ABSTRACT
A microbial fuel cell (MFC)-based microbial electrochemical sensor was developed for real-time on-line monitoring of heavy metals in water environment. The microbial electrochemical sensor was constructed with staggered flow distribution method to optimize the parameters such as external resistance value and external circulation rate. The inhibition of concentration of simulated heavy metal wastewater on voltage under optimal parameters was analyzed. The results showed that the best performance of MFC electrochemical sensor was achieved when the external resistance value was 130 Ω and the external circulation rate was 1.0 mL/min. In this case, the microbial electrochemical sensors were responsive to 1-10 mg/L Cu2+, 0.25-1.25 mg/L Cd2+, 0.25-1.25 mg/L Cr6+ and 0.25-1.00 mg/L Hg2+ within 60 minutes. The maximum rejection rates of the output voltage were 92.95%, 73.11%, 82.76% and 75.80%, respectively, and the linear correlation coefficients were all greater than 0.95. In addition, the microbial electrochemical sensor showed a good biological reproducibility. The good performance for detecting heavy metals by the newly developed microbial electrochemical sensor may facilitate the real-time on-line monitoring of heavy metals in water environment.
Subject(s)
Bioelectric Energy Sources , Electrodes , Metals, Heavy/analysis , Reproducibility of Results , Wastewater , WaterABSTRACT
Objective To compare the effects of different hemodialysis methods on vitamin K2and abdomi-nal aortic calcification.Methods From January 2016 to June 2017,collect 60 maintenance hemodialysis(MHD) patients in the First Affiliated Hospital of Shihezi University,including low flux hemodialysis(HD)patients with 30 cases and high flux hemodialysis(HFHD)patients with 30 cases.Selecting 30 cases as healthy group and con-trol group with similar sex and age.Blood biochemical detection of serum calcium,phosphorus,magnesium,albu-min,parathyroid hormone and other indicators were deternmined.Detecting the abdominal aortic calcification score calculation with abdominal lateral X-ray.Detecting serum vitamin K2levels in the three groups with ELISA.Further analyzing the correlation between vitamin K2levels and abdominal aortic calcium integration. Results Firstly, compared with the control group,vitamin K2levels in group HD and group HFHD were decreased(P<0.05).Vi-tamin K2levels in group HD were lower than those in group HFHD(P<0.05).Secondly,the score of abdominal aorta calcification in group HD was higher than that in group HFHD(P<0.05).Thirdly,levels of vitamin K2and abdominal aortic calcification score were negatively correlated(r =-0.319,P < 0.05),and 25(OH)VD3,calci-um,phosphorus,magnesium,calcium and phosphorus product,parathyroid hormone had no correlation(P >0.05). Conclusion In MHD patients,the level of vitamin K2in HFHD group is higher than that in HD group, the abdominal aortic calcification score is lower than that of HD group,and vitamin K2can delay the process of vas-cular calcification.
ABSTRACT
The bed rest has been considered essentialfor the conventional treatment ot acute hepatitis. Previously, it was thought that earlieractivity would prolorng the disease course and exaggerat the disease. The patients should not be allowed to perform physical activity until live -function recoveryed. But clinical practice indicated appropriate exercise can improve immune function the aute hepatitis patients who erformedthe exercise had shorter disease course ,ther quicker recovery of physical strength and they showed trends in recovery of liver function thepatientients who didn perform exercise show no ehanges. Therefore , we considered appropriate exercise therapy is very essential for the treat-ment of acute hepatitis. Exercise should be recognized as an equally impo rtant treatment modality of the infectious hepatitis.