Objective In order to analyse the problem that eligible water from factory will deteriorate during the transportation in the water supply networks. The aim of the present paper is to provide theoretic basis to ameliorate the water quality and make drinking water more secure. Methods Regarding water supply networks as a grey system, applying grey relational analysis to establish the attribution recognition model. The classification of water quality was treated as a grey sort and the state of water quality was a grey system. Water quality classified rank was determined and the water quality was analyzed according to the grey relation analysis theory. Results Three monitoring spots in north networks which included fourteen water quality gene was calculated. The relation degree matrix was educed. The result showed that the water quality of the first and the third monitoring spots belonged to grade one, and the second spot belonged to grade two. Conclusion Applying attribute recognition model based on the grey relation to analyze the water quality in the water supply networks, the case study shows that the grey relational analysis method is more reasonable, simple, reliable and informative. The effect of subjective factors is eliminated. The accuracy of model is verified by the experimental data in the end. There is a good agreement between the calculated result and actual condition.

BACKGROUND:Although the preparation of bone tissue engineering scaffolds can achieve satisfactory results by solvent casting/particulate leaching, in situ molding method, electrospinning, phase seperation/freeze drying, gas foaming, there are stil some deficiencies in the accuracy, pore uniformity, spatial structure complexity, personalized stents. ＜br> OBJECTIVE:To prepareβ-tricalcium phosphate bone tissue engineering scaffolds using 3D printing. ＜br> METHODS:Drug-loadedβ-tricalcium phosphate scaffolds were prepared with 3D printing, and the structure was observed to measure its porosity and mechanical strength. The scaffold was immersed in simulated body fluid for 15 weeks to observe the quality change. The scaffold was co-cultured with rat bone marrow mesenchymal stem cells for 7 days to observe celladhesion and morphological changes. Rat bone marrow mesenchymal stem cells were cultured in extracts of drug-loadedβ-tricalcium phosphate scaffold and low-glucose Dulbecco's modified Eagle’s medium containing 15%fetal bovine serum for 24, 48, and 72 hours, to determine the absorbance values and cytotoxicity grading, respectively. Meanwhile, the cells were subjected to osteogenic culture for 1 week, and ＜br> the alkaline phosphatase activities in two groups were detected. ＜br> RESULTS AND CONCLUSION:The prepared scaffold showed irregular micropores, high porosity, uniform pore distribution, high pore connectivity rate, and large compressive strength. The drug-loadedβ-tricalcium phosphate scaffold degraded completely with 15 weeks, and cancellous bone defect repair was completed in the same period. Rat bone marrow mesenchymal stem cells adhered to the surface of drug-loadedβ-tricalcium phosphate scaffold and went deep into the scaffold, showing good growth and proliferation. The activity of alkaline phosphatase was also improved. These findings indicate that the drug-loadedβ-tricalcium phosphate scaffold has good biocompatibility.

ObjectiveToobserve the killing effect of herpes simplex virus thymidine kinase/ganciclovir (HSV tk/GCV) suicide gene therapy system on human pancreatic carcinoma cell line. MethdsHSV tk gene was constructed into a retroviral vector pDOR neo. The recombinant plasmid pDOR tk neo was transfected into the retroviral packaging cell PA317. Finally HSV tk gene was transferred into human pancreatic cancer cell line PC 2. The sensitivity to GCV and bystander effect of PC 2/tk cells was tested in vitro. Antitumor effects were also observed after the administration of GCV in nude mice bearing tumor derived from PC 2/tk cells. ResultsHSV tk gene was successfully integrated into host cell. The killing effect of GCV on PC 2/tk cells was in a dose depandent and time depandent manners. The PC 2/tk cells showed a significant "bystander effect". Intraperitoneal injection of GCV postponed the formation of the implanted tumors. ConclusionPancreatic cancer cells expressing HSV tk can be effectively killed by GCV both in vitro and in vivo.

Based on the survey of the learning preference of Kunming Medical College students,we analyze relationship between students’learning style and personalities.In order to match different learning style,teachers must find some strategies in their English teaching.

[Objective]To study the dynamic changes of the VEGF and BMP-2 genes expressions inside the necrotic femoral head of rabbits.[Method]Made rabbit model of femoral head necrosis(FHN) with the method of twice intravenous injection with low dosage lipo polysaccharide(LPS)(10 ?g/kg body weight,at a time interval of 24 hours.)and 3 times intramuscular injection with methylprednisolone(MPS)(20mg/kg body weight,at a time interval of 24 hours.().)Immunohistochemistry,in situ hybridization and extract total RNA for real-time quantitative PCR were performed and successfully designed the suitable probes and primerswas used to detect the dynamic changes of the VEGF and BMP-2 genes expressions inside the femoral head of rabbits.[Result]The expressions of the VEGF and BMP-2 genes in group B(model group)at the 4,8,12 th and 16 th week were negative and real-time quantitative PCR showed that the level of the VEGF and BMP-2 mRNA genes expressions were obviously lower than that of control group.[Conclusion]The VEGF and BMP-2 genes expressions are inhibited in FNH model induced by LPS and MPS.

The simple and effective controlled needle devices were provided for acupuncture clinical trial so that the double blind acupuncture trial could be conducted possibly. The basic structure of filiform needle was modified. The needle handle was designed as hollow, the upper 1/3 of needle body as hollow and the lower 2/3 part as solid. The upper and lower parts were linked with an elastic unit. At the same time, the needle pad was attached. With this method, the new sham-acupuncture device was designed and developed. The new sham-acupuncture device could simulate needle insertion, manipulation and the techniques of reinforcing and reducing, without inserting into the human body. This innovation lays the foundation for perfecting the clinical randomized controlled blind trial of acupuncture.
Acupuncture Points ; Acupuncture Therapy ; instrumentation ; Equipment Design ; Needles

This paper explored and analyzed difficulties in English teaching and put forward some ways to deal with this situation.The suggestions included changing the curriculum from general English to medical English,establishing the multiple assessment system and developing multilingual teaching modes.

Objective Risk factor of radial and horizontal tear for posterior horn of medial meniscus is analyzed in present study.Methods A total of 390 patients diagnosed with medial meniscus tear received during January 2011 to December 2012 were of retrospective analysis.94 cases with radial tear of medial meniscus posterior horn and 95 horizontal cases were chosen as research objects.Age,gender,duration of symptoms,body weight index,trauma history,posterior slop of tibia plateau,knee valgus angle and Outerbridge cartilage classification of patients with radial or horizontal tear were recorded and analyzed.Multifactor unconditioned Logistic regression analysis was employed to analyze risk factor of meniscus radial tear.Results Significant difference could be spotted in the analysis of gender (x2=9.059,P=0.003),body weight index (t=2.549,P=0.012),knee valgus angle (t=-5.609,P=0.000) and Outerbridge cartilage classification (x2=42.300,P=0.000) between patients with radial or horizontal tear.Meanwhile,no significant difference could be spotted in the analysis of trauma history (x2=0.368,P=0.544),posterior slop of tibia plateau (x2=1.021,P=0.312),age (t=-1.228,P=0.221) and symptom duration (t=0.272,P=0.786).According to the results of multi-factor analysis,valgus angle (OR=12.581,P=0.001),age (OR=0.875,P=0.026) and Outerbridge cartilage classification (OR=33.790,P=0.000; OR=15.558,P=0.000; OR=39.891,P=0.000; OR=91.041,P=0.000) were risk factors of meniscus radial tear.Conclusion High incidence of posterior horn of medial meniscus tear was found in patients with senile osteoarthritis.The incidence of radial tear of medial meniscus posterior horn in elderly patients with knee varus or serious articular cartilage was higher than that of horizontal tear.

There are many factors which affect the effects of acetabular fracture treatment. According to the literature, they can be concluded as follows: First,factors before the injury, such as quality of bone, age, other diseases of the patient and the expectation of the patient for functional recovery; Secondly, injury related factors, such as type of fracture, presence or absence of complicated nerve injury, dislocation of the femoral head, soft tissue damage and other complications, and the degree of cartilage damage of the femoral head; Thirdly, operational factors, such as the time gap between trauma and surgery, accuracy of reduction, stability of the coxa after the operation, experience of the surgeon, selection of operative approach, conditions of the hospital and operative complications.

Objectives:To observe growth suppressive effects of human wild type p53(wt p53) gene on human esophageal cancer cell line. Methods:Using the retroviral vector to introduce exogenous wt p53 gene into human esophageal cancer cell line ECA109,the gene expression and tumor inhibition were studied in vitro and in vivo . Results:The expression of p53 in transfected cell lines(ECA 109/p53 ) was increased.The growth rates and the ability to form colony in soft agar were greatly inhibited in ECA 109/p53 cells versus ECA109/neo and ECA109 cells.The G 0+G 1 ratio increased and S ratio decreased in cell cycle distribution,and apoptosis index significantly rose in the ECA109/p53 cells,which were confirmed by FCM analyzing.The tumorigen icity of ECA109/p53 cells in nude mice was obviously suppressed by exogenous p53. Conclusions:Exogenous wt p53 mediated by retroviral vector could inhibit the growth of human esophageal cancer cell.