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How Chlorella sorokiniana and its high tolerance to Pb might be a potential Pb biosorbent

100%

Liang S. , Kang Y. , Zeng L. , Qin Y. , Wang L. , Zhang Q. , Luo J.

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tom 26

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nr 3

EN

The link between the acute toxicity of heavy metals on algae and the bioadsorption capacity of heavy metals by algae has seldom been reported. In the present study, an acute toxicity experiment was carried out to assess the toxic effects of Pb, Cu, and Cd for Chlorella sorokiniana, and the 96 h IC₅₀ values were 0.249 mg/L, 0.485 mg/L, 46.108 mg/L, and 21.00 mg/L for Cu, Cd, Pb (total), and Pb (free ion), respectively, which implied that Chlorella sorokiniana showed high tolerance to Pb compared to Cu and Cd. Pb distribution analysis indicated that 73.40% to 98.15% of free Pb ions were accumulated on the algae cell wall to avoid further intracellular accumulation, resulting in irreversible metabolic disorders. Then the adsorption capacity of Chlorella was explored. It could be found that the Langmuir model (the R² were 0.988 and 0.962 for living and lifelss cells, respectively) was fit to explain the adsorption equilibrium data and the qₑ calculated by this model were 1.54 and 2.97 mg /10¹⁰ cells for living and lifeless cells, respectively, which was consistent with the experimental result. In the competitive adsorption, Chlorella exhibited a greater affinity for Pb with the higher removal rate compared to Cu and Ni. Therefore, the renewable Chlorella sorokiniana and its dramatic resistance to Pb may serve as a potential biosorbent for Pb in the future.

2

Accumulation and health risk assessment of PAHs in radish

100%

Guo J. , Chai C. , Ge W. , Zeng L. , Wu J. , Xiang D. , Zhang X.

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nr 6

EN

Three kinds of soil with different levels of polycyclic aromatic hydrocarbon (PAH) contamination were collected, and diesel was added to soil to prepare two kinds of diesel-contaminated soil. The radish was planted in five kinds of soil through a pot experiment, and the concentration and composition of PAHs in radish were analyzed using high-performance liquid chromatography with an ultraviolet and fluorescent detector. The PAH contribution in aboveground parts of radish from atmospherically deposited particulates was studied, and the health risk of ingesting contaminated radish was assessed. Results showed that PAH concentrations (196.2-982.6 ng/g) in the parts of radish found underground were significantly higher than in aboveground parts (129.7-556.7 ng/g, p<0.05). Predominant PAH compounds in radish were the 3- and 4-ring PAHs, accounting for 78.1-92.7%. In general, the values of root concentration factors (RCFs: 0.30-0.55) were significantly higher than shoot concentration factors (SCFs: 0.19-0.39, p<0.05). Atmospherically deposited particles contributed less than 1% of the PAHs in aboveground parts of radish, which indicated two things: the atmospheric particles had a slight effect on the PAH content in aboveground parts of radish , and the soil contributed more to PAH accumulation in aboveground parts of radish than the particles. The total toxicity equivalence quotient in radish grown in diesel-contaminated soil samples was higher than in other types of soil. Ingestion of radish planted in five kinds of soil had no carcinogenic risk to children, adolescents, and seniors; whereas ingestion of radish from heavily contaminated and diesel-contaminated soil samples had carcinogenic risks to adults. This study highlights the accumulation and potential health risks associated with cultivation and consumption of radish in soil with different contamination levels and sources of PAHs.

3

Immunomodulatory effects of HMG-CoA reductase inhibitors

100%

Danesh F. R. , Anel R. L. , Zeng L. , Lomasney J. , Sahai A. , Kanwar Y. S.

Archivum Immunologiae et Therapiae Experimentalis

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2003

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tom 51

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nr 3

4

Adsorption performance on sediment nutrients by different proportions of zeolite and shale ceramsite (ZSC)

84%

Sun J. , Yang M. , Zeng L. , Wang M. , He S. , Cai S. , Li L. , Liu X. , Zhang H.

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2020

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tom 29

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nr 3

5

cDNA cloning, gene organization and expression analysis of human peptidylarginine deiminase type VI

67%

Zhang J. , Dai J. , Zhao E. , Lin Y. , Zeng L. , Chen J. , Zheng H. , Wang Y. , Li X. , Ying K. , Xie Y. , Mao Y.

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nr 4

EN

Peptidylarginine deiminase (PAD) catalyzes the post-translational modification of protein through the conversion of arginine to citrulline in the presence of calcium ions. Human, similar to rodents, has four isoforms of PAD (type I, II, III and IV/V), each of which is distinct in substrate specificity and tissue specific expression. In our large-scale sequencing project, we identified a new human PAD cDNA from a human fetal brain cDNA library. The putative protein encoded by this cDNA is designated hPADVI. Expression analysis of hPADVI showed that it is mainly expressed in adult human ovary and peripheral blood leukocytes. We conclude that hPADVI may be orthologous to mouse ePAD, basing on sequence comparison, chromosome localization and exon-intron structure analysis. PAD-mediated deimination of epithelial cell keratin resulting in cytoskeletal remodeling suggests a possible role for hPADVI in cytoskeletal reorganization in the egg and in early embryo development. This study describes a new important member of the human PAD family.