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11 results on '"Bai, Xuexin"'

7. A Self-Driven Microfluidic Chip for Ricin and Abrin Detection.

Author

Bai, Xuexin, Hu, Chenyi, Chen, Liang, Wang, Jing, Li, Yanwei, Wan, Wei, Jin, Zhiying, Li, Yue, Xin, Wenwen, Kang, Lin, Jin, Han, Yang, Hao, Wang, Jinglin, and Gao, Shan

Subjects
*RICIN, *MICROELECTROMECHANICAL systems, *TOXINS, *PHYTOTOXINS, *BIOLOGICAL warfare, *BIOSECURITY
Abstract

Ricin and abrin are phytotoxins that can be easily used as biowarfare and bioterrorism agents. Therefore, developing a rapid detection method for both toxins is of great significance in the field of biosecurity. In this study, a novel nanoforest silicon microstructure was prepared by the micro-electro-mechanical systems (MEMS) technique; particularly, a novel microfluidic sensor chip with a capillary self-driven function and large surface area was designed. Through binding with the double antibodies sandwich immunoassay, the proposed sensor chip is confirmed to be a candidate for sensing the aforementioned toxins. Compared with conventional immunochromatographic test strips, the proposed sensor demonstrates significantly enhanced sensitivity (≤10 pg/mL for both toxins) and high specificity against the interference derived from juice or milk, while maintaining good linearity in the range of 10–6250 pg/mL. Owing to the silicon nanoforest microstructure and improved homogeneity of the color signal, short detection time (within 15 min) is evidenced for the sensor chip, which would be helpful for the rapid tracking of ricin and abrin for the field of biosecurity. [ABSTRACT FROM AUTHOR]

Published
2022
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8. Magnetic mineral diagenesis in the river-dominated inner shelf of the East China Sea, China

Author

Ge, Can, Zhang, Weiguo, Dong, Chenyin, Dong, Yan, Bai, Xuexin, Liu, Jinyan, Thi Thu Hien, Nguyen, Feng, Huan, and Yu, Lizhong

Subjects
sedimentation rate, organic matter reactivity, river-dominated margin, East China Sea, magnetic properties, diagenesis
Abstract

The inner shelf of the East China Sea is a river-dominated margin characterized by fine-grained mud deposits and a rapid sedimentation rate. Three short sediment cores (similar to 2.7m in length) were examined to characterize spatial variations in magnetic mineral diagenesis. The sediment cores were analyzed for sedimentation rates, magnetic properties, particle size distribution, organic carbon, and total sulfur content. The two more proximal cores with higher sedimentation rates (similar to 2.2cm/yr and similar to 0.96cm/yr) do not exhibit obvious effects of reductive dissolution of magnetite with increasing depth, which is consistent with their lower total sulfur content. The offshore core, A12-4, which has a lower sedimentation rate, contains clear evidence of magnetite dissolution and increasing total sulfur content with depth. The three cores have a similar sediment source and organic matter input; therefore, we suggest that a higher sedimentation rate will lead to less reductive diagenesis of magnetite, assuming that other factors are constant. The iron- to sulfate-reduction boundary, i.e., revealed by the onset of a rapid decline of magnetic susceptibility, is located 1.0m below seafloor in core A12-4. This is much deeper than is reported in many other coastal marine environments and can be explained by the higher sedimentation rate, the presence of refractory terrestrial organic matter, and an abundant input of detrital iron oxides. This study demonstrates that analyses of the magnetic mineral zonation provide a straightforward approach to assess diagenetic organic carbon decomposition pathways in marine environments.

Published
2015

9. Assessment of heavy metal pollution in Red River surface sediments, Vietnam.

Author

Nguyen, Thi Thu Hien, Zhang, Weiguo, Li, Zhen, Li, Jie, Ge, Can, Liu, Jinyan, Bai, Xuexin, Feng, Huan, and Yu, Lizhong

Subjects
HEAVY metal toxicology, RIVER sediments, PARTICLE size determination, ANTHROPOGENIC effects on nature
Abstract

Surface sediment samples were collected from upstream down to the subaqueous delta of the Red River in Vietnam to assess heavy metal pollution. Sediment Cr and V concentrations are strongly correlated with Al, Fe, Mn and total organic carbon concentrations, as well as particle size, suggesting that these two metals are derived primarily from natural sources and enriched in the fine fraction of sediments. In contrast, Cu, Cd, Pb, Ni and Zn concentrations show weaker correlations with particle size, with very high concentrations observed at several sites in the upper reach of the river, pointing to anthropogenic input as a possible source of these heavy metals. Enrichment factors (EF) of Cu, Cd, Pb, Ni and Zn suggest that heavy metal pollution is present in sediments with significantly high values in the upstream. The data analysis indicates that Cd, Cu and Pb are the dominant pollutants in the Red River, with their concentrations reaching moderate to serious pollution levels. [ABSTRACT FROM AUTHOR]

Published
2016
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