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Search Results: 1 - 10 of 450279 matches for " X.M Wu "
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Effects of adsorption on degradation and bioavailability of metolachlor in soil
X.M Wu,M Li,Y.H Long,R.X Liu
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: The ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. The present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. Metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 μg1-n mLn g-1, suggesting its potential to move downward with percolating water. Adsorption followed a Freundlich isotherm and was positively correlated with soil organic matter (OM) content (p < 0.01). Degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil OM content (p < 0.01). The prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. Uptake and bioaccumulation of metolachlor in soils by Eisenia foetida was also mainly controlled by soil properties, especially OM. Adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.
PREDICTION OF BIOAVAILABILITY OF CHLORPYRIFOS RESIDUES IN SOIL TO EARTHWORMS
X.M Wu,Y.L Yu,M Li,Y.H Long
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: An incubation test was conducted to investigate the effect of aging on bioavailability of chlorpyrifos in soil and to assess the feasibility of chemical extraction techniques for predicting bioavailability of chlorpyrifos in soil. Chlorpyrifos was spiked into sterilized soil and aged in microcosms for up to 120 days. The earthworms were incubated in the spiked soils, at 0, 7, 14, 30, 60, and 120 days after spiking, for a period of 7 days. After exposure, chlorpyrifos concentrations in the earthworm tissues were determined. Change in chemical extractability of soil-chlorpyrifos was measured using a several solvent systems including methanol, methanol-water (9:1), acetone-water (5:3), and water. The results show that chemical extractability and earthworm bioavailability of chlorpyrifos in soil decreased with aging. The amount of aged and unaged chlorpyrifos recovered from soil varied with the individual chemical extractant and extraction method. Concentrations of chlorpyrifos in Eisenia foetida were significantly higher than in Allolobophora caliginosa, suggesting that the bioavailability of chlorpyrifos was a species-dependent process. The extractability of chlorpyrifos by chemical solvents was significantly correlated with bioavailability fraction of E. foetida and A. caliginosa, showing that these extraction techniques may be efficient for predicting bioavailability of chlorpyrifos in soil.
Isolating, Mapping and Spatio-Temporal Distribution Analysis of Five Ubiquitin-Specific Protease Genes in Porcine
X. Wu,X.B. Zhang,L.L. Zhu,Y.S. Tan,X.M. Tang
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.524.527
Abstract: The Ubiquitin-proteasome system is an essential mechanism for protein degradation in eukaryotes and ubiquitin-specific proteases are key effectors of the Ubiquitin-proteasome system. About 5 porcine USP genes (14, 16, 38, 44 and 54) were isolated and shared high sequence similarity with their human homologues genes. Then, the tissue expression pattern of 5 porcine USP genes were analysed by RT-PCR in 2 breeds (a domestic breed and a foreign breed) and the results showed that USP 14, 16, 38 and 54 gene expression were higher in muscle tissue. In addition, researchers mapped the 5 porcine genes and all chromosomes assignments were consistent with known chromosomal homologies between human and pig. All results provided a basis for further function study of these 5 USP genes.
PREDICTION OF BIOAVAILABILITY OF CHLORPYRIFOS RESIDUES IN SOIL TO EARTHWORMS
Wu,X.M; Yu,Y.L; Li,M; Long,Y.H; Fang,H; Li,S.N;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000100004
Abstract: an incubation test was conducted to investigate the effect of aging on bioavailability of chlorpyrifos in soil and to assess the feasibility of chemical extraction techniques for predicting bioavailability of chlorpyrifos in soil. chlorpyrifos was spiked into sterilized soil and aged in microcosms for up to 120 days. the earthworms were incubated in the spiked soils, at 0, 7, 14, 30, 60, and 120 days after spiking, for a period of 7 days. after exposure, chlorpyrifos concentrations in the earthworm tissues were determined. change in chemical extractability of soil-chlorpyrifos was measured using a several solvent systems including methanol, methanol-water (9:1), acetone-water (5:3), and water. the results show that chemical extractability and earthworm bioavailability of chlorpyrifos in soil decreased with aging. the amount of aged and unaged chlorpyrifos recovered from soil varied with the individual chemical extractant and extraction method. concentrations of chlorpyrifos in eisenia foetida were significantly higher than in allolobophora caliginosa, suggesting that the bioavailability of chlorpyrifos was a species-dependent process. the extractability of chlorpyrifos by chemical solvents was significantly correlated with bioavailability fraction of e. foetida and a. caliginosa, showing that these extraction techniques may be efficient for predicting bioavailability of chlorpyrifos in soil.
Effects of adsorption on degradation and bioavailability of metolachlor in soil
Wu,X.M; Li,M; Long,Y.H; Liu,R.X; Yu,Y.L; Fang,H; Li,S.N;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000300007
Abstract: the ability of soil to adsorb metolachlor strongly influences its environmental fate, but little information is available on the correlation of its soil adsorption with degradation and bioavailability. the present study was conducted to characterize adsorption, degradation and bioavailability of metolachlor in five soils with different properties, and to investigate the effect of soil adsorption on degradation and bioavailability. metolachlor was weakly adsorbed to the tested soils with adsorption coefficients ranging from 0.36 to1.18 μg1-nmlng-1, suggesting its potential to move downward with percolating water. adsorption followed a freundlich isotherm and was positively correlated with soil organic matter (om) content (p < 0.01). degradation of metolachlor in soils obeyed the first-order kinetics, yielding the half-life varying from 37.9 to 49.5 days, which was significantly influenced by soil om content (p < 0.01). the prolonged half-life by sterilization indicated that biodegradation was the dominant pathway for metolachlor degradation in soils. uptake and bioaccumulation of metolachlor in soils by eisenia foetida was also mainly controlled by soil properties, especially om. adsorption coefficients were negatively related to half-lives (p < 0.01) and bioaccumulation factors (p < 0.05), indicating that adsorption coefficients might be useful for predicting degradation and bioavailability of metolachlor in soils.
CALCULATION OF TRANSFORMATION VOLUME FRACTION TO HQ590 HOT ROLLED STRIP STEEL DURING CONTINUOUS COOLING
XGZhou,XMZhao,YBXu,DWu,
X.G.Zhou
,X.M.Zhao,Y.B.Xu,D.Wu

金属学报(英文版) , 2004,
Abstract: On the basis of phase transformation kinetics, the transformation of γ→α,P,B have been investigated through considering the effect of deformation. The calculation methods of volume fraction have also been given. Comparing with common method, the simulated results are in more agreement with experiment results.
HREM STUDY OF THE AUSTENITE/MARTENSITE INTERFACES IN AN Fe-9Ni ALLOY
GL Li,XM Meng,F T Zhang,YK Wu,
G.L. Li
,X.M. Meng,F. T. Zhang and Y.K. Wu

金属学报(英文版) , 1997,
Abstract: 1.Intr0ductionTheearlyinvestigati0nsll'2]dem0nstratedthatfccphaseandbccphasedonotmatchwell.Fromthe1970's,thefcc/bccinterfacestructurewasreconsideredandthestructuralledgemodelwassllggested3-5].Severalstudieshadbeendonewithc0nventi0nalTEMl6-8].Theyallf0undthatmisfitdislocati0nsexistinfcc/bccinterfacesandtheinterfacesaresemicoherent.Inrecentyears,HREMhasbeenempl0yedt0imagetheatomicstructureoffCc/bccinterface.Mahonetal.l9]studiedthe{252},austeinte/martensiteinterface,i.e.thehabitplaneinFe-8C…
MODELING OF ISOTHERMAL PRECIPrrATION KINETICS IN HSLA STEELS AND ITS APPLICATION
XMZhao,DWu,LZZhang,ZYLiu,
X.M.Zhao
,D.Wu,L.Z.Zhang,Z.Y.Liu

金属学报(英文版) , 2004,
Abstract: Microalloying elements in high-strength low-alloy steels, such as Nb, Ti and V, precipitate during hot-rolling processes. On the basis of classical theory of nucleation and growth, quantitative modeling of isothermal precipitation was developed, which was tested by the stress relaxation method, the calculated precipitation-time-temperature curve is in good agreements with the measured results, then the model was applied to predict the precipitation behavior during continuous cooling.
Assessment of Long Term UV Radiation Measured by the Brewer Spectrophotometer in Hong Kong during 1995-2005  [PDF]
T.J. Wang, K.S. Lam, Q. Liu, X.M. Wang
Atmospheric and Climate Sciences (ACS) , 2011, DOI: 10.4236/acs.2011.11002
Abstract: Time series of daily UV radiation measured by the ground-based Brewer spectrophotometer #115 in Hong Kong during 1995-2005 were studied through statistics analysis, with focus on the variability and long term changes in relation to total ozone, clouds and AOD (Aerosol Optical Depth). The 11-year mean UV daily dose is 2644±262 J/m2, with maxima(3311 J/m2) in 2000 and minima (2415 J/m2) in 2002. The data were compared with that from TOMS (Total Ozone Mapping Spectrometer) Version 8 and show general agreement between the two. However, the Brewer UV measurement is about 10% lower compared to TOMS data. Apart from the common-known strong seasonal cycle, 26 month periodical was resolved by use of wavelet analysis, which was believed to be associated with quasi-biennial oscillation (QBO) of general circulation. In cloudy days, the annual mean UV daily dose decrease 3.5% to 44.5% compared to clear days. It was also found that surface UV irradiance has close relation to air pollution. Under clear sky condition, 1% AOD increase will lead to 0.2% UV decrease. While global UV radiation increase due to the worldwide observed ozone depletion, investigations indicate that this trend is not significant in Hong Kong during the last 11 years. The possible causes can be attributed to the compensative effect from two aspects. One is the increase of UV resulting from the reduction of clouds with rate of 0.56/10 yr. The other is the decrease of UV due to the enhancement of total ozone and AOD with a rate of 4.23 DU/10 yr and 0.33/10 yr, respectively.
Expression Differentiation of BPI Gene in Post-Weaning Piglets of Yorkshire, Sutai and Meishan Breeds
J. Zhu,C. Zi,X.M. Su,L. Liu,Z.D. Du,L. Ye,K.Z. Xie,X.G. Huang,S.L. Wu,W.B. Bao
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.3155.3160
Abstract: The Bactericidal/Permeability-Increasing protein (BPI) plays a very important role in the animal body s natural defense. It has a series of biological functions such as killing Gram-negative bacteria, the neutralization of endotoxin or lipopolysaccharides, etc. To investigate the effect and mechanism of porcine BPI gene on enterotoxigenic Escherichia coli F18, particularly whether the expression of BPI gene is related to the different breeds. In this study, real-time PCR was used to analyze the expression of BPI gene expression in post-weaning piglets of Yorkshire, Sutai (Resource Population of resistance to E. coli F18) and Meishan. The results showed that there was almost no expression or very low expression of BPI gene in heart, liver, spleen, lung, kidney, stomach, muscle, thymus and lymph nodes but there was a high expression in the duodenum and jejunum and the expression levels were significantly different from those of the other 9 organs. It also showed that the jejunum and duodenum expression of BPI gene in Sutai was significant higher than Yorkshire and Meishan (p<0.05). The researchers can speculate that the expression of BPI gene was significant difference in different breeds. The researchers can further indicates that the expression of the BPI gene in Sutai piglets could be beneficial to the infection of E. coli. BPI gene might have a direct role against diarrhea and edema disease caused by ECF18 in weaned piglets, the resistance was related to the upregulation of BPI gene expression in the intestine. BPI gene can be identified as a genetic marker for future breeding against E. coli and Salmonella related diseases.
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