As the better disinfectant chlorine dioxide has been applied to disinfect water widely and it will be used more and more.But up to now,the health effect induced by chlorine dioxide and its disinfection by-products has been suspected.The formation,toxicity and control methods of the chlorine dioxide water disinfection by-products are introduced in this paper.In general,chlorine dioxide is becoming an acceptable water disinfectant with its research progress.

Objective To construct an Lentiviral expression vector of pLVX‐IRES‐ZsGreen1‐MIA2 targeting to MIA2 and in‐vestigate its effect on the expression of MIA2 and growth of HCC cell line HepG2 in vitro ,observe MIA2 changes and the influence on apotheosis ,thus to provide preliminary experimental fundament for successive researching on the role of MIA2 in the pathogene‐sis of HCC .Methods The sequence of pLVX‐IRES‐ZsGreen1‐MIA2 was designed and synthesized .The pLVX‐IRES‐ZsGreen1‐MIA2 Lentiviral expression vector was constructed and then transiently transfected into HepG2 HCC cells in vitro .The proportion of pLVX‐IRES‐ZsGreen1‐MIA2 positive cells was observed under the fluorescence microscope .Then ,the expression level of MIA2 was detected by real time PCR .Moreover ,the proliferation of HepG2 cells was observed by MTT assay and colony formation as‐say .Finally ,the migration of HepG2 cells in vitro was also determined by Scratch assay .Results pLVX‐IRES‐ZsGreen1‐MIA2 Lentiviral expression vector was successfully constructed .Compared with control group (NC) ,the expression level of MIA2 was significantly decreased in transfected groups(P<0 .05);MTT assay showed that the proliferation of HepG2 cells was dramatically reduced in pIRES2‐ZsGreen1‐MIA2transfected groups(P< 0 .05);furthermore ,the number of both colony forming and migrating cells were also remarkably reduced in transfected groups(P<0 .05) .Conclusion The pIRES2‐ZsGreen1‐MIA2 can significantly re‐duce the expression level of MIA2 and inhibit the proliferation and migration of the HepG2 HCC cells in vitro .

Objective To compare differential diagnostic value of narrow-band imaging (NBI) magnifying endoscopy and magnifying chromoendoscopy.Methods A total of 92 lesions from 75 patients were examined with conventional colonoscopy,NBI magnifying endoscopy and magnifying chromoendoscopy to evaluate pit patterns and vascular morphology patterns.Endoscopic findings were compared with the pathological results.Results The detection rate of conventional endoscopy,NBI magnifying endoscopy and magnifying chromoendoscopy were 94.6％ (87/92),97.8％ (90/92) and 100.0％ (92/92),respectively.NBI magnifying endoscopy was superior to the magnifying chromoendoscopy (P =0.000) in the the lesion contour and microvessels pattern detection,but there was no difference in the pit patterns detected with the two techniques (P =0.394).Consistency,sensitivity,and specificity of NBI magnifying endoscopy in diagnosis of colorectal neoplastic lesions were 91.3％ (84/92),83.9％ (26/31),95.1％ (58/61),respectively,while these variables of magnifying chromoendoscopy were 89.1％ (82/92),80.6％ (25/31),93.4％(57/61),which were not statistically significant (P ＞ 0.05).Conclusion Differential diagnostic value of NBI magnifying endoscopy and magnifying chromoendoscopy for colorectal neoplastic and non-neoplastic lesions was similar,but NBI magnifying endoscopy displays the lesion contours and microvessels clearlier,and is easy to manipulate.

Objective To analyze the risk factors of mortality in hospitalized patients with peptic ulcer bleeding (PUB).Methods From January 2003 to December 2012,1 210 patients with PUB were collected.Among them,1 170 patients were cured (cured group) and 40 patients died (dead group).The general information and clinical data of patients were collected,which included gender,age,smoking history,non-steroidal anti-inflammatory drugs intake,haematemesis,shock,blood infusion and rebleeding.The information of patients combined with other diseases was also collected.The lab findings and gastroendoscopy findings were also collected,including hemoglobin,platelets,serum albumin,blood urea nitrogen,serum creatinine levels,coagulation,location of ulcer and Forrest classification.Chi-square test was performed for comparison between groups of count data.The t-test was used for comparison between groups of measurement data and normally distributed,and Mann-Whitney rank sum test was used for non-normal distribution.The risk factors of mortality of patients with PUB were analyzed by univariate and multivariate Logistic regression analysis.Results The rates of age over 65,combined with other diseases,shock,rebleeding,abnormal coagulation,Forrest classification above Ⅱ b,medicine spraying to stop bleeding under gastroendoscope,gastroendoscopic hemostasis with titanium clip and operation of dead group (57.5％,23/40; 27.5％,11/40; 25.0％,10/40; 42.5％,17/40; 25.0％,10/40; 35.0％,14/40; 15.0％,6/40; 12.5％,5/40 and 17.5％,7/40) were all higher than those of cured group (25.0％,293/1 170; 7.4％,86/1 170; 12.5％,146/1 170; 13.1％,153/1 170; 5.1％,60/1 170; 20.9％,244/1 170; 4.8％,56/1 170; 4.1％,48/1 170 and 6.5％,76/1 170).The differences were statistically significant (x2 =21.117,18.651,5.400,27.728,9.203,4.613,6.332,4.661 and 5.710,all P＜0.05).The serum albumin level of dead group ((28.71±7.13) g/L) was lower than that of cured group ((32.82±7.55) g/L) and the difference was statistically significant (t=2.215,P＜0.05).Between the groups,there were no significant differences in gender distribution,rate of patients smoking,rate of patients taking non-steroidal anti-inflammatory drugs,rate of patients with haematemesis,volume of blood infusion,location of ulcer,dosage of proton pump inhibitor (PPI),average hemoglobin level,blood urea nitrogen level,serum creatinine and platelet count (all P＞0.01).Age over 65,combined with other diseases and rebleeding were the independent risk factors of mortality of patients with PUB during hospitalization (OR=4.821,12.959 and9.627,all P＜0.01).Conclusion Age over 65,combined with other diseases and rebleeding are the independent risk factors of mortality of patients with PUB during hospitalization.

Objective To analyze the risk factors of esophageal and gastric variceal bleeding (EGVB) in patients with cirrhosis.Methods A retrospective study was conducted in 638 hospitalized patients with cirrhosis from 2002 to 2009,who were divided into study group as having EGVB (n =286) and control group as not having EGVB (n =352).Differences between 2 groups were analyzed with univariate analysis and multivariate logistic regression.Results Child-pugh classification,serum albumin,prothrombin time,portal vein diameter and spleen thickness were significantly different between 2 groups (P ＜ 0.05).Univariate analysis showed that serum albumin(OR =0.944,P =0.000),prothrombin time (OR =1.067,P =0.007),portal vein diameter (OR =3.423,P =0.007) and spleen thickness (OR =1.276,P =0.007) were correlated with EGVB.Multivariate logistic regression analysis showed that serum albumin (OR =0.936,P =0.000),portal vein diameter (OR =4.098,P =0.013) and spleen thickness (OR =1.275,P =0.000) were independent risk factors for EGVB in patients with cirrhosis.Conclusion Low serum albumin level,increased portal vein diameter and spleen thickness are the risk factors for EGVB in patients with cirrhosis,which can be important predictors.To some extent,increasing serum albumin might reduce the risk of EGVB.

BACKGROUND: How to effectively and rapidly induce the osteogenic differentiation of human umbilical cord mesenchymal stem cells is the focus of the current stem cell research. Increasing evidence has demonstrated some growth factors, such as bone morphogenetic protein-2, have important effects on the transdifferentiation of umbilical cord mesenchymal stem cels into osteoblasts in vitro. However, widespread use of growth factors is limited because of high cost. Insulin is widely used in the cell culture and induction, but there is no report about the effect of insulin on the osteogenic differentiation of human umbilical cord mesenchymal stem cells. OBJECTIVE:To observe the effect of insulin on osteogenic differentiation of human umbilical cord mesenchymal stem cels and to explore the feasibility of human umbilical cord mesenchymal stem cell transplantation in the treatment of diabetic delayed fracture healing. METHODS:The passage 3 human umbilical cord mesenchymal stem cells were inoculated in two flasks, denoted as experimental group and control group. The insulin (10-7mmol/L) was added to the experimental group but not to the control group. The proliferative capacity of human umbilical cord mesenchymal stem cels was evaluated by cell count kit-8 and alkaline phosphatase activity. The osteogenic differentiation capacity of human umbilical cord mesenchymal stem cells was evaluated by measuring the protein and mRNA expressions of type I colagen as well as osteocalcin mRNA level. RESULTS AND CONCLUSION: After 1-2 weeks of induction, compared with the control group, insulin could significantly increase the number of human umbilical cord mesenchymal stem cells in the experimental group, the activity of alkaline phosphatase and expressions of type I collagen osteocalcin mRNA (P< 0.05). These data indicate that insulin can promote the proliferation and osteogenic differentiation of human umbilical cord mesenchymal stem cells.

Objective To explore the risk factors for early rebleeding in patients with peptic ulcer bleeding (PUB) .Methods From June 2006 to May 2017 ,a total of 1210 hospitalized patients with PUB from The General Hospital of Ningxia Medical University were enrolled . Totally 1040 patients with bleeding stopped after the treatment were taken as the control group . And 170 patients with early rebleeding were as the rebleeding group .The clinical data of the patients in two groups were analyzed . Chi-square test ,t-test and multivariate factors analysis were performed for statistical analysis . Results Between control group and rebleeding group ,there were statistical significances in gender ,age ,place of residence , hematemesis , shock , volume of blood transfusion , anticoagulant use , combined diseases , hemoglobin level ,albumin level ,urea nitrogen ,neutrophil ratio ,platelet count ,ulcer location ,maximum ulcer diameter ,Forrest classification and endoscopic treatment (all P< 0 .05) .The rate of endoscopic hemostasis of rebleeding group (92 .56％ ,112/121) was lower than that of control group (98 .70％ ,228/231) , and the difference was statistically significant (χ2=13 .609 ,P=0 .001) .The result of multivariate logistic regression analysis showed that Forrest classification (odds ratio (OR)= 7 .735 , P< 0 .01) ,hemoglobin (OR=7 .332 ,P=0 .040) ,shock (OR=5 .245 , P<0 .01) and ulcer size (OR=2 .360 , P=0 .029) were independent risk factors for rebleeding in patients with PUB .The effect of Forrest classification better than hemoglobin ,hemoglobin better than shock and shock better than ulcer size in assessing the risk of rebleeding .Conclusions Forrest classification ,hemoglobin ,shock ,ulcer size are the risk factors for rebleeding in patients with PUB .Endoscopic hemostasis can reduce the risk of rebleeding .

Objective To evaluate the clinical efficacy of domestic sulfasalazine (SASP) combined with probiotics on the treatment of inflammatory bowel disease (IBD).Methods According to the search of Chinese periodical full-text database,PubMed and other Chinese databases as well as English databases,the cases of IBD treated with SASP combined with probiotics or metronidazole in China were collected and screened for randomized controlled trials (RCT).The results between combined group and control group were compared using odds ratio (OR) and 95％ Confidence Interval (CI) indicates.The evaluation indicator was the remission rate.According to the inclusion and exclusion criteria,the literature was selected,and data was extracted.Quality assessment of the included methodologies was performed,and RevMan 5.3 software was used for meta-analysis.Results 26 studies including a total of 2 403 patients were adopted in the present study.Among them,13 studies suggested that the remission rate of IBD in SASP combined with probiotics group was significantly improved compared with that in the SASP group alone (x2 =10.29,df =12,I2 =0％,P ＜0.05,the effect model OR =3.70,95％ CI as 2.62-5.21),demonstrating that the combined treatment was superior to monotherapy in IBD.10 studies suggested that the remission rate of ulcerative colitis (UC) in SASP combined with probiotics group was significantly improved compared with that in the SASP group alone (x2 =2.59,df =9,I2 =0％,P ＜ 0.05,the effect model OR =3.84,95％ CI as 2.52 -5.86),demonstrating that the combined treatment was superior in UC.The other 3 studies showed that the remission rate of UC with infection in SASP combined with probiotics group was significantly improved compared with that in SASP combined with metronidazole group (x2 =0.07,df =2,I2 =0％,P ＜ 0.05,the effect model x2 =4.77,95％ CI as 2.27-10.02),demonstrating that treatment of SASP combined with probiotics was superior in UC with infection.Conclusions SASP combined with probiotics can improve the effective response rate in the treatment of IBD.

Objective:To investigate the risk factors that affected pathological diagnosis upgrading after resection of colorectal adenoma.Methods:From January 2017 to December 2022, a total of 1 059 patients who underwent adenoma resection after pathologically diagnosed as adenoma by endoscopic forceps biopsy(EFB)were included in General Hospital of Ningxia Medical University. The patients were divided into the pathologically no difference group (1 003 cases) and the pathologically upgraded group (56 cases) based on the comparison of pathological diagnosis of EFB specimens and the specimens after adenoma resection. Clinical information and endoscopic characteristics of the adenoma were compared between the 2 groups. The clinical information included smoking history, family history of colorectal cancer, and the endoscopic characteristics included maximum diameter, morphological characteristics, surface depression, erosion or ulceration, and surface color of adenoma. Chi-square test and Fisher′s exact test were used for statistical analysis. Multivariate logistic regression model was used to analyze the risk factors for pathological diagnosis upgrading after adenoma resection.Results:The proportions of patients with smoking history, family history of colorectal cancer, concomitant hypertension, and coronary heart disease in the pathologically upgraded group were higher than those in the pathologically no difference group (46.43%, 26/56 vs.26.12%, 262/1 003; 8.93%, 5/56 vs.0.70%, 7/1 003; 46.43%, 26/56 vs.30.11%, 302/1 003; 21.43%, 12/56 vs.9.27%, 93/1 003), and the differences were statistically significant( χ2=11.05, Fisher′s exact test, χ2=6.61 and 8.78; all P<0.05). There were statistically significant differences between the pathologically no difference group and pathologically upgraded group in the maximum diameter (929 cases (92.62%) and 23 cases (41.07%) of < 20 mm, and 74 cases (7.38%) and 33 cases (58.93%) of ≥20 mm, respectively), morphological characteristics (220 cases (21.93%) and 28 cases (50.00%) with pedicle, and 783 cases (78.07%) and 28 cases (50.00%) without pedicle, respectively), surface color (347 cases (34.60%) and 3 cases (5.36%) of near normal mucosa, 613 cases (61.12%) and 50 cases (89.29%) of red surface color, and 43 cases (4.29%) and 3 cases (5.36%) of white surface color, respectively), erosion or ulceration (78 cases (7.78%) and 36 cases (64.29%) had erosion or ulceration, and 925 cases (92.22%) and 20 cases (35.71%) had no erosion or ulceration, respectively), and surface depression (6 cases (0.60%) and 8 cases (14.29%) of depression, and 997 cases (99.40%) and 48 cases (85.71%) of non depression, respectively) ( χ2=155.18, 23.30, 20.58 and 176.31, Fisher′s exact test; all P<0.001). The result of multivariate logistic regression analysis showed that surface depression ( OR=25.198, 95% confidence interval (95% CI) 5.812 to 109.246, P<0.001), erosion or ulceration( OR=9.913, 95% CI 4.652 to 21.124, P<0.001), red surface color ( OR=4.276, 95% CI 1.053 to 17.363, P=0.042), white surface color ( OR=8.803, 95% CI 1.398 to 55.435, P=0.021), maximum diameter≥20 mm ( OR=4.689, 95% CI 2.265 to 9.706, P<0.001), family history of colorectal cancer ( OR=8.764, 95% CI 1.418 to 54.162, P=0.019) and smoking history ( OR=2.713, 95% CI 1.376 to 5.349, P=0.004) were independent risk factors for pathological diagnosis upgrading after adenoma resection. Conclusion:Surface depression, maximum diameter ≥20 mm, erosion or ulceration, white or red surface color, family history of colorectal cancer and smoking history may enhance the heterogeneity of adenomas, interfere with the accuracy of EFB pathology, and lead to an upgrade of pathological diagnosis after adenoma resection.

Objective:To explore the difference of methylation of circRNA related m6A in early inflammation of silicosis and to elucidate the underlying molecular mechanism of circRNA involved in the process of silicosis.Methods:The activation markers of macrophages were detected by Western blotting (WB) in THP-1-derived macrophages. The cell viability was detected with CCK8, by which the stimulation concentration and time of silica were determined. The methylation of total RNA was determined by colorimetry, and the expression of RNA m6A methylase, demethylase and reading protein were detected by Western blotting in mouse model of silicosis. The differential expression of m6A modified circRNA in lung tissues form silicosis and control mice was obtained through Arraystar m6A circRNA epigenetic transcriptome Chip and verified by RT-PCR.Results:The concentration of SiO 2 at 50 μg/cm 2 had the most significant effect on the activation markers and activity of macrophages. Compared with the control group, SiO 2 increased the total RNA m6A level of macrophages, and there were significant differences in the expression of methylase METTL3 and reading protein YTDHF3. High throughput sequencing analysis showed that compared with the control group, the methylation levels of 132 circRNA m6A in the lung of silicosis model mice were increased, while the methylation levels of 296 circRNA m6A were decreased, and then the target circSLC2A13 was screened based on the basic expression. Further verification showed that SiO 2 significantly increased the expression of circSLC2A13 and m6A modification in macrophages. Conclusion:The methylation of circRNA m6A is involved in the activation of macrophages in early inflammation of silicosis.