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yayafan1680新虫 (正式写手)
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[求助]
请改写下列四个句子，意思保持不变，谢谢！
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1.For example, cadmium (Cd) is a non-essential heavy metal that is toxic to living cells at a very low concentration. 2. Phytoremediation, the application of green plants to remove pollutants from soils, has received increased attention in recent years, and may be better than conventional technologies for remediating contaminated soil. This plant-based technique has shown significant economic, aesthetic, and technical advantages compared with traditional techniques, which include immobilization, mechanical separation, electro-kinetic remediation, and chemical washing. 3.The roots were washed with tap water to remove soil particles, and immersed in 20 mM Na2-EDTA for 1 hour to remove exchangeable Cd. The shoots and roots were further washed three times with deionized water, then placed in an oven at 105℃ for 20 minutes, and then heated further at 70℃ until a constant weight was reached. 4.The bioconcentration factor (BCF) is defined as the ratio of the metal concentration in plant shoots to the concentration in the soil. The translocation factor (TF) is the ratio of metal concentration in plant shoots to the concentration in plant roots. BCF and TF are important indexes that indicate the plant’s ability to accumulate a particular metal from the soil . |
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3楼2016-07-22 23:33:42
jnxybsf
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yayafan1680: 金币+20, ★有帮助 2016-07-22 23:08:04
爱与雨下: 金币+1 2016-07-23 20:52:35
yayafan1680: 金币+20, ★有帮助 2016-07-22 23:08:04
爱与雨下: 金币+1 2016-07-23 20:52:35
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For example, cadmium is heavy metal, but the very low concentration is rarely toxtic to living cells. As the application of green plants to remove pollutants from soils, Phytoremediation has received increasing attention by great properties including immobilization, mechanical separation, electro-kinetic remediation and chemical washing in recent years. It may be better than conventional technologies in terms of remediating contaminated soil. Meanwhile, it presents significant economic, aesthetic and technical advantages compared to conventional methods. The roots were imersed in 20 mM Na2-EDTA for 1 hour to remove Cd through ion exchange process after washing off soil practicles by tap water. Furthermore, the shoots and roots were heated at 105 ℃ in an oven after washing by deionized water. Last, it needed to reach constant weight at 70℃. |
2楼2016-07-22 19:42:18
818james
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yayafan1680: 金币+20, ★★★★★最佳答案 2016-07-24 10:16:38
yayafan1680: 金币+20, ★★★★★最佳答案 2016-07-24 10:16:38
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1. For example, cadmium (Cd) is a non-essential heavy metal that is toxic to living cells at a very low concentration Cadmium (Cd) is an example of heavy metal non-essential but toxic to living cells at a very low concentration. 2. Phytoremediation, the application of green plants to remove pollutants from soils, has received increased attention in recent years, and may be better than conventional technologies for remediating contaminated soil. This plant-based technique has shown significant economic, aesthetic, and technical advantages compared with traditional techniques, which include immobilization, mechanical separation, electro-kinetic remediation, and chemical washing. Recent years have seen Phytoremediation, the application of green plants to remove pollutants from soils receive increasing attention. It may be superior to conventional technologies for remediating contaminated soil. Significant economic, aesthetic, and technical advantages make this plant-based technique outshine traditional techniques, which include immobilization, mechanical separation, electro-kinetic remediation, and chemical washing. 3.The roots were washed with tap water to remove soil particles, and immersed in 20 mM Na2-EDTA for 1 hour to remove exchangeable Cd. The shoots and roots were further washed three times with deionized water, then placed in an oven at 105℃ for 20 minutes, and then heated further at 70℃ until a constant weight was reached. Rinse the roots in tap water to remove soil particles and dip them in 20 mM Na2-EDTA for 1 hour to remove exchangeable Cd. Further wash the shoots and roots three times with deionized water, then heat them in an oven first at 105℃ for 20 minutes, and later at 70℃ until gain a constant weight. 4.The bioconcentration factor (BCF) is defined as the ratio of the metal concentration in plant shoots to the concentration in the soil. The translocation factor (TF) is the ratio of metal concentration in plant shoots to the concentration in plant roots. BCF and TF are important indexes that indicate the plant’s ability to accumulate a particular metal from the soil . The bioconcentration factor (BCF) is the ratio of the metal concentration in plant shoots to the concentration in the soil while the translocation factor (TF) is the ratio of metal concentration in plant shoots to the concentration in plant roots, so BCF and TF are important indexes indicating the plant’s ability to accumulate a particular metal from the soil . |
4楼2016-07-24 09:10:25