Anti-Bacterial Agents ; pharmacology ; Bacterial Outer Membrane Proteins ; Bacterial Typing Techniques ; Electrophoresis, Gel, Pulsed-Field ; Microbial Sensitivity Tests ; Neisseria meningitidis, Serogroup B ; classification ; drug effects ; genetics ; Phylogeny

OBJECTIVETo study the incidence and risk factors of campus violence and to provide evidence for preventing campus violence among college students.

METHODS5300 college students in two universities in a province of China were selected to participate in the study and were interviewed with questionnaires. Logistic regression was used for data analysis.

RESULTS(1) In total, 3910 useable questionnaires were gathered to show a response rate of 73.77%. 17.98% of the college students reported they had ever experienced campus violence in the last one year. 29.60% of the male students experienced campus violence so as 7.27% of the female students. The incidence of violence among male students was significantly higher than those of female students (chi2 = 329.89, P = 0.000). (2) Among male students who were victims of campus violence, the incidence rates of threat or blackmail, emotional abuse, physical assault, verbal sexual harassment, sexual assault were 18.03%, 13.97%, 10.77%, 0.85%, 0.48% respectively. Among female students who were victims of campus violence, the incidence rates were 3.64%, 5.84%, 1.38%, 1.33%, 1.13% respectively. The main source of the violence was from their schoolmates. (3) 10.40% of the male students reported they were perpetrators of campus violence in the last year, while 1.47% of the female students reported so. Schoolmates were the main subjects of their aggressive behaviors. (4) Among the college students who were victims of campus violence, logistic regression analysis revealed that smoking, drinking alcohol, frequently getting computer online were important risk factors. The OR values were 1.48, 2.96, 1.66 respectively. Among college students who were perpetrators of campus violence, the OR values were 2.92, 1.88, 2.09 respectively.

CONCLUSIONCampus violence among college students was serious, suggesting that intervention measures should be taken.

China ; epidemiology ; Crime Victims ; statistics & numerical data ; Female ; Humans ; Incidence ; Interpersonal Relations ; Interviews as Topic ; Logistic Models ; Male ; Odds Ratio ; Peer Group ; Risk Factors ; Sex Factors ; Students ; psychology ; statistics & numerical data ; Surveys and Questionnaires ; Universities ; Violence ; statistics & numerical data

Adolescent ; Amino Acid Sequence ; Humans ; Male ; Meningitis, Meningococcal ; microbiology ; Microbial Sensitivity Tests ; Molecular Sequence Data ; Neisseria meningitidis ; classification ; drug effects ; isolation & purification

Objective:To investigate the interventional effect of metformin on pulmonary inflammation and pulmonary fibrosis in silicotic rats.Methods:In April 2019, 48 Wistar male rats of SPF grade were randomly divided into negative control group, metformin control group, silicon dioxide (SiO 2) model group, low, medium and high dose metformin intervention group according to the random number table method, 8 rats in each group. The SiO 2 model group and the low, medium and high dose metformin intervention groups were given 1 ml 50 mg/ml of SiO 2 by intratracheal instillation, the negative control group and the metformin control group were given 1 ml normal saline by intratracheal instillation. 24 hours later, the low, medium and high dose metformin intervention groups and the metformin control group were treated with 100, 200, 400 and 400 mg/kg metformin daily, the control and SiO 2 model groups received normal saline daily. Then the rats were sacrificed at the 28th day after SiO 2 exposure. The changes of rat body weight and pathological examination of rat lung tissue were observed, and the lung organ coefficient, the content of hydroxyproline (HYP) , the expression levels of inflammatory factors transforming growth factor beta1 (TGF-β1) , tumor necrosis factor-alpha (TNF-α) , interleukin-1beta (IL-1β) and the protein expression of E-cadherin (E-Cad) , Vimentin, α-SMA were detected. Results:Compared with the negative control group, SiO 2 model group had a significant decrease in the body weight of rats ( P<0.05) , lung organ coefficient, alveolitis and fibrosis scores, HYP content and the levels of TGF-β1, TNF-α, IL-1β were all significantly increased ( P<0.05) . Compared with the SiO 2 model group, the weights of the rats in the medium and high dose intervention group of metformin increased significantly ( P<0.05) . And after intervention with different doses of metformin, the lung organ coefficient, alveolitis and fibrosis scores, HYP content and the levels of TGF-β1, TNF-α and IL-1β were significantly decreased ( P<0.05) . Immunohistochemistry and Western blotting results showed that compared with the negative control group, the expression of E-Cad of the SiO 2 model group was decreased, and the expression levels of Vimentin and α-SMA were significantly increased ( P<0.05) . After metformin intervention, the expression of E-Cad was significantly increased, the expression levels of Vimentin and α-SMA were significantly decreased ( P<0.05) . Conclusion:Metformin can reduce lung tissue inflammation and fibrosis in rats exposed to SiO 2 dust, which may be related to reducing the expression of inflammatory factors in lung tissue and inhibiting the EMT process.

Objective:To investigate the interventional effect of metformin on pulmonary inflammation and pulmonary fibrosis in silicotic rats.Methods:In April 2019, 48 Wistar male rats of SPF grade were randomly divided into negative control group, metformin control group, silicon dioxide (SiO 2) model group, low, medium and high dose metformin intervention group according to the random number table method, 8 rats in each group. The SiO 2 model group and the low, medium and high dose metformin intervention groups were given 1 ml 50 mg/ml of SiO 2 by intratracheal instillation, the negative control group and the metformin control group were given 1 ml normal saline by intratracheal instillation. 24 hours later, the low, medium and high dose metformin intervention groups and the metformin control group were treated with 100, 200, 400 and 400 mg/kg metformin daily, the control and SiO 2 model groups received normal saline daily. Then the rats were sacrificed at the 28th day after SiO 2 exposure. The changes of rat body weight and pathological examination of rat lung tissue were observed, and the lung organ coefficient, the content of hydroxyproline (HYP) , the expression levels of inflammatory factors transforming growth factor beta1 (TGF-β1) , tumor necrosis factor-alpha (TNF-α) , interleukin-1beta (IL-1β) and the protein expression of E-cadherin (E-Cad) , Vimentin, α-SMA were detected. Results:Compared with the negative control group, SiO 2 model group had a significant decrease in the body weight of rats ( P<0.05) , lung organ coefficient, alveolitis and fibrosis scores, HYP content and the levels of TGF-β1, TNF-α, IL-1β were all significantly increased ( P<0.05) . Compared with the SiO 2 model group, the weights of the rats in the medium and high dose intervention group of metformin increased significantly ( P<0.05) . And after intervention with different doses of metformin, the lung organ coefficient, alveolitis and fibrosis scores, HYP content and the levels of TGF-β1, TNF-α and IL-1β were significantly decreased ( P<0.05) . Immunohistochemistry and Western blotting results showed that compared with the negative control group, the expression of E-Cad of the SiO 2 model group was decreased, and the expression levels of Vimentin and α-SMA were significantly increased ( P<0.05) . After metformin intervention, the expression of E-Cad was significantly increased, the expression levels of Vimentin and α-SMA were significantly decreased ( P<0.05) . Conclusion:Metformin can reduce lung tissue inflammation and fibrosis in rats exposed to SiO 2 dust, which may be related to reducing the expression of inflammatory factors in lung tissue and inhibiting the EMT process.