Purpose To study the possibility of prevention of proliferative vitreoretinopathy(PVR) by transduction of exogenous gene in vivo. Methods PVR model of rabbits was induced by intravitreal injection of fibroblasts.? galactosidase (lacZ) gene as a reporter gene was transfered into the vitreous of PVR model eyes mediated by retroviral vector, and the expression of the gene in eye tissues was determined. Gene transfection was done on the 6th day after fibroblasts injection,and the dosage of intravitreal injection of reporter gene was 0.1ml PLXSN/lacZ serum free supernatant (1.1?10 6 cfu/ml). Results lacZ gene expression was seen in proliferative membranes after gene transfection, and the expression was located maily at the surface of PVR membrane. The reporter gene expression lasted at least more than 30 days. No expression was found in retinal tissues. Conclusions Retrovirus mediated gene can be directionally transducted in PVR membrane,and might possess the feasibility of gene therapy for PVR. [

AIM:The Effects of Spirulina Platensis Polysaccharide (SPP)on peripheral NK cell from healthy persons and acute leukemia patients were studied.METHODS:The activities of NK cell on target cell K 562 was measured with MTT method.RESULTS:The results showed that SPP could argument the NK cell activity from varies peroid cases with acute leukemia.SPP had no activity on NK cell from normal person.Cytotoxicity did not present when the peripheral blood mononuclear cell were co incubated with SPP.CONCLUSION:These results suggested that SPP could be exploited and utilized as an approach of biological responsive modifier therapy in the treatment of acute leukemia.

Objective To investigate the effect of Hydroxychloroquine plus Leflunomide on the lipid profile and disease activity index in patients with rheumatoid arthritis (RA).Methods A total of 140 elderly patients with RA who met the American College of Rheumatology (ACR) criteria were treated with Hydroxychloroquine (Group A,n =70) or leflunomide combined with hydroxychloroquine (Group B,n=70),and 100 healthy volunteers were selected as controls.The lipid profile was compared between the patient groups and control group.Lipid levels,Disease Activity Score 28 (DAS28),erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) were measured before treatment and 6 months after treatment between Group A and Group B.Results Compared with the control group,RA patients exhibited higher levels of total cholesterol (TC,P＜0.05),low-density lipoprotein cholesterol (LDL-C,P＜0.05) and triglycerides (TG,P＜0.01),and lower levels of high-density lipoprotein cholesterol (HDL-C,P＜0.05).After 6 months of treatment,the disease activity index (DAS28,P＜0.01),the duration of morning stiffness (P＜0.01),ESR,CRP,swollen joint count (SJC) and tender joint count (TJC) decreased in RA patients,compared with controls (P＜0.01 or 0.05).HDL-C levels increased and LDL-C levels decreased in Groups A and B after treatment,compared with pretreatment (P＜0.05 for all).After treatment,TC levels decreased in Group B,compared with Group A (P＜ 0.05),while TG levels had no significant difference between the two groups (P＞0.05).TC and LDL-C levels,ESR,CRP,DAS28,SJC and TJC were lower in Group B than in Group A (all P＜0.05).Conclusions Hydroxychloroquine in combination with Leflunomide therapy can not only control inflammation but also improve the lipid profile,and is more effective than single-drug therapy.The combination may reduce the risk of atherosclerosis and cardiovascular events in patients with RA.

Many kinds of volatile organic compounds(VOCs)exist in the indoor air,the chemical reaction will occur among the pollutants when O3 and NO2 exist simultaneously.This reaction can severely impact the indoor air quality and produce some adverse effects on human health.The main chemical reactions among the indoor air pollutants and the potential health effects associated with inhalation exposure to the products of the chemical reaction in the indoor air were discussed in the present paper.The study of the chemical reactions among indoor VOCs is very important for human health and is helpful for revising the Indoor Air Quality Standard and making the 'Ecologic Label' of building materials.

Objective To understand the control of medical waste disposal in Changsha. Methods The kinds, output, collection and disposal of medical wastes were investigated in three general hospitals, one tumor hospital and one paediatric hospital in Changsha. Results The main components of medical wastes were glass, plastic and cotton, which took 55%, 20% and 12% of the total output respectively. The daily outputs of medical wastes were 0.48?0.63 and 0.43 kg per bed in three general hospitals, 0.58 and 0.71 kg per bed in paediatric hospital and tumor hospital respectively. Based on these data, the daily output of medical wastes in Changsha was estimated about 9.390 t. The recovery rate of medical wastes mainly including glass and plastic was 49.32%. The disposal rate of medical wastes only was 1.34%. The rest of medical wastes of 49.34% were mixed into domestic wastes or landfilled. Conclusion The management of medical wastes wasn't perfect in Changsha, which presented potential environmental pollution.

The continuous artery-vein infusion method was used for the study of the origin, number, course, anastomosis, point of penetration and distribution of external arteries on 60 sides and internal arteries on 18 sides of the brain stem (mesencepha- lon and medulla oblongata) in Chinese under magnifiers (10-16?). The arteries of the brain stem can be divided into four groups: the anteromedial, anterolateral, lateral and posterior arteries. Each group originates from several different arteries. The spot where external arteries penetrate into the substance of brain stem is called the point of penetration, several points of penetration concentrating together make the dense penetrating area. The dense penetrating areas on mesencephalon are the interpeduncular fossa and sulcus lateralis and those on the medulla oblongata are the fissurae mediana anterior and sulcus posterior to olive. There are fine arterial networks in the pia mater of the brain stem. In the mesencephalon and the closed portion of the medulla oblongata, the internal arteries traverse centripetally while in the open portion of the medulla oblongata, they course towards the floor of the fourth ventricle. The calibre of arteries in each group decreases anteroposteriorly. A comparatively constant blood supply area is available to each group.

Objective To observe the anesthesia and analgesia effect of ultrasound guided inter-scalene brachial plexus block (ISPSP)on upper extremity surgery.Methods Fifty-four patients (male 34 cases,female 20 cases,aged 37-73 years,ASA grade Ⅰ or Ⅱ)scheduled for elective upper limb surgery under ISPBP combined with general anesthesia were randomly assigned into two groups:magnesium sulfate group (group M,n =27)and control group (group N,n =27).0.5% ropivacaine 8ml (40 mg)+10% magnesium sulfate 2 ml (0.5 g)were used in group M ,0.5% ropivacaine 8 ml+ normal saline 2ml (40 mg)were used in group N.After the effects of ISBPB were confirmed,pa-tients were inserted laryngeal mask under intravenous induction.Anesthesia was maintained by inha-ling sevoflurane(MAC 0.8)during the operation.The onset time of sensory and motor block,duration of sensory and motor block,duration of analgesia,pain visual analogue digital score (VAS)4,8,12, 24 hours after operationand complications were recorded.Results Duration of sensory block and du-ration of analgesia of group M was significantly longer than those of group N (P <0.05).The patient`s VAS score of 8,12,24 hours after surgery in group M was significantly lower than that on group N (P <0.05).Onset time of sensory and motory block of both groups was similar.Conclusion 0.5%ropivacaine combined with magnesium sulfate in ultrasound-guided ISPBP can extend the duration of sensory block,reduce postoperative pain,as well as prolong analgesia time.

Objective To investigate the expression of apoptosis-related genes Bcl-2 and Bax after cerebral ischemic reperfusion in hippocampal CA1 and CA3 areas and the effect of curcumin on the expression of Bcl-2 and Bax in gerbils.Methods Gerbils were randomly divided into sham group(SH),ischemia-reperfusion group(IR),curcumin group(CU) and solvent control group(SC).Forebrain ischemia was induced by occlusion of bilateral common carotid arteries.Observations were made in each group 1d,3d,5d and 7d after ischemia.Open field test was used to examine the behavioral change.The apoptotic neurons in hippocampal CA1 region was counted,and the expression of Bcl-2 and Bax in hippocampal CA1 and CA3 areas was detected by SABC immunocytochemical technique.Results The behavioral mark and the number of apoptotic neurons in hippocampal CA1 and CA3 areas were much smaller in CU group than in IR group(P

Recently, more and more public attention has been paid to nanomaterials in various fields. Especially, the preparation methods of core/shell nanoparticles have been drastically updated and developed. There exists great application prospect for the development of biosensing core/shell nanoparticles. This paper emphatically introduced the operation principle, preparation methods of biosensing core/shell nanopaticles and the latest application progress in electrochemical biosensor, optical biosensor and piezoelectric crystal biosensor.

Biosurfactant is a high surface active agent synthesized by microorganism Compared with chemical surfactant, biosurfactant has a low toxicity to ecological system of Earth So biosurfactant is gradually applied to many aspects of environmental pollution control A review is made from several aspects: screening of biosurfactant producing microorganism, optimization of culture brooth, isolation of biosurfactant et al In addition, on the foundation of the analysis, several suggestions about the development of biosurfactant are proposed in the end