Objective To investigate the sanitary condition in the inside and outside of a metro station in Guangzhou, and to find the environmental risk factors which can affect the health of staffs of the metro station. Methods To monitor the level of TVOC, inhalable particles, carbon monoxide, benzene, carbon dioxide, formaldehyde and total bacterial count in the air of public places metro hall, metro platform,facilities rooms, tunnel gates, new flow entrances and entrances of subway station respectively in the afternoon and evening, Feb 15, 2006. Results The rate of exceeding standard limit of the pollutants in metro station in the evening was higher than that in the afternoon, and the main items exceeded the limit were inhalable particles, benzene and carbon monoxide, especially in the evening. The level of inhalable particles in the metro hall and facilities rooms both exceeded standard limit. The level of every pollutant in the inside and outside of the station in the evening was higher than that in the afternoon P

Objective To know the sanitary situation of urban river surge and a certain section of Zhujiang River and whether Guangzhou reach of Zhujiang River will be taken as a swimming region. Methods From July 1 to July 15,2007,the period of swim,the spring-tide water and ebb-tide water at urban river surge and a certain section were sampled and tested. 54 water sample at urban river surge and 40 at a certain section,the items included pH value,turbidity,dissolved oxygen,chemical oxygen demand, amino-nitrogen and heat-resistant coliform. Results The results indicated that pH value and chemical oxygen demand of the water at urban river surge and a certain section were eligible,but amino-nitrogen,dissolved oxygen and heat-resistant coliform were not eligible,the turbidity was high,the water quality did not meet the Hygienic Standard for Swimming Place (GB 9667-1996). The chemical oxygen demand in spring-tide water was lower than that in ebb-tide water(P

BACKGROUND: Tissue-engineered skin plays an important role in the repair and reconstruction of large-area skin lesion. Little is known about the effects of Chinese medicine-loading tissue-engineered skin scaffold on cell adhesion and wound surface infection. OBJECTIVE: To screen the application concentration of shengji solution, which can promote tissue regeneration, using keratinocytes and fibroblasts, and to observe the effects of shengji solution-gelatin-chitosan drug-loading skin scaffold on cellular adhesion and biocompatibility. DESIGN, TIME AND SETTING: Taking keratinocytes and fibroblasts as subjects, the present randomized and controlled experiment was performed at the Laboratory of Cell Engineering, Orthopedic Institute, Tianjin Hospital between February and August 2005. MATERIALS: One healthy big-ear rabbit was included for harvesting skin seed cells. Shengji solution, Danggui (Radix Angelicee Sinensis) and Shengdi (rehmannia dride rhizome) extract (self-extracted, 1.5 g/mL), gelatin-chitosan scaffold and shengji solution-gelatin-chitosan scaffold were provided by Tianjin University, China. METHODS: Passage 3 keratinocytes and fibroblasts were harvested by dispase Ⅱ- trypsase- ethylenediamine tetraacetic acid(EDTA) digestion. The prepared cells were divided into 5 groups: control, shengji solution, Danggui, Shengdi, and epidermal growth factor (EGF). Common culture solution containing 0.1 volume fraction of fetal bovine serum, shengjisolution (5, 6, 8, and 12 g/L), Danggui extract (8 g/L), Shengdi extract (8 g/L), and EGF culture medium (10 μ g/L) were used in corresponding groups for cell culture. At 1, 3, 5, and 7 days, cellular proliferation was detected by methyl thiazolyl tetrazolium (MTT) assay. Keratinocytes and fibroblasts were cultured in different concentrations of shengji solution (50, 60, 80, and 120 g/L) and grouped according to different concentrations. At 7 and 14 days, cellular adhesion was observed by semi-quantitative method. At 4, 7, and 14 days, keratinocytes cultured by 60 and 80 g/L shengji solution were harvested for hematoxylin-eosin staining and subsequent scanning electron microscope observation. MAIN OUTCOME MEASURES: Effects of shengji solution on skin seed cell proliferation; effects of drug-loading scaffold on cellular adhesion; and cell-carrier biocompatibility. RESULTS: MIF detection results demonstrated that cells significantly proliferated after treatment of 5, 6, and 8 g/L shengji solution compared to the control group (P < 0.05). Obvious proliferation of passage 3 keratinocytes and fibroblasts was found on 60 and 80 g/L drug-loading scaffold. Keratinocytes on the drug-loading scaffold exhibited good cellular morphology and closely adhered to the scaffold. Shengji solution had no apparent toxic effects on cells. CONCLUSION: Shengji solution (60 and 80 g/L)-gelatin-chitosan scaffold can effectively promote the adhesion and proliferation of keratinocytes and fibroblasts.

Objective To evaluate the differences of α-fetoprotein (AFP), ffeeβ-human chorionic gnnadotropin (HCG) indexes in 3 foreign median databases for antepartum risk screening, and establish the median databases of normal pregnant women in Wenzhou for antepartum screening of AFP, free-β-HCG indexes through the suitable median computational models. Methods The levels of AFP and free β-HCG of 20054 normal pregnant women in Wenzhou were detected by time-resolved fluorometry. The data in this paper were compared with the data of 2T-risk ( 2T), Lifecycle-2. 2 (LC2.2 ) and Lifecycle -3.0 (LC3.0) by double-factor ANOVA. The differences between the data in the paper and the data from Shenyang and Ningbo were analyzed. The median database of Wenzhou pregnant women was established by the suitable regression model, with the stability of nonlinear regression models of the 3 software assessed by model correcting fitting, distribution mean of model fitting logarithmic and standard deviation. Results The levels of AFP and freeβ- hCG reported here were 10% and 16% higher than the data of 2T-risk, 15% and 20% higher than that of LC 2. 2, 6% and 17% higher than that of LC 3.0 respectively. The differences were statistically significant. ( FAFP = 161. 757 ,P < 0. 01 ; Ffree-β-HCG = 58. 261, P < 0.01 ). The levels of AFP and free β- hCG in Wenzhou were 2% higher and 3% lower than that of Shenyang, 1% and 2% higher than that of Ningbo. There was no statistical difference of AFP levels among Wenzhou , Shenyang and Ningbo( FAFP = 0. 174 ,P =0. 840) while the differences of free-β-hCG were statistically significant( F<,free-β-HCG> = 13.303 ,P < 0. 01 ). The differences of quadratic equation regression model, exponent quadratic function regression model and exponent quadru-function regression model of 2T, LC-2. 2 and LC-3.0 were not remarkable. The exponent quadru-function regression model was the best. Conclusions There are significant differences between the data from Wenzhou, Shenyang and Ningbo and the data of T-2 risk, LC-2. 2, LC -3.0. The discrepancy is due to the ethnic and different parameters of regression models. So the model parameters and the median databases are urgently required in China. The differences of large sample size of AFP from Wenzhow, Shengyang and Ningbo are not significant, while the differences of free-β- hCG from Wenzhow, Shengyang and Ningbo is remained because of its instability. The levels from Wenzhow and Ningbo are near. It is suggested that the laboratories with small sample size can establish their own laboratory parameters using the reference obtained from large sample size under the same experimental conditions. There are no significant differences of stability among regression computational models in the 3 software. The exponent quadru-function regression model can be used to establish the median databases for the screening with the similar data distribution in the paper.

Objective To evaluate the effects of ulinastatin postconditioning and combination of ulinastatin preconditioning and postconditioning on myocardial apoptosis in patients undergoing cardiac valve replacement with cardiopulmonary bypass (CPB).Methods Eighty New York Heart Association (NYHA) class Ⅱ or Ⅲ patients of both sexes,aged 21-59 years,scheduled for cardiac valve replacement with CPB,were randomly divided into four groups (n =20 each):normal saline control group (group C),ulinastatin preconditioning group (group U1),ulinastatin postconditioning group (group U2) and ulinastatin preconditioning plus postconditioning group (group U3).In group U1,uinastatin 20000 U/kg was infused via the central vein at 500-1000 U·kg-1 · min-1 after endotracheal intubation until 10 minutes before blocking the ascending aorta.In group U2,ulinastatin 10000 U/kg was infused via the aortic root at 4000-5000 U· kg-1 · min-1 at 5-7 minutes before opening the aorta.In group U3,ulinastatin preconditioning and postconditioning were performed as described in groups U1 and U2.In group C,the same volume of normal saline was infused instead of ulinastatin.Blood samples were taken from the radial artery at 10 minutes before blocking the ascending aorta,40 minutes after blocking the ascending aorta,45 minutes after opening the aorta and at the end of operation for determination of plasma concentrations of tumor necrosis factor-alpha (TNF-α) and soluble tumor necrosis factor receptor 1 (sTNF-R1).Myocardial tissues were obtained from the right atrial appendage at 45 minutes after opening the aorta for determination of the expression of TNF-α,bcl-2,bax,caspase-3,and apoptosis.The bcl-2/bax ratio and apoptotic index were calculated.Results Plasma concentrations of TNF-α and sTNF-R1 and the expression of TNF-α,bax,caspase-3 and apoptotic index were lower and the expression of bcl-2 and bcl-2/bax ratio were higher in groups U1,U2 and U3 than in group C and they were lower in group U3 than in groups U1 and U2 (P ＜ 0.05).Conclusion Ulinastatin postconditioning can inhibit myocardial apoptosis in patients undergoing cardiac valve replacement with CPB,and the efficacy of combination of ulinastatin preconditioning and postconditioning is stronger than that of ulinastatin postconditioning.The mechanism is involved in balancing the expression of bax and bcl-2 and down-regulating the expression of TNF-α and its receptor.

Objective:To explore the strategies and complications of the submucosal tunneling endoscopic resection (STER) in the treatment of esophageal duplicated cyst (EDC).Methods:From January 2013 to December 2019, at Department of Gastroenterology, Taizhou Hospital of Zhejiang Province, the clinical data of 11 hospitalized patients with EDC diagnosed by pathological examination who underwent STER were collected. The clinical featured, computed tomography (CT) findings, endoscopic findings, postoperative efficacy, complications and pathological results after operation were summarized.Results:Among the 11 patients, there were 6 males and 5 females, the age ranged from 13 to 67 years, and the mean age was (43.0±18.2) years. One case presented with swallowing obstruction, 1 case with belching, 4 cases with upper abdominal pain, and the remaining 5 cases had no specific clinical symptoms. Under endoscopy, the lesions of 11 patients were hemispherical or mound-shaped with smooth surface submucosal masses in the esophageal cavity, which were soft to touch. Under endoscopic ultrasonography, they all appeared as hypoechoic masses with clear boundary located in the esophageal muscularis propria. The results of CT scan of 9 patients showed round low-density cystic masses, among them 7 cases showed mild enhancement. The maximum diameter of the cysts was 1.5 to 4.4 cm, with mean maximum diameter being (2.8±0.8) cm, and the maximum diameter of most patients (7 cases) were 2 to 3 cm. The other two patients showed only slightly thickened esophageal wall on CT. Five lesions occurred in the horizontal mediastinum of the lower esophagus. All the 11 patients underwent STER operation successfully, among them 6 patients received simple STER and the cysts were completely resected, and the other 5 patients received STER and cauterization with argon ion for the residual cyst wall. The pathological results after operation indicated that 6 cases were congenital esophageal cysts and 5 cases were bronchogenic cysts. The median follow-up time (range) of 11 patients was 42 months (12-86 months). Ten patients recovered well after the operation, and local recurrence, malignant transformation or metastasis were not found. One case had recurrence, and was treated with STER and cauterization with argon ion for residual cyst wall and cured. No complications such as bleeding, fistula, mediastinal infection or death occurred during and after operation in all the 11 patients.Conclusions:STER is a minimally invasive, safe and effective treatment for EDC, and may be a new treatment for EDC.

Objective To evaluate the effects of ulinastatin on renal ischemia-reperfusion injury in patients undergoing operation on aorta with deep hypothermic circulatory arrest (DHCA ) .Methods Thirty patients ,aged 30-50 yr ,of ASA physical status Ⅲ or Ⅳ (NYHA Ⅱ or Ⅲ) ,scheduled for elective operation on aorta with DHCA ,were randomly divided into 2 groups ( n=15 each) using a random number table :control group (group C ) and ulinastatin group (group U ) .In group U ,ulinastatin 20 000 U/kg was infused via the central vein at 500-1 000 U·kg-1 ·min-1 from the time immediately after tracheal intubation until 10 min before ascending aortic cross-clamping .In group C ,the equal volume of normal saline was infused instead of ulinastatin .At 5 min before the beginning of DHCA (T1 ) and 15 min after the end of DHCA (T2 ) ,blood samples were taken from the extracorporeal circulation for determination of polymorphonuclear leukocyte counts , and plasma levels of intercellular adhesion molecule-1 , tumor necrosis factor-α, iterleukin-6 (IL-6 ) IL-8 , IL-10 , malondialdehyde , myeloperoxidase ,atrial natriuretic peptide ,cystatin C ,and creatinine .Results The polymorphonuclear leukocyte counts and plasma levels of intercellular adhesion molecule-1 , tumor necrosis factor-α, IL-6 , IL-8 , malondialdehyde , myeloperoxidase , cystatin C , and creatinine were significantly lower , and the plasma concentrations of IL-10 and atrial natriuretic peptide were higher in group U than in group C ( P< 0.05 ) . Conclusion Ulinastatin can attenuate renal ischemia-reperfusion injury in patients undergoing operation on aorta with DHCA and inhibition of inflammatory responses is involved in the mechanism .

Objective To evaluate the role of Fas/FasL signaling pathway in ulinastatin postconditioning-induced attenuation of apoptosis in the myocardial cells of patients undergoing cardiac valve replacement with cardiopulmonary bypass (CPB).Methods Forty patients of both sexes,aged 21-59 yr,of ASA physical status Ⅱ or Ⅲ (NYHA class Ⅱ or Ⅲ),scheduled for elective cardiac valve replacement with CPB,were randomly divided into 2 groups (n =20 each):control group (group C),and ulinastatin postconditioning group (group U).In group U,ulinastatin 10 000 U/kg was perfused via the aortic root at 4 000-5 000 U·kg-1 ·min-1 starting from 5 min before aortic unclamping.In group C,the equal volume of normal saline was infused instead of ulinastatin.Myocardial specimens were taken from the right auricle at 45 min after aortic unclamping for determination of Fas,Fas ligand (FasL),caspase-8,Bcl-2 and Bax expression and cell apoptosis.The ratio of Bcl-2 expression to/Bax expression (Bcl-2/Bax) and apoptotic index were calculated.Results Fas,FasL,caspase-8 and Bax expression and apoptotic index were significantly lower,and Bcl-2 expression and Bcl-2/Bax were higher in group U than in group C.Conclusion Ulinastatin postconditioning attenuates apoptosis in the myocardial cells through inhibiting Fas/FasL signaling pathway in the patients undergoing cardiac valve replacement with CPB.

Objective To investigate the role of phosphatidylinositol 3-kinase (PI3K)/protein-serine-threonine kinases (Akt) signal pathway in ulinastatin postconditioning-induced attenuation of apoptosis in myocardial cells in patients undergoing cardiac valve replacement with cardiopulmonary bypass (CPB).Methods Forty NYHA class and ASA physical status Ⅱ or Ⅲ patients of both sexes,aged 21-59 yr,scheduled for cardiac valve replacement with CPB,were randomly divided into 2 groups (n =20 each):normal saline control group (group C) and ulinastatin postconditioning group (group U).In group U,ulinastatin 10 000 U/kg was perfused via the aortic root at 4000-5000 U· kg-1 · min-1 starting from 5 min before aortic unclamping.In group C,the equal volume of normal saline was given instead of ulinastatin.Myocardial specimens were taken from the right auricle at 45 min after aortic unclamping for determination of the expression of Akt,phosphorylated Akt (p-Akt),cytochrome c,caspase-9,Bcl-2 and Bax,and cell apoptosis.Bcl-2/Bax ratio and apoptotic index were calculated.Results The expression of p-Akt and Bcl-2 and Bcl-2/Bax ratio were significantly higher,and the expression of cytochrome c,caspase-9 and Bax and apoptotic index were lower in group U than in group C (P ＜ 0.05).Conclusion Ulinastatin postconditioning attenuates apoptosis in myocardial cells in patients undergoing cardiac valve replacement with CPB through activating PI3K/Akt signal pathway.

Objective To investigate effects of ulinastatin preconditioning on cerebral ischemia-reperfusion injury in patients undergoing operation on aorta with deep hypothermic circulatory arrest.Methods 30 patients aged 30-50 with national institutes of health stroke scale(NIHSS) ＜ 10 undergoing operation on aorta with deep hypothermic circulatory arrest,were randomly divided into 2 groups(n =15):normal saline control group(group C),ulinastatin preconditioning group(group U).In group U,ulinastatin 20 000U/kg was infused via central vein at 500-1000 U · kg-1 · min-1 from after tracheal intubation,until 10 min before ascending aortic cross-clamping.In group C,same volume normal saline was infused instead of ulinastatin.Blood samples were taken from internal carotid vein at 5 min before the beginning of deep hypothermic circulatory arrest(T1),15 min after the beginning of deep hypothermic circulatory arres(T2)and 15 min after the end of deep hypothermic circulatory arrest(T3)for determination of plasma concentrations of S-100β,CK-BB,Glutamate(Glu) 、TNF-α、IL-1 、IL-10、MDA,SOD and TGF-β1.Cerebral funcition was evaluated and scored using NIHSS at 2 day after operation.Results Plasma concentrations of S-100β,CK-BB,Glu,TNF-o、IL-1 and MDA were lower,the levels of SOD,IL-10 and TGF-β1 were higher,and the NIHSS score was lower in group U (P ＜ 0.05).Conclusion Ulinastatin preconditioning can lighten cerebral ischemia-reperfusion injury in patients undergoing operation on aorta with deep hypothermic circulatory arrest.The mechanism is involved in inhibit the formn of reactive oxygen free radical.