Fungi Z4 and Z8, isolated from the heavy metal polluted soil, have strong resistance to Cd and Pb. The strains were identified on the base of their morphology and internal transcribed spacers(ITS) region. Pot experime...Fungi Z4 and Z8, isolated from the heavy metal polluted soil, have strong resistance to Cd and Pb. The strains were identified on the base of their morphology and internal transcribed spacers(ITS) region. Pot experiments were conducted to study the effect of two strains(Z4 and Z8) on the growth and accumulation of Cd and Pb of Guizhou oilseed rape. The results show that strains Z4 and Z8 belong to Mucor circinelloides and Mucor racemosus, respectively. The heights of Guizhou oilseed rape inoculated with strain Z8 increase by 47.90% than the control. The highest fresh mass is found in the plant with Z4/Z8, which is enhanced by160.81%. Pot experiments show that Z4/Z8 inoculums can accelerate accumulation of heavy metals in the plant. The contents of Cd and Pb are increased by 117.60% and 63.48%, respectively. Meanwhile, the heavy metal concentrations in potting soil with the two strains are found to be lower than those of the control, and the concentrations of Cd and Pb are decreased by 60.57% and 27.12%,respectively.展开更多
Based on the analysis of the enrichment char- acteristics of Hg and MeHg in bird feathers from Caohai National Nature Reserve in Guizhou, the risks of Hg pol- lution to the birds from Caohai wetland have been evalu- a...Based on the analysis of the enrichment char- acteristics of Hg and MeHg in bird feathers from Caohai National Nature Reserve in Guizhou, the risks of Hg pol- lution to the birds from Caohai wetland have been evalu- ated. The total Hg content of bird feathers ranges from 40 to 5058 ng/g.vyjth an average of 924 ng/g. The content of MeHg is significantly correlated with total Hg （r = 0.68,p 〈 0.01）, and the content are among 0.75 and 113 ng/g. The total Hg content in the birds feathers is significantly dependent on their feeding habits, which is mainly in accordance with the following rule： carnivorous birds 〉 omnivorous birds that are mainly carnivo- rous 〉 omnivorous birds that are mainly herbivorous. There are also differences in the Hg enrichment ability in the different parts of bird feathers, and the total Hg and MeHg content in the wing feathers are significantly higher than that in the other parts of feathers. The bioaccumula- tion coefficients of aqueous Hg and MeHg by bird feathers are 0.9 × 10︿4-112.13× 10︿4 （mean value is 20.47 ×10︿4）and 0.47 × 10︿4-70.4 × 10︿4 （mean value is 9.52 × 10︿4）, respectively. Although the whole Hg level in Caohai bird feathers is not too high, the Hg content in some carnivorous birds exceeds over or approaches the abnormal threshold when birds are breeding （5μg/g）, which indicates that the birds in Caohai wetland are faced with some risks of ecological Hg pollution.展开更多
The transient behavior of a semiconductor device is described by a system of three quasilinear partial differential equations: one elliptic in form for the electric potential and two parabolic in form for the conserva...The transient behavior of a semiconductor device is described by a system of three quasilinear partial differential equations: one elliptic in form for the electric potential and two parabolic in form for the conservation of electron and hole concentrations,展开更多
基金Projects(31100082,60871007,61171061)supported by the National Natural Science Foundation of ChinaProject(2012SK4028)supported by the Science and Technology Agency of Hunan Province,China+1 种基金Project(2013M530358)supported by the Post-doctoral Program of ChinaProjects(12JJ4032,12JJ4082)supported by the Natural Science Foundation of Hunan Province,China
文摘Fungi Z4 and Z8, isolated from the heavy metal polluted soil, have strong resistance to Cd and Pb. The strains were identified on the base of their morphology and internal transcribed spacers(ITS) region. Pot experiments were conducted to study the effect of two strains(Z4 and Z8) on the growth and accumulation of Cd and Pb of Guizhou oilseed rape. The results show that strains Z4 and Z8 belong to Mucor circinelloides and Mucor racemosus, respectively. The heights of Guizhou oilseed rape inoculated with strain Z8 increase by 47.90% than the control. The highest fresh mass is found in the plant with Z4/Z8, which is enhanced by160.81%. Pot experiments show that Z4/Z8 inoculums can accelerate accumulation of heavy metals in the plant. The contents of Cd and Pb are increased by 117.60% and 63.48%, respectively. Meanwhile, the heavy metal concentrations in potting soil with the two strains are found to be lower than those of the control, and the concentrations of Cd and Pb are decreased by 60.57% and 27.12%,respectively.
基金supported by the National Natural Science Foundation of China (No. 41363007)
文摘Based on the analysis of the enrichment char- acteristics of Hg and MeHg in bird feathers from Caohai National Nature Reserve in Guizhou, the risks of Hg pol- lution to the birds from Caohai wetland have been evalu- ated. The total Hg content of bird feathers ranges from 40 to 5058 ng/g.vyjth an average of 924 ng/g. The content of MeHg is significantly correlated with total Hg （r = 0.68,p 〈 0.01）, and the content are among 0.75 and 113 ng/g. The total Hg content in the birds feathers is significantly dependent on their feeding habits, which is mainly in accordance with the following rule： carnivorous birds 〉 omnivorous birds that are mainly carnivo- rous 〉 omnivorous birds that are mainly herbivorous. There are also differences in the Hg enrichment ability in the different parts of bird feathers, and the total Hg and MeHg content in the wing feathers are significantly higher than that in the other parts of feathers. The bioaccumula- tion coefficients of aqueous Hg and MeHg by bird feathers are 0.9 × 10︿4-112.13× 10︿4 （mean value is 20.47 ×10︿4）and 0.47 × 10︿4-70.4 × 10︿4 （mean value is 9.52 × 10︿4）, respectively. Although the whole Hg level in Caohai bird feathers is not too high, the Hg content in some carnivorous birds exceeds over or approaches the abnormal threshold when birds are breeding （5μg/g）, which indicates that the birds in Caohai wetland are faced with some risks of ecological Hg pollution.
基金Project supported by the National Natural Science Foundation of China
文摘The transient behavior of a semiconductor device is described by a system of three quasilinear partial differential equations: one elliptic in form for the electric potential and two parabolic in form for the conservation of electron and hole concentrations,
