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Search Results: 1 - 10 of 33014 matches for " DAI Xing-chun "
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Experimental Study on the Processes and Mechanism of Enhanced Denitrification by Addition Zeolite in Wastewater Treatment

DAI Xing-chun,HUANG Min-sheng,XU Ya-tong,XIE Bing,

环境科学 , 2007,
Abstract: Aim to enhanced nitrogen removal from wastewater by addition zeolite to aeration tank, The result showed that addition of zeolite could improve the nitrification/denitrification efficiencies by comparing two phase experiment of 25mg/L with blank and 25mg/L with 50 mg/L. and the population of nitrifying bacteria in activated sludge increased obviously. When 25mg/L zeolite was added into aeration tank, NH4+-N and TN removal increased 10~13% and 13% respectively, endogenous respiration rate of nitrification increased about 138%,and the population of nitrification bacteria increased about 2.2 folds; But the nitrogen removal and endogenous respiration rate of 50 mg/L enhanced indistinct comparing with 25 mg/L. These results indicated that NH4+ ion-exchange and accumulation to the interior/outer surfaces of zeolite, co-existence of aerobic and anoxic micro-environments were responsible for the enhanced denitrifying function.
Experimental Study on the Processes and Mechanism of Enhanced Denitrification by Addition Zeolite in Wastewater Treatment

DAI Xing-chun,HUANG Min-sheng,XU Ya-tong,XIE Bing,

环境科学 , 2007,
Abstract: Aim to control the emission of SO2 during coal combustion, desulfurization characteristic of organic calcium was studied by intelligent sulfur determination analyzer. Sulfur releasing curve changed from two "peak value" to one for addition of organic calcium, with velocity of SO2 release decreasing. Efficiency of sulfur reduction was double when organic calcium was used under 1 000 degrees C compared to limestone, and reduction efficiency of calcium magnesium acetate was 73.84%. Sulfur content, furnace temperature, calcium/sulfur ratio and paticle's diameter were important factors as for desulfurizing rate. Sulfur removal efficiency was improved with coal's sulfur content increasing or particle's diameter decreasing. Decreasing degree of reduction efficiency lowered with sulfur content increasing as temperature improved. Efficiency remained high level as 59.08% by calcium magnesium acetate at 1 200 degrees C. Perfect efficiency could be reached as calcium/sulfur ratio being one and augmentation degree was inapparent with more calcium addition. Therefore organic calciums are excellent absorbent for desulfurization and calcium magnesium acetate has best sulfur removal efficiency.
Evaluation of the Damaging Effect of Dyestuff on Phanerochaete chrysosporium with Amplified Fragment Length Polymorphism (AFLP) Analysis

DAI Xing-chun,WU Lin-hui,WU Lin-lin,HUANG Min-sheng,

环境科学 , 2008,
Abstract: The AFLP analysis was carried out in order to evaluate the DNA damaging effects of dyestuff of different concentrations on Phanerochaete chrysosporium. The DNA similarity and UPGMA cluster analysis were conducted to determine the relationships between the concentrations of dyestuff and DNA damaging effects. The results showed that the AFLP analysis could reflect the polymorphisms of DNA well, and the primer pairs E-AAC/M-CAA could give more amplified DNA fragments than others primers. From the DNA maps of best primer pairs, 35 clear and stable DNA bands were observed, including 12 polymorphous bands which were accounted for 34.3% diversity. It was indicated from the DNA similarity and UPGMA cluster analysis that DNA polymorphisms correlated with dyestuffs concentrations well. If the concentration of dyestuff was not higher than 50 mg/L, the damaging effect on DNA was finite. If the concentrations of dyestuff were up to 300 mg/L, the DNA of Phanerochaete chrysosporium would have been injured greatly, and would have been bankrupted in its intrinsic function.
Relation Analysis of Phosphorus Removal and BOD5 Loading Using PHB Monitoring in A2/O Process

GAO Shang,DAI Xing-chun,CHEN Xi,GAO Yan,ZHU Yong,HUANG Yan,HUANG Min-sheng,WANG Guo-hua,

环境科学 , 2008,
Abstract: 以上海市白龙港城市污水厂初沉池污水为进水,培养驯化污泥并构建A2/O试验系统,监测PHB消耗、生成的动态变化,并分析其与除磷和BOD5负荷率的耦合关系.结果显示,曝气池中PHB的消耗与除磷呈现良好的正相关关系(p<0.05),平均消耗约140 mg左右的PHB可去除1 mg P;厌氧池中PHB的生成与释磷存在着极显著的正相关关系(p<0.01),平均释放1.17 mg的磷可生成约100 mg的PHB;厌氧池中PHB的含量与系统F/M的正相关性显著(p<0.05),负荷为0.176 g/(g·d)较负荷0.413 g/(g·d)下PHB的生成量平均减少约4 mg/g(以MLSS计);PHB的合成与厌氧池中BOD5的去除量的相关性较差(p>0.05),但与温度呈极为显著的正相关关系(p<0.01),温度的升高有助于微生物合成PHB,最高温度(33.2℃)比最低温度(17.1℃)活性污泥中PHB含量约增加5 mg/g(以MLSS计),占总量的20%左右.
Influences of combination of biological pretreatment with liquid hot water pretreatment on chemical components and enzymatic hydrolysis of Populus tomentosa

WANG Wei,LI Xing-Chun,CUI Bao-Kai,

微生物学通报 , 2012,
Abstract: Objective] Enhance the efficiency of fungal pretreatment and lower the severity of liquid hot water (LHW) pretreatment. Methods] Combinations of white rot fungi and LHW were employed to pretreat Populus tomentosa, the influences of this combined pretreatments on the chemical components and enzymatic hydrolysis of P. tomentosa were studied. Results] The highest hemicellulose removal of 70.70% was observed by combination of Lenzites betulinus C5617 with LHW pretreatment. Celluloses were degraded in both step of the combined pretreatments, combination of L. betulinus C5617 with LHW caused the highest cellulose loss of 29.62%. Lignin loss happened mostly in the step of fungal pretreatment, and L. betulinus C5617 caused a higher degradation (16.98%) of acid insoluble lignin among the two fungi. The combined pretreatments improved the enzymatic hydrolysis of P. tomentosa significantly. Compared with sole LHW treatment, combination of L. betulinus C5617 with LHW pretreatment resulted in an increase by 20.60%, and an increase (12.23%) of reducing sugar yield were obtained by combination of P. sanguineus D9497 with LHW treatment. Conclusion] This combined pretreatment can lower the severity of LHW pretreatment and was cost-effective.
Development and application of immunoassay in pesticide residue analysis

WANG Wen-Jun,LIU Xing-Chun,LI Ji,

中国生态农业学报 , 2007,
Abstract: This article reviews technical development of antibody and antigen preparation and application methods of a handful of major immunoassay(radioimmunoassay,enzyme immunoassay,fluorescence immunoassay,chemiluminescence immunoassay,etc.)in the analysis of pesticide residues.With special emphasis on new formats developed in recent years,including coupled immunoassay and chromatography technique,a new tendency of trace analyses is introduced in detail.Underlying problems in the application of immunoassay are highlighted and future trends of immunoassay development postulated.
QTL mapping in controlling seedling cold tolerance in rice (Oryza sativa L.)

WU Xing-Chun,WANG Yin,LIN Wen-Xiong,
,王 茵,林文雄

中国生态农业学报 , 2008,
Abstract: 水稻的低温冷害是世界性问题,在日本、韩国、美国和中国等大部分高纬度、高海拔地区尤为突出,是影响粮食产量的主要因素之一。25~35℃是水稻幼苗生长的适宜温度,但中国南方早稻播种后,幼苗生长期的温度一般低于20℃,尤其遇上3月、4月的倒春寒天气后,往往导致秧苗黄叶、生长迟缓,
Histogram Modification Methods Without Image Details Losing

CAO Ju-liang,LU Hai-bao,TAN Xiao-bo,CHU Xing-chun,CAO Ju-liang,LU Hai-bao,TAN Xiao-bo,CHU Xing-chun,CAO Ju-liang,LU Hai-bao,TAN Xiao-bo,CHU Xing-chun,CAO Ju-liang,LU Hai-bao,TAN Xiao-bo,CHU Xing-chun,

中国图象图形学报 , 2004,
Abstract: The problem of gray level incorporation during image histogram modification is analyzed in the paper. And two histogram modification methods which can prevent image details losing are presented. One is addressed by expanding the gray-level range of image, so less gray levels are integrated and more details of the image can be hold. The other method is realized by modifying local gray level. According to the method, the image's histogram is modified by way of general histogram modification method firstly. Then the gradient of modified image and original image is calculated and compared. The pixels whose gradient decreased markedly are found. And their gray levels are modified according to the gradient of the original image finally. So the details lost during histogram modification can be resumed. Both the methods can enhance the image contrast and hold the details simultaneously. Further more, the proposed approach is simple and easy to be performed. Experimental results are given at the end of the paper. Four images are adopted to demonstrate the performance of the methods.
Improved GA-FCM and Its Application in Traffic Data Mining

YANG Xing-Chun,WANG Gang,ZHANG An-Ni,

计算机系统应用 , 2010,
Abstract: With the continual advanvement of Information Construction in Public Security, it is important to boost the direction and the validity of police work and improve the level of Information Construction, if interested information can be mined from the large amount of historical data. Based on an earlier study, this paper improves the GA-FCM from the population selection and the mutation operator. Finally, the improved algorithm is also applied to the traffic accident data mining. The results have shown that the algorihm contributes significantly in preventing traffic accident and improving the traffic situation.
Strong Inhibition of Celastrol Towards UDP-Glucuronosyl Transferase (UGT) 1A6 and 2B7 Indicating Potential Risk of UGT-Based Herb-Drug Interaction
Yong-Sheng Zhang,Yan-Yang Tu,Xing-Chun Gao,Jun Yuan,Gang Li,Liang Wang,Jian-Ping Deng,Qi Wang,Ru-Meng Ma
Molecules , 2012, DOI: 10.3390/molecules17066832
Abstract: Celastrol, a quinone methide triterpene isolated from Tripterygium wilfordii Hook F., has various biochemical and pharmacological activities, and is now being developed as a promising anti-tumor agent. Inhibitory activity of compounds towards UDP-glucuronosyltransferase (UGT) is an important cause of clinical drug-drug interactions and herb-drug interactions. The aim of the present study is to investigate the inhibition of celastrol towards two important UDP-glucuronosyltransferase (UGT) isoforms UGT1A6 and UGT2B7. Recombinant UGT isoforms and non-specific substrate 4-methylumbelliferone (4-MU) were used. The results showed that celastrol strongly inhibited the UGT1A6 and 2B7-mediated 4-MU glucuronidation reaction, with 0.9 ± 0.1% and 1.8 ± 0.2% residual 4-MU glucuronidation activity at 100 μM of celastrol, respectively. Furthermore, inhibition kinetic study (Dixon plot and Lineweaver-Burk plot) demonstrated that celastrol noncompetitively inhibited the UGT1A1-mediated 4-MU glucuronidation, and competitively inhibited UGT2B7-catalyzed 4-MU glucuronidation. The inhibition kinetic parameters (Ki) were calculated to be 0.49 μM and 0.045 μM for UGT1A6 and UGT2B7, respectively. At the therapeutic concentration of celastrol for anti-tumor utilization, the possibility of celastrol-drug interaction and celastrol-containing herbs-drug interaction were strongly indicated. However, given the complicated nature of herbs, these results should be viewed with more caution.
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