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The effects of different electrode materials on seed germination of Solanum nigrum L.and its Cd accumulation in soil

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Journal of Environmental Sciences 2022年第3期34卷 291-299页

作者： Lei Xu Huiping Dai Lidia Skuza Shuhe Wei Key Laboratory of Pollution Ecology and Environment Engineering Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China College of Biological Science&Engineering Shaanxi Province Key Laboratory of Bio-resourcesShaanxi University of TechnologyHanzhong 723001China Institute of Biology Centre for Molecular Biology and BiotechnologyUniversity of SzczecinSzczecin 71-415Poland University of Chinese Academy of Sciences Beijing 100039China

The effects of different electrode on Solanum nigrum L.seed germination were determined.The result showed that germination percentage(GP)of seeds in treatment T2(titanium elec-trode)was 26.6%higher than in control(CK,without electric field).High potassium and calcium concentrations were beneficial for seed enzymatic activity in treatment T2,which could partly explain the increase in GP.Cd accumulation(μg/pot)in S.nigrum treated with any electric field was significantly higher(pelectric field.Specif-ically,Cd accumulation under the treatment T3(stainless steel electrode)was the highest both in roots and shoots;this accumulation in shoots and roots were 74.7%and 67.4%higher for stainless steel than in CK.This increase must have been associated with a higher Cd concentration in plants and did not exert a significant effect on the biomass.In par-ticular,Cd concentrations in roots and shoots under stainless steel treatment were both significantly higher than in CK(p<0.05),which had to be related to the higher available Cd concentration in the soil in the middle region.Furthermore,it could be attributed to al-tered soil pH and other soil properties.Moreover,none of the biomasses were significantly affected(p<0.05)by different electrode materials compared to CK.

关键词： Cd contaminated soil Solanum nigrum L. DC electric field Electrode materials Seed germination

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SOLIDIFICATION OF NICKEL-BASED SINGLE CRYSTAL SUPERALLOY BY electric field

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Acta Metallurgica Sinica(English Letters) 2005年第6期18卷 679-685页

作者： Y.S. Yang X.H. Feng G.F. Cheng Y.J. Li Z.Q. Hu Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016China

The crystal growth of a nickel-based single crystal superalloy DD3 was researched via controlled directional solidification under the action of a DC electric field. The cellular or dendrite spacing of the single crystal superalloy is refined and microsegregation of alloying elements Al, Ti, Mo and W, is reduced by the electric field. The electric field decreases the interface stability and reduces the critical growth rate of the ceUular-dendritic translation because of Thomson effect and Joule heating. The precipitation of the γ＇ phase is more uniform and the size of the γ＇ phase is smaller with the electric field than that without the electric field.

关键词： single crystal superalloy DC electric field crystal growth segregation,γ＇ phase

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