Objective To observe the removal of Cr(Ⅵ) and effects of some factors in solution on Cr(Ⅵ) with zero valent iron(ZVI).Methods A certain amount ZVI were added in a 50 ml solution with Cr(Ⅵ),the effects on removal ratio were observed when the initial Cr(Ⅵ) concentration was 5,10,20 and 30 mg / L,temperatures was 5,15,25 and 35 ℃,the ZVI dosage was 0.25,0.5,0.75,1.0,1.25 and 1.50 g and anions such as Cl-,NO3-,SO42-,CO32-and PO43-.The removal ratio of Cr(Ⅵ) was evaluated by Cr(Ⅵ) concentration difference pre and post-treatment with ZVI.Results Cr(Ⅵ) could be removed effectively with ZVI and removal ratio of Cr(Ⅵ) could reach over 90% in 5 min,the Cr(Ⅵ) concentration of the solution could meet the requirement of GB5749-2006 Sanitary Standard for Drinking Water Quality [ Cr(Ⅵ) concentration≤0.05 mg/L].The best reaction conditions was 35 ℃,pH=2,dosage of ZVI =1.0 g.Conclusion Cr(Ⅵ) can be removed by ZVI in solution,the removal ratio can be impacted by some factors such as pH value,Cr(Ⅵ) initial concentration,temperature.

Objective: To investigate the acidogenicity and aciduric ability of Streptococcus mutans isolated from the children with different caries susceptibility.Methods: The acidogenic and aciduric ability of Streptococcus mutans strains isolated from children was investigated.Acidogenicity ability was compared among high caries-susceptible group,middle caries-susceptible group and caries-free group.Results: The acidogenicity and aciduric ability of Streptococcus mutans isolated from the high caries-susceptible children and middle caries-susceptible group were significantly higher than that isolated from caries-free group(P

Objective: To investigate the inhibitory effect of Flu or Protector on the demineralization of bovine enamel caused by some beverages. Methods: Forty bovine teeth were equally divided into experimental and control groups, each of them were subdivided into two groups. The enamel sp ecimens of the experimental group were pretreated with Fluor Protector and then exposed to carbonated drinks and fruit juice respectively,the enamel specimens o f control group were exposed to beverages directly. All the enamel specimens wer e exposed to beverages 5 times a day and for 5 minutes each time. After 7- day exposure,the concentration of calcium and phosphate in the beverages were measu red by EL 312e Micro-Plate. Results: The concentration of calci um and phosphate in the corresponding beverage of experimental group was lower t han that in control group in the same expossure time(P0.05).Conclusions: Fluor Protector can inhibit the demineralization of bovin e enamel caused by beverages.The inhibitory effect of Fluor Protector decreases as the exposure time prolonges.

Objective To investigate the quantity of formaldehyde released by artificial wood-based boards sold in Lanzhou. Methods Formaldehyde quantity released by three kinds of artificial wood-based boards(42 samples) were determined with desiccator method. Results Among 42 samples, 9 artificial wood-based boards were E1-level (21.4%), 20 E2-level (47.6%), the others disqualification (31%). A significant difference (0.01

0.05). The average amount of ammonia emission was 0.012%, 0.024% and 0.081% at pH values of 9, 11 and 13 respectively. Ammonia emission increased with the increasing pH values, especially for those admixtures containing carboxylate. Conclusion Ammonia emission from concrete admixtures sold in Lanzhou exceed the standard in different degree.Higher pH value may accelerate the ammonia emission from concrete admixtures and cause higher concentration of ammonia in indoor air.

Objective To explore the effects of temperature and relative humidity on radon exhalation rate of glazed tile in the hermetic environment. Methods Ordinary glazed tile was used as experimental object to detect radon concentration with Model 1027 continuous radon monitor in a 0.25 m3 simulation chamber at different temperature and humidity,and then calculated the radon exhalation rate. Results In reasonable range,a cubic correlation between radon exhalation rate(ER) and relative humidity(RH) expressed as ER=0.000 2RH3-0.040 2RH2+2.623 9RH-32.303(R2=0.986 6)was found; a cubic function relationship between radon exhalation rate(ER) and temperature(t) expressed as ER=-0.022 5t3+2.016 5t2-58.748t+565.05(R2=0.969 8)was also observed. Conclusion Environmental temperature and relative humidity have great effects on radon exhalation rate of glazed tile.

Objective To summarize the experience of great saphenous vein (GSV) harvesting using multiple interrupted cutaneous incisions and retrospectively compare the clinical results with those using traditional single long incision. Methods One hundred and forty-nine patients for initial elective coronary artery bypass grafting underwent GSV harvesting by either interrupted incisions (Group A, n=108) between August 2004 to October 2005 or traditional technique (Group B, n=41) between February 2004 and July 2004, respectively. The Length of GSV harvested, total incision length, time of harvesting, and complication rate were compared between the two groups. Results There were no statistical differences in the age, sex, length of GSV harvested, and macroscopic GSV quality between the two groups. Short- or long-term complications relating to the quality of venous grafts occurred in neither groups. As compared with the Group B, the Group A presented significantly longer time for GSV harvesting (49.3?6.6 min vs 29.1?5.4 min; t=17.490, P=0.000), shorter incision length (17.8?3.2 cm vs 43.1?4.9 cm; t=-36.878, P=0.000), and lower wound-related complication rate [9.3% (10/108) vs 22.0% (9/41); ?2=4.303, P=0.038]. The time for donor site manipulation was slightly increased in the Group A (62.4?8.7 min vs 59.8?6.9 min; t=1.718, P=0.088). Conclusions GSV harvesting using multiple interrupted incisions requires more complicated and difficult techniques than using a single long incision, but it is less invasive and produces superior patient satisfaction and better cosmetic outcomes.

To investigate the effect of casein phosphopeptide-amorphic calcium phosphate(CPP-ACP) on the growth of Lactobacillus fermentum and to evaluate the possibility of CPP-ACP as a biological anticariogenic agent. Lactobacillus fermentum was inoculated in BHI with different concentrations of CPP-ACP and grew in anaerobic condition at 37 ℃ for 48 h. Used MTT method to evaluate the effects of CPP-ACP on the growth of Lactobacillus fermentum. CPP-ACP inhibited the growth of Lactobacillus fermentum effectively. With the concentration of CPP-ACP increasing, the values of A(550 nm) decreased. It was found that CPP-ACP had inhibitory effect on the growth of Lactobacillus fermentum, the inhibitory effect increased with CPP-ACP concentration.

Objective:To compare the expression and biological activity of glucosyl transferases (GTFs)of Streptococcus mutans (S.mutans)under normal outside environment between high temperature requirment serine proteinase A(HtrA)-deficient strains and high virulent strains isolated from children with high cario-susceptibility.Methods:The HtrA-deficient strains and high virulent strains of S.mutans were obtained by preliminary study.The strains were reanimated and incubated in BHI medium to exponential phase at tenth hour.The expression of gtfB,gtfC and gtfD were detected by real-time RT-PCR.The biological activity of the GTFs were detected by entong sulfuric acid method and Western Blot.Results:The expression of gtfs and GTFs in the HtrA-deficient strains was higher than those of high virulent strains,but the biological activity of the GTFs was lower.Conclusion:The HtrA gene plays an important regulatory role in the process of the GTFs expression of S.mutans isolated from children with high cario-susceptibility.

Objective To summarize the treatment of 10 aortic coarctation cases ,who receive the surgery from ascending aorta to thoracic descending aorta with the prosthetic graft, discuss the valuable and appliable of this method. Methods Cardiac surgery, Chinese Acdemy of Medical Sciences, Peking Union Medical College Hospital department treated 10 patients who got the aortic coarctation from Jan. 2006 to Dec. 2015 Seven male patients and 3 cases of female patients consist of the sample, aged from 14 to 35 years old, the median age was 27. One cases consolidated aortic valve deformity and aortic root expansion, the others were simple aortic coarctation. Their upper limbs blood pressure was 20 mmHg higher compared with the low limb. Meanwhile, there was no sign of surgery contraindication. Ten cases received this operation under cardiopulmonary bypass situation. And the patient who consolidate aortic valve deformity and aortic root expansion receive the Bentall surgery at the same time. Results There was no death during perioperative time, no spinal cord ischemic and other serious complications. Those patients went back to outpatient department after discharging from hospital 3 to 6 months. The differential pressure between upperlimbs and low limbs were less than 20 mmHg, and the CTA results indicated no aneurysms. Conclusion Using artificial blood vessels to make a graft from the ascending aorta to the descending aorta is an effective method for treatment of thoracic aorta.