Let R be a prime ring with involution and char R≠2 . Let f(X1,…Xn)be the noncentral multilinear polynomial over the extended centroid of R and d and δ bethe derivation of R .The surn of the coefficients in f(X1,…, Xn) (denoted by fsc) isnonzero. If d(fsc) =δ(fsc) and d(f(X1,…, Xn)) f(X1,…, Xn ) - f(X,1…,Xn ).δ(f(X1,…,Xn)) is central valued on the traces of R. Then either d =δ= 0 or Rsatisfy S4. Also we give the results when dm (f(X1,…, Xn)) is central valued on thetraces of R. Finally we give some results in semiprime rings.

Journal of Chongqing Jianzhu University

An Analysis on the Principal-Agent Model between Client and Property Management Company

Author: Yan Zhe

This paper applies economy principle to analyzing the principal agent model between client and property management company, the model is applied to putting forward three kinds of solutions contributing to solving the problems in present expenses collection of property management company.

Journal of Elinical Research

Combined Detection of Myocardial Markers Applied for the Diagnosis of Ischemic-hypoxic Encephalopathy

Author: Liu Yuan-xin

Objective To explore the diagnostic significance of detecting six myocardial markers in ischemic- hypoxic encephalopathy (IHE).Serum samples were collected from 39 IHE newborns and 47 healthy newborns (control group). Serum activities of six myocardial markers in IHE and control groups were estimated by AU-400 system automatized biochemical analyzer, including aspartic acid aminotransferase(AST), lactic acid dehydrogenase(LDH), creatine kinase(CK),CK-MB, α-hydroxybutyric dehydrogenase(HBDH) and myokinase(MYO). The positive rate of diagnosis during single item and multiple items detection was analyzed.Except AST and CK-MB, serum activities of LDH, CK, HBDH and MYO in IHE group exhibited significant disparity as compared with those in control group (all P0.01).The positive diagnostic rate of single item detection in this group was 64.1%～79.5%, while that of four items combined detection reached 84.6%.[Conclusion]Combined detection of multiple myocardial markers (AST, LDH, CK, HBDH and MYO) can help prompt clinical diagnosis of IHE.

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