Myelodysplastic syndrome (MDS) is a group of origin of hematopoietic stem/progenitor cells of myeloid clonal disorders.Studies have shown that MDS patients are with varying degrees of abnormal iron metabolism in the course of diagnosis and supportive care.Iron overload can damage the body's iron balance.Excess free iron can sink in plasma and tissue,especially in the body's major organs such as heart,liver and endocrine gland,resulting in structural damage and organ dysfunction,accelerating transformation to acute myeloid leukemia,and increasing the death rate.Iron chelation can improve the prognosis of patients,prolong overall survival and leukemia-free survival.The mechanism of iron overload in MDS research will be described in this paper.

Cancer stem cells are defined as the unique subpopulation in the tumors that possess the abili-ty to initiate tumor growth and sustain self-renewal as well as metastatic potential.Accumulating evidences in recent years strongly indicate the existence of cancer stem cells in solid tumors of a wide variety of organs.In recent years,many cancer stem cells have been found,including leukemia,breast cancer,brain ttunor,liv-er cancer,colon carcinoma,etc.In this review,we will discuss the conception and origin of the gastric cancer stem cells,and their role in the development of multi-drug resistance.

Objective To analysis the effect of vitamin, folic acid combined with Ginkgo biloba extract on cognitive function in elderly patients with stroke.Methods 56 patients who were diagnosed with acute cerebral infarction were collected.All patients were randomly divided into experimental group and control group, 28 cases in each group.Control group was given conventional treatment for improving circulation, nutrition brain cells, anti platelet aggregation, experimental group was given vitamin B6 tablets(20 mg,one time per day), folic acid tablets(20 mg, one time per day) and Ginkgo Biloba Extract Tablets(80mg, two times per day) on the basis of conventional treatment.After treatment, the levels of plasma Hcy, serum BDNF, UCP2 level and cognitive function were detected in all patients.ResuIts After treatment, compared with control group, the plasma Hcy level was significantly lower in experimental group(P<0.05).The serum BDNF level in experimental group was significantly higher (P<0.05) .The serum UCP2 level in experimental group was significantly higher (P<0.05) .The MMSE and MoCA scores of the patients in the experimental group were significantly higher (P<0.05).ConcIusions Vitamin, folic acid combined with Ginkgo biloba extract can reduce the level of plasma Hcy in elderly patients with stroke, improve serum BDNF, UCP2 levels, improve the cognitive function.

The baculoviral inhibitors of apoptosis play a significant role in infectivity and viral host-range, which make them potential candidates for the engineering and improvement of baculovirus insecticidal. The iap3 gene of Spodoptera exigua nucleopolyhedrovirus (SeMNPV), amplified by PCR, was 939 bp encoding IAP3. The PCR product was cloned into EcoR I/Bam H I of the plasmid pEGFP-C1. GFP was fused to the N-terminaus of IAP3 to study distribution in HEK293. It was observed that the plasmid expressing IAP3 significantly inhibited apoptosis induced by cisplatin in HEK293 cells. We conclude that the IAP3 of SeMNPV is functional in mammalian cells.

Purpose　The aim is to study the transduction of m urine stem cell factor(SCF) into umbilical blood cells by LipofectinRMmediated and expression in them.Methods　Murine SCF cDNA encoding extra cellu lar domain was isolated using PCR from plasmid pRC/CMV(containing SCF gene), and then recombined into the expression vector pcDNA3,and transferred into enrichme nt cultural umbilical blood cells. Semi-quantitative RT-PCR was used to examin e the expression on mRNA level.And the effects of supernatant of transfected umb ilical blood cells were investigated alone or in coordinate with GM-CSF by colo ny formation test of human bone marrow cells in semisolid culture.Results 　SCF mRNA was expressed in transfected umbilical blood cells.The su pernat ant of transfected umbilical blood cells could increase the number of CFU-GM, s ynergizing with GM-CSF.Conclusion　The supernatant of umbil ical b lood cells transfected with vector containing mSCF gene can stimulate the colony formation of human bone marrow cells in combination with GM-CSF.

Tethered cord syndrome is a severe and congenital disease. Resecting the diseased ilium terminal(FT), eystis, lipoma is the main treatment for the disease, relieving the injury to the eonus medullaris. Why the FT is diseased and thickened? Is it necessary to eut internal FT or external FT? What is the injury mechanism of the low-positional or normal positional oonus medullaris? To study the component and structure of the conus medullaris and FT may give definite answers.

Objective To study the risk factors of central lymph node (CLN) metastasis in papillary thyroid carcinoma (PTC),to provide the basis for clinical treatment.Methods A total of 407 patients with PTC in thyroid surgery,the Third Affiliated Hospital of Harbin Medical University from January 2010 to June 2012 who had undergone at least ipsilateral CLN were studied.These factors included normal situation,thyroidglobulin antibody or thyroid microsomal antibody,family history,pathological features (the size of primary,tumor multifocal,tumor location and capsular invasion),TNM staging and CLN metastasis.Univariate analysis and multivariate analysis were performed using x2 test and binary Logistic regression test,respectively.Results The CLN metastasis rate was 51.351％ (209/407) of the 407 patients with PTC.The CLN metastasis was significantly associated with age,tumor multifocal,the size of primary tumor,capsular invasion and TNM (x2 =21.080,14.974,47.671,12.858,8.765,all P ＜ 0.01).Sex,thyroid globulin antibody or thyroid microsomal antibody,family history and tumor location were not associated with CLN metastasis (x2 =1.457,1.106,0.000,0.260,all P ＞ 0.05).Multivariate analysis indicated that age (＜ 45 year),the size of primary tumor (≥ 1.0 cm),tumor-muhifocal,and TNM (T3 + T4) were the independent risk factors for CLN metastasis [odds ratio (OR) =0.937,2.347,0.380,0.389,all P ＜ 0.01].Conclusions Age (＜ 45 year),the size of primary tumor (≥ 1.0 cm),tumor-multifocal and TNM (T3 + T4) are risk factors for CLN metastasis in PTC.Dissection of CLN should be considered for PTC patients with these factors.

Objective To investitgate the level of polychlorinated biphenyls in retail livestock meat.Methods Totally 28 samples of three kinds of meat including of beef,pork and mutton were collected during Aug-Dec.,2008.Twelve dioxin-like polychlorinated biphenyls(DL-PCBs) and six marker PCBs were extracted by Soxhlet extractor,cleaned up by FMS and qualitative and quantitative analyzedsis by isotope dilution high-resolution gas chromatography/high resolution mass spectrometry(HRGC/ HRMS).Results Levels of total 18 compounds including of 12 DL-PCBs and indicator PCBs in beef,pork and mutton were 1 607.60 pg/g fat,435.82 pg/ g fat,and 505.17 pg/g fat respectively,DL-PCBs concentration were 456.19 pg/g fat,46.37 pg/g fat and 77.50 pg/g fat respectively.Maker-PCBs concentration were 1 151.41 pg/g fat,389.45pg/g fat and 427.67 pg/g fat respectively.The levels of PCB toxicity equivalent(TEQ)(the median value)were:0.84 pg/g fat in beef,0.15 pg/g fat in pork,0.28 pg/g fat in mutton respectively.The TEQ concentration of PCB(median value) was lower than the EU action level limit value.In all samples,PCB118 was the greatest contributor to the total contaminated concentration,and PCB126 was the dominant contributor to toxicity equivalent(TEQ).Six of 28 samples exceeded the limit value of the EU action level.Conclusion The results show that PCBs contamination exists in a city from the six samples exceeding the EU standard limit.It should take measures to explore the cause of contamination of PCBs compounds and control the pollution in order to guarantee food safety effectively.

In order to meet the requirements of logistic supply in peacetime and wartime, General Health Department developed Managerial and Maintenance System of Army Medical Equipments, which is the important subject of 10th 5-year Army Medical Research. This system is based upon Basic Medical Equipments Distribution Standard, Army Medical Equipments Management System, joint support system and three-level maintenance network. An efficient platform for whole-survival-circle medical equipments monitoring is developed using computer information technology. This system can greatly advance the informatized, normative management of medical equipments, and thus is of avail in military and economic aspects.

Objective To investigate the main causes and strategies for the difficulties in ureteroscopic lithotripsy.Methods From March 2004 to December 2006,19 cases of ureteral calculi,who experienced difficulties during holmium laser lithotripsy or pneumatic lithotripsy under a rigid ureteroscope,were analyzed retrospectively.Among the cases,3 had difficulties in ureteroscope placement due to the narrow ureteral ingress,6 owing to calculus obstruction complicated with ureteral inflammatory polypi,4 resulted from twisted ureter,and 6 because of stenosis of the ureter.Results In 15 of the patients,the operation was successfully performed by changing surgical approach,controlling the hydraulic irrigation,and incising the stenotic segments,etc.Two patients,who had stenotic ureter,received ESWL with double-J catheter dwelling.Lithotripsy failed in 2 cases,and PCNL was used to remove the calculi.The postoperative complications occurred in 4 cases,including 2 with mucosal laceration and 2 ureteral perforations.One of the 4 cases was transferred to an open surgery,and the other 3 were cured by conservative treatments.Conclusions Holmium Laser lithotripsy and pneumatic lithotripsy under a rigid ureteroscope are safe and effective in treating ureteral calculi.