Objective To explore the residual level of FPMs in indoor dust samples in Shenzhen from 2020 and 2021, and to analyze its temporal distribution characteristics. Methods In the present study, indoor dust samples (n=193) from residential buildings in Shenzhen. were collected to analyze the temporal variation characteristics of FPMs. Ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was applied to determine the concentrations of FP and its four major metabolites (fipronil-sulfone, fipronil-sulfide, fipronil-desulfinyl, and fipronil-amide; abbreviated as FP-SFO, FP-SFI, FP-DES, and FP-AM) in the samples. The sum of the concentrations of FP and its four metabolites was represented as additive mass concentration (ΣFPMs). Additionaly, Wilcoxon test was performed to determine the temporal distribution differences of FPMs’ concentrations. Results From 2020 to 2021, the concentration of ΣFPMs for the in door dust samples in Shenzhen ranged from 0.51 to 4 415 ng/g (median: 18.8ng/g). FP, FP-SFO AND FP-SFI were the major target analytes in the sample with detection rates of 90.60%，86.20% and 75.40%, respectively. The detection rates of other metabolites were low (≤ 44.3%). Analysis of the temporal variation trend of FPMs’ concentrations showed that there was no significant difference in the levels of ΣFPMs between warm season（spring and summer）and cold season（autumn and winter）in the indoor dust samples from 2020 to 2021(2.38 vs 2.84ng/g , P > 0.05). However , the concentrations of FP-SFI and ΣFPMs in the indoor dust samples collected from 2021 showed an significantly increasing trend compared with 2020（1.02 vs 1.89 , 17.80vs. 20.10 ng/g , P < 0.05). Conclusion From 2020 to 2021 , the detection level of FPMs in indoor dust in Shenzhen is relatively high and shows an upward trend , with no obvious seasonal difference. However, whether the residual level of FPMs in indoor dust poses a risk to human health needs further study.

Objective : To investigate the synergistic inhibitory effect of disulfiram (DSF) combined with Oxaliplatin (Oxa) on gastric cancer cells BGC⁃823. Methods : Cell viability was assessed with CCK⁃8 assay. CompuSyn software was used for fitting the Fraction⁃Effect curve to evaluate the combined effect of the two agents. AnnexinV/ PI staining detected apoptosis rate of BGC⁃823 by flow cytometry. Pyridine iodide (PI) staining detected the rate of dead cells by flow cytometry. BODIPY 581/591 C11 dye (Invitrogen) staining detected lipid peroxidative free radicals (LipROS) level by flow cytometry. qRT⁃PCR detected the mRNA levels of ferroptosis⁃related markers PTGS2 , GPX4 and SLC7A11 . Results : DSF and Oxa alone or in combination could inhibit the viability of BGC⁃823 cells in a time⁃ and dose⁃dependent manner, and the combination of the two drugs could exert a synergistic effect. DSF syn⁃ ergized with Oxa to induce apoptosis and ferroptosis in gastric cancer cells. The combination of DSF and Oxa could induce significantly increased LipROS level , resulting in a significant increase in the ferroptosis marker PTGS2mRNA level and a significant decrease in the ferroptotic markers GPX4 and SLC7A11 mRNA levels. Conclusion Disulfiram synergizes with Oxaliplatin to inhibit the cell viability , induce BGC⁃823 cell apoptosis and ferroptosis.

Objective:To investigate the dynamic expression of histone methyltransferase (enhance of zeste homolog 2, EZH2) in peripheral blood B lymphocytes (CD19 +B) and memory B lymphocytes (CD19 +CD27 +B) of septic patients and its value in predicting prognosis in sepsis. Methods:From June 2018 to January 2020, 48 septic patients in the Intensive Care Unit of Shanghai East Hospital were enrolled, and 40 healthy adult volunteers were recruited as healthy controls. Septic patients were divided into the non-survivors (18 cases) and the survivors (30 cases) according to whether the patients survived at 28 days. Blood samples were collected at day 1, 3 and 7, blood routine, IL-6 and blood gas analysis were collected, and SOFA and APACHE Ⅱ scores were counted. Flow cytometry was used to detect the positive rate and the mean fluorescence intensity of EZH2 on CD19 +B lymphocytes, and the positive rate of EZH2 on CD19 +CD27 +B lymphocytes at different time points. In the healthy controls, fasting was taken only once in the morning. ROC curve was drawn and the area under the curve (AUC) was calculated to evaluate the value of expression of EZH2 on CD19 +B lymphocytes and CD19 +CD27 +B lymphocytes in predicting the prognosis of septic patients. Results:(1) Compared with the healthy controls, the positive rate and average fluorescence intensity of EZH2 on CD19 +B lymphocytes and the positive rate of EZH2 expression on CD19 +CD27 +B lymphocytes were significantly increased at day 1, 2 and 3 in septic patients ( P<0.05). Over time, the expression of EZH2 in CD19 +B lymphocytes and CD19 +CD27 +B lymphocytes increased gradually ( P<0.05). (2) Compared with the survivors, the positive rate of EZH2 on CD19 +B lymphocytes of the non-survivors was increased at day 1, but the positive rate of EZH2 on CD19 +CD27 +B lymphocytes of the non-survivors was decreased at day 3 and 7 ( P<0.05). (3) The positive rate of EZH2 on CD19 +B lymphocytes, APACHE Ⅱ score, SOFA score and IL-6 level in septic patients at day 1 were independently associated with 28-day mortality. (4) The AUC of APACHEⅡ score was 0.907 (95% CI: 0.825-0.990), and the sensitivity and the specificity were 88.89% and 76.67%. The AUC of SOFA score was 0.831 (95% CI: 0.706-0.955), and the sensitivity and the specificity was 66.67% and 86.67%; The AUC of EZH2 positive rate on CD19 +B lymphocytes were 0.799 (95% CI: 0.657-0.941), and the sensitivity and specificity were 88.89% and 80.77%, respectively, the sensitivity was better than SOFA score, and the specificity was higher than APACHEⅡ score. Conclusions:The high expression of EZH2 on B lymphocytes in septic patients is associated with poor prognosis. Dynamic monitoring of EZH2 expression on B lymphocytes has certain predictive value for sepsis.

Objective To compare the effect of different enteral nutritional support methods in elderly patients with severe pneumonia.Methods Elderly patients (average age over 65 years) with severe pneumonia admitted to our hospital from June 2015 to June 2018 were selected as the study subjects,and 86 patients finally completed the study.The patients were randomly divided into the control group and observation group with 43 patients in each group,and nasojejunal tubes were placed for patients in both groups.Patients in the observation group were fed with enteral nutrition emulsion through continuously-heated nutritional pump,while patients in the control group was meal served with enteral nutrition emulsion.Changes in blood biochemical parameters,immune indexes,inflammation indexes,oxygenation indexes,the GIDF and SOFA scores as well as curative effect (mechanical ventilation time and effective rate of treatment) were monitored and compared before and after 10 days of nutritional support treatment.SPSS 20.0 statistical software package was used for data analysis,and self paired t-test was used for comparison before and after intervention in the same group,x2 test was used in comparison between different groups,and the counting data was expressed as the rate (n,％).Results There was no significant difference in baseline data between patients in the two groups (P＞0.05).After ten days of intervention,compared with the control group,the levels of serum albumin and prealbumin in the observation group were higher [(31.22±2.36) g/L and (0.29±0.24) g/L,P=0.015 and P=0.023],the immune indexes were higher [IgG (13.24±0.70) g/L,P=0.020;IgM (1.43±0.19) g/L,P=0.011;CD4+/CD8+ 1.55±0.49,P=0.043],the inflammation indexes were lower [IL-6 (312.54±42.53) pg/mL,P=0.031;PCT (1.56±0.81) ng/mL,P=0.017],the oxygenation indexes were better [PaO2/FiO2 (315.58±20.37) mmHg,P=0.019],and the GIDF and SOFA scores were significantly lower[(10.6±l.2) and (8.5±1.7),P=0.041 and P=0.038].The clinical outcome showed that the mechanical ventilation time in the observation group was significantly shorter [(6.01±1.48) d vs (8.12 ± 1.17)d,P=0.039],and the total effective rate of treatment was better than the control group (67.44％ vs 41.86％,P=0.027).Conclusions Enteral nutrition support through continuously-heated nutritional pump can improve the nutritional status of elderly patients with severe pneumonia,reduce the incidence of gastrointestinal dysfunction,maintain stable organ fuction,thus resulting in better prognosis in elderly patients with severe pneumonia.

Objective:To evaluate the early diagnostic value of tissue inhibitor of matrix metalloproteinase-2 (TIMP-2) and insulin-like growth factor binding protein-7 (IGFBP-7) in acute kidney injury induced by sepsis.Methods:A total of 85 sepsis patients admitted to the EICU and GICU in Shanghai East Hospital from September 2017 to June 2019 were divided into theAKI group ( n=37) and the non-AKI group ( n=48) according to KIDGO diagnostic criteria, and 20 healthy volunteers were served as the control group. The clinical data were recorded and samples of urine were collected at 0 h, 6 h, 12 h, 1 d, 3 d and 7 d post sepsis. The levels of TIMP-2 and IGFBP-7 in the urine were analyzed with ELISA at different time points. Based on the receiver operating characteristic curve (ROC) and the area under the curve (AUC), the early diagnostic value of urinary TIMP-2 and IGFBP-7 in sepsis-induced AKI patients was determined. Results:Compared with the control group, the levels of TIMP-2 and IGFBP-7 of the AKI group were significantly higher at the above time points ( P<0.05), while those of the non-AKI group showed no significant differences. The levels of TIMP-2 and IGFBP-7 of the AKI group were significantly higher than the those of the non-AKI group ( P<0.05). ROC analysis showed that when the AUC of urine TIMP-2 peaked at 1 d, the sensitivity and specificity reached 97.5% and 81.2%, separately with the cutoff value of 151.23 ng/mL. Furthermore, when the AUC of urine IGFBP-7 peaked at 12 h, the sensitivity and specificity reached 100% and 72.8%, separately with the cutoff value of 14.91 ng/mL. Interestingly, when the AUC of combined TIMP-2×IGFBP-7 peaked at 12 h, the sensitivity reached 98.0% and specificity reached 91.5% with the cutoff value of 2.09 [(ng/mL) 2/1 000]. There was no significant correlation between the levels of TIMP-2 and IGFBP-7 with SOFA and APACHEⅡ score at 1 d, 3 d and 7 d post sepsis in the AKI group ( P>0.05). Conclusions:Urine TIMP-2 and IGFBP-7 have early diagnostic value in sepsis-induced AKI. Besides, the combination of the two biomarkers have superior predictive value than each single of them.

Objective To explore the efficacy of temporary titanium plate screwing for positional maintenance in reduction and internal fixation for displaced acetabular fractures.Methods A retrospective study was conducted of the 28 patients (28 hips) with displaced acetabular fracture who had been treated by open reduction and internal fixation from October 2013 to March 2016.They were 20 males and 8 females,aged from 24 to 68 years (average,42.3 years).The time from injury to surgery ranged from 7 to 21 days(average,14.5 days).According to the Letournel-Judet classification,there were 2 posterior column fractures,4 transverse fractures,5 posterior column plus posterior wall fractures,6 transverse plus posterior wall fractures,2 T-shaped fractures,3 anterior and posterior transverse fractures and 6 double column fractures.The posterior acetabular approach or combined anterior and posterior approach was used.In all the patients temporary titanium plate screwing was conducted to fix one side of the fracture so as to facilitate accomplishment of open reduction and internal fixation without losing the indirect anatomic reduction of the intraarticular fracture.After the open reduction and internal fixation was accomplished,the temporary screw fixation was removed in 26 patients but retained in 2 patients as needed.The reduction quality,complications and outcomes at the final follow-ups were recorded.Results All the 28 patients were followed up for 10 to 36 months (mean,15.6 months).By the Matta criteria,anatomical reduction was achieved in 26 cases,unsatisfactory reduction in one and poor reduction in one,yielding an anatomic reduction rate of 92.9％.By the improved Mere d'Aubigne & Postel criteria,the clinical outcomes at the final follow-up were excellent in 27 cases and good in one,yielding a good to excellent rate of 100％.Postoperatively,heterotopic ossification of different severities occurred in 11 cases but did not affect their joint function;transient paralysis of the sciatic nerve was reported in 6 cases but recovered 3 months after surgery.No complications like avascular necrosis of the femoral head or walking pain were observed during follow-ups.Conclusion Temporary fixation with titanium plate screws during open reduction and internal fixation for displaced acetabular fractures can effectively improve the reduction and fixation of the articular surface,leading to satisfactory short-term clinical outcomes.

Objective To discuss the feasibility and the curative effect of transurethral diverticulum section in the treatment of female urethral diverticulum.Method We retrospectively analyzed the transurethral diverticulum section surgeries of 11 adult female patients diagnosed as urethral diverticulum in our hospital from August 2012 to October 2016.The patients aged from 33 years old to 74 years old with an average age of 43.Their medical histories varied from 1 month to more than 40 years with an average histories of 80 months.Major symptoms included odynuria,frequent micturition,dyspareunia,perineum bearing-down feeling,repetitive urinary tract infection,dysuria,urinary stuttering,penis masses,etc.One patient underwent TVT-O.Two patients had urinary catheterization before the disease.During physical examination,cystic masses of different sizes could be touched on anterior vaginal walls with pain and secretion.Cystic lesions can be found by imaging examination.Transurethral diverticulum section was performed under general anesthesia.Using needle electrode by resectoscope,we made an annular incision in the direction of the vertical axis of the urethra,from the beginning of diverticulum ostium.The diverticulum completely communicated with the urethra.In 11 patients of transurethral endoscopic,the urethral sphincter and the diverticulum wall appeared morphological integrity and no damage.There was no liquid drained to de vagina.There was no urethral sphincter injury and no urethral vaginal leakage.We observed the operation time,bleeding volume,diverticulum position,the number of diverticulum,urethral sphincter intraoperative.We also observed the postoperative symptoms,short-term and long-term complications.Result All surgeries went on well,in which urethral diverticula were fully opened.The operation time was 30-45 minutes,average 35 minutes.The amount of bleeding within 5 ml.4 cases with multiple diverticulum,with 2 cases of diverticulum ostia were 2,2 cases of diverticulum ostia were 3.The other 7 cases with single diverticulum,diverticulum ostium was 1.The catheters were removed 2 weeks after the surgery,after that all patients can urinate normally.The follow-up time was 5-55 months (mean,24 months).All pre-surgical symptoms disappeared and no complication occurred,such as urethral stricture,urinary incontinence,urethro-vaginal fistula,etc.Conclusion Transurethral diverticulum section is a reliable treatment for female urethral diverticulum with positive curative effect and no obvious complication.

Objective To explore the effect of different levels of iodine excess on morphological changes of mouse thyroid follicle and pancreatic acinar cells.Methods Sixty female mice (BALB/c) were selected and their body weight were 18-22 g.The mice were divided into 6 groups according to body weight via the random number table method,10 mice in each group.Potassium iodate was added to drinking water in exposure groups with iodine contents of 300,600,1 200,2 400,and 4 800 μg/L,while normal group (control) was given normal levels of iodine (5 μg/L) tap water.After feeding for one month,the thyroid and pancreas of the mice were harvested,and the morphology of thyroid follicle and pancreatic acinar cells were observed through light microscope and ultrastructural changes of pancreas were observed through electron microscope.Results After one month of feeding,mice in the high iodine drinking water groups,starting from the 1 200 μg/L group,thyroid follicular cavity gradually enlarged and cells became flat;swollen and vacuolar-like deformation were observed in the mouse pancreas acinar cells under light microscope.Under the electron microscope,the ultrastructure of pancreatic acinar cells changed significantly starting from the 600 μg/L group,the number of zymogens decreased,organelle degeneration and necrosis,and endoplasmic reticulum expanded.Conclusion Iodine excess can cause damage to pancreatic acinar cells in mice.

Objective To compare vacuum-assisted excision with periareola incision surgery for benign breast cancer.Methods One hundred and twenty one patients with benign breast nodules treated in our hospital from October 2014 to October 2015 were enrolled in the study,including 58 cases received vacuum-assisted excision (study group) and 63 cases received periareola incision surgery (control group).There were no differences in age[(30.2 ±5.4) vs.(32.1 ±6.2) years] and tumor diameter[(1.3 ±0.4) vs.(1.5 ± 0.3) cm] between two groups.Results There were no severe complications in both groups.Compared with the control group,the operation time was shorter] (20.4 ±4.7) vs.(48.2 ± 15.4)min,t =3.165,P =0.006],intraoperative blood loss was less [(18.4 ± 5.7) vs.(17.2 ± 3.7) ml,t =-0.297,P =0.672],malformation rate was lower [5.2％ (3/58)vs.22.2％ (14/63),x2 =7.27,P =0.007],incidence of postoperative hematoma was higher [20.7％ (10/58) vs.6.3％ (4/63),x2 =3.502,P =0.041],and the cost of surgery was more expensive(5 100 ± 300) vs.(3 400 ± 1 200) Yuan,t =2.181,P =0.023].Conclusion Comparing with conventional periareolar incision surgery,the vacuum-assisted excision has its advantages and disadvantages for treatment benign breast tumors,and two surgical modalities can be chosen accordingly.

Organoselenium compounds are bioactive substances with extensive physiological activities .As a representa-tive compound ,ebselen could be used as mimics of glutathione peroxidase ,and in the treatment of many diseases ,such as car-diovascular and cerebrovascular diseases ,inflammation and noise-induced hearing loss .the research progress in physiological activities and synthetic methods of ebselen were reviewed in this paper .