Ya-Li Cao

Publications (4)2.47 Total impact

• Article: [Enriched experiment and endogenous processes of glycogen-accumulating organisms (GAOs)].

  Qi-Lin Wang, Xiao-Di Hao, Ya-Li Cao
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  ABSTRACT: Cell decay is an important part of microbiological endogenous processes, which consists of cell death (reduction in the amount of active bacteria) and activity decay (reduction in the specific activity of active bacteria). By means of measuring maximal anaerobic volatile fatty acid (VFA) uptake rates (VFAUR), analyzing 16S rRNA with fluorescence in-situ hybridization (FISH) and observing membrane integrity by live/dead staining, the aerobic decay characteristics of glycogen-accumulating organisms (GAOs) in an enriched GAOs sequencing batch reactor (SBR) system were investigated. It was experimentally identified that a highly enriched culture of GAOs (94%) was obtained by maintaining the temperature at 30 degrees C in the SBR and a high m (COD): m (P) at 100 in the feed. The experimental results and calculations revealed that the decay and death rates of GAOs were 0.132 d(-1) and 0.034 d(-1) respectively, which demonstrated that cell death and activity decay accounted for respective 26% and 74% of the total GAOs cell decay. For this reason, cell death was only a minor factor causing the cell decay of GAOs, and activity decay was mostly responsible for this process.
  Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 04/2011; 32(4):1034-41.
• Article: [Experimental determination of bacterial decay characteristics in biological wastewater treatment system].

  Xiao-Di Hao, Jing-Yi Zhu, Xiu-Qin Cao, Ya-Li Cao
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  ABSTRACT: The characteristics of cell decay in biological wastewater treatment systems were investigated under aerobic condition, by measuring the decay rate and by determining the death rate with LIVE/DEAD dyeing experiments. It was found that cell decay in biological wastewater treatment systems can be actually described as two parts: decay caused by cell death and decay derived from activity decrease. The experimental results revealed that 60% of cell decay in a nitrifying system was caused by activity decrease and 40% was caused by cell death. In a heterotrophic system, however, activity decrease was responsible for 80% of cell decay, and the other cell decay for 20% was caused by cell death.
  Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 12/2008; 29(11):3104-9.
• Article: [Experimental study on the effect of COD/P ratios and phosphate recovery on a BNR system].

  Xiao-Di Hao, Ji Dai, Yuan-Sheng Hu, Ya-Li Cao
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  ABSTRACT: Based on a BNR system--BCFS, the effect of COD/P and phosphate recovery on the BCFS process was experimentally investigated. The results indicate that a higher P-removal efficiency (87%) and a good P-effluent quality (< or = 0.8 mg x L(-1)) could be maintained at COD/P ratios higher than 24. When COD/P was reduced below 24, the P-removal efficiency was suddenly decreased down to 62% and the P-effluent went up to 5 mg x L(-1). Under the circumstance, chemical phosphate recovery in the side-stream of anaerobic supernatant was combined with bio-P removal. When the side-stream increased up to 30%, the P-effluent went back to < 1 mg x L(-1), with a corresponding phosphate recovery efficiency of 54%.
  Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 11/2008; 29(11):3098-103.
• Article: Hepatitis B viral infection in maintenance hemodialysis patients: a three year follow-up.

  Ya-Li Cao, Shi-Xiang Wang, Zuo-Min Zhu
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  ABSTRACT: To observe the prevalence of hepatitis B virus (HBV) infection in maintenance hemodialysis patients. Eighty-eight hemodialysis patients who had been receiving hemodialysis regularly for an average of 39.45 +/- 7.57 (range from 36 to 49) mo were enrolled in this study. HBV markers were measured in these patients before hemodialysis and in 100 healthy controls by the chemiluminescent microparticle immunoassay (CMI) method in order to compare the incidence of HBV infection in hemodialysis patients versus normal healthy people. All patients were then divided into two groups: patients positive for HBV markers (i.e. those positive for HBsAg, anti-HBc, HBeAg, anti-HBe, with or without positive anti-HBs) (n = 33), and patients negative for HBV markers (including those only positive anti-HBs) (n = 55). The following information was obtained for all patients: socio-demographic data, number of blood transfusions and some laboratory investigations. After 39.45 +/- 7.57 mo follow-up, HBV markers were measured in these patients by CMI. The incidence of HBV infection in maintenance hemodialysis patients was 37.5%, which was higher than in controls (9%). In the patients positive for HBV markers, there were 13 patients (39.4%) who had a history of blood transfusion, which was more than the number [12 (21.8%), P = 0.04] of patients negative for HBV markers. Eight of the 88 patients negative for HBV markers turned out to be positive, while three of the 33 patients positive for HBV markers turned out to be negative. There was no cirrhosis of the liver or hepatoma occurring in these patients. Maintenance hemodialysis patients have a higher risk of HBV infection than the average population. The number of blood transfusions is associated with an increased prevalence of HBV. While it is hard for hemodialysis patients to eliminate HBV, the prognosis of patients with positive HBV markers is good.
  World Journal of Gastroenterology 01/2008; 13(45):6037-40. · 2.47 Impact Factor