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ObjectiveTo investigate and analyze the public health status of escape room-style venues in Yangpu District， Shanghai. MethodsReferring to the hygiene standards and testing methods for public places， an investigation of the current situation and environmental monitoring were conducted in 15 escape room-style venues in Yangpu District， which involved exploring the changes in physical， chemical， and microbial indicators before and after the game. ResultsThe hygiene condition of escape room-style venues in Yangpu District was generally good， with all 19 monitoring indicators not exceeding the indoor standards. The indoor carbon dioxide （CO2） and formaldehyde concentrations increased significantly after the game but did not exceed the standards. ConclusionThe hygiene condition of escape room-style venues in Yangpu District is good. However， potential public health risks were identified in four aspects： site selection and design， length of the game， cross-contamination， and training and management.
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Objective:To investigate the role of down-regulating serine racemase (SRR) in alleviating the β-amyloid peptide (Aβ) induced neurotoxicity and synaptic damage and possible mechanism in PC12 cells.Methods:(1) PC12 cells cultured in vitro were divided into 0, 20, 40 and 80 μmol/L Aβ 25-35 treatment groups; they were treated with 0, 20, 40 and 80 μmol/L Aβ 25-35 for 24 h, respectively; cell counting kit (CCK)-8 was used to detect the survival rate of cells in each group, and Western blotting was used to detect the SRR protein expression. PC12 cells were treated with 40 μmol/L Aβ 25-35 for 0, 12, 24 and 48 h, respectively; cell survival and SRR protein expression were detected by CCK-8 and Western blotting, respectively. (2) PC12 cells were divided into control group, nonsense sequence group, SRR small interfering RNA (siRNA) group 1, SRR siRNA group 2, and SRR siRNA group 3; cells in the later three groups were transfected with SRR nonsense sequence or different SRR siRNA sequences, respectively; 48 h after that, Western blotting was used to detect the SRR protein expression of cells in each group, and SRR siRNA with best effect was selected for subsequent experiments. (3) PC12 cells were divided into control group, AD group, AD+nonsense sequence group, and AD+SRR siRNA group; cells in the latter two groups were transfected with nonsense sequence or SRR siRNA for 48 h, respectively; cells in the latter three groups were added 40 μmol/L Aβ 25-35, and cells in the control group were added same amount of solvent; 24 h after treatment, the SRR protein expression was detected by Western blotting, cell survival was detected by CCK-8, cell apoptosis was detected by Hoechst 33258 fluorescent staining, Caspase 3 activity was detected by enzyme linked immunosorbent assay, and the expressions of activated Caspase 3, N-methyl- D aspartate (NMDA) receptor-associated proteins and postsynaptic dense protein 95 (PSD95) were detected by Western blotting. Results:(1) The survival rate of cells in 0, 20, 40 and 80 μmol/L Aβ 25-35 treatment groups was successively decreased and the SRR protein expression was successively increased, with significant differences ( P<0.05); PC12 cells treated with 40 μmol/L Aβ 25-35 for 0, 12, 24 and 48 h had successively decreased survival rate and successively increased SRR protein expression, with significant differences ( P<0.05). (2) The SRR protein expressions in the SRR siRNA group 1, SRR siRNA group 2 and SRR siRNA3 group 3 were significantly decreased as compared with those in the control group and nonsense sequence group ( P<0.05), and the decrease in the SRR siRNA group 2 was the most obvious. (3) As compared with the control group, the cells in the AD group had significantly increased SRR protein expression and apoptosis rate, statistically decreased cell survival rate, significantly increased Caspase 3 activity and activated Caspase 3 protein expression, significantly increased protein expressions of NMDA receptor 2A (NMDAR2A) and NMDA receptor 2B(NMDAR2B), and statistically decreased PSD95 protein expression ( P<0.05); as compared with cells in the AD group, cells in the AD+SRR siRNA group had significantly decreased SRR protein expression and apoptosis rate, statistically increased cell survival rate, significantly decreased Caspase 3 activity and activated Caspase 3 protein expression, significantly decreased NMDAR2A protein expression, and statistically increased PSD95 protein expression ( P<0.05). Conclusion:Down-regulation of SRR expression can reduce the NMDAR2A protein expression, alleviate the over-activation of NMDA receptor, reduce the cell apoptosis, improve cell survival rate, protect nerve cells, increase PSD95 protein expression, and alleviate synaptic damage in PC12 cells.
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Objective To evaluate the value of real-time ultrasonic elastography in the differential diagnosis of rectal tumors.Methods One hundred patients (30 cases of adenoma and 70 cases of adenocarcinoma) with rectal tumors proved by pathology and 70 normal subjects referred to the First Affiliated Hospital of China Medical University from April 2012 to October 2013 were included in this prospective cohort. All patients underwent real-time ultrasonic elastography. The tumour tissue and reference tissue were chosen for strain ratio measurements. Only tumor tissue was selected for the tumor sample area. Tissue recognized as normal rectal wall and perirectal tissue was selected as the reference sample area. At the same time the elasticity score were calculated. Receiver operating characteristic (ROC) curves of the elasticity score and strain ratio method were used to find the cut-off point of adenoma and adenocarcinoma. The corresponding sensitivity, accuracy and specifi city were calculated. One-way ANOVA was used to comparestrain ratio value among healthy control group, retal adenoma group and rectal adenocarcinoma group and among patients with different preoperative stages of adenocarcinoma group. LSD-t test was used to compare strain ratio value between two groups.Results ROC curve showed that the best cut-off value of elasticity score in diagnosis of rectal tumor was 3, the sensitivity, specificity and accuracy were 85.1%, 73.1% and 82.0%, and the area under ROC curve was 0.780. The best cut-off value of strain ratio in diagnosis of rectal tumour was 2.34, the sensitivity, specifi city and accuracy in diagnosis were 91.4%, 83.3% and 89.0%, and the area under ROC curve was 0.945. Strain ratio of healthy control group, rectal adenoma group and rectal adenocarcinoma group was 0.74±0.44, 1.75±0.58 and 7.48±6.80. There was signifi cantly statistical difference among three groups in strain ratio. Compared with the strain ratio of healthy control group and rectal adenoma group, that of rectal adenocarcinoma group was higher (t=-8.26, P=0.000; t=-6.98,P=0.000). Compared with the strain ratio of healthy control group, that of rectal adenoma group was higher (t=-8.53,P=0.000). Strain ratio of patients with preoperative pathological stages T1, T2, T3 and T4 rectal carcinoma was 4.91±3.60, 7.07±7.23, 8.64±2.62 and 8.58±9.95 and there was no significantly statistical difference among patients with different preoperative stages of adenocarcinoma group (F=0.86,P=0.47).Conclusion The real-time ultrasonic elastography is a promising modalityfor the differential diagnosis of rectal tumors.
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Objective To investigate the value of plasma N terminal brain natriuretic peptide (NT-BNP) in dialysis adequacy assessment of maintenance hemodialysis (MHD).Methods One hundred and twelve MHD patients were divided into hemodialysis adequacy group (group A,63 patients,cardiothoracic ration ＜0.5) and hemodialysis inadequate group (group B,49 patients,cardiothoracic ration ≥ 0.5).The plasma NT-BNP levels of pre-dialysis,dialysis end,4th and 24th hour after dialysis were compared.Before and after dialysis the inferior vena cava diameter (VCD) was checked.The correlation between NT-BNP level at the end of dialysis,cardiothoracic ration and post dialysis VCD were analyzed.Results The levels of NT-BNP in group A,B before dialysis were(13 808 ± 7611) and (25 573 ± 8444)ng/L respectively,and there was significant difference (P ＜ 0.01).The levels of NT-BNP in two groups increased at the end of dialysis,but there was no significant difference (P ＞0.05).Then the levels of NT-BNP in two groups decreased significantly at 4th hour after dialysis (P ＜ 0.01).The levels of NT-BNP in two groups at 4th hour after dialysis were (8256 ±6611) and (21 320 ±6828) ng/L,and there was significant difference (P＜ 0.01).At 24th hour after dialysis,the level of NT-BNP in group A was still at a low level,but in group B,the level of NT-BNP increased again.Before dialysis,the levels of VCD between two groups had no significant difference (P ＞ 0.05).After dialysis,the level of VCD in group B decreased significantly(P ＜ 0.05).After dialysis,the level of VCD in group B was significantly higher than that in group A(P＜ 0.05).The level of NT-BNP had positive relationship with cardiothoracic ration and VCD (r =0.462,P＜ 0.01 ;r =0.513,P＜ 0.01).Conclusion The level of NT-BNP can reflect the volume overload and urea clearance index of MHD,which may be a more comprehensive evaluation index of the adequacy of dialysis.
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Objective To study the sonograms of tuberculous peritonitis and improve the diagnostic accuracy of this disease.Methods We retrispectively analyzed 138 cases of tuberculous peritonitis diagnosed by ultrasonically guided biopsy,postoperative pathology,and clinical manifestation.The characteristics of the sonograms were analyzed,including the amount and character of ascites,the changes in greater omentum,peritoneum,and mesenterium.the enlarged celiac lymph nodes,and the organ involvement.Results The sonograms of tuberculous peritonitis were characterized by thickening of greater omentum with different degrees of ascites,which usually presented cerebral fissure sign under high-frequency ultrasound,together with aggregation of intestines,thickening of peritoneum,enlarged celiac lymph nodes,hepatomegaly,splenomegaly,and pleural effusion.Conclusion Ultrasonography is of great clinical significance in the diagnosis of tuberculous peritonitis and the guidance of greater omentum biopsy.