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We study the properties of McCoy rings with a doubly mapping, give some examples of this class rings, investigate their extensions and the *-nil McCoy property of *-skew polynomial rings. We showed that (1) Let *-ring R satisfy nil(R[x]) = nil(R)[x]. Then R is *-nil McCoy if and only if R[x] is *-nil McCoy; (2) Let R[x; *] be *-skew polynomial ring. If R is *-revisible, then R[x; *] is *-nil McCoy.(研究了具有对合映射*-诣零McCoy环的性质，给出了一批*-诣零McCoy环例子，并讨论了其扩张和*-斜多项式环的*-诣零McCoy性，证明了（1）设*-环R满足nil（R［x］）=nil（R）［x］，则环R是*-诣零McCoy环当且仅当环R［x］是*-诣零McCoy环；（2）设R［x；*］是*-斜多项式环，如果R是*-可逆环，则R［x；*］是*-诣零McCoy环。)

Let R be a ring with an automorphism σ and a σ-derivation δ. We introduce the concept of (σ, δ )-SILS right weak McCoy rings, give their characterizations and investigate their structural properties by means of the itemized discussion method, enriching the research of general skew inverse Laurent series rings. [ABSTRACT FROM AUTHOR]

Objective: To explore the feasibility of induction of neutralization antibodies against hepatitis C virus (HCV) infection by HCV envelope 2 protein (E2) DNA vaccines immunization., Methods: Two kinds of expression plasmids of HCV envelope 2 protein, plasmid pCI-1b661 Delta encoding hydrophobic carboxyl terminal truncated E2 and pCI-1b661 Delta encoding E2 with deletion of hypervariable region 1 (HVR1) and carboxyl terminal, were constructed and respectively transfeted 293T cells, and truncated E2 protein in whole cell lysate and supernatant of 293T cells were analyzed by Western blot. After BALB/c mouse were intramuscularly immunized by the plasmids, sera antibodies against HVR1 were detected by ELISA and the neutralization activity of the antibodies were assayed with HCV pseudotype particle (HCVpp)., Results: Both plasmids could express secretary truncated E2 protein. All the mice immunized with plasmid pCI-1b661 produced HVR1 antibodies,while no HVR1 antibodies were detected in pCI-1b661 Delta immunized mice. The sera neutralization percentages against HCVpp in pCI1lb661 Delta and pCI-lb661 Delta immunized mice were (78.5 +/- 13.8)% and (38.7 +/- 6.5)%, respectively (P <0.01). Sera neutralization activity against HCVpp was positive correlated with the level of HVR1 antibodies in pCI-1b661 immunized mice (r = 0.967, P<0.01)., Conclusion: DNA vaccines expressing truncated E2 protein could induce neutralization antibodies against HCV, and neutralization antibodies mainly was consisted of the antibodies against HVR1.

This paper studied the resistant physiology of three mangrove species, Sonneratia caseolaris, Aegiceras corniculaturn and Bruguiera gymnorrhiza in a subsurface flow-constructed wetland sewage treatment system under freshwater condition. The results showed that in a year period, the superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) activities of three mangrove species increased gradually and maintained at a high level, the proline content reached the maximum from July to September, while the plasma membrane permeability did not show any obvious change. In comparing with those grown in the Futian Nature Reserve of Shenzhen, three mangrove species in the test sewage treatment system had lower SOD, POD and CAT activities and higher proline content, while no significant difference was observed in the malondialdehyde (MDA) content and plasma membrane permeability. It was suggested that three mangrove species could adapt to the subsurface flow-constructed wetland sewage treatment system under freshwater condition.