Objective To understand the pollution of particulate matters and the distribution of heavy metals in particulate matters. Methods Samples were collected with auto-sampling instrument for 32 consecutive days in heating period of Dec. 2003-Jan,2004, in a central area of Tianjin. The heavy metals were detected with atomic absorption spectrum, atomic fluorescence spectrum and plasma emission spectrum, 9 heavy metals were measured quantitatively. Results The rates of over standards for daily mean of TSP, IP, PM2.5 in heating period were 54.55%, 57.58%, 84.85% respectively. Content of some heavy metals such as Cd, Pb, Ni in the particulate matters were higher. Conclusion Air pollution with particulates in heating period is serious. PM2.5 carries more heavy metals than TSP and IP, so it is much more harmful to human health.

Objective To investigate the effect of nanotubes on rat aortic endothelium damage.Methods Wistar rats were intratracheally instilled with carbon nanotubes(CNTs) at the doses of 0,3.5 and 17.5 mg/kg,and with a carbon black negative control,or a quartz positive control.The rats were euthanized after 7 or 30 days of the single treatment,the oxidative stress(GSH,O_2~-?) was determined by using biochemical kits,the expression of sICAM-1 and sVCAM-1 in serum was determined by using ELISA kits and ICAM-1 and VCAM-1 on aortic endothelium was determined with immunohischemistry.Results The content of GSH and O_2~1?in serum increased with a dose-dependent and time-dependent manner.A up-regulated expression of sICAM-1 and sVCAM-1 in serum and ICAM-1 and VCAM-1 in the aortic endothelium was seen.No vascular damage was seen in the rat treated with carbon black,in those treated with high-dose CNTs obvious inflammation was revealed.Conclusion Carbon nanotubes exposure can induce oxidative stress which may be followed by the up-regulated expression of sICAM-1 and sVCAM-1 in serum and ICAM-1 and VCAM-1 in the aortic endothelium,and then the endothelium disfunction may occur.

Objective To evaluate the anatomical and functional results of retinotomy in treatment of complicated retinal detachment. Methods Twenty three eyes were treated with retinectomy during vitrectomy for complicated retinal detachment with proliferative vitreoretinopathy when complete reattachment of retina was not obtained despite careful mambrane peeling. After released the peripheral vitreoretinal contraction or pulled subretinal membranes, perfluorocarbon liquid injection, laser retinopexy and silicone oil tamponade were performed. Retinotomy size ranged from 30 degree to 360 degree (average 132 degree). Results Retinal attachment were obtained in all of the operated eyes at the end of the operation. Silicone oil was removed from 15 eyes (65.0%) within 3～11 months postoperatively. After a minimum follow up of 6 months, the retinae were completely attached in 17 eyes ( silicone oil was not removed in 4 eyes ) and visual acuity of 0.02 or better was obtained in 11 eye (48.0%). Recurrent retinal detachment occurred in 2 eyes in which the silicone oil had been removed. The major complications were recurrence of the proliferation in 6 eyes (26.0%) and hypotony in 3 eyes (13.0%). Conclusion Retinotomy is beneficial to reattach the retina for eyes with advanced proliferative vitreoretinopathy in seemingly inoperable cases.

Objective To identify the risk factors for nosocomial sepsis in preterm infants.Methods A case-control study (1 ∶ 2) was conducted in 81 preterm infants with nosocomial sepsis and 162 preterm infants without nosocomial sepsis as age-matched controls (admission time was the most closely) hospitalized in Fujian Maternity and Children Hospital from January 1,2007 to December 31,2011.Data of preterm infants including maternal,delivery and neonatal records were collected.Risk factors for nosocomial sepsis were analyzed using t test,x2 test and multivariate Logistic regression.Results Nosocomial sepsis occurred in 81 preterm infants with an incidence rate of 1.50％ (81/5 392).Univariate analysis showed that the gestational age [(31.8 ±2.4)vs(33.8 ± 1.8)weeks,t=-7.260,P＜0.01] and birth weight [(1 545± 349) vs (2 174±465) g,t=-10.750,P＜0.01] of neonates with nosocomial sepsis were lower than those in the controls.Compared with the controls,the neonates with nosocomial sepsis had higher incidence of small for gestational age [27.2％ (22/81) vs 11.7％ (19/162)],multiple birth [35.8％ (29/81) vs 21.6％ (35/162)],neonatal asphyxia [19.8％(16/81)vs 8.6％(14/162)],admission to neonatal intensive care unit [81.5％(66/81) vs 49.4％ (80/162)],incubator usage [87.7％ (71/81) vs 29.0％ (47/162)],intracranial hemorrhage [27.2％ (22/81)vs 14.2％ (23/162)],noninvasive ventilation [35.8％ (29/81)vs 14.8％ (24/162)],feeding intolerance [64.2％ (52/81) vs 17.9％ (29/162)],using probiotics [65.4％ (53/81) vs 37.0％ (60/162)],duration of parenteral nutrition ＞7 days [77.8％ (63/81) vs 16.0％ (26/162)],combined administration of antibiotics [61.7％(50/81) vs 43.8％(71/162)],duration of antibiotics administration ＞7 days [65.4％(53/81) vs 9.3％ (15/162)],intravenous immunoglobulin [76.5％ (62/81) vs 46.9％ (76/162)] and central vena catheterization [16.0％ (13/81) vs 1.2％ (2/162)] (all P＜0.05).The Logistic regression analysis showed that low birth weight (OR=2.087,95％CI:1.074 4.057),duration of parenteral nutrition ＞7 days (OR=3.075,95％CI:1.158 8.164),feeding intolerance (OR-4.328,95％CI:1.776-10.544) and duration of antibiotic administration ＞7 days (OR=18.443,95％CI:5.084-66.913) were independent risk factors for nosocomial sepsis in preterm infants (all P＜0.05).Conclusions Preterm infants with low birth weight,long duration of parenteral nutrition,long-term antibiotic treatment and feeding intolerance have high risk for nosocomial sepsis.

Objective To explore the predicting value of serum cholyglycine (CG), determination of the blood flow of fetal umbilical artery (S/D), non-stress test (NST) results in the prognosis of the newborns. Methods Serum CG, S/D, NST results in 110 cases of intrahepatic cholestasis of pregnancy were determined by radioimmunoassay, color Doppler ultrasonic instrument, and fetal electronic wardship instrument, respectively. The delivery modes and postnatal Apgar scores were recorded. Results CG levels increased the incidence of abnormal S/D and NST in a dose-dependent manner (P

Objective To conduct a Meta-analysis to evaluate the efficacy and safety of interfer on-α for treating HBeAg-positive chronic hepatitis B in children.Methods PubMed and Chinese Biomedical Database were searched from the beginning to April 2006,and the references of eligible studies were manually screened.Randomized controlled trials published in the English and Chinese literature comparing interferon-α with non-antiviral interventions(placebo or no treatment)in children with chronic hepatitis B were eligible for inclusion.Studies were included if patients were treated for at least 3 months and followed up for at least 6 months after cessation of therapy.Two investigators independently assessed the quality and extracted the data.The methodological quality of trails was assessed by the Jadad-scale plus allocation concealment.Heterogeneity was examined by Chi-square test.Fixed effects model or random effects model was used to pool the data.Sensitivity analyses were used in the treatment course.Results Seven randomized controlled studies with a total of 360 child chronic hepatitis B virus carriers who were positive for hepatitis B surface antigen and hepatitis B e antigen werc identified.It was found by Meta-analysis that,compared with the control,at the end of therapy,interferon-α could significantly clear HBeAg[22.1%vs 6.7%,OR 3.56,95% CI(1.74, 7.28),P=0.000 5],HBV DNA[33.7% vs 12.6%,OR 3.50,95% CI(2.03,6.06),P＜0.01], HBsAg [6.5% vs 0.5%,OR 7.10,95% CI(1.52,33.12),P=0.01],and achieve HBeAg seroconversion [17.3% vs 2.9%,OR 5.62,95% CI(1.65,19.18),P=0.006],but was not more effective in HBsAg seroversion[2.0% vs 0,OR 3.55,95%CI(0.35,35.93),P=0.28]and alanine aminotransferase(ALT)normalization[24.2% vs 16.2%,OR 1.72,95% CI(0.84,3.52), P=0.14].Conclusions Interferon a may be efficacious in clearance of HBeAg,HBV DNA and HhsAg, and achievement of HBeAg seroversion.Little evidence is available on HBsAg seroversion and ALT normali zation.Rigorously designed large sample size randomized double blind clinical trials with large sample size are required to further confirm and support the conclusion.

BACKGROUND:Poly(3-hydroxybutyrate) is approved as its excel ent biocompatibility, biodegradability and piezoelectric properties, but there are also some deficiencies, such as high breakability and poor hydrophilicity. METHODS:Poly(3-hydroxybutyrate) was mixed with different mass percentages of nanohydroxyapatite (0, 10%, 20%and 30%) to prepare new composite fibrous scaffolds through electrospinning process. The microstructure, group composition, crystal ine phase distribution, thermal properties and surface wettability of the scaffolds were detected. RESULTS AND CONCLUSION:Under the scanning electron microscope, with the increase of nano-hydroxyapatite content, more and more nano-hydroxyapatite particles were distributed evenly on the composite fiber surface;the fiber surface was basical y covered with nano-hydroxyapatite particles at the content of 30%, and the roughness of the fiber surface also increased. Results from differential scanning calorimetry and X-ray diffraction showed that the nano-hydroxyapatite reduced the crystal inity of poly(3-hydroxybutyrate) and the crystal tacticity, and this phenomenon became more evident with the increase of nano-hydroxyapatite content. Additional y, the higher the content of nano-hydroxyapatite content, the lower the contact angle and the higher the hydrophily. These findings indicate that the nano-hydroxyapatite/poly(3-hydroxybutyrate) ultrafine-fibrous scaffold using electrospinning technology can effectively improve the surface wettability and crystal inity of the material as wel as the material hydrophily and brittleness, and the higher the content of nano-hydroxyapatite, the more obvious the effect.

Objective To investigate the value of extravascular lung water index(EVLWI) in assessment of prognosis of elderly patients with combined septic shock and pulmonary capillary leakage.Methods Totally 34 elderly patients with septic shock and pulmonary capillary leakage in our hospital from Jan.2011 to Dec.2012 were selected.Cardiac index (CI),global end diastolic volume index (GEDI),systemic vascular resistance index (SVRI),pulmonary vascular permeability index (PVPI) and EVLWI were detected by pulse-indicator continuous cardiac output (PiCCO) technology for 3 days.Based on the actual body weight (ABW) and predicted body weight (PBW),the actual extravascular lung water index and predicted extravascular lung water index were calculated.Peak airway pressure (Ppeak),plateau pressure (Pplat),mean airway pressure (Pm),tidal volume (VT),positive end expiratory pressure (PEEP),oxygen concentration (FiO2) and static lung compliance (Cst) were monitored,the arterial partial pressure of oxygen (PaO2) was detected by blood gas analysis,and the PaO2/FiO2 (P/F) and oxygenation index (OI) were calculated.Chest X-ray,lung injury score (LIS) were conducted.The correlations of EVLWI to actual body weight (EVLWIa) and predicted body weight(EVLWIp) with P/F,Cst and LIS were analyzed.The predictive value of EVLWIa and EVLWIp in the prognosis in elderly patients with septic shock and pulmonary capillary leakage was assessed.Results At day 1,non-survivors had higher levels of SOFA score and lactate level than survivors (both P＜0.05).However,these variables including SOFA score,LIS,PVPI,lactate level,fluid balance,norepinephrine level,EVLWIa and EVLWIp were higher and PaO2/FiO2 was lower in non-survivors than in the survivors at day 3 (all P＜0.05).EVLWIa and EVLWIp were positively correlated with LIS (r=0.461 and 0.588,both P＜0.05) and negatively correlated with PaO2/FiO2 (P/F) (r=-0.307 and-0.436,both P＜0.05).EVLWIa and EVLWIp had negatively correlations with Cst,but r=-0.141 and-0.154,both P＞0.05.Multiple logistic regression analysis showed that SOFA,EVLWa and EVLWp were independent predictive risk factors for mortality in elderly patients with septic shock and pulmonary capillary leakage.The areas under the receiver operating characteristic curve (ROC) of SOFA,EVLWIa and EVLWIp for predicting the prognosis were 0.769,0.832 and 0.855 respectively.With 11.96ml/kg as the cutoff point of EVLWIp,the sensitivity and specificity of EVLWIp predicting the survival of patients was 94.4％ and 61.5％ respectively.Conclusions Extravascular lung water can predict the prognosis and reflect the severity of lung injury in elderly patients with septic shock and puhnonary capillary leakage.Compared with EVLWIa,the EVLWIp has a better correlation with lung injury and a higher predictive value for survival.