.Results Multi-factor regression mode(WPBLSUM)=0.545 Collective collaboration capabilities+0.202 Self-learning and quest skills+0.137 linical reasoning and problem-solving capabilities+0.116 memorizing and understanding of medical knowledge.The coefficient of determination R2Was 0.998 and the corrected coefficient of determination R2Was 0.998.indicating that the model's fit results are obvious.Conclusion This paper demonstrates that using components as the key factors to simulate and assessing the Web-based PBL learning effect is feasible,which assesses the Web-based PBL learning effect well from four different aspects.
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[Objective]To evaluate the prognostic value of skull-base invasion of nasopharyngeal carcinoma(NPC)based on magnetic resonance imaging(MRI).[Methods]A total of 924 patients who were diagnosed with NPC between 2003 and 2004,had undergone MRI scan and received mdiothempy as their primary treatment,and had no distant metastasis were included in this study.MRI images and medical records were analyzed retrospectively.All the 924 eases.patients who developed skull-base invasions based on MRI,315 patients with T3 disease and 227 patients with T2 disease were selected for analysis.The staging was according to the sixth edition of the American Joint Commission on Cancer(AJCC)staging system.[Results]Incidence of skullbase invasion according to MRI was 55.4%.Of 924 cases.skull-base invasion on MRI was not an independent prognostic factor for overall survival(OS)and distant metastasis-free survival(DMFS),but was a marginally significant independent prognostic factor for local relapse-free survival(LRFS),P=0.068.Grading of MRI-detected skull-base erosion according to the site of invasion was an independent prognostic factor for OS(P=0.002 and P=0.005)and DMFS(P=0.001 for both)in the 512 patients with skull-base invasions and 315 patients with T3 disease.Severe-grade of skull-base invasion on MRI was an independent prognostic factor for OS and DMFS in the 924 patients(P ＜ 0.001 for both).No significant differences were observed on OS,LRFS,and DMFS between T2a patients and T3 patients with low-grade of MRI-deteeted skull-base involvement.[Conclusions]Skull-base invasion based on MRI is not an independent prognostic factor for NPC.However,severe-grade of invasion according to the site of involvement has positive prognostic value.
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Objective To analyze the main causes of physical disability in adults in Guangdong province in China, and to provide prevention and treatment strategies. Methods Data on Guangdong from China's Second Na-tional Sample Survey on disability in 2006 were carefully collected. Physical disability was categorized according to different causes. In each category or group, multiple factors including the severity, distribution in urban or rural are-as, and the age of onset were analyzed with appropriate statistical methods. Prevention and treatment were then for-mulated based on the data. Results The severity of disability, distribution in rural and urban areas, and the age of onset were significantly different in different groups. The main cause was cerebral vascular diseases (16.7%). The incidence of physical disability was much higher in rural areas than that in urban areas (31.8% vs 68.2% ) except for brain trauma and toxication. The main cause for physical disability among young and middle-aged people was poly-myelitis (17.1% and 14.8% respectively) ; in old people it was osteoarthrosis (35.7%). Conclusions In order to lower the incidence of physical disability and to alleviate its severity, more work should be done in the prevention and treatment of cerebral vascular disease, spinal injury, cerebral palsy, polymyelitis and osteoarthrosis. In addition more financial and technical support is needed in rural areas.
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@#Objective To identify the differences in the status of rehabilitation demands of adults with different disability grades so as to seek out the beneficial strategies of rehabilitation for them.Methods The data on the rehabilitation demands of persons with different disability grades in every category of disabilities had been collected from the province of Guangdong in the Second National Sampling Survey of People with Disability.Results There were significant differences in the rehabilitation needs among persons with different disabilities grade in visual, hearing, physical, intelligence disabilities. There were no significant differences in the rehabilitation needs among persons with different disabilities grade in speech, mental disabilities.Conclusion The more severe disability the persons have the more medicine services they need，however，they little asked for other rehabilitation demands such as rehabilitation services, assistive device and so on.
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The intention of quitting smoking and its influencing factors were surveyed with questionnaire developed by Chinese Center for Disease Control in 734 smokers in Guangzhou City.The results showed that 57.6%of the interviewed smokers intended to quit smoking.Logistic regression analysis demonstrated that 5 factors were significantly associated with the quitting intention:the attitude against smoking of family,educational background,the cost of cigarettes,addiction to smoking,awareness of the harm of smoking to health.
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OBJECTIVE: To investigate the anti-tumor activity of adriamycin-loaded chitosan nanoparticles surface-modified with glycyrrhizin on human hepatoma cell line SMMC-7721. METHODS: Inhibition effect of drug-loaded nanoparticle on the proliferation of SMMC-7721 cells was determined with MTT method. Intra-cellular distribution of nanoparticles and morphological change of SMMC-7721 cells before and after treatment were observed by confocal laser scanning microscope (CLSM) and the apoptosis induced by adriamycin was measured by TUNEL assay. RESULTS: The inhibition effect of adriamycin-loaded chitosan nanoparticles surface-modified with glycyrrhizin on the proliferation of SMMC-7721 cells increased 6.36 times lower in comparison with free drugs. The inhibition effect of adriamycin-loaded chitosan nanoparticles had no obvious improvement. Nanoparticles surface-modified with glycyrrhizin promoted the distrubition of adriamycin in the nucleus, so as to promote the anti-tumor activity of adriamycin. TUNEL assay indicated that nanoparticles surface-modified with glycyrrhizin induce DNA fragmentation and nucleus breakdown to induce the apoptosis of SMMC-7721 cells. CONCLUSION: Adriamycin-loaded chitosan nanoparticles surface-modified with glycyrrhizin can used as potential active hepatocyte-targeted delivery carrier. Pharmacokinetic evaluation of it is worthy of further studing.
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Objective: To investigate six mineral element contents of rice bran and milled rice from three color rice cultivars (white rice, red rice, black rice). Methods: Select 36 typical cultivars and determine Se, Zn, Fe, Ca, Mn, Cu contents in their rice bran and milled rice with AFS-2201 atomic fluorescent spectrometer and AA-680 atomic absorption spectrometer. Results: 1. The six mineral element contents of rice bran were 2.58, 3.35, 10.04, 4.58, 12.79 and 6.59 times as those of milled rice respectively. 2. The Ca content of black milled rice was significantly higher than that of white and red milled rice. The Mn content in rice bran of white rice was significantly higher than those of black and red rice. Other mineral element contents were not significantly different. 3. For rice bran and milled rice of different cultivars, the contents of each mineral element in three color rices varied greatly. Conclusions: 1. The content of six minerals in rice bran was 5.66 times on average as that in milled rice in all cultivars of three color rice. 2. Eight cultivars of the highest content of each mineral in rice bran and milled rice were recommended for commercial use and human consumption.
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Based on the subject classification of biomedical engineering in military hospital,the development modes of the discipline are discussed in this paper.
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The anti-endotoxic effect of syringic acid (SA) isolated from Radix Isatidis (Banlangen, BLG) was studied. SA was extracted and isolated from BLG and diluted into 1% solution. The content of SA-pretreated endotoxin (ET) was quantitatively determined using Limulus test. The ability of fever induction of ET pretreated with SA was measured using endotoxin-induced fever test in rabbits. The LPS-induced death in mice pretreated with and without SA was compared. Results showed that after pretreatment with SA, 83.16% of ET was destroyed, the ET-induced fever in rabbits relieved markedly and the LPS-induced death rate in mice dropped from 68% to 20%. It was concluded that SA isolated from BLG had anti-endotoxic effects.
Subject(s)
Drugs, Chinese Herbal/pharmacology , Endotoxemia/blood , Endotoxins/antagonists & inhibitors , Escherichia coli , Gallic Acid/analogs & derivatives , Gallic Acid/pharmacology , Isatis/chemistry , Limulus Test , Plant Roots/chemistryABSTRACT
The anti-endotoxic effect of syringic acid (SA) isolated from Radix Isatidis (Banlangen, BLG) was studied. SA was extracted and isolated from BLG and diluted into 1% solution. The content of SA-pretreated endotoxin (ET) was quantitatively determined using Limulus test. The ability of fever induction of ET pretreated with SA was measured using endotoxin-induced fever test in rabbits. The LPS-induced death in mice pretreated with and without SA was compared. Results showed that after pretreatment with SA, 83.16% of ET was destroyed, the ET-induced fever in rabbits relieved markedly and the LPS-induced death rate in mice dropped from 68% to 20%. It was concluded that SA isolated from BLG had anti-endotoxic effects.
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Animals , Female , Male , Mice , Rabbits , Drugs, Chinese Herbal , Pharmacology , Endotoxemia , Blood , Endotoxins , Escherichia coli , Gallic Acid , Pharmacology , Isatis , Chemistry , Limulus Test , Plant Roots , ChemistryABSTRACT
<p><b>OBJECTIVE</b>To evaluate the effect of colonic J-pouch coloanal anastomosis after low anterior resection for mid or low rectal cancer on improving defecation and anorectal physiology.</p><p><b>METHODS</b>To make a meta-analysis, prospective randomized controlled trial of with or without colonic J-pouch after low anterior resection for mid or low rectal cancer was conducted. The key words included rectal cancer, J-pouch (or J-pouch) and those randomized from selected reports. The data on bowel function and physiological function of the anal canal and (neo) rectum were meta-analyzed using fixed effect model and random effect model.</p><p><b>RESULTS</b>Eight randomized trails including 378 patients entered this study. After one year follow-up, the functional results showed that there were significant differences in stool frequency per day, urgency and use of medication between colonic J-pouch group and straight coloanal anastomosis group. On physiological function of the anal canal and (neo) rectum, there was significant difference only in rectal compliance between the two groups. But there was no significant difference in other 4 items.</p><p><b>CONCLUSIONS</b>The functional improvement gained from colonic J-pouch coloanal anastomosis continues to benefit the patient with mid or low rectal cancer for at least 12 months. It is necessary to further study about the effect of colonic J-pouch coloanal anastomosis on physiological function of the anal canal and (neo) rectum.</p>
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Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Anal Canal , General Surgery , Anastomosis, Surgical , Methods , Colonic Pouches , Randomized Controlled Trials as Topic , Rectal Neoplasms , General Surgery , Rectum , General Surgery , Treatment OutcomeABSTRACT
Objective To observe the anti-pyretic effect of F022 from Radi x Isatidis.Methods The fever model was induced by intravenous injection of endo toxin into rabbits.Body temperature of the rabbits was measured at 0.5,1,2,3,an d 4h after administration in semi-vivo and in vivo.Results F022 subsided th e fever in rabbits induced by endotoxin in semi-vivo and vivo.Conclusion It is valuable for further research that F022 component is used as the main to scr een anti-pyretic active constituent.