目的:应用不同龈壁处理方式及成形系统对龈下深龋行邻面边缘提升术,观察充填后对牙周探诊出血的影响,为龈下深龋充填提供参考。方法:将36例龈下深龋病例分别采用排龈术、电刀切龈术、翻瓣术,将龈下缺损提升至龈上,完成复合树脂直接充填...目的:应用不同龈壁处理方式及成形系统对龈下深龋行邻面边缘提升术,观察充填后对牙周探诊出血的影响,为龈下深龋充填提供参考。方法:将36例龈下深龋病例分别采用排龈术、电刀切龈术、翻瓣术,将龈下缺损提升至龈上,完成复合树脂直接充填。术后3个月复查牙周探诊出血(bleeding on probing,BOP)。通过单因素分析及最优标度初步判断性别、年龄、牙齿类型、成形片种类、牙髓活力、处理方式对BOP的影响,建立非条件Logistic回归模型筛选影响BOP的因素。结果:成形片种类影响BOP(P=0.009),个性化修剪的Ivory型成形片比分段式成形片的探诊出血率高。年龄、性别、牙齿类型、牙髓活力及处理方式对BOP均无显著影响(P>0.05)。结论:成形片种类影响BOP,排龈术、电刀切龈术、翻瓣术3种龈壁暴露技术未对BOP造成明显影响。展开更多
All previously reported bacterial species which are capable of lysing harmful algae have been isolated from coastal environments in which harmful algae blooms have occurred. Due to the low concentration of alga-lysing...All previously reported bacterial species which are capable of lysing harmful algae have been isolated from coastal environments in which harmful algae blooms have occurred. Due to the low concentration of alga-lysing bacteria in an algal bloom, it is difficult to isolate the alga-lysing bacteria by existing methods. In this paper, two algae-lysing bacterial strains, P01 and P03, have been isolated from a biosystem immobilized on a sponge that was highly effective in removing algae and microcystins. Their lysing modes and effects on Microcystis aeruginosa have been studied. The results show that the degradation processes of these two strains for M. aeruginosa accorded with a first-order reaction model when the chlorophylla concentration was in the range from 0 to 1000 μgL-1. The degradation rate constants were 0.1067, 0.1274 and 0.2792 for P01 and0.0683, 0.0744 and 0.028 97 for P03, when the bacterial densities were 8.6 × 105, 8.6 × 106 and 8.6 × 107cells mL-1 respectively. Moreover, the two bacterial strains had favourable lytic effects not only on M. aeruginosa , but also on Chlorella and Scene-desmus. Their lytic effect on M. aeruginosa did not require physical cell to cell contact, but proceeded by the production of an extracellular product. The bacterial strains were identified as Bacillus species by PCR amplification of the 16S rRNA gene, BLAST analysis, and comparison with sequences in the GenBank nucleotide database.展开更多
In this study, sponges were used to immobilize domesticated sludge microbes in a limited space, forming an immobilized biosystem capable of algae and microcystins removal. The removal effects on algae, microcystins an...In this study, sponges were used to immobilize domesticated sludge microbes in a limited space, forming an immobilized biosystem capable of algae and microcystins removal. The removal effects on algae, microcystins and UV 260 of this biosystem and the mechanism of algae removal were studied. The results showed that active sludge from sewage treatment plants was able to remove algae from a eutrophic lake’s water after 7 d of domestication. The removal efficiency for algae, organic matter and microcystins increased when the domesticated sludge was immobilized on sponges. When the hydraulic retention time (HRT) was 5 h, the removal rates of algae, microcystins and UV 260 were 90%, 94.17% and 84%, respectively.The immobilized biosystem consisted mostly of bacteria, the Ciliata and Sarcodina protozoans and the Rotifer metazoans. Algal decomposition by zoogloea bacteria and preying by microcreatures were the two main modes of algal removal, which occurred in two steps: first, absorption by the zoogloea; second, decomposition by the zoogloea bacteria and the predacity of the microcreatures.展开更多
以聚氯乙烯(PVC)、再生PVC/聚偏氯乙烯(PVDC)为基体,加入三氧化二锑(Sb2O3)、氯化石蜡-70阻燃剂,钙锌复合稳定剂,氯化聚乙烯(CPE)增韧剂,硬脂酸、硬脂酸锌、石蜡润滑剂,对苯二甲酸二辛酯(DOTP)增塑剂,碳酸钙填充剂,钛白粉着色剂制备了...以聚氯乙烯(PVC)、再生PVC/聚偏氯乙烯(PVDC)为基体,加入三氧化二锑(Sb2O3)、氯化石蜡-70阻燃剂,钙锌复合稳定剂,氯化聚乙烯(CPE)增韧剂,硬脂酸、硬脂酸锌、石蜡润滑剂,对苯二甲酸二辛酯(DOTP)增塑剂,碳酸钙填充剂,钛白粉着色剂制备了绝缘电工套管材料。通过研究各组分对绝缘电工套管材料性能的影响,确立了绝缘电工套管材料配方。测试结果表明:该绝缘电工套管材料的冲击强度为75.9 k J/m2,拉伸强度为18.9 MPa,断裂伸长率为13.1%,体积电阻为3.69×1010Ω,氧指数为46.8%。展开更多
文摘目的:应用不同龈壁处理方式及成形系统对龈下深龋行邻面边缘提升术,观察充填后对牙周探诊出血的影响,为龈下深龋充填提供参考。方法:将36例龈下深龋病例分别采用排龈术、电刀切龈术、翻瓣术,将龈下缺损提升至龈上,完成复合树脂直接充填。术后3个月复查牙周探诊出血(bleeding on probing,BOP)。通过单因素分析及最优标度初步判断性别、年龄、牙齿类型、成形片种类、牙髓活力、处理方式对BOP的影响,建立非条件Logistic回归模型筛选影响BOP的因素。结果:成形片种类影响BOP(P=0.009),个性化修剪的Ivory型成形片比分段式成形片的探诊出血率高。年龄、性别、牙齿类型、牙髓活力及处理方式对BOP均无显著影响(P>0.05)。结论:成形片种类影响BOP,排龈术、电刀切龈术、翻瓣术3种龈壁暴露技术未对BOP造成明显影响。
基金This study was supported by the Sino Japan Science Cooperative Program （Grant No.003250103） Special Funds for PhD Research Station of University （Grant No. 20020422045）Science Foundation of Shandong Province （Grant No. Z2003B01 ）.
文摘All previously reported bacterial species which are capable of lysing harmful algae have been isolated from coastal environments in which harmful algae blooms have occurred. Due to the low concentration of alga-lysing bacteria in an algal bloom, it is difficult to isolate the alga-lysing bacteria by existing methods. In this paper, two algae-lysing bacterial strains, P01 and P03, have been isolated from a biosystem immobilized on a sponge that was highly effective in removing algae and microcystins. Their lysing modes and effects on Microcystis aeruginosa have been studied. The results show that the degradation processes of these two strains for M. aeruginosa accorded with a first-order reaction model when the chlorophylla concentration was in the range from 0 to 1000 μgL-1. The degradation rate constants were 0.1067, 0.1274 and 0.2792 for P01 and0.0683, 0.0744 and 0.028 97 for P03, when the bacterial densities were 8.6 × 105, 8.6 × 106 and 8.6 × 107cells mL-1 respectively. Moreover, the two bacterial strains had favourable lytic effects not only on M. aeruginosa , but also on Chlorella and Scene-desmus. Their lytic effect on M. aeruginosa did not require physical cell to cell contact, but proceeded by the production of an extracellular product. The bacterial strains were identified as Bacillus species by PCR amplification of the 16S rRNA gene, BLAST analysis, and comparison with sequences in the GenBank nucleotide database.
文摘In this study, sponges were used to immobilize domesticated sludge microbes in a limited space, forming an immobilized biosystem capable of algae and microcystins removal. The removal effects on algae, microcystins and UV 260 of this biosystem and the mechanism of algae removal were studied. The results showed that active sludge from sewage treatment plants was able to remove algae from a eutrophic lake’s water after 7 d of domestication. The removal efficiency for algae, organic matter and microcystins increased when the domesticated sludge was immobilized on sponges. When the hydraulic retention time (HRT) was 5 h, the removal rates of algae, microcystins and UV 260 were 90%, 94.17% and 84%, respectively.The immobilized biosystem consisted mostly of bacteria, the Ciliata and Sarcodina protozoans and the Rotifer metazoans. Algal decomposition by zoogloea bacteria and preying by microcreatures were the two main modes of algal removal, which occurred in two steps: first, absorption by the zoogloea; second, decomposition by the zoogloea bacteria and the predacity of the microcreatures.
文摘以聚氯乙烯(PVC)、再生PVC/聚偏氯乙烯(PVDC)为基体,加入三氧化二锑(Sb2O3)、氯化石蜡-70阻燃剂,钙锌复合稳定剂,氯化聚乙烯(CPE)增韧剂,硬脂酸、硬脂酸锌、石蜡润滑剂,对苯二甲酸二辛酯(DOTP)增塑剂,碳酸钙填充剂,钛白粉着色剂制备了绝缘电工套管材料。通过研究各组分对绝缘电工套管材料性能的影响,确立了绝缘电工套管材料配方。测试结果表明:该绝缘电工套管材料的冲击强度为75.9 k J/m2,拉伸强度为18.9 MPa,断裂伸长率为13.1%,体积电阻为3.69×1010Ω,氧指数为46.8%。
