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1

Effects of Pb, Cd, Zn, and Cu on soil enzyme activity and soil properties related to agricultural land-use practices in karst area contaminated by Pb-Zn tailings

100%
Li Q., Hu Q., Zhang C., Jin Z.
Polish Journal of Environmental Studies
|
2018
|
tom 27
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nr 6
In order to study the impact of Pb, Cd, Zn, and Cu released by Pb-Zn tailings on soil enzymes and soil properties involving soil carbon and nitrogen cycle processes, 32 soil samples were collected from 2 different types of agricultural fields (one for growing corn and one for growing rice) contaminated by Pb-Zn tailings close to Sidi village in southwestern China. The results revealed that the paddy fields were seriously contaminated by Pb-Zn tailings compared with cornfields. Under the Pb-Zn tailings contamination, the population of fungi and actinomycetes as well as the activities of the soil enzymes (urease, invertase, and cellulase) in cornfields were significantly higher than those in the paddy fields. In addition, the results from path analysis showed that urease, invertase, and acid phosphatase were negatively correlated with DTPA-extractable Cd, Pb, and Zn (the direct path coefficients were -0.336, -0.314, and -0.591, respectively). Soil microorganisms and enzyme activities involving soil organic carbon and nitrogen decomposition and stabilization were decreased due to the toxic Pb-Zn tailings. Therefore, soil organic carbon and total nitrogen accumulate and an “elusive” carbon and nitrogen pool forms in the paddy fields compared with cornfields in the Pb-Zn tailings-contaminated karst area.
2

Motion characteristics after ricochet: an experimental investigation

88%
Chen G., Hu J., Liu A., Feng J., Hu Q.
Polish Maritime Research
|
2020
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tom 27
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nr 2
3

Content and spatial distribution of V and Ni in coastal sediments and waters of China’s Shuangtaizi Estuary

76%
Zhang J., Lin S., Hu Q., Tao P., Shao M., Lu J.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 3
In order to assess the spatial distribution and the potential pollution risk of nickel (Ni) and vanadium (V) in Shuangtaizi Estuary in China, the water and the surface sediments were collected to determine V and Ni content in specified sites. The data indicated that the estuary was contaminated by Ni, while V content was low. Total concentrations of V in river water ranged from 0.212 to 0.374 μg/L, and in surface and bottom seawater from 0.214 to 0.559 μg/L and 0.231 to 0.684 μg/L, respectively. V content in river sediments ranged from 0.093 to 0.119 μg/g and in ocean sediments were 0.032 to 0.123 μg/g. Total Ni concentrations in river waters ranged from 23.667 to 118.667 μg/L, and in surface and bottom seawaters were 32.000 to 90.323 μg/L and 42.000 to 100.333 μg/L, respectively. Ni content in sediments of river ranged from 15.303 to 21.732 μg/g and in sediments of ocean were 11.197 to 21.107 μg/g. Ni content was higher than that of V. An ecological risk assessment study shows that Ni has potential ecological risk in water and no risk in sediment. V has no potential ecological risk in Shuangtaizi Estuary. V and Ni concentrations increased from the inner estuary to the outer estuary. The anthropogenic emissions from land are the main sources of Ni and V in the study area.
4

Delta13C characteristics of soil organic carbon in hilly karst area

76%
Li Q., Li Z., Liang J., He Y., Cao J., Hu Q.
Polish Journal of Environmental Studies
|
2014
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tom 23
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nr 6
To understand the effects of geomorphology and environment on the 13C character of soil organic carbon (SOC) in a hilly karst area, 26 soil samples were collected in 2008 in Nanchuan, Chongqing, SW China. The results showed that the δ13C-SOC values were between -18.66‰~-27.41‰, with the mean value of -23.3‰. The data firmly indicated that the modern soil organic carbon was the mixture of C3 and C4 plants and mainly originated from C3 plants rather than C4 plants. According to the sequence of δ13C-SOC along the geomorphological change at this hilly karst area, it can be seen that the δ13C-SOC values was the crest > brae > foot. Based on the results of correlation analysis, the positive correlation between the δ13C-SOC values and their altitude is 0.432 (p=0.028), which reflects the land/soil degradation effects caused by the hilly geomorphology, especially in the water and soil erosion process.
5
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Antioxidant activity and mechanism in flower of Hylocereus undatus (Haw.) Britt. et Rose

76%
Li X., Gao Y., Han W., Lin J., Hu Q., Chen D.
Acta Biologica Cracoviensia. Series Botanica
|
2013
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tom 55
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nr 1
Hylocereus undatus flower is commonly used as food or for medicinal purposes in south China. To study its antioxidant activity and mechanism we used antioxidant and chemical assays to compare two commercial samples from different locations (Shenjing, Qixing). The difference in antioxidant levels corresponded with differences in chemical content (including total phenolics, total flavonoids, kaempferol and quercetin) between Shenjing and Qixing. The antioxidant ability of H. undatus flower seems attributable to total phenolics (mainly total flavonoids). Kaempferol is one of the main bioactive components. H. undatus flower exerts its antioxidant effects through metal chelation and radical scavenging via hydrogen atom (H•) and electron (e) donation.
6

Generation of an efficient artificial promoter of bovine skeletal muscle alpha-actin gene (ACTA1) through addition of CIS-acting element

64%
Hu Q., Tong H., Zhao D., Cao Y., Zhang W., Chang S., Yang Y., Yan Y.
Cellular and Molecular Biology Letters
|
2015
|
tom 20
|
nr 1
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